Changelog for restic 0.16.0 (2023-07-31)
=======================================

The following sections list the changes in restic 0.16.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #2565: Support "unlimited" in `forget --keep-*` options
 * Fix #3311: Support non-UTF8 paths as symlink target
 * Fix #4199: Avoid lock refresh issues on slow network connections
 * Fix #4274: Improve lock refresh handling after standby
 * Fix #4319: Correctly clean up status bar output of the `backup` command
 * Fix #4333: `generate` and `init` no longer silently ignore unexpected arguments
 * Fix #4400: Ignore missing folders in `rest` backend
 * Chg #4176: Fix JSON message type of `scan_finished` for the `backup` command
 * Chg #4201: Require Go 1.20 for Solaris builds
 * Enh #426: Show progress bar during restore
 * Enh #719: Add `--retry-lock` option
 * Enh #1495: Sort snapshots by timestamp in `restic find`
 * Enh #1759: Add `repair index` and `repair snapshots` commands
 * Enh #1926: Allow certificate paths to be passed through environment variables
 * Enh #2359: Provide multi-platform Docker images
 * Enh #2468: Add support for non-global Azure clouds
 * Enh #2679: Reduce file fragmentation for local backend
 * Enh #3328: Reduce memory usage by up to 25%
 * Enh #3397: Improve accuracy of ETA displayed during backup
 * Enh #3624: Keep oldest snapshot when there are not enough snapshots
 * Enh #3698: Add support for Managed / Workload Identity to `azure` backend
 * Enh #3871: Support `<snapshot>:<subfolder>` syntax to select subfolders
 * Enh #3941: Support `--group-by` for backup parent selection
 * Enh #4130: Cancel current command if cache becomes unusable
 * Enh #4159: Add `--human-readable` option to `ls` and `find` commands
 * Enh #4188: Include restic version in snapshot metadata
 * Enh #4220: Add `jq` binary to Docker image
 * Enh #4226: Allow specifying region of new buckets in the `gs` backend
 * Enh #4375: Add support for extended attributes on symlinks

Details
-------

 * Bugfix #2565: Support "unlimited" in `forget --keep-*` options

   Restic would previously forget snapshots that should have been kept when a negative value was
   passed to the `--keep-*` options. Negative values are now forbidden. To keep all snapshots,
   the special value `unlimited` is now supported. For example, `--keep-monthly unlimited`
   will keep all monthly snapshots.

   https://github.com/restic/restic/issues/2565
   https://github.com/restic/restic/pull/4234

 * Bugfix #3311: Support non-UTF8 paths as symlink target

   Earlier restic versions did not correctly `backup` and `restore` symlinks that contain a
   non-UTF8 target. Note that this only affected systems that still use a non-Unicode encoding
   for filesystem paths.

   The repository format is now extended to add support for such symlinks. Please note that
   snapshots must have been created with at least restic version 0.16.0 for `restore` to
   correctly handle non-UTF8 symlink targets when restoring them.

   https://github.com/restic/restic/issues/3311
   https://github.com/restic/restic/pull/3802

 * Bugfix #4199: Avoid lock refresh issues on slow network connections

   On network connections with a low upload speed, backups and other operations could fail with
   the error message `Fatal: failed to refresh lock in time`.

   This has now been fixed by reworking the lock refresh handling.

   https://github.com/restic/restic/issues/4199
   https://github.com/restic/restic/pull/4304

 * Bugfix #4274: Improve lock refresh handling after standby

   If the restic process was stopped or the host running restic entered standby during a long
   running operation such as a backup, this previously resulted in the operation failing with
   `Fatal: failed to refresh lock in time`.

   This has now been fixed such that restic first checks whether it is safe to continue the current
   operation and only throws an error if not.

   https://github.com/restic/restic/issues/4274
   https://github.com/restic/restic/pull/4374

 * Bugfix #4319: Correctly clean up status bar output of the `backup` command

   Due to a regression in restic 0.15.2, the status bar of the `backup` command could leave some
   output behind. This happened if filenames were printed that are wider than the current
   terminal width. This has now been fixed.

   https://github.com/restic/restic/issues/4319
   https://github.com/restic/restic/pull/4318

 * Bugfix #4333: `generate` and `init` no longer silently ignore unexpected arguments

   https://github.com/restic/restic/pull/4333

 * Bugfix #4400: Ignore missing folders in `rest` backend

   If a repository accessed via the REST backend was missing folders, then restic would fail with
   an error while trying to list the data in the repository. This has been now fixed.

   https://github.com/restic/rest-server/issues/235
   https://github.com/restic/restic/pull/4400

 * Change #4176: Fix JSON message type of `scan_finished` for the `backup` command

   Restic incorrectly set the `message_type` of the `scan_finished` message to `status`
   instead of `verbose_status`. This has now been corrected so that the messages report the
   correct type.

   https://github.com/restic/restic/pull/4176

 * Change #4201: Require Go 1.20 for Solaris builds

   Building restic on Solaris now requires Go 1.20, as the library used to access Azure uses the
   mmap syscall, which is only available on Solaris starting from Go 1.20. All other platforms
   however continue to build with Go 1.18.

   https://github.com/restic/restic/pull/4201

 * Enhancement #426: Show progress bar during restore

   The `restore` command now shows a progress report while restoring files.

   Example: `[0:42] 5.76% 23 files 12.98 MiB, total 3456 files 23.54 GiB`

   JSON output is now also supported.

   https://github.com/restic/restic/issues/426
   https://github.com/restic/restic/issues/3413
   https://github.com/restic/restic/issues/3627
   https://github.com/restic/restic/pull/3991
   https://github.com/restic/restic/pull/4314
   https://forum.restic.net/t/progress-bar-for-restore/5210

 * Enhancement #719: Add `--retry-lock` option

   This option allows specifying a duration for which restic will wait if the repository is
   already locked.

   https://github.com/restic/restic/issues/719
   https://github.com/restic/restic/pull/2214
   https://github.com/restic/restic/pull/4107

 * Enhancement #1495: Sort snapshots by timestamp in `restic find`

   The `find` command used to print snapshots in an arbitrary order. Restic now prints snapshots
   sorted by timestamp.

   https://github.com/restic/restic/issues/1495
   https://github.com/restic/restic/pull/4409

 * Enhancement #1759: Add `repair index` and `repair snapshots` commands

   The `rebuild-index` command has been renamed to `repair index`. The old name will still work,
   but is deprecated.

   When a snapshot was damaged, the only option up to now was to completely forget the snapshot,
   even if only some unimportant files in it were damaged and other files were still fine.

   Restic now has a `repair snapshots` command, which can salvage any non-damaged files and parts
   of files in the snapshots by removing damaged directories and missing file contents. Please
   note that the damaged data may still be lost and see the "Troubleshooting" section in the
   documentation for more details.

   https://github.com/restic/restic/issues/1759
   https://github.com/restic/restic/issues/1714
   https://github.com/restic/restic/issues/1798
   https://github.com/restic/restic/issues/2334
   https://github.com/restic/restic/pull/2876
   https://forum.restic.net/t/corrupted-repo-how-to-repair/799
   https://forum.restic.net/t/recovery-options-for-damaged-repositories/1571

 * Enhancement #1926: Allow certificate paths to be passed through environment variables

   Restic will now read paths to certificates from the environment variables `RESTIC_CACERT` or
   `RESTIC_TLS_CLIENT_CERT` if `--cacert` or `--tls-client-cert` are not specified.

   https://github.com/restic/restic/issues/1926
   https://github.com/restic/restic/pull/4384

 * Enhancement #2359: Provide multi-platform Docker images

   The official Docker images are now built for the architectures linux/386, linux/amd64,
   linux/arm and linux/arm64.

   As an alternative to the Docker Hub, the Docker images are also available on ghcr.io, the GitHub
   Container Registry.

   https://github.com/restic/restic/issues/2359
   https://github.com/restic/restic/issues/4269
   https://github.com/restic/restic/pull/4364

 * Enhancement #2468: Add support for non-global Azure clouds

   The `azure` backend previously only supported storages using the global domain
   `core.windows.net`. This meant that backups to other domains such as Azure China
   (`core.chinacloudapi.cn`) or Azure Germany (`core.cloudapi.de`) were not supported.
   Restic now allows overriding the global domain using the environment variable
   `AZURE_ENDPOINT_SUFFIX`.

   https://github.com/restic/restic/issues/2468
   https://github.com/restic/restic/pull/4387

 * Enhancement #2679: Reduce file fragmentation for local backend

   Before this change, local backend files could become fragmented. Now restic will try to
   preallocate space for pack files to avoid their fragmentation.

   https://github.com/restic/restic/issues/2679
   https://github.com/restic/restic/pull/3261

 * Enhancement #3328: Reduce memory usage by up to 25%

   The in-memory index has been optimized to be more garbage collection friendly. Restic now
   defaults to `GOGC=50` to run the Go garbage collector more frequently.

   https://github.com/restic/restic/issues/3328
   https://github.com/restic/restic/pull/4352
   https://github.com/restic/restic/pull/4353

 * Enhancement #3397: Improve accuracy of ETA displayed during backup

   Restic's `backup` command displayed an ETA that did not adapt when the rate of progress made
   during the backup changed during the course of the backup.

   Restic now uses recent progress when computing the ETA. It is important to realize that the
   estimate may still be wrong, because restic cannot predict the future, but the hope is that the
   ETA will be more accurate in most cases.

   https://github.com/restic/restic/issues/3397
   https://github.com/restic/restic/pull/3563

 * Enhancement #3624: Keep oldest snapshot when there are not enough snapshots

   The `forget` command now additionally preserves the oldest snapshot if fewer snapshots than
   allowed by the `--keep-*` parameters would otherwise be kept. This maximizes the amount of
   history kept within the specified limits.

   https://github.com/restic/restic/issues/3624
   https://github.com/restic/restic/pull/4366
   https://forum.restic.net/t/keeping-yearly-snapshots-policy-when-backup-began-during-the-year/4670/2

 * Enhancement #3698: Add support for Managed / Workload Identity to `azure` backend

   Restic now additionally supports authenticating to Azure using Workload Identity or Managed
   Identity credentials, which are automatically injected in several environments such as a
   managed Kubernetes cluster.

   https://github.com/restic/restic/issues/3698
   https://github.com/restic/restic/pull/4029

 * Enhancement #3871: Support `<snapshot>:<subfolder>` syntax to select subfolders

   Commands like `diff` or `restore` always worked with the full snapshot. This did not allow
   comparing only a specific subfolder or only restoring that folder (`restore --include
   subfolder` filters the restored files, but still creates the directories included in
   `subfolder`).

   The commands `diff`, `dump`, `ls` and `restore` now support the `<snapshot>:<subfolder>`
   syntax, where `snapshot` is the ID of a snapshot (or the string `latest`) and `subfolder` is a
   path within the snapshot. The commands will then only work with the specified path of the
   snapshot. The `subfolder` must be a path to a folder as returned by `ls`. Two examples:

   `restic restore -t target latest:/some/path` `restic diff 12345678:/some/path
   90abcef:/some/path`

   For debugging purposes, the `cat` command now supports `cat tree <snapshot>:<subfolder>` to
   return the directory metadata for the given subfolder.

   https://github.com/restic/restic/issues/3871
   https://github.com/restic/restic/pull/4334

 * Enhancement #3941: Support `--group-by` for backup parent selection

   Previously, the `backup` command by default selected the parent snapshot based on the
   hostname and the backup targets. When the backup path list changed, the `backup` command was
   unable to determine a suitable parent snapshot and had to read all files again.

   The new `--group-by` option for the `backup` command allows filtering snapshots for the
   parent selection by `host`, `paths` and `tags`. It defaults to `host,paths` which selects the
   latest snapshot with hostname and paths matching those of the backup run. This matches the
   behavior of prior restic versions.

   The new `--group-by` option should be set to the same value as passed to `forget --group-by`.

   https://github.com/restic/restic/issues/3941
   https://github.com/restic/restic/pull/4081

 * Enhancement #4130: Cancel current command if cache becomes unusable

   If the cache directory was removed or ran out of space while restic was running, this would
   previously cause further caching attempts to fail and thereby drastically slow down the
   command execution. Now, the currently running command is instead canceled.

   https://github.com/restic/restic/issues/4130
   https://github.com/restic/restic/pull/4166

 * Enhancement #4159: Add `--human-readable` option to `ls` and `find` commands

   Previously, when using the `-l` option with the `ls` and `find` commands, the displayed size
   was always in bytes, without an option for a more human readable format such as MiB or GiB.

   The new `--human-readable` option will convert longer size values into more human friendly
   values with an appropriate suffix depending on the output size. For example, a size of
   `14680064` will be shown as `14.000 MiB`.

   https://github.com/restic/restic/issues/4159
   https://github.com/restic/restic/pull/4351

 * Enhancement #4188: Include restic version in snapshot metadata

   The restic version used to backup a snapshot is now included in its metadata and shown when
   inspecting a snapshot using `restic cat snapshot <snapshotID>` or `restic snapshots
   --json`.

   https://github.com/restic/restic/issues/4188
   https://github.com/restic/restic/pull/4378

 * Enhancement #4220: Add `jq` binary to Docker image

   The Docker image now contains `jq`, which can be useful to process JSON data output by restic.

   https://github.com/restic/restic/pull/4220

 * Enhancement #4226: Allow specifying region of new buckets in the `gs` backend

   Previously, buckets used by the Google Cloud Storage backend would always get created in the
   "us" region. It is now possible to specify the region where a bucket should be created by using
   the `-o gs.region=us` option.

   https://github.com/restic/restic/pull/4226

 * Enhancement #4375: Add support for extended attributes on symlinks

   Restic now supports extended attributes on symlinks when backing up, restoring, or
   FUSE-mounting snapshots. This includes, for example, the `security.selinux` xattr on Linux
   distributions that use SELinux.

   https://github.com/restic/restic/issues/4375
   https://github.com/restic/restic/pull/4379


Changelog for restic 0.15.2 (2023-04-24)
=======================================

The following sections list the changes in restic 0.15.2 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Sec #4275: Update golang.org/x/net to address CVE-2022-41723
 * Fix #2260: Sanitize filenames printed by `backup` during processing
 * Fix #4211: Make `dump` interpret `--host` and `--path` correctly
 * Fix #4239: Correct number of blocks reported in mount point
 * Fix #4253: Minimize risk of spurious filesystem loops with `mount`
 * Enh #4180: Add release binaries for riscv64 architecture on Linux
 * Enh #4219: Upgrade Minio to version 7.0.49

Details
-------

 * Security #4275: Update golang.org/x/net to address CVE-2022-41723

   https://github.com/restic/restic/issues/4275
   https://github.com/restic/restic/pull/4213

 * Bugfix #2260: Sanitize filenames printed by `backup` during processing

   The `backup` command would previously not sanitize the filenames it printed during
   processing, potentially causing newlines or terminal control characters to mangle the
   status output or even change the state of a terminal.

   Filenames are now checked and quoted if they contain non-printable or non-Unicode
   characters.

   https://github.com/restic/restic/issues/2260
   https://github.com/restic/restic/issues/4191
   https://github.com/restic/restic/pull/4192

 * Bugfix #4211: Make `dump` interpret `--host` and `--path` correctly

   A regression in restic 0.15.0 caused `dump` to confuse its `--host=<host>` and
   `--path=<path>` options: it looked for snapshots with paths called `<host>` from hosts
   called `<path>`. It now treats the options as intended.

   https://github.com/restic/restic/issues/4211
   https://github.com/restic/restic/pull/4212

 * Bugfix #4239: Correct number of blocks reported in mount point

   Restic mount points reported an incorrect number of 512-byte (POSIX standard) blocks for
   files and links due to a rounding bug. In particular, empty files were reported as taking one
   block instead of zero.

   The rounding is now fixed: the number of blocks reported is the file size (or link target size)
   divided by 512 and rounded up to a whole number.

   https://github.com/restic/restic/issues/4239
   https://github.com/restic/restic/pull/4240

 * Bugfix #4253: Minimize risk of spurious filesystem loops with `mount`

   When a backup contains a directory that has the same name as its parent, say `a/b/b`, and the GNU
   `find` command was run on this backup in a restic mount, `find` would refuse to traverse the
   lowest `b` directory, instead printing `File system loop detected`. This was due to the way the
   restic mount command generates inode numbers for directories in the mount point.

   The rule for generating these inode numbers was changed in 0.15.0. It has now been changed again
   to avoid this issue. A perfect rule does not exist, but the probability of this behavior
   occurring is now extremely small.

   When it does occur, the mount point is not broken, and scripts that traverse the mount point
   should work as long as they don't rely on inode numbers for detecting filesystem loops.

   https://github.com/restic/restic/issues/4253
   https://github.com/restic/restic/pull/4255

 * Enhancement #4180: Add release binaries for riscv64 architecture on Linux

   Builds for the `riscv64` architecture on Linux are now included in the release binaries.

   https://github.com/restic/restic/pull/4180

 * Enhancement #4219: Upgrade Minio to version 7.0.49

   The upgraded version now allows use of the `ap-southeast-4` region (Melbourne).

   https://github.com/restic/restic/pull/4219


Changelog for restic 0.15.1 (2023-01-30)
=======================================

The following sections list the changes in restic 0.15.1 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #3750: Remove `b2_download_file_by_name: 404` warning from B2 backend
 * Fix #4147: Make `prune --quiet` not print progress bar
 * Fix #4163: Make `self-update --output` work with new filename on Windows
 * Fix #4167: Add missing ETA in `backup` progress bar
 * Enh #4143: Ignore empty lock files

Details
-------

 * Bugfix #3750: Remove `b2_download_file_by_name: 404` warning from B2 backend

   In some cases the B2 backend could print `b2_download_file_by_name: 404: : b2.b2err`
   warnings. These are only debug messages and can be safely ignored.

   Restic now uses an updated library for accessing B2, which removes the warning.

   https://github.com/restic/restic/issues/3750
   https://github.com/restic/restic/issues/4144
   https://github.com/restic/restic/pull/4146

 * Bugfix #4147: Make `prune --quiet` not print progress bar

   A regression in restic 0.15.0 caused `prune --quiet` to show a progress bar while deciding how
   to process each pack files. This has now been fixed.

   https://github.com/restic/restic/issues/4147
   https://github.com/restic/restic/pull/4153

 * Bugfix #4163: Make `self-update --output` work with new filename on Windows

   Since restic 0.14.0 the `self-update` command did not work when a custom output filename was
   specified via the `--output` option. This has now been fixed.

   As a workaround, either use an older restic version to run the self-update or create an empty
   file with the output filename before updating e.g. using CMD:

   `type nul > new-file.exe` `restic self-update --output new-file.exe`

   https://github.com/restic/restic/pull/4163
   https://forum.restic.net/t/self-update-windows-started-failing-after-release-of-0-15/5836

 * Bugfix #4167: Add missing ETA in `backup` progress bar

   A regression in restic 0.15.0 caused the ETA to be missing from the progress bar displayed by the
   `backup` command. This has now been fixed.

   https://github.com/restic/restic/pull/4167

 * Enhancement #4143: Ignore empty lock files

   With restic 0.15.0 the checks for stale locks became much stricter than before. In particular,
   empty or unreadable locks were no longer silently ignored. This made restic to complain with
   `Load(<lock/1234567812>, 0, 0) returned error, retrying after 552.330144ms:
   load(<lock/1234567812>): invalid data returned` and fail in the end.

   The error message is now clarified and the implementation changed to ignore empty lock files
   which are sometimes created as the result of a failed uploads on some backends.

   Please note that unreadable lock files still have to cleaned up manually. To do so, you can run
   `restic unlock --remove-all` which removes all existing lock files. But first make sure that
   no other restic process is currently using the repository.

   https://github.com/restic/restic/issues/4143
   https://github.com/restic/restic/pull/4152


Changelog for restic 0.15.0 (2023-01-12)
=======================================

The following sections list the changes in restic 0.15.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #2015: Make `mount` return exit code 0 after receiving Ctrl-C / SIGINT
 * Fix #2578: Make `restore` replace existing symlinks
 * Fix #2591: Don't read password from stdin for `backup --stdin`
 * Fix #3161: Delete files on Backblaze B2 more reliably
 * Fix #3336: Make SFTP backend report no space left on device
 * Fix #3567: Improve handling of interrupted syscalls in `mount` command
 * Fix #3897: Fix stuck `copy` command when `-o <backend>.connections=1`
 * Fix #3918: Correct prune statistics for partially compressed repositories
 * Fix #3951: Make `ls` return exit code 1 if snapshot cannot be loaded
 * Fix #4003: Make `backup` no longer hang on Solaris when seeing a FIFO file
 * Fix #4016: Support ExFAT-formatted local backends on macOS Ventura
 * Fix #4085: Make `init` ignore "Access Denied" errors when creating S3 buckets
 * Fix #4100: Make `self-update` enabled by default only in release builds
 * Fix #4103: Don't generate negative UIDs and GIDs in tar files from `dump`
 * Chg #2724: Include full snapshot ID in JSON output of `backup`
 * Chg #3929: Make `unlock` display message only when locks were actually removed
 * Chg #4033: Don't print skipped snapshots by default in `copy` command
 * Chg #4041: Update dependencies and require Go 1.18 or newer
 * Enh #14: Implement `rewrite` command
 * Enh #79: Restore files with long runs of zeros as sparse files
 * Enh #1078: Support restoring symbolic links on Windows
 * Enh #1734: Inform about successful retries after errors
 * Enh #1866: Improve handling of directories with duplicate entries
 * Enh #2134: Support B2 API keys restricted to hiding but not deleting files
 * Enh #2152: Make `init` open only one connection for the SFTP backend
 * Enh #2533: Handle cache corruption on disk and in downloads
 * Enh #2715: Stricter repository lock handling
 * Enh #2750: Make backup file read concurrency configurable
 * Enh #3029: Add support for `credential_process` to S3 backend
 * Enh #3096: Make `mount` command support macOS using macFUSE 4.x
 * Enh #3124: Support JSON output for the `init` command
 * Enh #3899: Optimize prune memory usage
 * Enh #3905: Improve speed of parent snapshot detection in `backup` command
 * Enh #3915: Add compression statistics to the `stats` command
 * Enh #3925: Provide command completion for PowerShell
 * Enh #3931: Allow `backup` file tree scanner to be disabled
 * Enh #3932: Improve handling of ErrDot errors in rclone and sftp backends
 * Enh #3943: Ignore additional/unknown files in repository
 * Enh #3955: Improve `backup` performance for small files

Details
-------

 * Bugfix #2015: Make `mount` return exit code 0 after receiving Ctrl-C / SIGINT

   To stop the `mount` command, a user has to press Ctrl-C or send a SIGINT signal to restic. This
   used to cause restic to exit with a non-zero exit code.

   The exit code has now been changed to zero as the above is the expected way to stop the `mount`
   command and should therefore be considered successful.

   https://github.com/restic/restic/issues/2015
   https://github.com/restic/restic/pull/3894

 * Bugfix #2578: Make `restore` replace existing symlinks

   When restoring a symlink, restic used to report an error if the target path already existed.
   This has now been fixed such that the potentially existing target path is first removed before
   the symlink is restored.

   https://github.com/restic/restic/issues/2578
   https://github.com/restic/restic/pull/3780

 * Bugfix #2591: Don't read password from stdin for `backup --stdin`

   The `backup` command when used with `--stdin` previously tried to read first the password,
   then the data to be backed up from standard input. This meant it would often confuse part of the
   data for the password.

   From now on, it will instead exit with the message `Fatal: cannot read both password and data
   from stdin` unless the password is passed in some other way (such as
   `--restic-password-file`, `RESTIC_PASSWORD`, etc).

   To enter the password interactively a password command has to be used. For example on Linux,
   `mysqldump somedatabase | restic backup --stdin --password-command='sh -c
   "systemd-ask-password < /dev/tty"'` securely reads the password from the terminal.

   https://github.com/restic/restic/issues/2591
   https://github.com/restic/restic/pull/4011

 * Bugfix #3161: Delete files on Backblaze B2 more reliably

   Restic used to only delete the latest version of files stored in B2. In most cases this worked
   well as there was only a single version of the file. However, due to retries while uploading it is
   possible for multiple file versions to be stored at B2. This could lead to various problems for
   files that should have been deleted but still existed.

   The implementation has now been changed to delete all versions of files, which doubles the
   amount of Class B transactions necessary to delete files, but assures that no file versions are
   left behind.

   https://github.com/restic/restic/issues/3161
   https://github.com/restic/restic/pull/3885

 * Bugfix #3336: Make SFTP backend report no space left on device

   Backing up to an SFTP backend would spew repeated SSH_FX_FAILURE messages when the remote disk
   was full. Restic now reports "sftp: no space left on device" and exits immediately when it
   detects this condition.

