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Merge pull request #3931 from kjetilho/feature/optional_scanner

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add --no-scan to backup command
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Michael Eischer 2022-12-16 21:42:22 +01:00 committed by GitHub
commit 2723159ed4
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3 changed files with 30 additions and 9 deletions
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8
changelog/unreleased/pull-3931 Normal file
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@ -0,0 +1,8 @@
Enhancement: Allow backup file tree scanner to be disabled
Restic walks the file tree in a separate scanner process to find the total size
and file/directory count, and uses that to provide an ETA. This can slow down
backups, especially of network filesystems. The new flag `--no-scan`
can be used to speed up such backups.
https://github.com/restic/restic/pull/3931

20
cmd/restic/cmd_backup.go
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@ -99,6 +99,7 @@ type BackupOptions struct {
UseFsSnapshot bool
DryRun bool
ReadConcurrency uint
NoScan bool
}
var backupOptions BackupOptions
@ -138,6 +139,7 @@ func init() {
f.BoolVar(&backupOptions.IgnoreInode, "ignore-inode", false, "ignore inode number changes when checking for modified files")
f.BoolVar(&backupOptions.IgnoreCtime, "ignore-ctime", false, "ignore ctime changes when checking for modified files")
f.BoolVarP(&backupOptions.DryRun, "dry-run", "n", false, "do not upload or write any data, just show what would be done")
f.BoolVar(&backupOptions.NoScan, "no-scan", false, "do not run scanner to estimate size of backup")
if runtime.GOOS == "windows" {
f.BoolVar(&backupOptions.UseFsSnapshot, "use-fs-snapshot", false, "use filesystem snapshot where possible (currently only Windows VSS)")
}
@ -586,16 +588,18 @@ func runBackup(ctx context.Context, opts BackupOptions, gopts GlobalOptions, ter
targets = []string{filename}
}
sc := archiver.NewScanner(targetFS)
sc.SelectByName = selectByNameFilter
sc.Select = selectFilter
sc.Error = progressPrinter.ScannerError
sc.Result = progressReporter.ReportTotal
if !opts.NoScan {
sc := archiver.NewScanner(targetFS)
sc.SelectByName = selectByNameFilter
sc.Select = selectFilter
sc.Error = progressPrinter.ScannerError
sc.Result = progressReporter.ReportTotal
if !gopts.JSON {
progressPrinter.V("start scan on %v", targets)
if !gopts.JSON {
progressPrinter.V("start scan on %v", targets)
}
wg.Go(func() error { return sc.Scan(cancelCtx, targets) })
}
wg.Go(func() error { return sc.Scan(cancelCtx, targets) })
arch := archiver.New(repo, targetFS, archiver.Options{ReadConcurrency: backupOptions.ReadConcurrency})
arch.SelectByName = selectByNameFilter

11
doc/040_backup.rst
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@ -204,8 +204,17 @@ Combined with ``--verbose``, you can see a list of changes:
modified /archive.tar.gz, saved in 0.140s (25.542 MiB added)
Would be added to the repository: 25.551 MiB
.. _backup-excluding-files:
Disabling Backup Progress Estimation
************************************
When you start a backup, restic will concurrently count the number of
files and their total size, which is used to estimate how long it will
take. This will cause some extra I/O, which can slow down backup of
network file systems or fuse mounts.
- ``--no-scan`` Do not run scanner to estimate size of backup
.. _backup-excluding-files:
Excluding Files
***************