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backend/local: Ignore ENOTTY for fsync on Mac

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Fixes #4016.
This commit is contained in:
greatroar 2022-11-11 14:53:42 +01:00 committed by Michael Eischer
parent 59a90943bb
commit 348e966daa
4 changed files with 25 additions and 2 deletions
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8
changelog/unreleased/issue-4016 Normal file
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@ -0,0 +1,8 @@
Bugfix: 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 "inappropriate ioctl for device". This
has been fixed.
https://github.com/restic/restic/issues/4016
https://github.com/restic/restic/pull/4021

2
internal/backend/local/local.go
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@ -177,7 +177,7 @@ func (b *Local) Save(ctx context.Context, h restic.Handle, rd restic.RewindReade
// Ignore error if filesystem does not support fsync.
err = f.Sync()
syncNotSup := errors.Is(err, syscall.ENOTSUP)
syncNotSup := err != nil && (errors.Is(err, syscall.ENOTSUP) || isMacENOTTY(err))
if err != nil && !syncNotSup {
return errors.WithStack(err)
}

14
internal/backend/local/local_unix.go
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@ -6,6 +6,7 @@ package local
import (
"errors"
"os"
"runtime"
"syscall"
"github.com/restic/restic/internal/fs"
@ -19,7 +20,9 @@ func fsyncDir(dir string) error {
}
err = d.Sync()
if errors.Is(err, syscall.ENOTSUP) || errors.Is(err, syscall.ENOENT) || errors.Is(err, syscall.EINVAL) {
if err != nil &&
(errors.Is(err, syscall.ENOTSUP) || errors.Is(err, syscall.ENOENT) ||
errors.Is(err, syscall.EINVAL) || isMacENOTTY(err)) {
err = nil
}
@ -31,6 +34,15 @@ func fsyncDir(dir string) error {
return err
}
// The ExFAT driver on some versions of macOS can return ENOTTY,
// "inappropriate ioctl for device", for fsync.
//
// https://github.com/restic/restic/issues/4016
// https://github.com/realm/realm-core/issues/5789
func isMacENOTTY(err error) bool {
return runtime.GOOS == "darwin" && errors.Is(err, syscall.ENOTTY)
}
// set file to readonly
func setFileReadonly(f string, mode os.FileMode) error {
return fs.Chmod(f, mode&^0222)

3
internal/backend/local/local_windows.go
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@ -7,6 +7,9 @@ import (
// Can't explicitly flush directory changes on Windows.
func fsyncDir(dir string) error { return nil }
// Windows is not macOS.
func isMacENOTTY(err error) bool { return false }
// 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.