   A fix for this issue was implemented in restic 0.12.1, but unfortunately the fix itself
   contained a bug that prevented it from taking effect.

   https://github.com/restic/restic/issues/3336
   https://github.com/restic/restic/pull/3345
   https://github.com/restic/restic/pull/4075

 * Bugfix #3567: Improve handling of interrupted syscalls in `mount` command

   Accessing restic's FUSE mount could result in "input/output" errors when using programs in
   which syscalls can be interrupted. This is for example the case for Go programs. This has now
   been fixed by improved error handling of interrupted syscalls.

   https://github.com/restic/restic/issues/3567
   https://github.com/restic/restic/issues/3694
   https://github.com/restic/restic/pull/3875

 * Bugfix #3897: Fix stuck `copy` command when `-o <backend>.connections=1`

   When running the `copy` command with `-o <backend>.connections=1` the command would be
   infinitely stuck. This has now been fixed.

   https://github.com/restic/restic/issues/3897
   https://github.com/restic/restic/pull/3898

 * Bugfix #3918: Correct prune statistics for partially compressed repositories

   In a partially compressed repository, one data blob can exist both in an uncompressed and a
   compressed version. This caused the `prune` statistics to become inaccurate and e.g. report a
   too high value for the unused size, such as "unused size after prune: 16777215.991 TiB". This
   has now been fixed.

   https://github.com/restic/restic/issues/3918
   https://github.com/restic/restic/pull/3980

 * Bugfix #3951: Make `ls` return exit code 1 if snapshot cannot be loaded

   The `ls` command used to show a warning and return exit code 0 when failing to load a snapshot.
   This has now been fixed such that it instead returns exit code 1 (still showing a warning).

   https://github.com/restic/restic/pull/3951

 * Bugfix #4003: Make `backup` no longer hang on Solaris when seeing a FIFO file

   The `backup` command used to hang on Solaris whenever it encountered a FIFO file (named pipe),
   due to a bug in the handling of extended attributes. This bug has now been fixed.

   https://github.com/restic/restic/issues/4003
   https://github.com/restic/restic/pull/4053

 * Bugfix #4016: Support ExFAT-formatted local backends on macOS Ventura

   ExFAT-formatted disks could not be used as local backends starting from macOS Ventura. Restic
   commands would fail with an "inappropriate ioctl for device" error. This has now been fixed.

   https://github.com/restic/restic/issues/4016
   https://github.com/restic/restic/pull/4021

 * Bugfix #4085: Make `init` ignore "Access Denied" errors when creating S3 buckets

   In restic 0.9.0 through 0.13.0, the `init` command ignored some permission errors from S3
   backends when trying to check for bucket existence, so that manually created buckets with
   custom permissions could be used for backups.

   This feature became broken in 0.14.0, but has now been restored again.

   https://github.com/restic/restic/issues/4085
   https://github.com/restic/restic/pull/4086

 * Bugfix #4100: Make `self-update` enabled by default only in release builds

   The `self-update` command was previously included by default in all builds of restic as
   opposed to only in official release builds, even if the `selfupdate` tag was not explicitly
   enabled when building.

   This has now been corrected, and the `self-update` command is only available if restic was
   built with `-tags selfupdate` (as done for official release builds by `build.go`).

   https://github.com/restic/restic/pull/4100

 * Bugfix #4103: Don't generate negative UIDs and GIDs in tar files from `dump`

   When using a 32-bit build of restic, the `dump` command could in some cases create tar files
   containing negative UIDs and GIDs, which cannot be read by GNU tar. This corner case especially
   applies to backups from stdin on Windows.

   This is now fixed such that `dump` creates valid tar files in these cases too.

   https://github.com/restic/restic/issues/4103
   https://github.com/restic/restic/pull/4104

 * Change #2724: Include full snapshot ID in JSON output of `backup`

   We have changed the JSON output of the backup command to include the full snapshot ID instead of
   just a shortened version, as the latter can be ambiguous in some rare cases. To derive the short
   ID, please truncate the full ID down to eight characters.

   https://github.com/restic/restic/issues/2724
   https://github.com/restic/restic/pull/3993

 * Change #3929: Make `unlock` display message only when locks were actually removed

   The `unlock` command used to print the "successfully removed locks" message whenever it was
   run, regardless of lock files having being removed or not.

   This has now been changed such that it only prints the message if any lock files were actually
   removed. In addition, it also reports the number of removed lock files.

   https://github.com/restic/restic/issues/3929
   https://github.com/restic/restic/pull/3935

 * Change #4033: Don't print skipped snapshots by default in `copy` command

   The `copy` command used to print each snapshot that was skipped because it already existed in
   the target repository. The amount of this output could practically bury the list of snapshots
   that were actually copied.

   From now on, the skipped snapshots are by default not printed at all, but this can be re-enabled
   by increasing the verbosity level of the command.

   https://github.com/restic/restic/issues/4033
   https://github.com/restic/restic/pull/4066

 * Change #4041: Update dependencies and require Go 1.18 or newer

   Most dependencies have been updated. Since some libraries require newer language features,
   support for Go 1.15-1.17 has been dropped, which means that restic now requires at least Go 1.18
   to build.

   https://github.com/restic/restic/pull/4041

 * Enhancement #14: Implement `rewrite` command

   Restic now has a `rewrite` command which allows to rewrite existing snapshots to remove
   unwanted files.

   https://github.com/restic/restic/issues/14
   https://github.com/restic/restic/pull/2731
   https://github.com/restic/restic/pull/4079

 * Enhancement #79: Restore files with long runs of zeros as sparse files

   When using `restore --sparse`, the restorer may now write files containing long runs of zeros
   as sparse files (also called files with holes), where the zeros are not actually written to
   disk.

   How much space is saved by writing sparse files depends on the operating system, file system and
   the distribution of zeros in the file.

   During backup restic still reads the whole file including sparse regions, but with optimized
   processing speed of sparse regions.

   https://github.com/restic/restic/issues/79
   https://github.com/restic/restic/issues/3903
   https://github.com/restic/restic/pull/2601
   https://github.com/restic/restic/pull/3854
   https://forum.restic.net/t/sparse-file-support/1264

 * Enhancement #1078: Support restoring symbolic links on Windows

   The `restore` command now supports restoring symbolic links on Windows. Because of Windows
   specific restrictions this is only possible when running restic with the
   `SeCreateSymbolicLinkPrivilege` privilege or as an administrator.

   https://github.com/restic/restic/issues/1078
   https://github.com/restic/restic/issues/2699
   https://github.com/restic/restic/pull/2875

 * Enhancement #1734: Inform about successful retries after errors

   When a recoverable error is encountered, restic shows a warning message saying that it's
   retrying, e.g.:

   `Save(<data/956b9ced99>) returned error, retrying after 357.131936ms: ...`

   This message can be confusing in that it never clearly states whether the retry is successful or
   not. This has now been fixed such that restic follows up with a message confirming a successful
   retry, e.g.:

   `Save(<data/956b9ced99>) operation successful after 1 retries`

   https://github.com/restic/restic/issues/1734
   https://github.com/restic/restic/pull/2661

 * Enhancement #1866: Improve handling of directories with duplicate entries

   If for some reason a directory contains a duplicate entry, the `backup` command would
   previously fail with a `node "path/to/file" already present` or `nodes are not ordered got
   "path/to/file", last "path/to/file"` error.

   The error handling has been improved to only report a warning in this case. Make sure to check
   that the filesystem in question is not damaged if you see this!

   https://github.com/restic/restic/issues/1866
   https://github.com/restic/restic/issues/3937
   https://github.com/restic/restic/pull/3880

 * Enhancement #2134: Support B2 API keys restricted to hiding but not deleting files

   When the B2 backend does not have the necessary permissions to permanently delete files, it now
   automatically falls back to hiding files. This allows using restic with an application key
   which is not allowed to delete files. This can prevent an attacker from deleting backups with
   such an API key.

   To use this feature create an application key without the `deleteFiles` capability. It is
   recommended to restrict the key to just one bucket. For example using the `b2` command line
   tool:

   `b2 create-key --bucket <bucketName> <keyName>
   listBuckets,readFiles,writeFiles,listFiles`

   Alternatively, you can use the S3 backend to access B2, as described in the documentation. In
   this mode, files are also only hidden instead of being deleted permanently.

   https://github.com/restic/restic/issues/2134
   https://github.com/restic/restic/pull/2398

 * Enhancement #2152: Make `init` open only one connection for the SFTP backend

   The `init` command using the SFTP backend used to connect twice to the repository. This could be
   inconvenient if the user must enter a password, or cause `init` to fail if the server does not
   correctly close the first SFTP connection.

   This has now been fixed by reusing the first/initial SFTP connection opened.

   https://github.com/restic/restic/issues/2152
   https://github.com/restic/restic/pull/3882

 * Enhancement #2533: Handle cache corruption on disk and in downloads

   In rare situations, like for example after a system crash, the data stored in the cache might be
   corrupted. This could cause restic to fail and required manually deleting the cache.

   Restic now automatically removes broken data from the cache, allowing it to recover from such a
   situation without user intervention. In addition, restic retries downloads which return
   corrupt data in order to also handle temporary download problems.

   https://github.com/restic/restic/issues/2533
   https://github.com/restic/restic/pull/3521

 * Enhancement #2715: Stricter repository lock handling

   Previously, restic commands kept running even if they failed to refresh their locks in time.
   This could be a problem e.g. in case the client system running a backup entered the standby power
   mode while the backup was still in progress (which would prevent the client from refreshing its
   lock), and after a short delay another host successfully runs `unlock` and `prune` on the
   repository, which would remove all data added by the in-progress backup. If the backup client
   later continues its backup, even though its lock had expired in the meantime, this would lead to
   an incomplete snapshot.

   To address this, lock handling is now much stricter. Commands requiring a lock are canceled if
   the lock is not refreshed successfully in time. In addition, if a lock file is not readable
   restic will not allow starting a command. It may be necessary to remove invalid lock files
   manually or use `unlock --remove-all`. Please make sure that no other restic processes are
   running concurrently before doing this, however.

   https://github.com/restic/restic/issues/2715
   https://github.com/restic/restic/pull/3569

 * Enhancement #2750: Make backup file read concurrency configurable

   The `backup` command now supports a `--read-concurrency` option which allows tuning restic
   for very fast storage like NVMe disks by controlling the number of concurrent file reads during
   the backup process.

   https://github.com/restic/restic/pull/2750

 * Enhancement #3029: Add support for `credential_process` to S3 backend

   Restic now uses a newer library for the S3 backend, which adds support for the
   `credential_process` option in the AWS credential configuration.

   https://github.com/restic/restic/issues/3029
   https://github.com/restic/restic/issues/4034
   https://github.com/restic/restic/pull/4025

 * Enhancement #3096: Make `mount` command support macOS using macFUSE 4.x

   Restic now uses a different FUSE library for mounting snapshots and making them available as a
   FUSE filesystem using the `mount` command. This adds support for macFUSE 4.x which can be used
   to make this work on recent macOS versions.

   https://github.com/restic/restic/issues/3096
   https://github.com/restic/restic/pull/4024

 * Enhancement #3124: Support JSON output for the `init` command

   The `init` command used to ignore the `--json` option, but now outputs a JSON message if the
   repository was created successfully.

   https://github.com/restic/restic/issues/3124
   https://github.com/restic/restic/pull/3132

 * Enhancement #3899: Optimize prune memory usage

   The `prune` command needs large amounts of memory in order to determine what to keep and what to
   remove. This is now optimized to use up to 30% less memory.

   https://github.com/restic/restic/pull/3899

 * Enhancement #3905: Improve speed of parent snapshot detection in `backup` command

   Backing up a large number of files using `--files-from-verbatim` or `--files-from-raw`
   options could require a long time to find the parent snapshot. This has been improved.

   https://github.com/restic/restic/pull/3905

 * Enhancement #3915: Add compression statistics to the `stats` command

   When executed with `--mode raw-data` on a repository that supports compression, the `stats`
   command now calculates and displays, for the selected repository or snapshots: the
   uncompressed size of the data; the compression progress (percentage of data that has been
   compressed); the compression ratio of the compressed data; the total space saving.

   It also takes into account both the compressed and uncompressed data if the repository is only
   partially compressed.

   https://github.com/restic/restic/pull/3915

 * Enhancement #3925: Provide command completion for PowerShell

   Restic already provided generation of completion files for bash, fish and zsh. Now powershell
   is supported, too.

   https://github.com/restic/restic/pull/3925/files

 * Enhancement #3931: Allow `backup` file tree scanner to be disabled

   The `backup` command walks the file tree in a separate scanner process to find the total size and
   file/directory count, and uses this to provide an ETA. This can slow down backups, especially
   of network filesystems.

   The command now has a new option `--no-scan` which can be used to disable this scanning in order
   to speed up backups when needed.

   https://github.com/restic/restic/pull/3931

 * Enhancement #3932: Improve handling of ErrDot errors in rclone and sftp backends

   Since Go 1.19, restic can no longer implicitly run relative executables which are found in the
   current directory (e.g. `rclone` if found in `.`). This is a security feature of Go to prevent
   against running unintended and possibly harmful executables.

   The error message for this was just "cannot run executable found relative to current
   directory". This has now been improved to yield a more specific error message, informing the
   user how to explicitly allow running the executable using the `-o rclone.program` and `-o
   sftp.command` extended options with `./`.

   https://github.com/restic/restic/issues/3932
   https://pkg.go.dev/os/exec#hdr-Executables_in_the_current_directory
   https://go.dev/blog/path-security

 * Enhancement #3943: Ignore additional/unknown files in repository

   If a restic repository had additional files in it (not created by restic), commands like `find`
   and `restore` could become confused and fail with an `multiple IDs with prefix "12345678"
   found` error. These commands now ignore such additional files.

   https://github.com/restic/restic/pull/3943
   https://forum.restic.net/t/which-protocol-should-i-choose-for-remote-linux-backups/5446/17

 * Enhancement #3955: Improve `backup` performance for small files

   When backing up small files restic was slower than it could be. In particular this affected
   backups using maximum compression.

   This has been fixed by reworking the internal parallelism of the backup command, making it back
   up small files around two times faster.

   https://github.com/restic/restic/pull/3955


Changelog for restic 0.14.0 (2022-08-25)
=======================================

The following sections list the changes in restic 0.14.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #2248: Support `self-update` on Windows
 * Fix #3428: List snapshots in backend at most once to resolve snapshot IDs
 * Fix #3432: Fix rare 'not found in repository' error for `copy` command
 * Fix #3681: Fix rclone (shimmed by Scoop) and sftp not working on Windows
 * Fix #3685: The `diff` command incorrectly listed some files as added
 * Fix #3716: Print "wrong password" to stderr instead of stdout
 * Fix #3720: Directory sync errors for repositories accessed via SMB
 * Fix #3736: The `stats` command miscalculated restore size for multiple snapshots
 * Fix #3772: Correctly rebuild index for legacy repositories
 * Fix #3776: Limit number of key files tested while opening a repository
 * Fix #3861: Yield error on invalid policy to `forget`
 * Chg #1842: Support debug log creation in release builds
 * Chg #3295: Deprecate `check --check-unused` and add further checks
 * Chg #3680: Update dependencies and require Go 1.15 or newer
 * Chg #3742: Replace `--repo2` option used by `init`/`copy` with `--from-repo`
 * Enh #21: Add compression support
 * Enh #1153: Support pruning even when the disk is full
 * Enh #2162: Adaptive IO concurrency based on backend connections
 * Enh #2291: Allow pack size customization
 * Enh #2295: Allow use of SAS token to authenticate to Azure
 * Enh #2351: Use config file permissions to control file group access
 * Enh #2696: Improve backup speed with many small files
 * Enh #2907: Make snapshot directory structure of `mount` command customizable
 * Enh #2923: Improve speed of `copy` command
 * Enh #3114: Optimize handling of duplicate blobs in `prune`
 * Enh #3465: Improve handling of temporary files on Windows
 * Enh #3475: Allow limiting IO concurrency for local and SFTP backend
 * Enh #3484: Stream data in `check` and `prune` commands
 * Enh #3709: Validate exclude patterns before backing up
 * Enh #3729: Display full IDs in `check` warnings
 * Enh #3773: Optimize memory usage for directories with many files
 * Enh #3819: Validate include/exclude patterns before restoring
 * Enh #3837: Improve SFTP repository initialization over slow links

Details
-------

 * Bugfix #2248: Support `self-update` on Windows

   Restic `self-update` would fail in situations where the operating system locks running
   binaries, including Windows. The new behavior works around this by renaming the running file
   and swapping the updated file in place.

   https://github.com/restic/restic/issues/2248
   https://github.com/restic/restic/pull/3675

 * Bugfix #3428: List snapshots in backend at most once to resolve snapshot IDs

   Many commands support specifying a list of snapshot IDs which are then used to determine the
   snapshots to be processed by the command. To resolve snapshot IDs or `latest`, and check that
   these exist, restic previously listed all snapshots stored in the repository. Depending on
   the backend this could be a slow and/or expensive operation.

   Restic now lists the snapshots only once and remembers the result in order to resolve all
   further snapshot IDs swiftly.

   https://github.com/restic/restic/issues/3428
   https://github.com/restic/restic/pull/3570
   https://github.com/restic/restic/pull/3395

 * Bugfix #3432: Fix rare 'not found in repository' error for `copy` command

   In rare cases `copy` (and other commands) would report that `LoadTree(...)` returned an `id
   [...] not found in repository` error. This could be caused by a backup or copy command running
   concurrently. The error was only temporary; running the failed restic command a second time as
   a workaround did resolve the error.

   This issue has now been fixed by correcting the order in which restic reads data from the
   repository. It is now guaranteed that restic only loads snapshots for which all necessary data
   is already available.

   https://github.com/restic/restic/issues/3432
   https://github.com/restic/restic/pull/3570

 * Bugfix #3681: Fix rclone (shimmed by Scoop) and sftp not working on Windows

   In #3602 a fix was introduced to address the problem of `rclone` prematurely exiting when
   Ctrl+C is pressed on Windows. The solution was to create the subprocess with its console
   detached from the restic console.

   However, this solution failed when using `rclone` installed by Scoop or using `sftp` with a
   passphrase-protected private key. We've now fixed this by using a different approach to
   prevent Ctrl-C from passing down too early.

   https://github.com/restic/restic/issues/3681
   https://github.com/restic/restic/issues/3692
   https://github.com/restic/restic/pull/3696

 * Bugfix #3685: The `diff` command incorrectly listed some files as added

   There was a bug in the `diff` command, causing it to always show files in a removed directory as
   added. This has now been fixed.

   https://github.com/restic/restic/issues/3685
   https://github.com/restic/restic/pull/3686

 * Bugfix #3716: Print "wrong password" to stderr instead of stdout

   If an invalid password was entered, the error message was printed on stdout and not on stderr as
   intended. This has now been fixed.

   https://github.com/restic/restic/pull/3716
   https://forum.restic.net/t/4965

 * Bugfix #3720: Directory sync errors for repositories accessed via SMB

   On Linux and macOS, accessing a repository via a SMB/CIFS mount resulted in restic failing to
   save the lock file, yielding the following errors:

   Save(<lock/071fe833f0>) returned error, retrying after 552.330144ms: sync /repo/locks:
   no such file or directory Save(<lock/bf789d7343>) returned error, retrying after
   552.330144ms: sync /repo/locks: invalid argument

   This has now been fixed by ignoring the relevant error codes.

   https://github.com/restic/restic/issues/3720
   https://github.com/restic/restic/issues/3751
   https://github.com/restic/restic/pull/3752

 * Bugfix #3736: The `stats` command miscalculated restore size for multiple snapshots

   Since restic 0.10.0 the restore size calculated by the `stats` command for multiple snapshots
   was too low. The hardlink detection was accidentally applied across multiple snapshots and
   thus ignored many files. This has now been fixed.

   https://github.com/restic/restic/issues/3736
   https://github.com/restic/restic/pull/3740

 * Bugfix #3772: Correctly rebuild index for legacy repositories

   After running `rebuild-index` on a legacy repository containing mixed pack files (that is,
   pack files which store both metadata and file data), `check` printed warnings like `pack
   12345678 contained in several indexes: ...`. This warning was not critical, but has now
   nonetheless been fixed by properly handling mixed pack files while rebuilding the index.

   Running `prune` for such legacy repositories will also fix the warning by reorganizing the
   pack files which caused it.

   https://github.com/restic/restic/pull/3772
   https://github.com/restic/restic/pull/3884
   https://forum.restic.net/t/5044/13

 * Bugfix #3776: Limit number of key files tested while opening a repository

   Previously, restic tested the password against every key in the repository when opening a
   repository. The more keys there were in the repository, the slower this operation became.

   Restic now tests the password against up to 20 key files in the repository. Alternatively, you
   can use the `--key-hint=<key ID>` option to specify a specific key file to use instead.

   https://github.com/restic/restic/pull/3776

 * Bugfix #3861: Yield error on invalid policy to `forget`

   The `forget` command previously silently ignored invalid/unsupported units in the duration
   options, such as e.g. `--keep-within-daily 2w`.

   Specifying an invalid/unsupported duration unit now results in an error.

   https://github.com/restic/restic/issues/3861
   https://github.com/restic/restic/pull/3862

 * Change #1842: Support debug log creation in release builds

   Creating a debug log was only possible in debug builds which required users to manually build
   restic. We changed the release builds to allow creating debug logs by simply setting the
   environment variable `DEBUG_LOG=logname.log`.

   https://github.com/restic/restic/issues/1842
   https://github.com/restic/restic/pull/3826

 * Change #3295: Deprecate `check --check-unused` and add further checks

   Since restic 0.12.0, it is expected to still have unused blobs after running `prune`. This made
   the `--check-unused` option of the `check` command rather useless and tended to confuse
   users. This option has been deprecated and is now ignored.

   The `check` command now also warns if a repository is using either the legacy S3 layout or mixed
   pack files with both tree and data blobs. The latter is known to cause performance problems.

   https://github.com/restic/restic/issues/3295
   https://github.com/restic/restic/pull/3730

 * Change #3680: Update dependencies and require Go 1.15 or newer

   We've updated most dependencies. Since some libraries require newer language features we're
   dropping support for Go 1.14, which means that restic now requires at least Go 1.15 to build.

   https://github.com/restic/restic/issues/3680
   https://github.com/restic/restic/issues/3883

 * Change #3742: Replace `--repo2` option used by `init`/`copy` with `--from-repo`

   The `init` and `copy` commands can read data from another repository. However, confusingly
   `--repo2` referred to the repository *from* which the `init` command copies parameters, but
   for the `copy` command `--repo2` referred to the copy *destination*.

