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Merge pull request #2989 from MichaelEischer/remove-local-chmod

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local: mark repository files as read-only and handle chmod errors
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MichaelEischer 2020-10-08 19:04:13 +02:00 committed by GitHub
commit 4a424af1d5
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4 changed files with 28 additions and 5 deletions
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15
changelog/unreleased/issue-1756 Normal file
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@ -0,0 +1,15 @@
Bugfix: 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

12
internal/backend/local/local.go
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@ -130,7 +130,15 @@ func (b *Local) Save(ctx context.Context, h restic.Handle, rd restic.RewindReade
return errors.Wrap(err, "Close")
}
return setNewFileMode(filename, backend.Modes.File)
// try to mark file as read-only to avoid accidential modifications
// ignore if the operation fails as some filesystems don't allow the chmod call
// e.g. exfat and network file systems with certain mount options
err = setFileReadonly(filename, backend.Modes.File)
if err != nil && !os.IsPermission(err) {
return errors.Wrap(err, "Chmod")
}
return nil
}
// Load runs fn with a reader that yields the contents of the file at h at the
@ -205,7 +213,7 @@ func (b *Local) Remove(ctx context.Context, h restic.Handle) error {
// reset read-only flag
err := fs.Chmod(fn, 0666)
if err != nil {
if err != nil && !os.IsPermission(err) {
return errors.Wrap(err, "Chmod")
}

4
internal/backend/local/local_unix.go
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@ -9,6 +9,6 @@ import (
)
// set file to readonly
func setNewFileMode(f string, mode os.FileMode) error {
return fs.Chmod(f, mode)
func setFileReadonly(f string, mode os.FileMode) error {
return fs.Chmod(f, mode&^0222)
}

2
internal/backend/local/local_windows.go
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@ -7,6 +7,6 @@ import (
// We don't modify read-only on windows,
// since it will make us unable to delete the file,
// and this isn't common practice on this platform.
func setNewFileMode(f string, mode os.FileMode) error {
func setFileReadonly(f string, mode os.FileMode) error {
return nil
}