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dump: add --target option

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This commit is contained in:
Srigovind Nayak 2024-02-04 14:15:14 +05:30 committed by Michael Eischer
parent 0f09a8870c
commit 175c14b5c9
3 changed files with 37 additions and 6 deletions
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7
changelog/unreleased/issue-4678 Normal file
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@ -0,0 +1,7 @@
Enhancement: Add --target flag to the dump command
Restic `dump` always printed to the standard output. It now permits to select a
`--target` file to print the output.
https://github.com/restic/restic/issues/4678
https://github.com/restic/restic/pull/4682

29
cmd/restic/cmd_dump.go
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@ -46,6 +46,7 @@ Exit status is 0 if the command was successful, and non-zero if there was any er
type DumpOptions struct {
restic.SnapshotFilter
Archive string
Target string
}
var dumpOptions DumpOptions
@ -56,6 +57,7 @@ func init() {
flags := cmdDump.Flags()
initSingleSnapshotFilter(flags, &dumpOptions.SnapshotFilter)
flags.StringVarP(&dumpOptions.Archive, "archive", "a", "tar", "set archive `format` as \"tar\" or \"zip\"")
flags.StringVarP(&dumpOptions.Target, "target", "t", "", "set the target path to dump the archive file")
}
func splitPath(p string) []string {
@ -67,11 +69,11 @@ func splitPath(p string) []string {
return append(s, f)
}
func printFromTree(ctx context.Context, tree *restic.Tree, repo restic.BlobLoader, prefix string, pathComponents []string, d *dump.Dumper) error {
func printFromTree(ctx context.Context, tree *restic.Tree, repo restic.BlobLoader, prefix string, pathComponents []string, d *dump.Dumper, checkStdoutArchiveFunc func() error) error {
// If we print / we need to assume that there are multiple nodes at that
// level in the tree.
if pathComponents[0] == "" {
if err := checkStdoutArchive(); err != nil {
if err := checkStdoutArchiveFunc(); err != nil {
return err
}
return d.DumpTree(ctx, tree, "/")
@ -91,9 +93,9 @@ func printFromTree(ctx context.Context, tree *restic.Tree, repo restic.BlobLoade
if err != nil {
return errors.Wrapf(err, "cannot load subtree for %q", item)
}
return printFromTree(ctx, subtree, repo, item, pathComponents[1:], d)
return printFromTree(ctx, subtree, repo, item, pathComponents[1:], d, checkStdoutArchiveFunc)
case dump.IsDir(node):
if err := checkStdoutArchive(); err != nil {
if err := checkStdoutArchiveFunc(); err != nil {
return err
}
subtree, err := restic.LoadTree(ctx, repo, *node.Subtree)
@ -168,8 +170,23 @@ func runDump(ctx context.Context, opts DumpOptions, gopts GlobalOptions, args []
return errors.Fatalf("loading tree for snapshot %q failed: %v", snapshotIDString, err)
}
d := dump.New(opts.Archive, repo, os.Stdout)
err = printFromTree(ctx, tree, repo, "/", splittedPath, d)
var outputFileWriter = os.Stdout
checkStdoutArchiveFunc := checkStdoutArchive
if opts.Target != "" {
file, err := os.OpenFile(opts.Target, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o666)
if err != nil {
return fmt.Errorf("cannot dump to file: %w", err)
}
defer func() {
_ = file.Close()
}()
outputFileWriter = file
checkStdoutArchiveFunc = func() error { return nil }
}
d := dump.New(opts.Archive, repo, outputFileWriter)
err = printFromTree(ctx, tree, repo, "/", splittedPath, d, checkStdoutArchiveFunc)
if err != nil {
return errors.Fatalf("cannot dump file: %v", err)
}

7
doc/050_restore.rst
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@ -174,3 +174,10 @@ To include the folder content at the root of the archive, you can use the ``<sna
.. code-block:: console
$ restic -r /srv/restic-repo dump latest:/home/other/work / > restore.tar
It is also possible to ``dump`` the contents of a selected snapshot and folder
structure to a file using the ``--target`` flag. The ``dump`` will fail if the
file exists.
.. code-block:: console
$ restic -r /srv/restic-repo dump latest / --target /home/linux.user/output.tar -a tar