   We've introduced a new option, `--from-repo`, which always refers to the source repository
   for both commands. The old parameter names have been deprecated but still work. To create a new
   repository and copy all snapshots to it, the commands are now as follows:

   ``` restic -r /srv/restic-repo-copy init --from-repo /srv/restic-repo
   --copy-chunker-params restic -r /srv/restic-repo-copy copy --from-repo
   /srv/restic-repo ```

   https://github.com/restic/restic/pull/3742
   https://forum.restic.net/t/5017

 * Enhancement #21: Add compression support

   We've added compression support to the restic repository format. To create a repository using
   the new format run `init --repository-version 2`. Please note that the repository cannot be
   read by restic versions prior to 0.14.0.

   You can configure whether data is compressed with the option `--compression`. It can be set to
   `auto` (the default, which will compress very fast), `max` (which will trade backup speed and
   CPU usage for better compression), or `off` (which disables compression). Each setting is
   only applied for the current run of restic and does *not* apply to future runs. The option can
   also be set via the environment variable `RESTIC_COMPRESSION`.

   To upgrade in place run `migrate upgrade_repo_v2` followed by `prune`. See the documentation
   for more details. The migration checks the repository integrity and upgrades the repository
   format, but will not change any data. Afterwards, prune will rewrite the metadata to make use of
   compression.

   As an alternative you can use the `copy` command to migrate snapshots; First create a new
   repository using `init --repository-version 2 --copy-chunker-params --repo2
   path/to/old/repo`, and then use the `copy` command to copy all snapshots to the new
   repository.

   https://github.com/restic/restic/issues/21
   https://github.com/restic/restic/issues/3779
   https://github.com/restic/restic/pull/3666
   https://github.com/restic/restic/pull/3704
   https://github.com/restic/restic/pull/3733

 * Enhancement #1153: Support pruning even when the disk is full

   When running out of disk space it was no longer possible to add or remove data from a repository.
   To help with recovering from such a deadlock, the prune command now supports an
   `--unsafe-recover-no-free-space` option to recover from these situations. Make sure to
   read the documentation first!

   https://github.com/restic/restic/issues/1153
   https://github.com/restic/restic/pull/3481

 * Enhancement #2162: Adaptive IO concurrency based on backend connections

   Many commands used hard-coded limits for the number of concurrent operations. This prevented
   speed improvements by increasing the number of connections used by a backend.

   These limits have now been replaced by using the configured number of backend connections
   instead, which can be controlled using the `-o <backend-name>.connections=5` option.
   Commands will then automatically scale their parallelism accordingly.

   To limit the number of CPU cores used by restic, you can set the environment variable
   `GOMAXPROCS` accordingly. For example to use a single CPU core, use `GOMAXPROCS=1`.

   https://github.com/restic/restic/issues/2162
   https://github.com/restic/restic/issues/1467
   https://github.com/restic/restic/pull/3611

 * Enhancement #2291: Allow pack size customization

   Restic now uses a target pack size of 16 MiB by default. This can be customized using the
   `--pack-size size` option. Supported pack sizes range between 4 and 128 MiB.

   It is possible to migrate an existing repository to _larger_ pack files using `prune
   --repack-small`. This will rewrite every pack file which is significantly smaller than the
   target size.

   https://github.com/restic/restic/issues/2291
   https://github.com/restic/restic/pull/3731

 * Enhancement #2295: Allow use of SAS token to authenticate to Azure

   Previously restic only supported AccountKeys to authenticate to Azure storage accounts,
   which necessitates giving a significant amount of access.

   We added support for Azure SAS tokens which are a more fine-grained and time-limited manner of
   granting access. Set the `AZURE_ACCOUNT_NAME` and `AZURE_ACCOUNT_SAS` environment
   variables to use a SAS token for authentication. Note that if `AZURE_ACCOUNT_KEY` is set, it
   will take precedence.

   https://github.com/restic/restic/issues/2295
   https://github.com/restic/restic/pull/3661

 * Enhancement #2351: Use config file permissions to control file group access

   Previously files in a local/SFTP repository would always end up with very restrictive access
   permissions, allowing access only to the owner. This prevented a number of valid use-cases
   involving groups and ACLs.

   We now use the permissions of the config file in the repository to decide whether group access
   should be given to newly created repository files or not. We arrange for repository files to be
   created group readable exactly when the repository config file is group readable.

   To opt-in to group readable repositories, a simple `chmod -R g+r` or equivalent on the config
   file can be used. For repositories that should be writable by group members a tad more setup is
   required, see the docs.

   Posix ACLs can also be used now that the group permissions being forced to zero no longer masks
   the effect of ACL entries.

   https://github.com/restic/restic/issues/2351
   https://github.com/restic/restic/pull/3419
   https://forum.restic.net/t/1391

 * Enhancement #2696: Improve backup speed with many small files

   We have restructured the backup pipeline to continue reading files while all upload
   connections are busy. This allows the backup to already prepare the next data file such that the
   upload can continue as soon as a connection becomes available. This can especially improve the
   backup performance for high latency backends.

   The upload concurrency is now controlled using the `-o <backend-name>.connections=5`
   option.

   https://github.com/restic/restic/issues/2696
   https://github.com/restic/restic/pull/3489

 * Enhancement #2907: Make snapshot directory structure of `mount` command customizable

   We've added the possibility to customize the snapshot directory structure of the `mount`
   command using templates passed to the `--snapshot-template` option. The formatting of
   snapshots' timestamps is now controlled using `--time-template` and supports
   subdirectories to for example group snapshots by year. Please see `restic help mount` for
   further details.

   Characters in tag names which are not allowed in a filename are replaced by underscores `_`. For
   example a tag `foo/bar` will result in a directory name of `foo_bar`.

   https://github.com/restic/restic/issues/2907
   https://github.com/restic/restic/pull/2913
   https://github.com/restic/restic/pull/3691

 * Enhancement #2923: Improve speed of `copy` command

   The `copy` command could require a long time to copy snapshots for non-local backends. This has
   been improved to provide a throughput comparable to the `restore` command.

   Additionally, `copy` now displays a progress bar.

   https://github.com/restic/restic/issues/2923
   https://github.com/restic/restic/pull/3513

 * Enhancement #3114: Optimize handling of duplicate blobs in `prune`

   Restic `prune` always used to repack all data files containing duplicate blobs. This
   effectively removed all duplicates during prune. However, as a consequence all these data
   files were repacked even if the unused repository space threshold could be reached with less
   work.

   This is now changed and `prune` works nice and fast even when there are lots of duplicate blobs.

   https://github.com/restic/restic/issues/3114
   https://github.com/restic/restic/pull/3290

 * Enhancement #3465: Improve handling of temporary files on Windows

   In some cases restic failed to delete temporary files, causing the current command to fail.
   This has now been fixed by ensuring that Windows automatically deletes the file. In addition,
   temporary files are only written to disk when necessary, reducing disk writes.

   https://github.com/restic/restic/issues/3465
   https://github.com/restic/restic/issues/1551
   https://github.com/restic/restic/pull/3610

 * Enhancement #3475: Allow limiting IO concurrency for local and SFTP backend

   Restic did not support limiting the IO concurrency / number of connections for accessing
   repositories stored using the local or SFTP backends. The number of connections is now limited
   as for other backends, and can be configured via the the `-o local.connections=2` and `-o
   sftp.connections=5` options. This ensures that restic does not overwhelm the backend with
   concurrent IO operations.

   https://github.com/restic/restic/pull/3475

 * Enhancement #3484: Stream data in `check` and `prune` commands

   The commands `check --read-data` and `prune` previously downloaded data files into
   temporary files which could end up being written to disk. This could cause a large amount of data
   being written to disk.

   The pack files are now instead streamed, which removes the need for temporary files. Please
   note that *uploads* during `backup` and `prune` still require temporary files.

   https://github.com/restic/restic/issues/3710
   https://github.com/restic/restic/pull/3484
   https://github.com/restic/restic/pull/3717

 * Enhancement #3709: Validate exclude patterns before backing up

   Exclude patterns provided via `--exclude`, `--iexclude`, `--exclude-file` or
   `--iexclude-file` previously weren't validated. As a consequence, invalid patterns
   resulted in files that were meant to be excluded being backed up.

   Restic now validates all patterns before running the backup and aborts with a fatal error if an
   invalid pattern is detected.

   https://github.com/restic/restic/issues/3709
   https://github.com/restic/restic/pull/3734

 * Enhancement #3729: Display full IDs in `check` warnings

   When running commands to inspect or repair a damaged repository, it is often necessary to
   supply the full IDs of objects stored in the repository.

   The output of `check` now includes full IDs instead of their shortened variant.

   https://github.com/restic/restic/pull/3729

 * Enhancement #3773: Optimize memory usage for directories with many files

   Backing up a directory with hundreds of thousands or more files caused restic to require large
   amounts of memory. We've now optimized the `backup` command such that it requires up to 30% less
   memory.

   https://github.com/restic/restic/pull/3773

 * Enhancement #3819: Validate include/exclude patterns before restoring

   Patterns provided to `restore` via `--exclude`, `--iexclude`, `--include` and
   `--iinclude` weren't validated before running the restore. Invalid patterns would result in
   error messages being printed repeatedly, and possibly unwanted files being restored.

   Restic now validates all patterns before running the restore, and aborts with a fatal error if
   an invalid pattern is detected.

   https://github.com/restic/restic/pull/3819

 * Enhancement #3837: Improve SFTP repository initialization over slow links

   The `init` command, when used on an SFTP backend, now sends multiple `mkdir` commands to the
   backend concurrently. This reduces the waiting times when creating a repository over a very
   slow connection.

   https://github.com/restic/restic/issues/3837
   https://github.com/restic/restic/pull/3840


Changelog for restic 0.13.0 (2022-03-26)
=======================================

The following sections list the changes in restic 0.13.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1106: Never lock repository for `list locks`
 * Fix #2345: Make cache crash-resistant and usable by multiple concurrent processes
 * Fix #2452: Improve error handling of repository locking
 * Fix #2738: Don't print progress for `backup --json --quiet`
 * Fix #3382: Make `check` command honor `RESTIC_CACHE_DIR` environment variable
 * Fix #3488: `rebuild-index` failed if an index file was damaged
 * Fix #3518: Make `copy` command honor `--no-lock` for source repository
 * Fix #3556: Fix hang with Backblaze B2 on SSL certificate authority error
 * Fix #3591: Fix handling of `prune --max-repack-size=0`
 * Fix #3601: Fix rclone backend prematurely exiting when receiving SIGINT on Windows
 * Fix #3619: Avoid choosing parent snapshots newer than time of new snapshot
 * Fix #3667: The `mount` command now reports symlinks sizes
 * Chg #3519: Require Go 1.14 or newer
 * Chg #3641: Ignore parent snapshot for `backup --stdin`
 * Enh #233: Support negative include/exclude patterns
 * Enh #1542: Add `--dry-run`/`-n` option to `backup` command
 * Enh #2202: Add upload checksum for Azure, GS, S3 and Swift backends
 * Enh #2388: Add warning for S3 if partial credentials are provided
 * Enh #2508: Support JSON output and quiet mode for the `diff` command
 * Enh #2594: Speed up the `restore --verify` command
 * Enh #2656: Add flag to disable TLS verification for self-signed certificates
 * Enh #2816: The `backup` command no longer updates file access times on Linux
 * Enh #2880: Make `recover` collect only unreferenced trees
 * Enh #3003: Atomic uploads for the SFTP backend
 * Enh #3127: Add xattr (extended attributes) support for Solaris
 * Enh #3429: Verify that new or modified keys are stored correctly
 * Enh #3436: Improve local backend's resilience to (system) crashes
 * Enh #3464: Skip lock creation on `forget` if `--no-lock` and `--dry-run`
 * Enh #3490: Support random subset by size in `check --read-data-subset`
 * Enh #3508: Cache blobs read by the `dump` command
 * Enh #3511: Support configurable timeout for the rclone backend
 * Enh #3541: Improve handling of temporary B2 delete errors
 * Enh #3542: Add file mode in symbolic notation to `ls --json`
 * Enh #3593: Improve `copy` performance by parallelizing IO

Details
-------

 * Bugfix #1106: Never lock repository for `list locks`

   The `list locks` command previously locked to the repository by default. This had the problem
   that it wouldn't work for an exclusively locked repository and that the command would also
   display its own lock file which can be confusing.

   Now, the `list locks` command never locks the repository.

   https://github.com/restic/restic/issues/1106
   https://github.com/restic/restic/pull/3665

 * Bugfix #2345: Make cache crash-resistant and usable by multiple concurrent processes

   The restic cache directory (`RESTIC_CACHE_DIR`) could end up in a broken state in the event of
   restic (or the OS) crashing. This is now less likely to occur as files are downloaded to a
   temporary location before being moved to their proper location.

   This also allows multiple concurrent restic processes to operate on a single repository
   without conflicts. Previously, concurrent operations could cause segfaults because the
   processes saw each other's partially downloaded files.

   https://github.com/restic/restic/issues/2345
   https://github.com/restic/restic/pull/2838

 * Bugfix #2452: Improve error handling of repository locking

   Previously, when the lock refresh failed to delete the old lock file, it forgot about the newly
   created one. Instead it continued trying to delete the old (usually no longer existing) lock
   file and thus over time lots of lock files accumulated. This has now been fixed.

   https://github.com/restic/restic/issues/2452
   https://github.com/restic/restic/issues/2473
   https://github.com/restic/restic/issues/2562
   https://github.com/restic/restic/pull/3512

 * Bugfix #2738: Don't print progress for `backup --json --quiet`

   Unlike the text output, the `--json` output format still printed progress information even in
   `--quiet` mode. This has now been fixed by always disabling the progress output in quiet mode.

   https://github.com/restic/restic/issues/2738
   https://github.com/restic/restic/pull/3264

 * Bugfix #3382: Make `check` command honor `RESTIC_CACHE_DIR` environment variable

   Previously, the `check` command didn't honor the `RESTIC_CACHE_DIR` environment variable,
   which caused problems in certain system/usage configurations. This has now been fixed.

   https://github.com/restic/restic/issues/3382
   https://github.com/restic/restic/pull/3474

 * Bugfix #3488: `rebuild-index` failed if an index file was damaged

   Previously, the `rebuild-index` command would fail with an error if an index file was damaged
   or truncated. This has now been fixed.

   On older restic versions, a (slow) workaround is to use `rebuild-index --read-all-packs` or
   to manually delete the damaged index.

   https://github.com/restic/restic/pull/3488

 * Bugfix #3518: Make `copy` command honor `--no-lock` for source repository

   The `copy` command previously did not respect the `--no-lock` option for the source
   repository, causing failures with read-only storage backends. This has now been fixed such
   that the option is now respected.

   https://github.com/restic/restic/issues/3518
   https://github.com/restic/restic/pull/3589

 * Bugfix #3556: Fix hang with Backblaze B2 on SSL certificate authority error

   Previously, if a request failed with an SSL unknown certificate authority error, the B2
   backend retried indefinitely and restic would appear to hang.

   This has now been fixed and restic instead fails with an error message.

   https://github.com/restic/restic/issues/3556
   https://github.com/restic/restic/issues/2355
   https://github.com/restic/restic/pull/3571

 * Bugfix #3591: Fix handling of `prune --max-repack-size=0`

   Restic ignored the `--max-repack-size` option when passing a value of 0. This has now been
   fixed.

   As a workaround, `--max-repack-size=1` can be used with older versions of restic.

   https://github.com/restic/restic/pull/3591

 * Bugfix #3601: Fix rclone backend prematurely exiting when receiving SIGINT on Windows

   Previously, pressing Ctrl+C in a Windows console where restic was running with rclone as the
   backend would cause rclone to exit prematurely due to getting a `SIGINT` signal at the same time
   as restic. Restic would then wait for a long time for time with "unexpected EOF" and "rclone
   stdio connection already closed" errors.

   This has now been fixed by restic starting the rclone process detached from the console restic
   runs in (similar to starting processes in a new process group on Linux), which enables restic to
   gracefully clean up rclone (which now never gets the `SIGINT`).

   https://github.com/restic/restic/issues/3601
   https://github.com/restic/restic/pull/3602

 * Bugfix #3619: Avoid choosing parent snapshots newer than time of new snapshot

   The `backup` command, when a `--parent` was not provided, previously chose the most recent
   matching snapshot as the parent snapshot. However, this didn't make sense when the user passed
   `--time` to create a new snapshot older than the most recent snapshot.

   Instead, `backup` now chooses the most recent snapshot which is not newer than the
   snapshot-being-created's timestamp, to avoid any time travel.

   https://github.com/restic/restic/pull/3619

 * Bugfix #3667: The `mount` command now reports symlinks sizes

   Symlinks used to have size zero in restic mountpoints, confusing some third-party tools. They
   now have a size equal to the byte length of their target path, as required by POSIX.

   https://github.com/restic/restic/issues/3667
   https://github.com/restic/restic/pull/3668

 * Change #3519: Require Go 1.14 or newer

   Restic now requires Go 1.14 to build. This allows it to use new standard library features
   instead of an external dependency.

   https://github.com/restic/restic/issues/3519

 * Change #3641: Ignore parent snapshot for `backup --stdin`

   Restic uses a parent snapshot to speed up directory scanning when performing backups, but this
   only wasted time and memory when the backup source is stdin (using the `--stdin` option of the
   `backup` command), since no directory scanning is performed in this case.

   Snapshots made with `backup --stdin` no longer have a parent snapshot, which allows restic to
   skip some startup operations and saves a bit of resources.

   The `--parent` option is still available for `backup --stdin`, but is now ignored.

   https://github.com/restic/restic/issues/3641
   https://github.com/restic/restic/pull/3645

 * Enhancement #233: Support negative include/exclude patterns

   If a pattern starts with an exclamation mark and it matches a file that was previously matched by
   a regular pattern, the match is cancelled. Notably, this can be used with `--exclude-file` to
   cancel the exclusion of some files.

   It works similarly to `.gitignore`, with the same limitation; Once a directory is excluded, it
   is not possible to include files inside the directory.

   Example of use as an exclude pattern for the `backup` command:

   $HOME/**/* !$HOME/Documents !$HOME/code !$HOME/.emacs.d !$HOME/games # [...]
   node_modules *~ *.o *.lo *.pyc # [...] $HOME/code/linux/* !$HOME/code/linux/.git # [...]

   https://github.com/restic/restic/issues/233
   https://github.com/restic/restic/pull/2311

 * Enhancement #1542: Add `--dry-run`/`-n` option to `backup` command

   Testing exclude filters and other configuration options was error prone as wrong filters
   could cause files to be uploaded unintentionally. It was also not possible to estimate
   beforehand how much data would be uploaded.

   The `backup` command now has a `--dry-run`/`-n` option, which performs all the normal steps of
   a backup without actually writing anything to the repository.

   Passing -vv will log information about files that would be added, allowing for verification of
   source and exclusion options before running the real backup.

   https://github.com/restic/restic/issues/1542
   https://github.com/restic/restic/pull/2308
   https://github.com/restic/restic/pull/3210
   https://github.com/restic/restic/pull/3300

 * Enhancement #2202: Add upload checksum for Azure, GS, S3 and Swift backends

   Previously only the B2 and partially the Swift backends verified the integrity of uploaded
   (encrypted) files. The verification works by informing the backend about the expected hash of
   the uploaded file. The backend then verifies the upload and thereby rules out any data
   corruption during upload.

   We have now added upload checksums for the Azure, GS, S3 and Swift backends, which besides
   integrity checking for uploads also means that restic can now be used to store backups in S3
   buckets which have Object Lock enabled.

   https://github.com/restic/restic/issues/2202
   https://github.com/restic/restic/issues/2700
   https://github.com/restic/restic/issues/3023
   https://github.com/restic/restic/pull/3246

 * Enhancement #2388: Add warning for S3 if partial credentials are provided

   Previously restic did not notify about incomplete credentials when using the S3 backend,
   instead just reporting access denied.

   Restic now checks that both the AWS key ID and secret environment variables are set before
   connecting to the remote server, and reports an error if not.

   https://github.com/restic/restic/issues/2388
   https://github.com/restic/restic/pull/3532

 * Enhancement #2508: Support JSON output and quiet mode for the `diff` command

   The `diff` command now supports outputting machine-readable output in JSON format. To enable
   this, pass the `--json` option to the command. To only print the summary and suppress detailed
   output, pass the `--quiet` option.

   https://github.com/restic/restic/issues/2508
   https://github.com/restic/restic/pull/3592

 * Enhancement #2594: Speed up the `restore --verify` command

   The `--verify` option lets the `restore` command verify the file content after it has restored
   a snapshot. The performance of this operation has now been improved by up to a factor of two.

   https://github.com/restic/restic/pull/2594

 * Enhancement #2656: Add flag to disable TLS verification for self-signed certificates

   There is now an `--insecure-tls` global option in restic, which disables TLS verification for
   self-signed certificates in order to support some development workflows.

   https://github.com/restic/restic/issues/2656
   https://github.com/restic/restic/pull/2657

 * Enhancement #2816: The `backup` command no longer updates file access times on Linux

   When reading files during backup, restic used to cause the operating system to update the
   files' access times. Note that this did not apply to filesystems with disabled file access
   times.

   Restic now instructs the operating system not to update the file access time, if the user
   running restic is the file owner or has root permissions.

   https://github.com/restic/restic/pull/2816

 * Enhancement #2880: Make `recover` collect only unreferenced trees

   Previously, the `recover` command used to generate a snapshot containing *all* root trees,
   even those which were already referenced by a snapshot.

   This has been improved such that it now only processes trees not already referenced by any
   snapshot.

   https://github.com/restic/restic/pull/2880

 * Enhancement #3003: Atomic uploads for the SFTP backend

   The SFTP backend did not upload files atomically. An interrupted upload could leave an
   incomplete file behind which could prevent restic from accessing the repository. This has now
   been fixed and uploads in the SFTP backend are done atomically.

   https://github.com/restic/restic/issues/3003
   https://github.com/restic/restic/pull/3524

 * Enhancement #3127: Add xattr (extended attributes) support for Solaris

   Restic now supports xattr for the Solaris operating system.

   https://github.com/restic/restic/issues/3127
   https://github.com/restic/restic/pull/3628

 * Enhancement #3429: Verify that new or modified keys are stored correctly

   When adding a new key or changing the password of a key, restic used to just create the new key (and
   remove the old one, when changing the password). There was no verification that the new key was
   stored correctly and works properly. As the repository cannot be decrypted without a valid key
   file, this could in rare cases cause the repository to become inaccessible.

   Restic now checks that new key files actually work before continuing. This can protect against
   some (rare) cases of hardware or storage problems.

   https://github.com/restic/restic/pull/3429

 * Enhancement #3436: Improve local backend's resilience to (system) crashes

   Restic now ensures that files stored using the `local` backend are created atomically (that
   is, files are either stored completely or not at all). This ensures that no incomplete files are
   left behind even if restic is terminated while writing a file.

   In addition, restic now tries to ensure that the directory in the repository which contains a
   newly uploaded file is also written to disk. This can prevent missing files if the system
   crashes or the disk is not properly unmounted.

   https://github.com/restic/restic/pull/3436

 * Enhancement #3464: Skip lock creation on `forget` if `--no-lock` and `--dry-run`

   Restic used to silently ignore the `--no-lock` option of the `forget` command.

   It now skips creation of lock file in case both `--dry-run` and `--no-lock` are specified. If
   `--no-lock` option is specified without `--dry-run`, restic prints a warning message to
   stderr.

   https://github.com/restic/restic/issues/3464
   https://github.com/restic/restic/pull/3623

 * Enhancement #3490: Support random subset by size in `check --read-data-subset`

   The `--read-data-subset` option of the `check` command now supports a third way of specifying
   the subset to check, namely `nS` where `n` is a size in bytes with suffix `S` as k/K, m/M, g/G or
   t/T.

   https://github.com/restic/restic/issues/3490
   https://github.com/restic/restic/pull/3548

 * Enhancement #3508: Cache blobs read by the `dump` command

   When dumping a file using the `dump` command, restic did not cache blobs in any way, so even
   consecutive runs of the same blob were loaded from the repository again and again, slowing down
   the dump.

   Now, the caching mechanism already used by the `fuse` command is also used by the `dump`
   command. This makes dumping much faster, especially for sparse files.

   https://github.com/restic/restic/pull/3508

 * Enhancement #3511: Support configurable timeout for the rclone backend

   A slow rclone backend could cause restic to time out while waiting for the repository to open.
   Restic now offers an `-o rclone.timeout` option to make this timeout configurable.

   https://github.com/restic/restic/issues/3511
   https://github.com/restic/restic/pull/3514

 * Enhancement #3541: Improve handling of temporary B2 delete errors

   Deleting files on B2 could sometimes fail temporarily, which required restic to retry the
   delete operation. In some cases the file was deleted nevertheless, causing the retries and
   ultimately the restic command to fail. This has now been fixed.

   https://github.com/restic/restic/issues/3541
   https://github.com/restic/restic/pull/3544

 * Enhancement #3542: Add file mode in symbolic notation to `ls --json`

   The `ls --json` command now provides the file mode in symbolic notation (using the
   `permissions` key), aligned with `find --json`.

   https://github.com/restic/restic/issues/3542
   https://github.com/restic/restic/pull/3573
   https://forum.restic.net/t/restic-ls-understanding-file-mode-with-json/4371

 * Enhancement #3593: Improve `copy` performance by parallelizing IO

   Restic copy previously only used a single thread for copying blobs between repositories,
   which resulted in limited performance when copying small blobs to/from a high latency backend
   (i.e. any remote backend, especially b2).

   Copying will now use 8 parallel threads to increase the throughput of the copy operation.

   https://github.com/restic/restic/pull/3593


Changelog for restic 0.12.1 (2021-08-03)
=======================================

The following sections list the changes in restic 0.12.1 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #2742: Improve error handling for rclone and REST backend over HTTP2
 * Fix #3111: Fix terminal output redirection for PowerShell
 * Fix #3184: `backup --quiet` no longer prints status information
 * Fix #3214: Treat an empty password as a fatal error for repository init
 * Fix #3267: `copy` failed to copy snapshots in rare cases
 * Fix #3296: Fix crash of `check --read-data-subset=x%` run for an empty repository
 * Fix #3302: Fix `fdopendir: not a directory` error for local backend
 * Fix #3305: Fix possibly missing backup summary of JSON output in case of error
 * Fix #3334: Print `created new cache` message only on a terminal
 * Fix #3380: Fix crash of `backup --exclude='**'`
 * Fix #3439: Correctly handle download errors during `restore`
 * Chg #3247: Empty files now have size of 0 in `ls --json` output
 * Enh #2780: Add release binaries for s390x architecture on Linux
 * Enh #3167: Allow specifying limit of `snapshots` list
 * Enh #3293: Add `--repository-file2` option to `init` and `copy` command
 * Enh #3312: Add auto-completion support for fish
 * Enh #3336: SFTP backend now checks for disk space
 * Enh #3377: Add release binaries for Apple Silicon
 * Enh #3414: Add `--keep-within-hourly` option to restic forget
 * Enh #3426: Optimize read performance of mount command
 * Enh #3427: `find --pack` fallback to index if data file is missing
 * Enh #3456: Support filtering and specifying untagged snapshots

Details
-------

 * Bugfix #2742: Improve error handling for rclone and REST backend over HTTP2

   When retrieving data from the rclone / REST backend while also using HTTP2 restic did not detect
   when no data was returned at all. This could cause for example the `check` command to report the
   following error:

   Pack ID does not match, want [...], got e3b0c442

   This has been fixed by correctly detecting and retrying the incomplete download.

   https://github.com/restic/restic/issues/2742
   https://github.com/restic/restic/pull/3453
   https://forum.restic.net/t/http2-stream-closed-connection-reset-context-canceled/3743/10

 * Bugfix #3111: Fix terminal output redirection for PowerShell

   When redirecting the output of restic using PowerShell on Windows, the output contained
   terminal escape characters. This has been fixed by properly detecting the terminal type.

   In addition, the mintty terminal now shows progress output for the backup command.

   https://github.com/restic/restic/issues/3111
   https://github.com/restic/restic/pull/3325

 * Bugfix #3184: `backup --quiet` no longer prints status information

   A regression in the latest restic version caused the output of `backup --quiet` to contain
   large amounts of backup progress information when run using an interactive terminal. This is
   fixed now.

   A workaround for this bug is to run restic as follows: `restic backup --quiet [..] | cat -`.

   https://github.com/restic/restic/issues/3184
   https://github.com/restic/restic/pull/3186

 * Bugfix #3214: Treat an empty password as a fatal error for repository init

   When attempting to initialize a new repository, if an empty password was supplied, the
   repository would be created but the init command would return an error with a stack trace. Now,
   if an empty password is provided, it is treated as a fatal error, and no repository is created.

   https://github.com/restic/restic/issues/3214
   https://github.com/restic/restic/pull/3283

 * Bugfix #3267: `copy` failed to copy snapshots in rare cases

   The `copy` command could in rare cases fail with the error message `SaveTree(...) returned
   unexpected id ...`. This has been fixed.

   On Linux/BSDs, the error could be caused by backing up symlinks with non-UTF-8 target paths.
   Note that, due to limitations in the repository format, these are not stored properly and
   should be avoided if possible.

   https://github.com/restic/restic/issues/3267
   https://github.com/restic/restic/pull/3310

 * Bugfix #3296: Fix crash of `check --read-data-subset=x%` run for an empty repository

   The command `restic check --read-data-subset=x%` crashed when run for an empty repository.
   This has been fixed.

   https://github.com/restic/restic/issues/3296
   https://github.com/restic/restic/pull/3309

 * Bugfix #3302: Fix `fdopendir: not a directory` error for local backend

   The `check`, `list packs`, `prune` and `rebuild-index` commands failed for the local backend
   when the `data` folder in the repository contained files. This has been fixed.

   https://github.com/restic/restic/issues/3302
   https://github.com/restic/restic/pull/3308

 * Bugfix #3305: Fix possibly missing backup summary of JSON output in case of error

   When using `--json` output it happened from time to time that the summary output was missing in
   case an error occurred. This has been fixed.

   https://github.com/restic/restic/pull/3305

 * Bugfix #3334: Print `created new cache` message only on a terminal

   The message `created new cache` was printed even when the output wasn't a terminal. That broke
   piping `restic dump` output to tar or zip if cache directory didn't exist. The message is now
   only printed on a terminal.

   https://github.com/restic/restic/issues/3334
   https://github.com/restic/restic/pull/3343

 * Bugfix #3380: Fix crash of `backup --exclude='**'`

   The exclude filter `**`, which excludes all files, caused restic to crash. This has been
   corrected.

   https://github.com/restic/restic/issues/3380
   https://github.com/restic/restic/pull/3393

 * Bugfix #3439: Correctly handle download errors during `restore`

   Due to a regression in restic 0.12.0, the `restore` command in some cases did not retry download
   errors and only printed a warning. This has been fixed by retrying incomplete data downloads.

   https://github.com/restic/restic/issues/3439
   https://github.com/restic/restic/pull/3449

 * Change #3247: Empty files now have size of 0 in `ls --json` output

   The `ls --json` command used to omit the sizes of empty files in its output. It now reports a size
   of zero explicitly for regular files, while omitting the size field for all other types.

   https://github.com/restic/restic/issues/3247
   https://github.com/restic/restic/pull/3257

 * Enhancement #2780: Add release binaries for s390x architecture on Linux

   We've added release binaries for Linux using the s390x architecture.

   https://github.com/restic/restic/issues/2780
   https://github.com/restic/restic/pull/3452

 * Enhancement #3167: Allow specifying limit of `snapshots` list

   The `--last` option allowed limiting the output of the `snapshots` command to the latest
   snapshot for each host. The new `--latest n` option allows limiting the output to the latest `n`
   snapshots.

   This change deprecates the option `--last` in favour of `--latest 1`.

   https://github.com/restic/restic/pull/3167

 * Enhancement #3293: Add `--repository-file2` option to `init` and `copy` command

   The `init` and `copy` command can now be used with the `--repository-file2` option or the
   `$RESTIC_REPOSITORY_FILE2` environment variable. These to options are in addition to the
   `--repo2` flag and allow you to read the destination repository from a file.

   Using both `--repository-file` and `--repo2` options resulted in an error for the `copy` or
   `init` command. The handling of this combination of options has been fixed. A workaround for
   this issue is to only use `--repo` or `-r` and `--repo2` for `init` or `copy`.

   https://github.com/restic/restic/issues/3293
   https://github.com/restic/restic/pull/3294

 * Enhancement #3312: Add auto-completion support for fish

   The `generate` command now supports fish auto completion.

   https://github.com/restic/restic/pull/3312

 * Enhancement #3336: SFTP backend now checks for disk space

   Backing up over SFTP previously spewed multiple generic "failure" messages when the remote
   disk was full. It now checks for disk space before writing a file and fails immediately with a "no
   space left on device" message.

   https://github.com/restic/restic/issues/3336
   https://github.com/restic/restic/pull/3345

 * Enhancement #3377: Add release binaries for Apple Silicon

   We've added release binaries for macOS on Apple Silicon (M1).

   https://github.com/restic/restic/issues/3377
   https://github.com/restic/restic/pull/3394

 * Enhancement #3414: Add `--keep-within-hourly` option to restic forget

   The `forget` command allowed keeping a given number of hourly backups or to keep all backups
   within a given interval, but it was not possible to specify keeping hourly backups within a
   given interval.

   The new `--keep-within-hourly` option now offers this functionality. Similar options for
   daily/weekly/monthly/yearly are also implemented, the new options are:

   --keep-within-hourly <1y2m3d4h> --keep-within-daily <1y2m3d4h> --keep-within-weekly
   <1y2m3d4h> --keep-within-monthly <1y2m3d4h> --keep-within-yearly <1y2m3d4h>

   https://github.com/restic/restic/issues/3414
   https://github.com/restic/restic/pull/3416
   https://forum.restic.net/t/forget-policy/4014/11

 * Enhancement #3426: Optimize read performance of mount command

   Reading large files in a mounted repository may be up to five times faster. This improvement
   primarily applies to repositories stored at a backend that can be accessed with low latency,
   like e.g. the local backend.

   https://github.com/restic/restic/pull/3426

 * Enhancement #3427: `find --pack` fallback to index if data file is missing

   When investigating a repository with missing data files, it might be useful to determine
   affected snapshots before running `rebuild-index`. Previously, `find --pack pack-id`
   returned no data as it required accessing the data file. Now, if the necessary data is still
   available in the repository index, it gets retrieved from there.

   The command now also supports looking up multiple pack files in a single `find` run.

   https://github.com/restic/restic/pull/3427
   https://forum.restic.net/t/missing-packs-not-found/2600

 * Enhancement #3456: Support filtering and specifying untagged snapshots

   It was previously not possible to specify an empty tag with the `--tag` and `--keep-tag`
   options. This has now been fixed, such that `--tag ''` and `--keep-tag ''` now matches
   snapshots without tags. This allows e.g. the `snapshots` and `forget` commands to only
   operate on untagged snapshots.

   https://github.com/restic/restic/issues/3456
   https://github.com/restic/restic/pull/3457


Changelog for restic 0.12.0 (2021-02-14)
=======================================

The following sections list the changes in restic 0.12.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1681: Make `mount` not create missing mount point directory
 * Fix #1800: Ignore `no data available` filesystem error during backup
 * Fix #2563: Report the correct owner of directories in FUSE mounts
 * Fix #2688: Make `backup` and `tag` commands separate tags by comma
 * Fix #2739: Make the `cat` command respect the `--no-lock` option
 * Fix #3014: Fix sporadic stream reset between rclone and restic
 * Fix #3087: The `--use-fs-snapshot` option now works on windows/386
 * Fix #3100: Do not require gs bucket permissions when running `init`
 * Fix #3111: Correctly detect output redirection for `backup` command on Windows
 * Fix #3151: Don't create invalid snapshots when `backup` is interrupted
 * Fix #3152: Do not hang until foregrounded when completed in background
 * Fix #3166: Improve error handling in the `restore` command
 * Fix #3232: Correct statistics for overlapping targets
 * Fix #3249: Improve error handling in `gs` backend
 * Chg #3095: Deleting files on Google Drive now moves them to the trash
 * Enh #909: Back up mountpoints as empty directories
 * Enh #2186: Allow specifying percentage in `check --read-data-subset`
 * Enh #2433: Make the `dump` command support `zip` format
 * Enh #2453: Report permanent/fatal backend errors earlier
 * Enh #2495: Add option to let `backup` trust mtime without checking ctime
 * Enh #2528: Add Alibaba/Aliyun OSS support in the `s3` backend
 * Enh #2706: Configurable progress reports for non-interactive terminals
 * Enh #2718: Improve `prune` performance and make it more customizable
 * Enh #2941: Speed up the repacking step of the `prune` command
 * Enh #2944: Add `backup` options `--files-from-{verbatim,raw}`
 * Enh #3006: Speed up the `rebuild-index` command
 * Enh #3048: Add more checks for index and pack files in the `check` command
 * Enh #3083: Allow usage of deprecated S3 `ListObjects` API
 * Enh #3099: Reduce memory usage of `check` command
 * Enh #3106: Parallelize scan of snapshot content in `copy` and `prune`
 * Enh #3130: Parallelize reading of locks and snapshots
 * Enh #3147: Support additional environment variables for Swift authentication
 * Enh #3191: Add release binaries for MIPS architectures
 * Enh #3250: Add several more error checks
 * Enh #3254: Enable HTTP/2 for backend connections

Details
-------

 * Bugfix #1681: Make `mount` not create missing mount point directory

   When specifying a non-existent directory as mount point for the `mount` command, restic used
   to create the specified directory automatically.

   This has now changed such that restic instead gives an error when the specified directory for
   the mount point does not exist.

   https://github.com/restic/restic/issues/1681
   https://github.com/restic/restic/pull/3008

 * Bugfix #1800: Ignore `no data available` filesystem error during backup

   Restic was unable to backup files on some filesystems, for example certain configurations of
   CIFS on Linux which return a `no data available` error when reading extended attributes. These
   errors are now ignored.

   https://github.com/restic/restic/issues/1800
   https://github.com/restic/restic/pull/3034

 * Bugfix #2563: Report the correct owner of directories in FUSE mounts

   Restic 0.10.0 changed the FUSE mount to always report the current user as the owner of
   directories within the FUSE mount, which is incorrect.

   This is now changed back to reporting the correct owner of a directory.

   https://github.com/restic/restic/issues/2563
   https://github.com/restic/restic/pull/3141

 * Bugfix #2688: Make `backup` and `tag` commands separate tags by comma

   Running `restic backup --tag foo,bar` previously created snapshots with one single tag
   containing a comma (`foo,bar`) instead of two tags (`foo`, `bar`).

   Similarly, the `tag` command's `--set`, `--add` and `--remove` options would treat
   `foo,bar` as one tag instead of two tags. This was inconsistent with other commands and often
   unexpected when one intended `foo,bar` to mean two tags.

   To be consistent in all commands, restic now interprets `foo,bar` to mean two separate tags
   (`foo` and `bar`) instead of one tag (`foo,bar`) everywhere, including in the `backup` and
   `tag` commands.

   NOTE: This change might result in unexpected behavior in cases where you use the `forget`
   command and filter on tags like `foo,bar`. Snapshots previously backed up with `--tag
   foo,bar` will still not match that filter, but snapshots saved from now on will match that
   filter.

   To replace `foo,bar` tags with `foo` and `bar` tags in old snapshots, you can first generate a
   list of the relevant snapshots using a command like:

   Restic snapshots --json --quiet | jq '.[] | select(contains({tags: ["foo,bar"]})) | .id'

   And then use `restic tag --set foo --set bar snapshotID [...]` to set the new tags. Please adjust
   the commands to include real tag names and any additional tags, as well as the list of snapshots
   to process.

   https://github.com/restic/restic/issues/2688
   https://github.com/restic/restic/pull/2690
   https://github.com/restic/restic/pull/3197

 * Bugfix #2739: Make the `cat` command respect the `--no-lock` option

   The `cat` command would not respect the `--no-lock` flag. This is now fixed.

   https://github.com/restic/restic/issues/2739

 * Bugfix #3014: Fix sporadic stream reset between rclone and restic

   Sometimes when using restic with the `rclone` backend, an error message similar to the
   following would be printed:

   Didn't finish writing GET request (wrote 0/xxx): http2: stream closed

   It was found that this was caused by restic closing the connection to rclone to soon when
   downloading data. A workaround has been added which waits for the end of the download before
   closing the connection.

   https://github.com/rclone/rclone/issues/2598
   https://github.com/restic/restic/pull/3014

 * Bugfix #3087: The `--use-fs-snapshot` option now works on windows/386

   Restic failed to create VSS snapshots on windows/386 with the following error:

   GetSnapshotProperties() failed: E_INVALIDARG (0x80070057)

   This is now fixed.

   https://github.com/restic/restic/issues/3087
   https://github.com/restic/restic/pull/3090

 * Bugfix #3100: Do not require gs bucket permissions when running `init`

   Restic used to require bucket level permissions for the `gs` backend in order to initialize a
   restic repository.

   It now allows a `gs` service account to initialize a repository if the bucket does exist and the
   service account has permissions to write/read to that bucket.

   https://github.com/restic/restic/issues/3100

 * Bugfix #3111: Correctly detect output redirection for `backup` command on Windows

   On Windows, since restic 0.10.0 the `backup` command did not properly detect when the output
   was redirected to a file. This caused restic to output terminal control characters. This has
   been fixed by correcting the terminal detection.

   https://github.com/restic/restic/issues/3111
   https://github.com/restic/restic/pull/3150

 * Bugfix #3151: Don't create invalid snapshots when `backup` is interrupted

   When canceling a backup run at a certain moment it was possible that restic created a snapshot
   with an invalid "null" tree. This caused `check` and other operations to fail. The `backup`
   command now properly handles interruptions and never saves a snapshot when interrupted.

   https://github.com/restic/restic/issues/3151
   https://github.com/restic/restic/pull/3164

 * Bugfix #3152: Do not hang until foregrounded when completed in background

   On Linux, when running in the background restic failed to stop the terminal output of the
   `backup` command after it had completed. This caused restic to hang until moved to the
   foreground. This has now been fixed.

   https://github.com/restic/restic/pull/3152
   https://forum.restic.net/t/restic-alpine-container-cron-hangs-epoll-pwait/3334

 * Bugfix #3166: Improve error handling in the `restore` command

   The `restore` command used to not print errors while downloading file contents from the
   repository. It also incorrectly exited with a zero error code even when there were errors
   during the restore process. This has all been fixed and `restore` now returns with a non-zero
   exit code when there's an error.

   https://github.com/restic/restic/issues/3166
   https://github.com/restic/restic/pull/3207

 * Bugfix #3232: Correct statistics for overlapping targets

   A user reported that restic's statistics and progress information during backup was not
   correctly calculated when the backup targets (files/dirs to save) overlap. For example,
   consider a directory `foo` which contains (among others) a file `foo/bar`. When `restic
   backup foo foo/bar` was run, restic counted the size of the file `foo/bar` twice, so the
   completeness percentage as well as the number of files was wrong. This is now corrected.

   https://github.com/restic/restic/issues/3232
   https://github.com/restic/restic/pull/3243

 * Bugfix #3249: Improve error handling in `gs` backend

   The `gs` backend did not notice when the last step of completing a file upload failed. Under rare
   circumstances, this could cause missing files in the backup repository. This has now been
   fixed.

   https://github.com/restic/restic/pull/3249

 * Change #3095: Deleting files on Google Drive now moves them to the trash

   When deleting files on Google Drive via the `rclone` backend, restic used to bypass the trash
   folder required that one used the `-o rclone.args` option to enable usage of the trash folder.
   This ensured that deleted files in Google Drive were not kept indefinitely in the trash folder.
   However, since Google Drive's trash retention policy changed to deleting trashed files after
   30 days, this is no longer needed.

   Restic now leaves it up to rclone and its configuration to use or not use the trash folder when
   deleting files. The default is to use the trash folder, as of rclone 1.53.2. To re-enable the
   restic 0.11 behavior, set the `RCLONE_DRIVE_USE_TRASH` environment variable or change the
   rclone configuration. See the rclone documentation for more details.

   https://github.com/restic/restic/issues/3095
   https://github.com/restic/restic/pull/3102

 * Enhancement #909: Back up mountpoints as empty directories

   When the `--one-file-system` option is specified to `restic backup`, it ignores all file
   systems mounted below one of the target directories. This means that when a snapshot is
   restored, users needed to manually recreate the mountpoint directories.

   Restic now backs up mountpoints as empty directories and therefore implements the same
   approach as `tar`.

   https://github.com/restic/restic/issues/909
   https://github.com/restic/restic/pull/3119

 * Enhancement #2186: Allow specifying percentage in `check --read-data-subset`

   We've enhanced the `check` command's `--read-data-subset` option to also accept a
   percentage (e.g. `2.5%` or `10%`). This will check the given percentage of pack files (which
   are randomly selected on each run).

   https://github.com/restic/restic/issues/2186
   https://github.com/restic/restic/pull/3038

 * Enhancement #2433: Make the `dump` command support `zip` format

   Previously, restic could dump the contents of a whole folder structure only in the `tar`
   format. The `dump` command now has a new flag to change output format to `zip`. Just pass
   `--archive zip` as an option to `restic dump`.

   https://github.com/restic/restic/pull/2433
   https://github.com/restic/restic/pull/3081

 * Enhancement #2453: Report permanent/fatal backend errors earlier

   When encountering errors in reading from or writing to storage backends, restic retries the
   failing operation up to nine times (for a total of ten attempts). It used to retry all backend
   operations, but now detects some permanent error conditions so that it can report fatal errors
   earlier.

   Permanent failures include local disks being full, SSH connections dropping and permission
   errors.

   https://github.com/restic/restic/issues/2453
   https://github.com/restic/restic/issues/3180
   https://github.com/restic/restic/pull/3170
   https://github.com/restic/restic/pull/3181

 * Enhancement #2495: Add option to let `backup` trust mtime without checking ctime

   The `backup` command used to require that both `ctime` and `mtime` of a file matched with a
   previously backed up version to determine that the file was unchanged. In other words, if
   either `ctime` or `mtime` of the file had changed, it would be considered changed and restic
   would read the file's content again to back up the relevant (changed) parts of it.

   The new option `--ignore-ctime` makes restic look at `mtime` only, such that `ctime` changes
   for a file does not cause restic to read the file's contents again.

   The check for both `ctime` and `mtime` was introduced in restic 0.9.6 to make backups more
   reliable in the face of programs that reset `mtime` (some Unix archivers do that), but it turned
   out to often be expensive because it made restic read file contents even if only the metadata
   (owner, permissions) of a file had changed. The new `--ignore-ctime` option lets the user
   restore the 0.9.5 behavior when needed. The existing `--ignore-inode` option already turned
   off this behavior, but also removed a different check.

   Please note that changes in files' metadata are still recorded, regardless of the command line
   options provided to the backup command.

   https://github.com/restic/restic/issues/2495
   https://github.com/restic/restic/issues/2558
   https://github.com/restic/restic/issues/2819
   https://github.com/restic/restic/pull/2823

 * Enhancement #2528: Add Alibaba/Aliyun OSS support in the `s3` backend

   A new extended option `s3.bucket-lookup` has been added to support Alibaba/Aliyun OSS in the
   `s3` backend. The option can be set to one of the following values:

   - `auto` - Existing behaviour - `dns` - Use DNS style bucket access - `path` - Use path style
   bucket access

   To make the `s3` backend work with Alibaba/Aliyun OSS you must set `s3.bucket-lookup` to `dns`
   and set the `s3.region` parameter. For example:

   Restic -o s3.bucket-lookup=dns -o s3.region=oss-eu-west-1 -r
   s3:https://oss-eu-west-1.aliyuncs.com/bucketname init

   Note that `s3.region` must be set, otherwise the MinIO SDK tries to look it up and it seems that
   Alibaba doesn't support that properly.

   https://github.com/restic/restic/issues/2528
   https://github.com/restic/restic/pull/2535

 * Enhancement #2706: Configurable progress reports for non-interactive terminals

   The `backup`, `check` and `prune` commands never printed any progress reports on
   non-interactive terminals. This behavior is now configurable using the
   `RESTIC_PROGRESS_FPS` environment variable. Use for example a value of `1` for an update
   every second, or `0.01666` for an update every minute.

   The `backup` command now also prints the current progress when restic receives a `SIGUSR1`
   signal.

   Setting the `RESTIC_PROGRESS_FPS` environment variable or sending a `SIGUSR1` signal
   prints a status report even when `--quiet` was specified.

   https://github.com/restic/restic/issues/2706
   https://github.com/restic/restic/issues/3194
   https://github.com/restic/restic/pull/3199

 * Enhancement #2718: Improve `prune` performance and make it more customizable

   The `prune` command is now much faster. This is especially the case for remote repositories or
   repositories with not much data to remove. Also the memory usage of the `prune` command is now
   reduced.

   Restic used to rebuild the index from scratch after pruning. This could lead to missing packs in
   the index in some cases for eventually consistent backends such as e.g. AWS S3. This behavior is
   now changed and the index rebuilding uses the information already known by `prune`.

   By default, the `prune` command no longer removes all unused data. This behavior can be
   fine-tuned by new options, like the acceptable amount of unused space or the maximum size of
   data to reorganize. For more details, please see
   https://restic.readthedocs.io/en/stable/060_forget.html .

   Moreover, `prune` now accepts the `--dry-run` option and also running `forget --dry-run
   --prune` will show what `prune` would do.

   This enhancement also fixes several open issues, e.g.: -
   https://github.com/restic/restic/issues/1140 -
   https://github.com/restic/restic/issues/1599 -
   https://github.com/restic/restic/issues/1985 -
   https://github.com/restic/restic/issues/2112 -
   https://github.com/restic/restic/issues/2227 -
   https://github.com/restic/restic/issues/2305

   https://github.com/restic/restic/pull/2718
   https://github.com/restic/restic/pull/2842

 * Enhancement #2941: Speed up the repacking step of the `prune` command

   The repack step of the `prune` command, which moves still used file parts into new pack files
   such that the old ones can be garbage collected later on, now processes multiple pack files in
   parallel. This is especially beneficial for high latency backends or when using a fast network
   connection.

   https://github.com/restic/restic/pull/2941

 * Enhancement #2944: Add `backup` options `--files-from-{verbatim,raw}`

   The new `backup` options `--files-from-verbatim` and `--files-from-raw` read a list of
   files to back up from a file. Unlike the existing `--files-from` option, these options do not
   interpret the listed filenames as glob patterns; instead, whitespace in filenames is
   preserved as-is and no pattern expansion is done. Please see the documentation for specifics.

   These new options are highly recommended over `--files-from`, when using a script to generate
   the list of files to back up.

   https://github.com/restic/restic/issues/2944
   https://github.com/restic/restic/issues/3013

 * Enhancement #3006: Speed up the `rebuild-index` command

   We've optimized the `rebuild-index` command. Now, existing index entries are used to
   minimize the number of pack files that must be read. This speeds up the index rebuild a lot.

   Additionally, the option `--read-all-packs` has been added, implementing the previous
   behavior.

   https://github.com/restic/restic/pull/3006
   https://github.com/restic/restic/issue/2547

 * Enhancement #3048: Add more checks for index and pack files in the `check` command

   The `check` command run with the `--read-data` or `--read-data-subset` options used to only
   verify only the pack file content - it did not check if the blobs within the pack are correctly
   contained in the index.

   A check for the latter is now in place, which can print the following error:

   Blob ID is not contained in index or position is incorrect

   Another test is also added, which compares pack file sizes computed from the index and the pack
   header with the actual file size. This test is able to detect truncated pack files.

   If the index is not correct, it can be rebuilt by using the `rebuild-index` command.

   Having added these tests, `restic check` is now able to detect non-existing blobs which are
   wrongly referenced in the index. This situation could have lead to missing data.

   https://github.com/restic/restic/pull/3048
   https://github.com/restic/restic/pull/3082

 * Enhancement #3083: Allow usage of deprecated S3 `ListObjects` API

   Some S3 API implementations, e.g. Ceph before version 14.2.5, have a broken `ListObjectsV2`
   implementation which causes problems for restic when using their API endpoints. When a broken
   server implementation is used, restic prints errors similar to the following:

   List() returned error: Truncated response should have continuation token set

   As a temporary workaround, restic now allows using the older `ListObjects` endpoint by
   setting the `s3.list-objects-v1` extended option, for instance:

   Restic -o s3.list-objects-v1=true snapshots

   Please note that this option may be removed in future versions of restic.

   https://github.com/restic/restic/issues/3083
   https://github.com/restic/restic/pull/3085

 * Enhancement #3099: Reduce memory usage of `check` command

   The `check` command now requires less memory if it is run without the `--check-unused` option.

   https://github.com/restic/restic/pull/3099

 * Enhancement #3106: Parallelize scan of snapshot content in `copy` and `prune`

   The `copy` and `prune` commands used to traverse the directories of snapshots one by one to find
   used data. This snapshot traversal is now parallized which can speed up this step several
   times.

   In addition the `check` command now reports how many snapshots have already been processed.

   https://github.com/restic/restic/pull/3106

 * Enhancement #3130: Parallelize reading of locks and snapshots

   Restic used to read snapshots sequentially. For repositories containing many snapshots this
   slowed down commands which have to read all snapshots.

   Now the reading of snapshots is parallelized. This speeds up for example `prune`, `backup` and
   other commands that search for snapshots with certain properties or which have to find the
   `latest` snapshot.

   The speed up also applies to locks stored in the backup repository.

   https://github.com/restic/restic/pull/3130
   https://github.com/restic/restic/pull/3174

 * Enhancement #3147: Support additional environment variables for Swift authentication

   The `swift` backend now supports the following additional environment variables for passing
   authentication details to restic: `OS_USER_ID`, `OS_USER_DOMAIN_ID`,
   `OS_PROJECT_DOMAIN_ID` and `OS_TRUST_ID`

   Depending on the `openrc` configuration file these might be required when the user and project
   domains differ from one another.

   https://github.com/restic/restic/issues/3147
   https://github.com/restic/restic/pull/3158

 * Enhancement #3191: Add release binaries for MIPS architectures

   We've added a few new architectures for Linux to the release binaries: `mips`, `mipsle`,
   `mips64`, and `mip64le`. MIPS is mostly used for low-end embedded systems.

   https://github.com/restic/restic/issues/3191
   https://github.com/restic/restic/pull/3208

 * Enhancement #3250: Add several more error checks

   We've added a lot more error checks in places where errors were previously ignored (as hinted by
   the static analysis program `errcheck` via `golangci-lint`).

   https://github.com/restic/restic/pull/3250

 * Enhancement #3254: Enable HTTP/2 for backend connections

   Go's HTTP library usually automatically chooses between HTTP/1.x and HTTP/2 depending on
   what the server supports. But for compatibility this mechanism is disabled if DialContext is
   used (which is the case for restic). This change allows restic's HTTP client to negotiate
   HTTP/2 if supported by the server.

   https://github.com/restic/restic/pull/3254


Changelog for restic 0.11.0 (2020-11-05)
=======================================

The following sections list the changes in restic 0.11.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1212: Restore timestamps and permissions on intermediate directories
 * Fix #1756: Mark repository files as read-only when using the local backend
 * Fix #2241: Hide password in REST backend repository URLs
 * Fix #2319: Correctly dump directories into tar files
 * Fix #2491: Don't require `self-update --output` placeholder file
 * Fix #2834: Fix rare cases of backup command hanging forever
 * Fix #2938: Fix manpage formatting
 * Fix #2942: Make --exclude-larger-than handle disappearing files
 * Fix #2951: Restic generate, help and self-update no longer check passwords
 * Fix #2979: Make snapshots --json output [] instead of null when no snapshots
 * Enh #340: Add support for Volume Shadow Copy Service (VSS) on Windows
 * Enh #1458: New option --repository-file
 * Enh #2849: Authenticate to Google Cloud Storage with access token
 * Enh #2969: Optimize check for unchanged files during backup
 * Enh #2978: Warn if parent snapshot cannot be loaded during backup

Details
-------

 * Bugfix #1212: Restore timestamps and permissions on intermediate directories

   When using the `--include` option of the restore command, restic restored timestamps and
   permissions only on directories selected by the include pattern. Intermediate directories,
   which are necessary to restore files located in sub- directories, were created with default
   permissions. We've fixed the restore command to restore timestamps and permissions for these
   directories as well.

   https://github.com/restic/restic/issues/1212
   https://github.com/restic/restic/issues/1402
   https://github.com/restic/restic/pull/2906

 * Bugfix #1756: Mark repository files as read-only when using the local backend

   Files stored in a local repository were marked as writeable on the filesystem for non-Windows
   systems, which did not prevent accidental file modifications outside of restic. In addition,
   the local backend did not work with certain filesystems and network mounts which do not permit
   modifications of file permissions.

   Restic now marks files stored in a local repository as read-only on the filesystem on
   non-Windows systems. The error handling is improved to support more filesystems.

   https://github.com/restic/restic/issues/1756
   https://github.com/restic/restic/issues/2157
   https://github.com/restic/restic/pull/2989

 * Bugfix #2241: Hide password in REST backend repository URLs

   When using a password in the REST backend repository URL, the password could in some cases be
   included in the output from restic, e.g. when initializing a repo or during an error.

   The password is now replaced with "***" where applicable.

   https://github.com/restic/restic/issues/2241
   https://github.com/restic/restic/pull/2658

 * Bugfix #2319: Correctly dump directories into tar files

   The dump command previously wrote directories in a tar file in a way which can cause
   compatibility problems. This caused, for example, 7zip on Windows to not open tar files
   containing directories. In addition it was not possible to dump directories with extended
   attributes. These compatibility problems are now corrected.

   In addition, a tar file now includes the name of the owner and group of a file.

   https://github.com/restic/restic/issues/2319
   https://github.com/restic/restic/pull/3039

 * Bugfix #2491: Don't require `self-update --output` placeholder file

   `restic self-update --output /path/to/new-restic` used to require that new-restic was an
   existing file, to be overwritten. Now it's possible to download an updated restic binary to a
   new path, without first having to create a placeholder file.

   https://github.com/restic/restic/issues/2491
   https://github.com/restic/restic/pull/2937

 * Bugfix #2834: Fix rare cases of backup command hanging forever

   We've fixed an issue with the backup progress reporting which could cause restic to hang
   forever right before finishing a backup.

   https://github.com/restic/restic/issues/2834
   https://github.com/restic/restic/pull/2963

 * Bugfix #2938: Fix manpage formatting

   The manpage formatting in restic v0.10.0 was garbled, which is fixed now.

   https://github.com/restic/restic/issues/2938
   https://github.com/restic/restic/pull/2977

 * Bugfix #2942: Make --exclude-larger-than handle disappearing files

   There was a small bug in the backup command's --exclude-larger-than option where files that
   disappeared between scanning and actually backing them up to the repository caused a panic.
   This is now fixed.

   https://github.com/restic/restic/issues/2942

 * Bugfix #2951: Restic generate, help and self-update no longer check passwords

   The commands `restic cache`, `generate`, `help` and `self-update` don't need passwords, but
   they previously did run the RESTIC_PASSWORD_COMMAND (if set in the environment), prompting
   users to authenticate for no reason. They now skip running the password command.

   https://github.com/restic/restic/issues/2951
   https://github.com/restic/restic/pull/2987

 * Bugfix #2979: Make snapshots --json output [] instead of null when no snapshots

   Restic previously output `null` instead of `[]` for the `--json snapshots` command, when
   there were no snapshots in the repository. This caused some minor problems when parsing the
   output, but is now fixed such that `[]` is output when the list of snapshots is empty.

   https://github.com/restic/restic/issues/2979
   https://github.com/restic/restic/pull/2984

 * Enhancement #340: Add support for Volume Shadow Copy Service (VSS) on Windows

   Volume Shadow Copy Service allows read access to files that are locked by another process using
   an exclusive lock through a filesystem snapshot. Restic was unable to backup those files
   before. This update enables backing up these files.

   This needs to be enabled explicitely using the --use-fs-snapshot option of the backup
   command.

   https://github.com/restic/restic/issues/340
   https://github.com/restic/restic/pull/2274

 * Enhancement #1458: New option --repository-file

   We've added a new command-line option --repository-file as an alternative to -r. This allows
   to read the repository URL from a file in order to prevent certain types of information leaks,
   especially for URLs containing credentials.

   https://github.com/restic/restic/issues/1458
   https://github.com/restic/restic/issues/2900
   https://github.com/restic/restic/pull/2910

 * Enhancement #2849: Authenticate to Google Cloud Storage with access token

   When using the GCS backend, it is now possible to authenticate with OAuth2 access tokens
   instead of a credentials file by setting the GOOGLE_ACCESS_TOKEN environment variable.

   https://github.com/restic/restic/pull/2849

 * Enhancement #2969: Optimize check for unchanged files during backup

   During a backup restic skips processing files which have not changed since the last backup run.
   Previously this required opening each file once which can be slow on network filesystems. The
   backup command now checks for file changes before opening a file. This considerably reduces
   the time to create a backup on network filesystems.

   https://github.com/restic/restic/issues/2969
   https://github.com/restic/restic/pull/2970

 * Enhancement #2978: Warn if parent snapshot cannot be loaded during backup

   During a backup restic uses the parent snapshot to check whether a file was changed and has to be
   backed up again. For this check the backup has to read the directories contained in the old
   snapshot. If a tree blob cannot be loaded, restic now warns about this problem with the backup
   repository.

   https://github.com/restic/restic/pull/2978


Changelog for restic 0.10.0 (2020-09-19)
=======================================

The following sections list the changes in restic 0.10.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1863: Report correct number of directories processed by backup
 * Fix #2254: Fix tar issues when dumping `/`
 * Fix #2281: Handle format verbs like '%' properly in `find` output
 * Fix #2298: Do not hang when run as a background job
 * Fix #2389: Fix mangled json output of backup command
 * Fix #2390: Refresh lock timestamp
 * Fix #2429: Backup --json reports total_bytes_processed as 0
 * Fix #2469: Fix incorrect bytes stats in `diff` command
 * Fix #2518: Do not crash with Synology NAS sftp server
 * Fix #2531: Fix incorrect size calculation in `stats --mode restore-size`
 * Fix #2537: Fix incorrect file counts in `stats --mode restore-size`
 * Fix #2592: SFTP backend supports IPv6 addresses
 * Fix #2607: Honor RESTIC_CACHE_DIR environment variable on Mac and Windows
 * Fix #2668: Don't abort the stats command when data blobs are missing
 * Fix #2674: Add stricter prune error checks
 * Fix #2899: Fix possible crash in the progress bar of check --read-data
 * Chg #1597: Honor the --no-lock flag in the mount command
 * Chg #2482: Remove vendored dependencies
 * Chg #2546: Return exit code 3 when failing to backup all source data
 * Chg #2600: Update dependencies, require Go >= 1.13
 * Enh #323: Add command for copying snapshots between repositories
 * Enh #551: Use optimized library for hash calculation of file chunks
 * Enh #1570: Support specifying multiple host flags for various commands
 * Enh #1680: Optimize `restic mount`
 * Enh #2072: Display snapshot date when using `restic find`
 * Enh #2175: Allow specifying user and host when creating keys
 * Enh #2195: Simplify and improve restore performance
 * Enh #2277: Add support for ppc64le
 * Enh #2328: Improve speed of check command
 * Enh #2395: Ignore sync errors when operation not supported by local filesystem
 * Enh #2423: Support user@domain parsing as user
 * Enh #2427: Add flag `--iexclude-file` to backup command
 * Enh #2569: Support excluding files by their size
 * Enh #2571: Self-heal missing file parts during backup of unchanged files
 * Enh #2576: Improve the chunking algorithm
 * Enh #2598: Improve speed of diff command
 * Enh #2599: Slightly reduce memory usage of prune and stats commands
 * Enh #2733: S3 backend: Add support for WebIdentityTokenFile
 * Enh #2773: Optimize handling of new index entries
 * Enh #2781: Reduce memory consumption of in-memory index
 * Enh #2786: Optimize `list blobs` command
 * Enh #2790: Optimized file access in restic mount
 * Enh #2840: Speed-up file deletion in forget, prune and rebuild-index
 * Enh #2858: Support filtering snapshots by tag and path in the stats command

Details
-------

 * Bugfix #1863: Report correct number of directories processed by backup

   The directory statistics calculation was fixed to report the actual number of processed
   directories instead of always zero.

   https://github.com/restic/restic/issues/1863

 * Bugfix #2254: Fix tar issues when dumping `/`

   We've fixed an issue with dumping either `/` or files on the first sublevel e.g. `/foo` to tar.
   This also fixes tar dumping issues on Windows where this issue could also happen.

   https://github.com/restic/restic/issues/2254
   https://github.com/restic/restic/issues/2357
   https://github.com/restic/restic/pull/2255

 * Bugfix #2281: Handle format verbs like '%' properly in `find` output

   The JSON or "normal" output of the `find` command can now deal with file names that contain
   substrings which the Golang `fmt` package considers "format verbs" like `%s`.

   https://github.com/restic/restic/issues/2281

 * Bugfix #2298: Do not hang when run as a background job

   Restic did hang on exit while restoring the terminal configuration when it was started as a
   background job, for example using `restic ... &`. This has been fixed by only restoring the
   terminal configuration when restic is interrupted while reading a password from the
   terminal.

   https://github.com/restic/restic/issues/2298

 * Bugfix #2389: Fix mangled json output of backup command

   We've fixed a race condition in the json output of the backup command that could cause multiple
   lines to get mixed up. We've also ensured that the backup summary is printed last.

   https://github.com/restic/restic/issues/2389
   https://github.com/restic/restic/pull/2545

 * Bugfix #2390: Refresh lock timestamp

   Long-running operations did not refresh lock timestamp, resulting in locks becoming stale.
   This is now fixed.

   https://github.com/restic/restic/issues/2390

 * Bugfix #2429: Backup --json reports total_bytes_processed as 0

   We've fixed the json output of total_bytes_processed. The non-json output was already fixed
   with pull request #2138 but left the json output untouched.

   https://github.com/restic/restic/issues/2429

 * Bugfix #2469: Fix incorrect bytes stats in `diff` command

   In some cases, the wrong number of bytes (e.g. 16777215.998 TiB) were reported by the `diff`
   command. This is now fixed.

   https://github.com/restic/restic/issues/2469

 * Bugfix #2518: Do not crash with Synology NAS sftp server

   It was found that when restic is used to store data on an sftp server on a Synology NAS with a
   relative path (one which does not start with a slash), it may go into an endless loop trying to
   create directories on the server. We've fixed this bug by using a function in the sftp library
   instead of our own implementation.

   The bug was discovered because the Synology sftp server behaves erratic with non-absolute
   path (e.g. `home/restic-repo`). This can be resolved by just using an absolute path instead
   (`/home/restic-repo`). We've also added a paragraph in the FAQ.

   https://github.com/restic/restic/issues/2518
   https://github.com/restic/restic/issues/2363
   https://github.com/restic/restic/pull/2530

 * Bugfix #2531: Fix incorrect size calculation in `stats --mode restore-size`

   The restore-size mode of stats was counting hard-linked files as if they were independent.

   https://github.com/restic/restic/issues/2531

 * Bugfix #2537: Fix incorrect file counts in `stats --mode restore-size`

   The restore-size mode of stats was failing to count empty directories and some files with hard
   links.

   https://github.com/restic/restic/issues/2537

 * Bugfix #2592: SFTP backend supports IPv6 addresses

   The SFTP backend now supports IPv6 addresses natively, without relying on aliases in the
   external SSH configuration.

   https://github.com/restic/restic/pull/2592

 * Bugfix #2607: Honor RESTIC_CACHE_DIR environment variable on Mac and Windows

   On Mac and Windows, the RESTIC_CACHE_DIR environment variable was ignored. This variable can
   now be used on all platforms to set the directory where restic stores caches.

   https://github.com/restic/restic/pull/2607

 * Bugfix #2668: Don't abort the stats command when data blobs are missing

   Runing the stats command in the blobs-per-file mode on a repository with missing data blobs
   previously resulted in a crash.

   https://github.com/restic/restic/pull/2668

 * Bugfix #2674: Add stricter prune error checks

   Additional checks were added to the prune command in order to improve resiliency to backend,
   hardware and/or networking issues. The checks now detect a few more cases where such outside
   factors could potentially cause data loss.

   https://github.com/restic/restic/pull/2674

 * Bugfix #2899: Fix possible crash in the progress bar of check --read-data

   We've fixed a possible crash while displaying the progress bar for the check --read-data
   command. The crash occurred when the length of the progress bar status exceeded the terminal
   width, which only happened for very narrow terminal windows.

   https://github.com/restic/restic/pull/2899
   https://forum.restic.net/t/restic-rclone-pcloud-connection-issues/2963/15

 * Change #1597: Honor the --no-lock flag in the mount command

   The mount command now does not lock the repository if given the --no-lock flag. This allows to
   mount repositories which are archived on a read only backend/filesystem.

   https://github.com/restic/restic/issues/1597
   https://github.com/restic/restic/pull/2821

 * Change #2482: Remove vendored dependencies

   We've removed the vendored dependencies (in the subdir `vendor/`). When building restic, the
   Go compiler automatically fetches the dependencies. It will also cryptographically verify
   that the correct code has been fetched by using the hashes in `go.sum` (see the link to the
   documentation below).

   https://github.com/restic/restic/issues/2482
   https://golang.org/cmd/go/#hdr-Module_downloading_and_verification

 * Change #2546: Return exit code 3 when failing to backup all source data

   The backup command used to return a zero exit code as long as a snapshot could be created
   successfully, even if some of the source files could not be read (in which case the snapshot
   would contain the rest of the files).

   This made it hard for automation/scripts to detect failures/incomplete backups by looking at
   the exit code. Restic now returns the following exit codes for the backup command:

   - 0 when the command was successful - 1 when there was a fatal error (no snapshot created) - 3 when
   some source data could not be read (incomplete snapshot created)

   https://github.com/restic/restic/issues/956
   https://github.com/restic/restic/issues/2064
   https://github.com/restic/restic/issues/2526
   https://github.com/restic/restic/issues/2364
   https://github.com/restic/restic/pull/2546

 * Change #2600: Update dependencies, require Go >= 1.13

   Restic now requires Go to be at least 1.13. This allows simplifications in the build process and
   removing workarounds.

   This is also probably the last version of restic still supporting mounting repositories via
   fuse on macOS. The library we're using for fuse does not support macOS any more and osxfuse is not
   open source any more.

   https://github.com/bazil/fuse/issues/224
   https://github.com/osxfuse/osxfuse/issues/590
   https://github.com/restic/restic/pull/2600
   https://github.com/restic/restic/pull/2852
   https://github.com/restic/restic/pull/2927

 * Enhancement #323: Add command for copying snapshots between repositories

   We've added a copy command, allowing you to copy snapshots from one repository to another.

   Note that this process will have to read (download) and write (upload) the entire snapshot(s)
   due to the different encryption keys used on the source and destination repository. Also, the
   transferred files are not re-chunked, which may break deduplication between files already
   stored in the destination repo and files copied there using this command.

   To fully support deduplication between repositories when the copy command is used, the init
   command now supports the `--copy-chunker-params` option, which initializes the new
   repository with identical parameters for splitting files into chunks as an already existing
   repository. This allows copied snapshots to be equally deduplicated in both repositories.

   https://github.com/restic/restic/issues/323
   https://github.com/restic/restic/pull/2606
   https://github.com/restic/restic/pull/2928

 * Enhancement #551: Use optimized library for hash calculation of file chunks

   We've switched the library used to calculate the hashes of file chunks, which are used for
   deduplication, to the optimized Minio SHA-256 implementation.

   Depending on the CPU it improves the hashing throughput by 10-30%. Modern x86 CPUs with the SHA
   Extension should be about two to three times faster.

   https://github.com/restic/restic/issues/551
   https://github.com/restic/restic/pull/2709

 * Enhancement #1570: Support specifying multiple host flags for various commands

   Previously commands didn't take more than one `--host` or `-H` argument into account, which
   could be limiting with e.g. the `forget` command.

   The `dump`, `find`, `forget`, `ls`, `mount`, `restore`, `snapshots`, `stats` and `tag`
   commands will now take into account multiple `--host` and `-H` flags.

   https://github.com/restic/restic/issues/1570

 * Enhancement #1680: Optimize `restic mount`

   We've optimized the FUSE implementation used within restic. `restic mount` is now more
   responsive and uses less memory.

   https://github.com/restic/restic/issues/1680
   https://github.com/restic/restic/pull/2587
   https://github.com/restic/restic/pull/2787

 * Enhancement #2072: Display snapshot date when using `restic find`

   Added the respective snapshot date to the output of `restic find`.

   https://github.com/restic/restic/issues/2072

 * Enhancement #2175: Allow specifying user and host when creating keys

   When adding a new key to the repository, the username and hostname for the new key can be
   specified on the command line. This allows overriding the defaults, for example if you would
   prefer to use the FQDN to identify the host or if you want to add keys for several different hosts
   without having to run the key add command on those hosts.

   https://github.com/restic/restic/issues/2175

 * Enhancement #2195: Simplify and improve restore performance

   Significantly improves restore performance of large files (i.e. 50M+):
   https://github.com/restic/restic/issues/2074
   https://forum.restic.net/t/restore-using-rclone-gdrive-backend-is-slow/1112/8
   https://forum.restic.net/t/degraded-restore-performance-s3-backend/1400

   Fixes "not enough cache capacity" error during restore:
   https://github.com/restic/restic/issues/2244

   NOTE: This new implementation does not guarantee order in which blobs are written to the target
   files and, for example, the last blob of a file can be written to the file before any of the
   preceeding file blobs. It is therefore possible to have gaps in the data written to the target
   files if restore fails or interrupted by the user.

   The implementation will try to preallocate space for the restored files on the filesystem to
   prevent file fragmentation. This ensures good read performance for large files, like for
   example VM images. If preallocating space is not supported by the filesystem, then this step is
   silently skipped.

   https://github.com/restic/restic/pull/2195
   https://github.com/restic/restic/pull/2893

 * Enhancement #2277: Add support for ppc64le

   Adds support for ppc64le, the processor architecture from IBM.

   https://github.com/restic/restic/issues/2277

 * Enhancement #2328: Improve speed of check command

   We've improved the check command to traverse trees only once independent of whether they are
   contained in multiple snapshots. The check command is now much faster for repositories with a
   large number of snapshots.

   https://github.com/restic/restic/issues/2284
   https://github.com/restic/restic/pull/2328

 * Enhancement #2395: Ignore sync errors when operation not supported by local filesystem

   The local backend has been modified to work with filesystems which doesn't support the `sync`
   operation. This operation is normally used by restic to ensure that data files are fully
   written to disk before continuing.

   For these limited filesystems, saving a file in the backend would previously fail with an
   "operation not supported" error. This error is now ignored, which means that e.g. an SMB mount
   on macOS can now be used as storage location for a repository.

   https://github.com/restic/restic/issues/2395
   https://forum.restic.net/t/sync-errors-on-mac-over-smb/1859

 * Enhancement #2423: Support user@domain parsing as user

   Added the ability for user@domain-like users to be authenticated over SFTP servers.

   https://github.com/restic/restic/pull/2423

 * Enhancement #2427: Add flag `--iexclude-file` to backup command

   The backup command now supports the flag `--iexclude-file` which is a case-insensitive
   version of `--exclude-file`.

   https://github.com/restic/restic/issues/2427
   https://github.com/restic/restic/pull/2898

 * Enhancement #2569: Support excluding files by their size

   The `backup` command now supports the `--exclude-larger-than` option to exclude files which
   are larger than the specified maximum size. This can for example be useful to exclude
   unimportant files with a large file size.

   https://github.com/restic/restic/issues/2569
   https://github.com/restic/restic/pull/2914

 * Enhancement #2571: Self-heal missing file parts during backup of unchanged files

   We've improved the resilience of restic to certain types of repository corruption.

   For files that are unchanged since the parent snapshot, the backup command now verifies that
   all parts of the files still exist in the repository. Parts that are missing, e.g. from a damaged
   repository, are backed up again. This verification was already run for files that were
   modified since the parent snapshot, but is now also done for unchanged files.

   Note that restic will not backup file parts that are referenced in the index but where the actual
   data is not present on disk, as this situation can only be detected by restic check. Please
   ensure that you run `restic check` regularly.

   https://github.com/restic/restic/issues/2571
   https://github.com/restic/restic/pull/2827

 * Enhancement #2576: Improve the chunking algorithm

   We've updated the chunker library responsible for splitting files into smaller blocks. It
   should improve the chunking throughput by 5-15% depending on the CPU.

   https://github.com/restic/restic/issues/2820
   https://github.com/restic/restic/pull/2576
   https://github.com/restic/restic/pull/2845

 * Enhancement #2598: Improve speed of diff command

   We've improved the performance of the diff command when comparing snapshots with similar
   content. It should run up to twice as fast as before.

   https://github.com/restic/restic/pull/2598

 * Enhancement #2599: Slightly reduce memory usage of prune and stats commands

   The prune and the stats command kept directory identifiers in memory twice while searching for
   used blobs.

   https://github.com/restic/restic/pull/2599

 * Enhancement #2733: S3 backend: Add support for WebIdentityTokenFile

   We've added support for EKS IAM roles for service accounts feature to the S3 backend.

   https://github.com/restic/restic/issues/2703
   https://github.com/restic/restic/pull/2733

 * Enhancement #2773: Optimize handling of new index entries

   Restic now uses less memory for backups which add a lot of data, e.g. large initial backups. In
   addition, we've improved the stability in some edge cases.

   https://github.com/restic/restic/pull/2773

 * Enhancement #2781: Reduce memory consumption of in-memory index

   We've improved how the index is stored in memory. This change can reduce memory usage for large
   repositories by up to 50% (depending on the operation).

   https://github.com/restic/restic/pull/2781
   https://github.com/restic/restic/pull/2812

 * Enhancement #2786: Optimize `list blobs` command

   We've changed the implementation of `list blobs` which should be now a bit faster and consume
   almost no memory even for large repositories.

   https://github.com/restic/restic/pull/2786

 * Enhancement #2790: Optimized file access in restic mount

   Reading large (> 100GiB) files from restic mountpoints is now faster, and the speedup is
   greater for larger files.

   https://github.com/restic/restic/pull/2790

 * Enhancement #2840: Speed-up file deletion in forget, prune and rebuild-index

   We've sped up the file deletion for the commands forget, prune and rebuild-index, especially
   for remote repositories. Deletion was sequential before and is now run in parallel.

   https://github.com/restic/restic/pull/2840

 * Enhancement #2858: Support filtering snapshots by tag and path in the stats command

   We've added filtering snapshots by `--tag tagList` and by `--path path` to the `stats`
   command. This includes filtering of only 'latest' snapshots or all snapshots in a repository.

   https://github.com/restic/restic/issues/2858
   https://github.com/restic/restic/pull/2859
   https://forum.restic.net/t/stats-for-a-host-and-filtered-snapshots/3020


Changelog for restic 0.9.6 (2019-11-22)
=======================================

The following sections list the changes in restic 0.9.6 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #2063: Allow absolute path for filename when backing up from stdin
 * Fix #2174: Save files with invalid timestamps
 * Fix #2249: Read fresh metadata for unmodified files
 * Fix #2301: Add upper bound for t in --read-data-subset=n/t
 * Fix #2321: Check errors when loading index files
 * Enh #2179: Use ctime when checking for file changes
 * Enh #2306: Allow multiple retries for interactive password input
 * Enh #2330: Make `--group-by` accept both singular and plural
 * Enh #2350: Add option to configure S3 region

Details
-------

 * Bugfix #2063: Allow absolute path for filename when backing up from stdin

   When backing up from stdin, handle directory path for `--stdin-filename`. This can be used to
   specify the full path for the backed-up file.

   https://github.com/restic/restic/issues/2063

 * Bugfix #2174: Save files with invalid timestamps

   When restic reads invalid timestamps (year is before 0000 or after 9999) it refused to read and
   archive the file. We've changed the behavior and will now save modified timestamps with the
   year set to either 0000 or 9999, the rest of the timestamp stays the same, so the file will be saved
   (albeit with a bogus timestamp).

   https://github.com/restic/restic/issues/2174
   https://github.com/restic/restic/issues/1173

 * Bugfix #2249: Read fresh metadata for unmodified files

   Restic took all metadata for files which were detected as unmodified, not taking into account
   changed metadata (ownership, mode). This is now corrected.

   https://github.com/restic/restic/issues/2249
   https://github.com/restic/restic/pull/2252

 * Bugfix #2301: Add upper bound for t in --read-data-subset=n/t

   256 is the effective maximum for t, but restic would allow larger values, leading to strange
   behavior.

   https://github.com/restic/restic/issues/2301
   https://github.com/restic/restic/pull/2304

 * Bugfix #2321: Check errors when loading index files

   Restic now checks and handles errors which occur when loading index files, the missing check
   leads to odd errors (and a stack trace printed to users) later. This was reported in the forum.

   https://github.com/restic/restic/pull/2321
   https://forum.restic.net/t/check-rebuild-index-prune/1848/13

 * Enhancement #2179: Use ctime when checking for file changes

   Previously, restic only checked a file's mtime (along with other non-timestamp metadata) to
   decide if a file has changed. This could cause restic to not notice that a file has changed (and
   therefore continue to store the old version, as opposed to the modified version) if something
   edits the file and then resets the timestamp. Restic now also checks the ctime of files, so any
   modifications to a file should be noticed, and the modified file will be backed up. The ctime
   check will be disabled if the --ignore-inode flag was given.

   If this change causes problems for you, please open an issue, and we can look in to adding a
   seperate flag to disable just the ctime check.

   https://github.com/restic/restic/issues/2179
   https://github.com/restic/restic/pull/2212

 * Enhancement #2306: Allow multiple retries for interactive password input

   Restic used to quit if the repository password was typed incorrectly once. Restic will now ask
   the user again for the repository password if typed incorrectly. The user will now get three
   tries to input the correct password before restic quits.

   https://github.com/restic/restic/issues/2306

 * Enhancement #2330: Make `--group-by` accept both singular and plural

   One can now use the values `host`/`hosts`, `path`/`paths` and `tag` / `tags` interchangeably
   in the `--group-by` argument.

   https://github.com/restic/restic/issues/2330

 * Enhancement #2350: Add option to configure S3 region

   We've added a new option for setting the region when accessing an S3-compatible service. For
   some providers, it is required to set this to a valid value. You can do that either by setting the
   environment variable `AWS_DEFAULT_REGION` or using the option `s3.region`, e.g. like this:
   `-o s3.region="us-east-1"`.

   https://github.com/restic/restic/pull/2350


Changelog for restic 0.9.5 (2019-04-23)
=======================================

The following sections list the changes in restic 0.9.5 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #2135: Return error when no bytes could be read from stdin
 * Fix #2181: Don't cancel timeout after 30 seconds for self-update
 * Fix #2203: Fix reading passwords from stdin
 * Fix #2224: Don't abort the find command when a tree can't be loaded
 * Enh #1895: Add case insensitive include & exclude options
 * Enh #1937: Support streaming JSON output for backup
 * Enh #2037: Add group-by option to snapshots command
 * Enh #2124: Ability to dump folders to tar via stdout
 * Enh #2139: Return error if no bytes could be read for `backup --stdin`
 * Enh #2155: Add Openstack application credential auth for Swift
 * Enh #2184: Add --json support to forget command
 * Enh #2205: Add --ignore-inode option to backup cmd
 * Enh #2220: Add config option to set S3 storage class

Details
-------

 * Bugfix #2135: Return error when no bytes could be read from stdin

   We assume that users reading backup data from stdin want to know when no data could be read, so now
   restic returns an error when `backup --stdin` is called but no bytes could be read. Usually,
   this means that an earlier command in a pipe has failed. The documentation was amended and now
   recommends setting the `pipefail` option (`set -o pipefail`).

   https://github.com/restic/restic/pull/2135
   https://github.com/restic/restic/pull/2139

 * Bugfix #2181: Don't cancel timeout after 30 seconds for self-update

   https://github.com/restic/restic/issues/2181

 * Bugfix #2203: Fix reading passwords from stdin

   Passwords for the `init`, `key add`, and `key passwd` commands can now be read from
   non-terminal stdin.

   https://github.com/restic/restic/issues/2203

 * Bugfix #2224: Don't abort the find command when a tree can't be loaded

   Change the find command so that missing trees don't result in a crash. Instead, the error is
   logged to the debug log, and the tree ID is displayed along with the snapshot it belongs to. This
   makes it possible to recover repositories that are missing trees by forgetting the snapshots
   they are used in.

   https://github.com/restic/restic/issues/2224

 * Enhancement #1895: Add case insensitive include & exclude options

   The backup and restore commands now have --iexclude and --iinclude flags as case insensitive
   variants of --exclude and --include.

   https://github.com/restic/restic/issues/1895
   https://github.com/restic/restic/pull/2032

 * Enhancement #1937: Support streaming JSON output for backup

   We've added support for getting machine-readable status output during backup, just pass the
   flag `--json` for `restic backup` and restic will output a stream of JSON objects which contain
   the current progress.

   https://github.com/restic/restic/issues/1937
   https://github.com/restic/restic/pull/1944

 * Enhancement #2037: Add group-by option to snapshots command

   We have added an option to group the output of the snapshots command, similar to the output of the
   forget command. The option has been called "--group-by" and accepts any combination of the
   values "host", "paths" and "tags", separated by commas. Default behavior (not specifying
   --group-by) has not been changed. We have added support of the grouping to the JSON output.

   https://github.com/restic/restic/issues/2037
   https://github.com/restic/restic/pull/2087

 * Enhancement #2124: Ability to dump folders to tar via stdout

   We've added the ability to dump whole folders to stdout via the `dump` command. Restic now
   requires at least Go 1.10 due to a limitation of the standard library for Go <= 1.9.

   https://github.com/restic/restic/issues/2123
   https://github.com/restic/restic/pull/2124

 * Enhancement #2139: Return error if no bytes could be read for `backup --stdin`

   When restic is used to backup the output of a program, like `mysqldump | restic backup --stdin`,
   it now returns an error if no bytes could be read at all. This catches the failure case when
   `mysqldump` failed for some reason and did not output any data to stdout.

   https://github.com/restic/restic/pull/2139

 * Enhancement #2155: Add Openstack application credential auth for Swift

   Since Openstack Queens Identity (auth V3) service supports an application credential auth
   method. It allows to create a technical account with the limited roles. This commit adds an
   application credential authentication method for the Swift backend.

   https://github.com/restic/restic/issues/2155

 * Enhancement #2184: Add --json support to forget command

   The forget command now supports the --json argument, outputting the information about what is
   (or would-be) kept and removed from the repository.

   https://github.com/restic/restic/issues/2184
   https://github.com/restic/restic/pull/2185

 * Enhancement #2205: Add --ignore-inode option to backup cmd

   This option handles backup of virtual filesystems that do not keep fixed inodes for files, like
   Fuse-based, pCloud, etc. Ignoring inode changes allows to consider the file as unchanged if
   last modification date and size are unchanged.

   https://github.com/restic/restic/issues/1631
   https://github.com/restic/restic/pull/2205
   https://github.com/restic/restic/pull/2047

 * Enhancement #2220: Add config option to set S3 storage class

   The `s3.storage-class` option can be passed to restic (using `-o`) to specify the storage
   class to be used for S3 objects created by restic.

   The storage class is passed as-is to S3, so it needs to be understood by the API. On AWS, it can be
   one of `STANDARD`, `STANDARD_IA`, `ONEZONE_IA`, `INTELLIGENT_TIERING` and
   `REDUCED_REDUNDANCY`. If unspecified, the default storage class is used (`STANDARD` on
   AWS).

   You can mix storage classes in the same bucket, and the setting isn't stored in the restic
   repository, so be sure to specify it with each command that writes to S3.

   https://github.com/restic/restic/issues/706
   https://github.com/restic/restic/pull/2220


Changelog for restic 0.9.4 (2019-01-06)
=======================================

The following sections list the changes in restic 0.9.4 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1989: Google Cloud Storage: Respect bandwidth limit
 * Fix #2040: Add host name filter shorthand flag for `stats` command
 * Fix #2068: Correctly return error loading data
 * Fix #2095: Consistently use local time for snapshots times
 * Enh #1605: Concurrent restore
 * Enh #2017: Mount: Enforce FUSE Unix permissions with allow-other
 * Enh #2070: Make all commands display timestamps in local time
 * Enh #2085: Allow --files-from to be specified multiple times
 * Enh #2089: Increase granularity of the "keep within" retention policy
 * Enh #2094: Run command to get password
 * Enh #2097: Add key hinting

Details
-------

 * Bugfix #1989: Google Cloud Storage: Respect bandwidth limit

   The GCS backend did not respect the bandwidth limit configured, a previous commit
   accidentally removed support for it.

   https://github.com/restic/restic/issues/1989
   https://github.com/restic/restic/pull/2100

 * Bugfix #2040: Add host name filter shorthand flag for `stats` command

   The default value for `--host` flag was set to 'H' (the shorthand version of the flag), this
   caused the lookup for the latest snapshot to fail.

   Add shorthand flag `-H` for `--host` (with empty default so if these flags are not specified the
   latest snapshot will not filter by host name).

   Also add shorthand `-H` for `backup` command.

   https://github.com/restic/restic/issues/2040

 * Bugfix #2068: Correctly return error loading data

   In one case during `prune` and `check`, an error loading data from the backend is not returned
   properly. This is now corrected.

   https://github.com/restic/restic/issues/1999#issuecomment-433737921
   https://github.com/restic/restic/pull/2068

 * Bugfix #2095: Consistently use local time for snapshots times

   By default snapshots created with restic backup were set to local time, but when the --time flag
   was used the provided timestamp was parsed as UTC. With this change all snapshots times are set
   to local time.

   https://github.com/restic/restic/pull/2095

 * Enhancement #1605: Concurrent restore

   This change significantly improves restore performance, especially when using
   high-latency remote repositories like B2.

   The implementation now uses several concurrent threads to download and process multiple
   remote files concurrently. To further reduce restore time, each remote file is downloaded
   using a single repository request.

   https://github.com/restic/restic/issues/1605
   https://github.com/restic/restic/pull/1719

 * Enhancement #2017: Mount: Enforce FUSE Unix permissions with allow-other

   The fuse mount (`restic mount`) now lets the kernel check the permissions of the files within
   snapshots (this is done through the `DefaultPermissions` FUSE option) when the option
   `--allow-other` is specified.

   To restore the old behavior, we've added the `--no-default-permissions` option. This allows
   all users that have access to the mount point to access all files within the snapshots.

   https://github.com/restic/restic/pull/2017

 * Enhancement #2070: Make all commands display timestamps in local time

   Restic used to drop the timezone information from displayed timestamps, it now converts
   timestamps to local time before printing them so the times can be easily compared to.

   https://github.com/restic/restic/pull/2070

 * Enhancement #2085: Allow --files-from to be specified multiple times

   Before, restic took only the last file specified with `--files-from` into account, this is now
   corrected.

   https://github.com/restic/restic/issues/2085
   https://github.com/restic/restic/pull/2086

 * Enhancement #2089: Increase granularity of the "keep within" retention policy

   The `keep-within` option of the `forget` command now accepts time ranges with an hourly
   granularity. For example, running `restic forget --keep-within 3d12h` will keep all the
   snapshots made within three days and twelve hours from the time of the latest snapshot.

   https://github.com/restic/restic/issues/2089
   https://github.com/restic/restic/pull/2090

 * Enhancement #2094: Run command to get password

   We've added the `--password-command` option which allows specifying a command that restic
   runs every time the password for the repository is needed, so it can be integrated with a
   password manager or keyring. The option can also be set via the environment variable
   `$RESTIC_PASSWORD_COMMAND`.

   https://github.com/restic/restic/pull/2094

 * Enhancement #2097: Add key hinting

   Added a new option `--key-hint` and corresponding environment variable `RESTIC_KEY_HINT`.
   The key hint is a key ID to try decrypting first, before other keys in the repository.

   This change will benefit repositories with many keys; if the correct key hint is supplied then
   restic only needs to check one key. If the key hint is incorrect (the key does not exist, or the
   password is incorrect) then restic will check all keys, as usual.

   https://github.com/restic/restic/issues/2097


Changelog for restic 0.9.3 (2018-10-13)
=======================================

The following sections list the changes in restic 0.9.3 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1935: Remove truncated files from cache
 * Fix #1978: Do not return an error when the scanner is slower than backup
 * Enh #1766: Restore: suppress lchown errors when not running as root
 * Enh #1777: Improve the `find` command
 * Enh #1876: Display reason why forget keeps snapshots
 * Enh #1891: Accept glob in paths loaded via --files-from
 * Enh #1909: Reject files/dirs by name first
 * Enh #1920: Vendor dependencies with Go 1.11 Modules
 * Enh #1940: Add directory filter to ls command
 * Enh #1949: Add new command `self-update`
 * Enh #1953: Ls: Add JSON output support for restic ls cmd
 * Enh #1962: Stream JSON output for ls command
 * Enh #1967: Use `--host` everywhere
 * Enh #2028: Display size of cache directories

Details
-------

 * Bugfix #1935: Remove truncated files from cache

   When a file in the local cache is truncated, and restic tries to access data beyond the end of the
   (cached) file, it used to return an error "EOF". This is now fixed, such truncated files are
   removed and the data is fetched directly from the backend.

   https://github.com/restic/restic/issues/1935

 * Bugfix #1978: Do not return an error when the scanner is slower than backup

   When restic makes a backup, there's a background task called "scanner" which collects
   information on how many files and directories are to be saved, in order to display progress
   information to the user. When the backup finishes faster than the scanner, it is aborted
   because the result is not needed any more. This logic contained a bug, where quitting the
   scanner process was treated as an error, and caused restic to print an unhelpful error message
   ("context canceled").

   https://github.com/restic/restic/issues/1978
   https://github.com/restic/restic/pull/1991

 * Enhancement #1766: Restore: suppress lchown errors when not running as root

   Like "cp" and "rsync" do, restic now only reports errors for changing the ownership of files
   during restore if it is run as root, on non-Windows operating systems. On Windows, the error
   is reported as usual.

   https://github.com/restic/restic/issues/1766

 * Enhancement #1777: Improve the `find` command

   We've updated the `find` command to support multiple patterns.

   `restic find` is now able to list the snapshots containing a specific tree or blob, or even the
   snapshots that contain blobs belonging to a given pack. A list of IDs can be given, as long as they
   all have the same type.

   The command `find` can also display the pack IDs the blobs belong to, if the `--show-pack-id`
   flag is provided.

   https://github.com/restic/restic/issues/1777
   https://github.com/restic/restic/pull/1780

 * Enhancement #1876: Display reason why forget keeps snapshots

   We've added a column to the list of snapshots `forget` keeps which details the reasons to keep a
   particuliar snapshot. This makes debugging policies for forget much easier. Please remember
   to always try things out with `--dry-run`!

   https://github.com/restic/restic/pull/1876

 * Enhancement #1891: Accept glob in paths loaded via --files-from

   Before that, behaviour was different if paths were appended to command line or from a file,
   because wild card characters were expanded by shell if appended to command line, but not
   expanded if loaded from file.

   https://github.com/restic/restic/issues/1891

 * Enhancement #1909: Reject files/dirs by name first

   The current scanner/archiver code had an architectural limitation: it always ran the
   `lstat()` system call on all files and directories before a decision to include/exclude the
   file/dir was made. This lead to a lot of unnecessary system calls for items that could have been
   rejected by their name or path only.

   We've changed the archiver/scanner implementation so that it now first rejects by name/path,
   and only runs the system call on the remaining items. This reduces the number of `lstat()`
   system calls a lot (depending on the exclude settings).

   https://github.com/restic/restic/issues/1909
   https://github.com/restic/restic/pull/1912

 * Enhancement #1920: Vendor dependencies with Go 1.11 Modules

   Until now, we've used `dep` for managing dependencies, we've now switch to using Go modules.
   For users this does not change much, only if you want to compile restic without downloading
   anything with Go 1.11, then you need to run: `go build -mod=vendor build.go`

   https://github.com/restic/restic/pull/1920

 * Enhancement #1940: Add directory filter to ls command

   The ls command can now be filtered by directories, so that only files in the given directories
   will be shown. If the --recursive flag is specified, then ls will traverse subfolders and list
   their files as well.

   It used to be possible to specify multiple snapshots, but that has been replaced by only one
   snapshot and the possibility of specifying multiple directories.

   Specifying directories constrains the walk, which can significantly speed up the listing.

   https://github.com/restic/restic/issues/1940
   https://github.com/restic/restic/pull/1941

 * Enhancement #1949: Add new command `self-update`

   We have added a new command called `self-update` which downloads the latest released version
   of restic from GitHub and replaces the current binary with it. It does not rely on any external
   program (so it'll work everywhere), but still verifies the GPG signature using the embedded
   GPG public key.

   By default, the `self-update` command is hidden behind the `selfupdate` built tag, which is
   only set when restic is built using `build.go` (including official releases). The reason for
   this is that downstream distributions will then not include the command by default, so users
   are encouraged to use the platform-specific distribution mechanism.

   https://github.com/restic/restic/pull/1949

 * Enhancement #1953: Ls: Add JSON output support for restic ls cmd

   We've implemented listing files in the repository with JSON as output, just pass `--json` as an
   option to `restic ls`. This makes the output of the command machine readable.

   https://github.com/restic/restic/pull/1953

 * Enhancement #1962: Stream JSON output for ls command

   The `ls` command now supports JSON output with the global `--json` flag, and this change
   streams out JSON messages one object at a time rather than en entire array buffered in memory
   before encoding. The advantage is it allows large listings to be handled efficiently.

   Two message types are printed: snapshots and nodes. A snapshot object will precede node
   objects which belong to that snapshot. The `struct_type` field can be used to determine which
   kind of message an object is.

   https://github.com/restic/restic/pull/1962

 * Enhancement #1967: Use `--host` everywhere

   We now use the flag `--host` for all commands which need a host name, using `--hostname` (e.g.
   for `restic backup`) still works, but will print a deprecation warning. Also, add the short
   option `-H` where possible.

   https://github.com/restic/restic/issues/1967

 * Enhancement #2028: Display size of cache directories

   The `cache` command now by default shows the size of the individual cache directories. It can be
   disabled with `--no-size`.

   https://github.com/restic/restic/issues/2028
   https://github.com/restic/restic/pull/2033


Changelog for restic 0.9.2 (2018-08-06)
=======================================

The following sections list the changes in restic 0.9.2 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1854: Allow saving files/dirs on different fs with `--one-file-system`
 * Fix #1861: Fix case-insensitive search with restic find
 * Fix #1870: Fix restore with --include
 * Fix #1880: Use `--cache-dir` argument for `check` command
 * Fix #1893: Return error when exclude file cannot be read
 * Enh #874: Add stats command to get information about a repository
 * Enh #1477: S3 backend: accept AWS_SESSION_TOKEN
 * Enh #1772: Add restore --verify to verify restored file content
 * Enh #1853: Add JSON output support to `restic key list`
 * Enh #1901: Update the Backblaze B2 library
 * Enh #1906: Add support for B2 application keys

Details
-------

 * Bugfix #1854: Allow saving files/dirs on different fs with `--one-file-system`

   Restic now allows saving files/dirs on a different file system in a subdir correctly even when
   `--one-file-system` is specified.

   The first thing the restic archiver code does is to build a tree of the target
   files/directories. If it detects that a parent directory is already included (e.g. `restic
   backup /foo /foo/bar/baz`), it'll ignore the latter argument.

   Without `--one-file-system`, that's perfectly valid: If `/foo` is to be archived, it will
   include `/foo/bar/baz`. But with `--one-file-system`, `/foo/bar/baz` may reside on a
   different file system, so it won't be included with `/foo`.

   https://github.com/restic/restic/issues/1854
   https://github.com/restic/restic/pull/1855

 * Bugfix #1861: Fix case-insensitive search with restic find

   We've fixed the behavior for `restic find -i PATTERN`, which was broken in v0.9.1.

   https://github.com/restic/restic/pull/1861

 * Bugfix #1870: Fix restore with --include

   We fixed a bug which prevented restic to restore files with an include filter.

   https://github.com/restic/restic/issues/1870
   https://github.com/restic/restic/pull/1900

 * Bugfix #1880: Use `--cache-dir` argument for `check` command

   `check` command now uses a temporary sub-directory of the specified directory if set using the
   `--cache-dir` argument. If not set, the cache directory is created in the default temporary
   directory as before. In either case a temporary cache is used to ensure the actual repository is
   checked (rather than a local copy).

   The `--cache-dir` argument was not used by the `check` command, instead a cache directory was
   created in the temporary directory.

   https://github.com/restic/restic/issues/1880

 * Bugfix #1893: Return error when exclude file cannot be read

   A bug was found: when multiple exclude files were passed to restic and one of them could not be
   read, an error was printed and restic continued, ignoring even the existing exclude files.
   Now, an error message is printed and restic aborts when an exclude file cannot be read.

   https://github.com/restic/restic/issues/1893

 * Enhancement #874: Add stats command to get information about a repository

   https://github.com/restic/restic/issues/874
   https://github.com/restic/restic/pull/1729

 * Enhancement #1477: S3 backend: accept AWS_SESSION_TOKEN

   Before, it was not possible to use s3 backend with AWS temporary security credentials(with
   AWS_SESSION_TOKEN). This change gives higher priority to credentials.EnvAWS credentials
   provider.

   https://github.com/restic/restic/issues/1477
   https://github.com/restic/restic/pull/1479
   https://github.com/restic/restic/pull/1647

 * Enhancement #1772: Add restore --verify to verify restored file content

   Restore will print error message if restored file content does not match expected SHA256
   checksum

   https://github.com/restic/restic/pull/1772

 * Enhancement #1853: Add JSON output support to `restic key list`

   This PR enables users to get the output of `restic key list` in JSON in addition to the existing
   table format.

   https://github.com/restic/restic/pull/1853

 * Enhancement #1901: Update the Backblaze B2 library

   We've updated the library we're using for accessing the Backblaze B2 service to 0.5.0 to
   include support for upcoming so-called "application keys". With this feature, you can create
   access credentials for B2 which are restricted to e.g. a single bucket or even a sub-directory
   of a bucket.

   https://github.com/restic/restic/pull/1901
   https://github.com/kurin/blazer

 * Enhancement #1906: Add support for B2 application keys

   Restic can now use so-called "application keys" which can be created in the B2 dashboard and
   were only introduced recently. In contrast to the "master key", such keys can be restricted to a
   specific bucket and/or path.

   https://github.com/restic/restic/issues/1906
   https://github.com/restic/restic/pull/1914


Changelog for restic 0.9.1 (2018-06-10)
=======================================

The following sections list the changes in restic 0.9.1 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1801: Add limiting bandwidth to the rclone backend
 * Fix #1822: Allow uploading large files to MS Azure
 * Fix #1825: Correct `find` to not skip snapshots
 * Fix #1833: Fix caching files on error
 * Fix #1834: Resolve deadlock

Details
-------

 * Bugfix #1801: Add limiting bandwidth to the rclone backend

   The rclone backend did not respect `--limit-upload` or `--limit-download`. Oftentimes it's
   not necessary to use this, as the limiting in rclone itself should be used because it gives much
   better results, but in case a remote instance of rclone is used (e.g. called via ssh), it is still
   relevant to limit the bandwidth from restic to rclone.

   https://github.com/restic/restic/issues/1801

 * Bugfix #1822: Allow uploading large files to MS Azure

   Sometimes, restic creates files to be uploaded to the repository which are quite large, e.g.
   when saving directories with many entries or very large files. The MS Azure API does not allow
   uploading files larger that 256MiB directly, rather restic needs to upload them in blocks of
   100MiB. This is now implemented.

   https://github.com/restic/restic/issues/1822

 * Bugfix #1825: Correct `find` to not skip snapshots

   Under certain circumstances, the `find` command was found to skip snapshots containing
   directories with files to look for when the directories haven't been modified at all, and were
   already printed as part of a different snapshot. This is now corrected.

   In addition, we've switched to our own matching/pattern implementation, so now things like
   `restic find "/home/user/foo/**/main.go"` are possible.

   https://github.com/restic/restic/issues/1825
   https://github.com/restic/restic/issues/1823

 * Bugfix #1833: Fix caching files on error

   During `check` it may happen that different threads access the same file in the backend, which
   is then downloaded into the cache only once. When that fails, only the thread which is
   responsible for downloading the file signals the correct error. The other threads just assume
   that the file has been downloaded successfully and then get an error when they try to access the
   cached file.

   https://github.com/restic/restic/issues/1833

 * Bugfix #1834: Resolve deadlock

   When the "scanning" process restic runs to find out how much data there is does not finish before
   the backup itself is done, restic stops doing anything. This is resolved now.

   https://github.com/restic/restic/issues/1834
   https://github.com/restic/restic/pull/1835


Changelog for restic 0.9.0 (2018-05-21)
=======================================

The following sections list the changes in restic 0.9.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1608: Respect time stamp for new backup when reading from stdin
 * Fix #1652: Ignore/remove invalid lock files
 * Fix #1684: Fix backend tests for rest-server
 * Fix #1730: Ignore sockets for restore
 * Fix #1745: Correctly parse the argument to --tls-client-cert
 * Enh #549: Rework archiver code
 * Enh #827: Add --new-password-file flag for non-interactive password changes
 * Enh #1433: Support UTF-16 encoding and process Byte Order Mark
 * Enh #1477: Accept AWS_SESSION_TOKEN for the s3 backend
 * Enh #1552: Use Google Application Default credentials
 * Enh #1561: Allow using rclone to access other services
 * Enh #1648: Ignore AWS permission denied error when creating a repository
 * Enh #1649: Add illumos/Solaris support
 * Enh #1665: Improve cache handling for `restic check`
 * Enh #1709: Improve messages `restic check` prints
 * Enh #1721: Add `cache` command to list cache dirs
 * Enh #1735: Allow keeping a time range of snaphots
 * Enh #1758: Allow saving OneDrive folders in Windows
 * Enh #1782: Use default AWS credentials chain for S3 backend

Details
-------

 * Bugfix #1608: Respect time stamp for new backup when reading from stdin

   When reading backups from stdin (via `restic backup --stdin`), restic now uses the time stamp
   for the new backup passed in `--time`.

   https://github.com/restic/restic/issues/1608
   https://github.com/restic/restic/pull/1703

 * Bugfix #1652: Ignore/remove invalid lock files

   This corrects a bug introduced recently: When an invalid lock file in the repo is encountered
   (e.g. if the file is empty), the code used to ignore that, but now returns the error. Now, invalid
   files are ignored for the normal lock check, and removed when `restic unlock --remove-all` is
   run.

   https://github.com/restic/restic/issues/1652
   https://github.com/restic/restic/pull/1653

 * Bugfix #1684: Fix backend tests for rest-server

   The REST server for restic now requires an explicit parameter (`--no-auth`) if no
   authentication should be allowed. This is fixed in the tests.

   https://github.com/restic/restic/pull/1684

 * Bugfix #1730: Ignore sockets for restore

   We've received a report and correct the behavior in which the restore code aborted restoring a
   directory when a socket was encountered. Unix domain socket files cannot be restored (they are
   created on the fly once a process starts listening). The error handling was corrected, and in
   addition we're now ignoring sockets during restore.

   https://github.com/restic/restic/issues/1730
   https://github.com/restic/restic/pull/1731

 * Bugfix #1745: Correctly parse the argument to --tls-client-cert

   Previously, the --tls-client-cert method attempt to read ARGV[1] (hardcoded) instead of the
   argument that was passed to it. This has been corrected.

   https://github.com/restic/restic/issues/1745
   https://github.com/restic/restic/pull/1746

 * Enhancement #549: Rework archiver code

   The core archiver code and the complementary code for the `backup` command was rewritten
   completely. This resolves very annoying issues such as 549. The first backup with this release
   of restic will likely result in all files being re-read locally, so it will take a lot longer. The
   next backup after that will be fast again.

   Basically, with the old code, restic took the last path component of each to-be-saved file or
   directory as the top-level file/directory within the snapshot. This meant that when called as
   `restic backup /home/user/foo`, the snapshot would contain the files in the directory
   `/home/user/foo` as `/foo`.

   This is not the case any more with the new archiver code. Now, restic works very similar to what
   `tar` does: When restic is called with an absolute path to save, then it'll preserve the
   directory structure within the snapshot. For the example above, the snapshot would contain
   the files in the directory within `/home/user/foo` in the snapshot. For relative
   directories, it only preserves the relative path components. So `restic backup user/foo`
   will save the files as `/user/foo` in the snapshot.

   While we were at it, the status display and notification system was completely rewritten. By
   default, restic now shows which files are currently read (unless `--quiet` is specified) in a
   multi-line status display.

   The `backup` command also gained a new option: `--verbose`. It can be specified once (which
   prints a bit more detail what restic is doing) or twice (which prints a line for each
   file/directory restic encountered, together with some statistics).

   Another issue that was resolved is the new code only reads two files at most. The old code would
   read way too many files in parallel, thereby slowing down the backup process on spinning discs a
   lot.

   https://github.com/restic/restic/issues/549
   https://github.com/restic/restic/issues/1286
   https://github.com/restic/restic/issues/446
   https://github.com/restic/restic/issues/1344
   https://github.com/restic/restic/issues/1416
   https://github.com/restic/restic/issues/1456
   https://github.com/restic/restic/issues/1145
   https://github.com/restic/restic/issues/1160
   https://github.com/restic/restic/pull/1494

 * Enhancement #827: Add --new-password-file flag for non-interactive password changes

   This makes it possible to change a repository password without being prompted.

   https://github.com/restic/restic/issues/827
   https://github.com/restic/restic/pull/1720
   https://forum.restic.net/t/changing-repo-password-without-prompt/591

 * Enhancement #1433: Support UTF-16 encoding and process Byte Order Mark

   On Windows, text editors commonly leave a Byte Order Mark at the beginning of the file to define
   which encoding is used (oftentimes UTF-16). We've added code to support processing the BOMs in
   text files, like the exclude files, the password file and the file passed via `--files-from`.
   This does not apply to any file being saved in a backup, those are not touched and archived as they
   are.

   https://github.com/restic/restic/issues/1433
   https://github.com/restic/restic/issues/1738
   https://github.com/restic/restic/pull/1748

 * Enhancement #1477: Accept AWS_SESSION_TOKEN for the s3 backend

   Before, it was not possible to use s3 backend with AWS temporary security credentials(with
   AWS_SESSION_TOKEN). This change gives higher priority to credentials.EnvAWS credentials
   provider.

   https://github.com/restic/restic/issues/1477
   https://github.com/restic/restic/pull/1479
   https://github.com/restic/restic/pull/1647

 * Enhancement #1552: Use Google Application Default credentials

   Google provide libraries to generate appropriate credentials with various fallback
   sources. This change uses the library to generate our GCS client, which allows us to make use of
   these extra methods.

   This should be backward compatible with previous restic behaviour while adding the
   additional capabilities to auth from Google's internal metadata endpoints. For users
   running restic in GCP this can make authentication far easier than it was before.

   https://github.com/restic/restic/pull/1552
   https://developers.google.com/identity/protocols/application-default-credentials

 * Enhancement #1561: Allow using rclone to access other services

   We've added the ability to use rclone to store backup data on all backends that it supports. This
   was done in collaboration with Nick, the author of rclone. You can now use it to first configure a
   service, then restic manages the rest (starting and stopping rclone). For details, please see
   the manual.

   https://github.com/restic/restic/issues/1561
   https://github.com/restic/restic/pull/1657
   https://rclone.org

 * Enhancement #1648: Ignore AWS permission denied error when creating a repository

   It's not possible to use s3 backend scoped to a subdirectory(with specific permissions).
   Restic doesn't try to create repository in a subdirectory, when 'bucket exists' of parent
   directory check fails due to permission issues.

   https://github.com/restic/restic/pull/1648

 * Enhancement #1649: Add illumos/Solaris support

   https://github.com/restic/restic/pull/1649

 * Enhancement #1665: Improve cache handling for `restic check`

   For safety reasons, restic does not use a local metadata cache for the `restic check` command,
   so that data is loaded from the repository and restic can check it's in good condition. When the
   cache is disabled, restic will fetch each tiny blob needed for checking the integrity using a
   separate backend request. For non-local backends, that will take a long time, and depending on
   the backend (e.g. B2) may also be much more expensive.

   This PR adds a few commits which will change the behavior as follows:

   * When `restic check` is called without any additional parameters, it will build a new cache in a
   temporary directory, which is removed at the end of the check. This way, we'll get readahead for
   metadata files (so restic will fetch the whole file when the first blob from the file is
   requested), but all data is freshly fetched from the storage backend. This is the default
   behavior and will work for almost all users.

   * When `restic check` is called with `--with-cache`, the default on-disc cache is used. This
   behavior hasn't changed since the cache was introduced.

   * When `--no-cache` is specified, restic falls back to the old behavior, and read all tiny blobs
   in separate requests.

   https://github.com/restic/restic/issues/1665
   https://github.com/restic/restic/issues/1694
   https://github.com/restic/restic/pull/1696

 * Enhancement #1709: Improve messages `restic check` prints

   Some messages `restic check` prints are not really errors, so from now on restic does not treat
   them as errors any more and exits cleanly.

   https://github.com/restic/restic/pull/1709
   https://forum.restic.net/t/what-is-the-standard-procedure-to-follow-if-a-backup-or-restore-is-interrupted/571/2

 * Enhancement #1721: Add `cache` command to list cache dirs

   The command `cache` was added, it allows listing restic's cache directoriers together with
   the last usage. It also allows removing old cache dirs without having to access a repo, via
   `restic cache --cleanup`

   https://github.com/restic/restic/issues/1721
   https://github.com/restic/restic/pull/1749

 * Enhancement #1735: Allow keeping a time range of snaphots

   We've added the `--keep-within` option to the `forget` command. It instructs restic to keep
   all snapshots within the given duration since the newest snapshot. For example, running
   `restic forget --keep-within 5m7d` will keep all snapshots which have been made in the five
   months and seven days since the latest snapshot.

   https://github.com/restic/restic/pull/1735

 * Enhancement #1758: Allow saving OneDrive folders in Windows

   Restic now contains a bugfix to two libraries, which allows saving OneDrive folders in
   Windows. In order to use the newer versions of the libraries, the minimal version required to
   compile restic is now Go 1.9.

   https://github.com/restic/restic/issues/1758
   https://github.com/restic/restic/pull/1765

 * Enhancement #1782: Use default AWS credentials chain for S3 backend

   Adds support for file credentials to the S3 backend (e.g. ~/.aws/credentials), and reorders
   the credentials chain for the S3 backend to match AWS's standard, which is static credentials,
   env vars, credentials file, and finally remote.

   https://github.com/restic/restic/pull/1782


Changelog for restic 0.8.3 (2018-02-26)
=======================================

The following sections list the changes in restic 0.8.3 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1633: Fixed unexpected 'pack file cannot be listed' error
 * Fix #1638: Handle errors listing files in the backend
 * Fix #1641: Ignore files with invalid names in the repo
 * Enh #1497: Add --read-data-subset flag to check command
 * Enh #1560: Retry all repository file download errors
 * Enh #1623: Don't check for presence of files in the backend before writing
 * Enh #1634: Upgrade B2 client library, reduce HTTP requests

Details
-------

 * Bugfix #1633: Fixed unexpected 'pack file cannot be listed' error

   Due to a regression introduced in 0.8.2, the `rebuild-index` and `prune` commands failed to
   read pack files with size of 587, 588, 589 or 590 bytes.

   https://github.com/restic/restic/issues/1633
   https://github.com/restic/restic/pull/1635

 * Bugfix #1638: Handle errors listing files in the backend

   A user reported in the forum that restic completes a backup although a concurrent `prune`
   operation was running. A few error messages were printed, but the backup was attempted and
   completed successfully. No error code was returned.

   This should not happen: The repository is exclusively locked during `prune`, so when `restic
   backup` is run in parallel, it should abort and return an error code instead.

   It was found that the bug was in the code introduced only recently, which retries a List()
   operation on the backend should that fail. It is now corrected.

   https://github.com/restic/restic/pull/1638
   https://forum.restic.net/t/restic-backup-returns-0-exit-code-when-already-locked/484

 * Bugfix #1641: Ignore files with invalid names in the repo

   The release 0.8.2 introduced a bug: when restic encounters files in the repo which do not have a
   valid name, it tries to load a file with a name of lots of zeroes instead of ignoring it. This is now
   resolved, invalid file names are just ignored.

   https://github.com/restic/restic/issues/1641
   https://github.com/restic/restic/pull/1643
   https://forum.restic.net/t/help-fixing-repo-no-such-file/485/3

 * Enhancement #1497: Add --read-data-subset flag to check command

   This change introduces ability to check integrity of a subset of repository data packs. This
   can be used to spread integrity check of larger repositories over a period of time.

   https://github.com/restic/restic/issues/1497
   https://github.com/restic/restic/pull/1556

 * Enhancement #1560: Retry all repository file download errors

   Restic will now retry failed downloads, similar to other operations.

   https://github.com/restic/restic/pull/1560

 * Enhancement #1623: Don't check for presence of files in the backend before writing

   Before, all backend implementations were required to return an error if the file that is to be
   written already exists in the backend. For most backends, that means making a request (e.g. via
   HTTP) and returning an error when the file already exists.

   This is not accurate, the file could have been created between the HTTP request testing for it,
   and when writing starts, so we've relaxed this requeriment, which saves one additional HTTP
   request per newly added file.

   https://github.com/restic/restic/pull/1623

 * Enhancement #1634: Upgrade B2 client library, reduce HTTP requests

   We've upgraded the B2 client library restic uses to access BackBlaze B2. This reduces the
   number of HTTP requests needed to upload a new file from two to one, which should improve
   throughput to B2.

   https://github.com/restic/restic/pull/1634


Changelog for restic 0.8.2 (2018-02-17)
=======================================

The following sections list the changes in restic 0.8.2 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1506: Limit bandwith at the http.RoundTripper for HTTP based backends
 * Fix #1512: Restore directory permissions as the last step
 * Fix #1528: Correctly create missing subdirs in data/
 * Fix #1589: Complete intermediate index upload
 * Fix #1590: Strip spaces for lines read via --files-from
 * Fix #1594: Google Cloud Storage: Use generic HTTP transport
 * Fix #1595: Backup: Remove bandwidth display
 * Enh #1507: Only reload snapshots once per minute for fuse mount
 * Enh #1522: Add support for TLS client certificate authentication
 * Enh #1538: Reduce memory allocations for querying the index
 * Enh #1541: Reduce number of remote requests during repository check
 * Enh #1549: Speed up querying across indices and scanning existing files
 * Enh #1554: Fuse/mount: Correctly handle EOF, add template option
 * Enh #1564: Don't terminate ssh on SIGINT
 * Enh #1567: Reduce number of backend requests for rebuild-index and prune
 * Enh #1579: Retry Backend.List() in case of errors
 * Enh #1584: Limit index file size

Details
-------

 * Bugfix #1506: Limit bandwith at the http.RoundTripper for HTTP based backends

   https://github.com/restic/restic/issues/1506
   https://github.com/restic/restic/pull/1511

 * Bugfix #1512: Restore directory permissions as the last step

   This change allows restoring into directories that were not writable during backup. Before,
   restic created the directory, set the read-only mode and then failed to create files in the
   directory. This change now restores the directory (with its permissions) as the very last
   step.

   https://github.com/restic/restic/issues/1512
   https://github.com/restic/restic/pull/1536

 * Bugfix #1528: Correctly create missing subdirs in data/

   https://github.com/restic/restic/issues/1528
   https://github.com/restic/restic/pull/1529

 * Bugfix #1589: Complete intermediate index upload

   After a user posted a comprehensive report of what he observed, we were able to find a bug and
   correct it: During backup, restic uploads so-called "intermediate" index files. When the
   backup finishes during a transfer of such an intermediate index, the upload is cancelled, but
   the backup is finished without an error. This leads to an inconsistent state, where the
   snapshot references data that is contained in the repo, but is not referenced in any index.

   The situation can be resolved by building a new index with `rebuild-index`, but looks very
   confusing at first. Since all the data got uploaded to the repo successfully, there was no risk
   of data loss, just minor inconvenience for our users.

   https://github.com/restic/restic/pull/1589
   https://forum.restic.net/t/error-loading-tree-check-prune-and-forget-gives-error-b2-backend/406

 * Bugfix #1590: Strip spaces for lines read via --files-from

   Leading and trailing spaces in lines read via `--files-from` are now stripped, so it behaves
   the same as with lines read via `--exclude-file`.

   https://github.com/restic/restic/issues/1590
   https://github.com/restic/restic/pull/1613

 * Bugfix #1594: Google Cloud Storage: Use generic HTTP transport

   It was discovered that the Google Cloud Storage backend did not use the generic HTTP transport,
   so things such as bandwidth limiting with `--limit-upload` did not work. This is resolved now.

   https://github.com/restic/restic/pull/1594

 * Bugfix #1595: Backup: Remove bandwidth display

   This commit removes the bandwidth displayed during backup process. It is misleading and
   seldomly correct, because it's neither the "read bandwidth" (only for the very first backup)
   nor the "upload bandwidth". Many users are confused about (and rightly so), c.f. #1581, #1033,
   #1591

   We'll eventually replace this display with something more relevant when the new archiver code
   is ready.

   https://github.com/restic/restic/pull/1595

 * Enhancement #1507: Only reload snapshots once per minute for fuse mount

   https://github.com/restic/restic/pull/1507

 * Enhancement #1522: Add support for TLS client certificate authentication

   Support has been added for using a TLS client certificate for authentication to HTTP based
   backend. A file containing the PEM encoded private key and certificate can be set using the
   `--tls-client-cert` option.

   https://github.com/restic/restic/issues/1522
   https://github.com/restic/restic/pull/1524

 * Enhancement #1538: Reduce memory allocations for querying the index

   This change reduces the internal memory allocations when the index data structures in memory
   are queried if a blob (part of a file) already exists in the repo. It should speed up backup a bit,
   and maybe even reduce RAM usage.

   https://github.com/restic/restic/pull/1538

 * Enhancement #1541: Reduce number of remote requests during repository check

   This change eliminates redundant remote repository calls and significantly improves
   repository check time.

   https://github.com/restic/restic/issues/1541
   https://github.com/restic/restic/pull/1548

 * Enhancement #1549: Speed up querying across indices and scanning existing files

   This change increases the whenever a blob (part of a file) is searched for in a restic
   repository. This will reduce cpu usage some when backing up files already backed up by restic.
   Cpu usage is further decreased when scanning files.

   https://github.com/restic/restic/pull/1549

 * Enhancement #1554: Fuse/mount: Correctly handle EOF, add template option

   We've added the `--snapshot-template` string, which can be used to specify a template for a
   snapshot directory. In addition, accessing data after the end of a file via the fuse mount is now
   handled correctly.

   https://github.com/restic/restic/pull/1554

 * Enhancement #1564: Don't terminate ssh on SIGINT

   We've reworked the code which runs the `ssh` login for the sftp backend so that it can prompt for a
   password (if needed) but does not exit when the user presses CTRL+C (SIGINT) e.g. during
   backup. This allows restic to properly shut down when it receives SIGINT and remove the lock
   file from the repo, afterwards exiting the `ssh` process.

   https://github.com/restic/restic/pull/1564
   https://github.com/restic/restic/pull/1588

 * Enhancement #1567: Reduce number of backend requests for rebuild-index and prune

   We've found a way to reduce then number of backend requests for the `rebuild-index` and `prune`
   operations. This significantly speeds up the operations for high-latency backends.

   https://github.com/restic/restic/issues/1567
   https://github.com/restic/restic/pull/1574
   https://github.com/restic/restic/pull/1575

 * Enhancement #1579: Retry Backend.List() in case of errors

   https://github.com/restic/restic/pull/1579

 * Enhancement #1584: Limit index file size

   Before, restic would create a single new index file on `prune` or `rebuild-index`, this may
   lead to memory problems when this huge index is created and loaded again. We're now limiting the
   size of the index file, and split newly created index files into several smaller ones. This
   allows restic to be more memory-efficient.

   https://github.com/restic/restic/issues/1412
   https://github.com/restic/restic/issues/979
   https://github.com/restic/restic/issues/526
   https://github.com/restic/restic/pull/1584


Changelog for restic 0.8.1 (2017-12-27)
=======================================

The following sections list the changes in restic 0.8.1 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1454: Correct cache dir location for Windows and Darwin
 * Fix #1457: Improve s3 backend with DigitalOcean Spaces
 * Fix #1459: Disable handling SIGPIPE
 * Chg #1452: Do not save atime by default
 * Enh #11: Add the `diff` command
 * Enh #1436: Add code to detect old cache directories
 * Enh #1439: Improve cancellation logic

Details
-------

 * Bugfix #1454: Correct cache dir location for Windows and Darwin

   The cache directory on Windows and Darwin was not correct, instead the directory `.cache` was
   used.

   https://github.com/restic/restic/pull/1454

 * Bugfix #1457: Improve s3 backend with DigitalOcean Spaces

   https://github.com/restic/restic/issues/1457
   https://github.com/restic/restic/pull/1459

 * Bugfix #1459: Disable handling SIGPIPE

   We've disabled handling SIGPIPE again. Turns out, writing to broken TCP connections also
   raised SIGPIPE, so restic exits on the first write to a broken connection. Instead, restic
   should retry the request.

   https://github.com/restic/restic/issues/1457
   https://github.com/restic/restic/issues/1466
   https://github.com/restic/restic/pull/1459

 * Change #1452: Do not save atime by default

   By default, the access time for files and dirs is not saved any more. It is not possible to
   reliably disable updating the access time during a backup, so for the next backup the access
   time is different again. This means a lot of metadata is saved. If you want to save the access time
   anyway, pass `--with-atime` to the `backup` command.

   https://github.com/restic/restic/pull/1452

 * Enhancement #11: Add the `diff` command

   The command `diff` was added, it allows comparing two snapshots and listing all differences.

   https://github.com/restic/restic/issues/11
   https://github.com/restic/restic/issues/1460
   https://github.com/restic/restic/pull/1462

 * Enhancement #1436: Add code to detect old cache directories

   We've added code to detect old cache directories of repositories that haven't been used in a
   long time, restic now prints a note when it detects that such dirs exist. Also, the option
   `--cleanup-cache` was added to automatically remove such directories. That's not a problem
   because the cache will be rebuild once a repo is accessed again.

   https://github.com/restic/restic/pull/1436

 * Enhancement #1439: Improve cancellation logic

   The cancellation logic was improved, restic can now shut down cleanly when requested to do so
   (e.g. via ctrl+c).

   https://github.com/restic/restic/pull/1439


Changelog for restic 0.8.0 (2017-11-26)
=======================================

The following sections list the changes in restic 0.8.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Sec #1445: Prevent writing outside the target directory during restore
 * Fix #1256: Re-enable workaround for S3 backend
 * Fix #1291: Reuse backend TCP connections to BackBlaze B2
 * Fix #1317: Run prune when `forget --prune` is called with just snapshot IDs
 * Fix #1437: Remove implicit path `/restic` for the s3 backend
 * Enh #448: Sftp backend prompts for password
 * Enh #510: Add `dump` command
 * Enh #1040: Add local metadata cache
 * Enh #1102: Add subdirectory `ids` to fuse mount
 * Enh #1114: Add `--cacert` to specify TLS certificates to check against
 * Enh #1216: Add upload/download limiting
 * Enh #1249: Add `latest` symlink in fuse mount
 * Enh #1269: Add `--compact` to `forget` command
 * Enh #1271: Cache results for excludes for `backup`
 * Enh #1274: Add `generate` command, replaces `manpage` and `autocomplete`
 * Enh #1281: Google Cloud Storage backend needs less permissions
 * Enh #1319: Make `check` print `no errors found` explicitly
 * Enh #1353: Retry failed backend requests
 * Enh #1367: Allow comments in files read from via `--file-from`

Details
-------

 * Security #1445: Prevent writing outside the target directory during restore

   A vulnerability was found in the restic restorer, which allowed attackers in special
   circumstances to restore files to a location outside of the target directory. Due to the
   circumstances we estimate this to be a low-risk vulnerability, but urge all users to upgrade to
   the latest version of restic.

   Exploiting the vulnerability requires a Linux/Unix system which saves backups via restic and
   a Windows systems which restores files from the repo. In addition, the attackers need to be able
   to create files with arbitrary names which are then saved to the restic repo. For example, by
   creating a file named "..\test.txt" (which is a perfectly legal filename on Linux) and
   restoring a snapshot containing this file on Windows, it would be written to the parent of the
   target directory.

   We'd like to thank Tyler Spivey for reporting this responsibly!

   https://github.com/restic/restic/pull/1445

 * Bugfix #1256: Re-enable workaround for S3 backend

   We've re-enabled a workaround for `minio-go` (the library we're using to access s3 backends),
   this reduces memory usage.

   https://github.com/restic/restic/issues/1256
   https://github.com/restic/restic/pull/1267

 * Bugfix #1291: Reuse backend TCP connections to BackBlaze B2

   A bug was discovered in the library we're using to access Backblaze, it now reuses already
   established TCP connections which should be a lot faster and not cause network failures any
   more.

   https://github.com/restic/restic/issues/1291
   https://github.com/restic/restic/pull/1301

 * Bugfix #1317: Run prune when `forget --prune` is called with just snapshot IDs

   A bug in the `forget` command caused `prune` not to be run when `--prune` was specified without a
   policy, e.g. when only snapshot IDs that should be forgotten are listed manually.

   https://github.com/restic/restic/pull/1317

 * Bugfix #1437: Remove implicit path `/restic` for the s3 backend

   The s3 backend used the subdir `restic` within a bucket if no explicit path after the bucket name
   was specified. Since this version, restic does not use this default path any more. If you
   created a repo on s3 in a bucket without specifying a path within the bucket, you need to add
   `/restic` at the end of the repository specification to access your repo:
   `s3:s3.amazonaws.com/bucket/restic`

   https://github.com/restic/restic/issues/1292
   https://github.com/restic/restic/pull/1437

 * Enhancement #448: Sftp backend prompts for password

   The sftp backend now prompts for the password if a password is necessary for login.

   https://github.com/restic/restic/issues/448
   https://github.com/restic/restic/pull/1270

 * Enhancement #510: Add `dump` command

   We've added the `dump` command which prints a file from a snapshot to stdout. This can e.g. be
   used to restore files read with `backup --stdin`.

   https://github.com/restic/restic/issues/510
   https://github.com/restic/restic/pull/1346

 * Enhancement #1040: Add local metadata cache

   We've added a local cache for metadata so that restic doesn't need to load all metadata
   (snapshots, indexes, ...) from the repo each time it starts. By default the cache is active, but
   there's a new global option `--no-cache` that can be used to disable the cache. By deafult, the
   cache a standard cache folder for the OS, which can be overridden with `--cache-dir`. The cache
   will automatically populate, indexes and snapshots are saved as they are loaded. Cache
   directories for repos that haven't been used recently can automatically be removed by restic
   with the `--cleanup-cache` option.

   A related change was to by default create pack files in the repo that contain either data or
   metadata, not both mixed together. This allows easy caching of only the metadata files. The
   next run of `restic prune` will untangle mixed files automatically.

   https://github.com/restic/restic/issues/29
   https://github.com/restic/restic/issues/738
   https://github.com/restic/restic/issues/282
   https://github.com/restic/restic/pull/1040
   https://github.com/restic/restic/pull/1287
   https://github.com/restic/restic/pull/1436
   https://github.com/restic/restic/pull/1265

 * Enhancement #1102: Add subdirectory `ids` to fuse mount

   The fuse mount now has an `ids` subdirectory which contains the snapshots below their (short)
   IDs.

   https://github.com/restic/restic/issues/1102
   https://github.com/restic/restic/pull/1299
   https://github.com/restic/restic/pull/1320

 * Enhancement #1114: Add `--cacert` to specify TLS certificates to check against

   We've added the `--cacert` option which can be used to pass one (or more) CA certificates to
   restic. These are used in addition to the system CA certificates to verify HTTPS certificates
   (e.g. for the REST backend).

   https://github.com/restic/restic/issues/1114
   https://github.com/restic/restic/pull/1276

 * Enhancement #1216: Add upload/download limiting

   We've added support for rate limiting through `--limit-upload` and `--limit-download`
   flags.

   https://github.com/restic/restic/issues/1216
   https://github.com/restic/restic/pull/1336
   https://github.com/restic/restic/pull/1358

 * Enhancement #1249: Add `latest` symlink in fuse mount

   The directory structure in the fuse mount now exposes a symlink `latest` which points to the
   latest snapshot in that particular directory.

   https://github.com/restic/restic/pull/1249

 * Enhancement #1269: Add `--compact` to `forget` command

   The option `--compact` was added to the `forget` command to provide the same compact view as the
   `snapshots` command.

   https://github.com/restic/restic/pull/1269

 * Enhancement #1271: Cache results for excludes for `backup`

   The `backup` command now caches the result of excludes for a directory.

   https://github.com/restic/restic/issues/1271
   https://github.com/restic/restic/pull/1326

 * Enhancement #1274: Add `generate` command, replaces `manpage` and `autocomplete`

   The `generate` command has been added, which replaces the now removed commands `manpage` and
   `autocomplete`. This release of restic contains the most recent manpages in `doc/man` and the
   auto-completion files for bash and zsh in `doc/bash-completion.sh` and
   `doc/zsh-completion.zsh`

   https://github.com/restic/restic/issues/1274
   https://github.com/restic/restic/pull/1282

 * Enhancement #1281: Google Cloud Storage backend needs less permissions

   The Google Cloud Storage backend no longer requires the service account to have the
   `storage.buckets.get` permission ("Storage Admin" role) in `restic init` if the bucket
   already exists.

   https://github.com/restic/restic/pull/1281

 * Enhancement #1319: Make `check` print `no errors found` explicitly

   The `check` command now explicetly prints `No errors were found` when no errors could be found.

   https://github.com/restic/restic/issues/1303
   https://github.com/restic/restic/pull/1319

 * Enhancement #1353: Retry failed backend requests

   https://github.com/restic/restic/pull/1353

 * Enhancement #1367: Allow comments in files read from via `--file-from`

   When the list of files/dirs to be saved is read from a file with `--files-from`, comment lines
   (starting with `#`) are now ignored.

   https://github.com/restic/restic/issues/1367
   https://github.com/restic/restic/pull/1368


Changelog for restic 0.7.3 (2017-09-20)
=======================================

The following sections list the changes in restic 0.7.3 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1246: List all files stored in Google Cloud Storage

Details
-------

 * Bugfix #1246: List all files stored in Google Cloud Storage

   For large backups stored in Google Cloud Storage, the `prune` command fails because listing
   only returns the first 1000 files. This has been corrected, no data is lost in the process. In
   addition, a plausibility check was added to `prune`.

   https://github.com/restic/restic/issues/1246
   https://github.com/restic/restic/pull/1247


Changelog for restic 0.7.2 (2017-09-13)
=======================================

The following sections list the changes in restic 0.7.2 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1164: Make the `key remove` command behave as documented
 * Fix #1167: Do not create a local repo unless `init` is used
 * Fix #1191: Make sure to write profiling files on interrupt
 * Enh #317: Add `--exclude-caches` and `--exclude-if-present`
 * Enh #697: Automatically generate man pages for all restic commands
 * Enh #1044: Improve `restore`, do not traverse/load excluded directories
 * Enh #1061: Add Dockerfile and official Docker image
 * Enh #1126: Use the standard Go git repository layout, use `dep` for vendoring
 * Enh #1132: Make `key` command always prompt for a password
 * Enh #1134: Add support for storing backups on Google Cloud Storage
 * Enh #1144: Properly report errors when reading files with exclude patterns
 * Enh #1149: Add support for storing backups on Microsoft Azure Blob Storage
 * Enh #1179: Resolve name conflicts, append a counter
 * Enh #1196: Add `--group-by` to `forget` command for flexible grouping
 * Enh #1203: Print stats on all BSD systems when SIGINFO (ctrl+t) is received
 * Enh #1205: Allow specifying time/date for a backup with `--time`
 * Enh #1218: Add `--compact` to `snapshots` command

Details
-------

 * Bugfix #1164: Make the `key remove` command behave as documented

   https://github.com/restic/restic/pull/1164

 * Bugfix #1167: Do not create a local repo unless `init` is used

   When a restic command other than `init` is used with a local repository and the repository
   directory does not exist, restic creates the directory structure. That's an error, only the
   `init` command should create the dir.

   https://github.com/restic/restic/issues/1167
   https://github.com/restic/restic/pull/1182

 * Bugfix #1191: Make sure to write profiling files on interrupt

   Since a few releases restic had the ability to write profiling files for memory and CPU usage
   when `debug` is enabled. It was discovered that when restic is interrupted (ctrl+c is
   pressed), the proper shutdown hook is not run. This is now corrected.

   https://github.com/restic/restic/pull/1191

 * Enhancement #317: Add `--exclude-caches` and `--exclude-if-present`

   A new option `--exclude-caches` was added that allows excluding cache directories (that are
   tagged as such). This is a special case of a more generic option `--exclude-if-present` which
   excludes a directory if a file with a specific name (and contents) is present.

   https://github.com/restic/restic/issues/317
   https://github.com/restic/restic/pull/1170
   https://github.com/restic/restic/pull/1224

 * Enhancement #697: Automatically generate man pages for all restic commands

   https://github.com/restic/restic/issues/697
   https://github.com/restic/restic/pull/1147

 * Enhancement #1044: Improve `restore`, do not traverse/load excluded directories

   https://github.com/restic/restic/pull/1044

 * Enhancement #1061: Add Dockerfile and official Docker image

   https://github.com/restic/restic/pull/1061

 * Enhancement #1126: Use the standard Go git repository layout, use `dep` for vendoring

   The git repository layout was changed to resemble the layout typically used in Go projects,
   we're not using `gb` for building restic any more and vendoring the dependencies is now taken
   care of by `dep`.

   https://github.com/restic/restic/pull/1126

 * Enhancement #1132: Make `key` command always prompt for a password

   The `key` command now prompts for a password even if the original password to access a repo has
   been specified via the `RESTIC_PASSWORD` environment variable or a password file.

   https://github.com/restic/restic/issues/1132
   https://github.com/restic/restic/pull/1133

 * Enhancement #1134: Add support for storing backups on Google Cloud Storage

   https://github.com/restic/restic/issues/211
   https://github.com/restic/restic/pull/1134
   https://github.com/restic/restic/pull/1052

 * Enhancement #1144: Properly report errors when reading files with exclude patterns

   https://github.com/restic/restic/pull/1144

 * Enhancement #1149: Add support for storing backups on Microsoft Azure Blob Storage

   The library we're using to access the service requires Go 1.8, so restic now needs at least Go
   1.8.

   https://github.com/restic/restic/issues/609
   https://github.com/restic/restic/pull/1149
   https://github.com/restic/restic/pull/1059

 * Enhancement #1179: Resolve name conflicts, append a counter

   https://github.com/restic/restic/issues/1179
   https://github.com/restic/restic/pull/1209

 * Enhancement #1196: Add `--group-by` to `forget` command for flexible grouping

   https://github.com/restic/restic/pull/1196

 * Enhancement #1203: Print stats on all BSD systems when SIGINFO (ctrl+t) is received

   https://github.com/restic/restic/pull/1203
   https://github.com/restic/restic/pull/1082#issuecomment-326279920

 * Enhancement #1205: Allow specifying time/date for a backup with `--time`

   https://github.com/restic/restic/pull/1205

 * Enhancement #1218: Add `--compact` to `snapshots` command

   The option `--compact` was added to the `snapshots` command to get a better overview of the
   snapshots in a repo. It limits each snapshot to a single line.

   https://github.com/restic/restic/issues/1218
   https://github.com/restic/restic/pull/1223


Changelog for restic 0.7.1 (2017-07-22)
=======================================

The following sections list the changes in restic 0.7.1 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #1115: Fix `prune`, only include existing files in indexes
 * Enh #1055: Create subdirs below `data/` for local/sftp backends
 * Enh #1067: Allow loading credentials for s3 from IAM
 * Enh #1073: Add `migrate` cmd to migrate from `s3legacy` to `default` layout
 * Enh #1080: Ignore chmod() errors on filesystems which do not support it
 * Enh #1081: Clarify semantic for `--tag` for the `forget` command
 * Enh #1082: Print stats on SIGINFO on Darwin and FreeBSD (ctrl+t)

Details
-------

 * Bugfix #1115: Fix `prune`, only include existing files in indexes

   A bug was found (and corrected) in the index rebuilding after prune, which led to indexes which
   include blobs that were not present in the repo any more. There were already checks in place
   which detected this situation and aborted with an error message. A new run of either `prune` or
   `rebuild-index` corrected the index files. This is now fixed and a test has been added to detect
   this.

   https://github.com/restic/restic/pull/1115

 * Enhancement #1055: Create subdirs below `data/` for local/sftp backends

   The local and sftp backends now create the subdirs below `data/` on open/init. This way, restic
   makes sure that they always exist. This is connected to an issue for the sftp server.

   https://github.com/restic/restic/issues/1055
   https://github.com/restic/rest-server/pull/11#issuecomment-309879710
   https://github.com/restic/restic/pull/1077
   https://github.com/restic/restic/pull/1105

 * Enhancement #1067: Allow loading credentials for s3 from IAM

   When no S3 credentials are specified in the environment variables, restic now tries to load
   credentials from an IAM instance profile when the s3 backend is used.

   https://github.com/restic/restic/issues/1067
   https://github.com/restic/restic/pull/1086

 * Enhancement #1073: Add `migrate` cmd to migrate from `s3legacy` to `default` layout

   The `migrate` command for changing the `s3legacy` layout to the `default` layout for s3
   backends has been improved: It can now be restarted with `restic migrate --force s3_layout`
   and automatically retries operations on error.

   https://github.com/restic/restic/issues/1073
   https://github.com/restic/restic/pull/1075

 * Enhancement #1080: Ignore chmod() errors on filesystems which do not support it

   https://github.com/restic/restic/pull/1080
   https://github.com/restic/restic/pull/1112

 * Enhancement #1081: Clarify semantic for `--tag` for the `forget` command

   https://github.com/restic/restic/issues/1081
   https://github.com/restic/restic/pull/1090

 * Enhancement #1082: Print stats on SIGINFO on Darwin and FreeBSD (ctrl+t)

   https://github.com/restic/restic/pull/1082


Changelog for restic 0.7.0 (2017-07-01)
=======================================

The following sections list the changes in restic 0.7.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Fix #965: Switch to `default` repo layout for the s3 backend
 * Fix #1013: Switch back to using the high-level minio-go API for s3
 * Enh #512: Add Backblaze B2 backend
 * Enh #636: Add dirs `tags` and `hosts` to fuse mount
 * Enh #975: Add new backend for OpenStack Swift
 * Enh #989: Improve performance of the `find` command
 * Enh #998: Improve performance of the fuse mount
 * Enh #1021: Detect invalid backend name and print error
 * Enh #1029: Remove invalid pack files when `prune` is run

Details
-------

 * Bugfix #965: Switch to `default` repo layout for the s3 backend

   The default layout for the s3 backend is now `default` (instead of `s3legacy`). Also, there's a
   new `migrate` command to convert an existing repo, it can be run like this: `restic migrate
   s3_layout`

   https://github.com/restic/restic/issues/965
   https://github.com/restic/restic/pull/1004

 * Bugfix #1013: Switch back to using the high-level minio-go API for s3

   For the s3 backend we're back to using the high-level API the s3 client library for uploading
   data, a few users reported dropped connections (which the library will automatically retry
   now).

   https://github.com/restic/restic/issues/1013
   https://github.com/restic/restic/issues/1023
   https://github.com/restic/restic/pull/1025

 * Enhancement #512: Add Backblaze B2 backend

   https://github.com/restic/restic/issues/512
   https://github.com/restic/restic/pull/978

 * Enhancement #636: Add dirs `tags` and `hosts` to fuse mount

   The fuse mount now has two more directories: `tags` contains a subdir for each tag, which in turn
   contains only the snapshots that have this tag. The subdir `hosts` contains a subdir for each
   host that has a snapshot, and the subdir contains the snapshots for that host.

   https://github.com/restic/restic/issues/636
   https://github.com/restic/restic/pull/1050

 * Enhancement #975: Add new backend for OpenStack Swift

   https://github.com/restic/restic/pull/975
   https://github.com/restic/restic/pull/648

 * Enhancement #989: Improve performance of the `find` command

   Improved performance for the `find` command: Restic recognizes paths it has already checked
   for the files in question, so the number of backend requests is reduced a lot.

   https://github.com/restic/restic/issues/989
   https://github.com/restic/restic/pull/993

 * Enhancement #998: Improve performance of the fuse mount

   Listing directories which contain large files now is significantly faster.

   https://github.com/restic/restic/pull/998

 * Enhancement #1021: Detect invalid backend name and print error

   Restic now tries to detect when an invalid/unknown backend is used and returns an error
   message.

   https://github.com/restic/restic/issues/1021
   https://github.com/restic/restic/pull/1070

 * Enhancement #1029: Remove invalid pack files when `prune` is run

   The `prune` command has been improved and will now remove invalid pack files, for example files
   that have not been uploaded completely because a backup was interrupted.

   https://github.com/restic/restic/issues/1029
   https://github.com/restic/restic/pull/1036


Changelog for restic 0.6.1 (2017-06-01)
=======================================

The following sections list the changes in restic 0.6.1 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Enh #974: Remove regular status reports
 * Enh #981: Remove temporary path from binary in `build.go`
 * Enh #985: Allow multiple parallel idle HTTP connections

Details
-------

 * Enhancement #974: Remove regular status reports

   Regular status report: We've removed the status report that was printed every 10 seconds when
   restic is run non-interactively. You can still force reporting the current status by sending a
   `USR1` signal to the process.

   https://github.com/restic/restic/pull/974

 * Enhancement #981: Remove temporary path from binary in `build.go`

   The `build.go` now strips the temporary directory used for compilation from the binary. This
   is the first step in enabling reproducible builds.

   https://github.com/restic/restic/pull/981

 * Enhancement #985: Allow multiple parallel idle HTTP connections

   Backends based on HTTP now allow several idle connections in parallel. This is especially
   important for the REST backend, which (when used with a local server) may create a lot
   connections and exhaust available ports quickly.

   https://github.com/restic/restic/issues/985
   https://github.com/restic/restic/pull/986


Changelog for restic 0.6.0 (2017-05-29)
=======================================

The following sections list the changes in restic 0.6.0 relevant to
restic users. The changes are ordered by importance.

Summary
-------

 * Enh #957: Make `forget` consistent
 * Enh #962: Improve memory and runtime for the s3 backend
 * Enh #966: Unify repository layout for all backends

Details
-------

 * Enhancement #957: Make `forget` consistent

   The `forget` command was corrected to be more consistent in which snapshots are to be
   forgotten. It is possible that the new code removes more snapshots than before, so please
   review what would be deleted by using the `--dry-run` option.

   https://github.com/restic/restic/issues/953
   https://github.com/restic/restic/pull/957

 * Enhancement #962: Improve memory and runtime for the s3 backend

   We've updated the library used for accessing s3, switched to using a lower level API and added
   caching for some requests. This lead to a decrease in memory usage and a great speedup. In
   addition, we added benchmark functions for all backends, so we can track improvements over
   time. The Continuous Integration test service we're using (Travis) now runs the s3 backend
   tests not only against a Minio server, but also against the Amazon s3 live service, so we should
   be notified of any regressions much sooner.

   https://github.com/restic/restic/pull/962
   https://github.com/restic/restic/pull/960
   https://github.com/restic/restic/pull/946
   https://github.com/restic/restic/pull/938
   https://github.com/restic/restic/pull/883

 * Enhancement #966: Unify repository layout for all backends

   Up to now the s3 backend used a special repository layout. We've decided to unify the repository
   layout and implemented the default layout also for the s3 backend. For creating a new
   repository on s3 with the default layout, use `restic -o s3.layout=default init`. For further
   commands the option is not necessary any more, restic will automatically detect the correct
   layout to use. A future version will switch to the default layout for new repositories.

   https://github.com/restic/restic/issues/965
   https://github.com/restic/restic/pull/966