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Merge pull request #2530 from restic/fix-sftp-mkdirall

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sftp: Use MkdirAll provided by the client
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rawtaz 2020-02-13 01:12:59 +01:00 committed by GitHub
commit 680a14afa1
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3 changed files with 23 additions and 37 deletions
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16
changelog/unreleased/issue-2518 Normal file
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@ -0,0 +1,16 @@
Bugfix: 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

7
doc/faq.rst
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@ -142,6 +142,9 @@ is not slowed down, which is particularly useful for servers.
Creating new repo on a Synology NAS via sftp fails
--------------------------------------------------
For using restic with a Synology NAS via sftp, please make sure that the
specified path is absolute, it must start with a slash (``/``).
Sometimes creating a new restic repository on a Synology NAS via sftp fails
with an error similar to the following:
@ -160,8 +163,8 @@ different than the directory structure on the device and maybe even as exposed
via other protocols.
Try removing the /volume1 prefix in your paths. If this does not work, use sftp
and ls to explore the SFTP file system hierarchy on your NAS.
Try removing the ``/volume1`` prefix in your paths. If this does not work, use
sftp and ls to explore the SFTP file system hierarchy on your NAS.
The following may work:

37
internal/backend/sftp/sftp.go
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@ -138,8 +138,7 @@ func Open(cfg Config) (*SFTP, error) {
func (r *SFTP) mkdirAllDataSubdirs() error {
for _, d := range r.Paths() {
err := r.mkdirAll(d, backend.Modes.Dir)
debug.Log("mkdirAll %v -> %v", d, err)
err := r.c.MkdirAll(d)
if err != nil {
return err
}
@ -250,38 +249,6 @@ func (r *SFTP) Location() string {
return r.p
}
func (r *SFTP) mkdirAll(dir string, mode os.FileMode) error {
// check if directory already exists
fi, err := r.c.Lstat(dir)
if err == nil {
if fi.IsDir() {
return nil
}
return errors.Errorf("mkdirAll(%s): entry exists but is not a directory", dir)
}
// create parent directories
errMkdirAll := r.mkdirAll(path.Dir(dir), backend.Modes.Dir)
// create directory
errMkdir := r.c.Mkdir(dir)
// test if directory was created successfully
fi, err = r.c.Lstat(dir)
if err != nil {
// return previous errors
return errors.Errorf("mkdirAll(%s): unable to create directories: %v, %v", dir, errMkdirAll, errMkdir)
}
if !fi.IsDir() {
return errors.Errorf("mkdirAll(%s): entry exists but is not a directory", dir)
}
// set mode
return r.c.Chmod(dir, mode)
}
// Join joins the given paths and cleans them afterwards. This always uses
// forward slashes, which is required by sftp.
func Join(parts ...string) string {
@ -306,7 +273,7 @@ func (r *SFTP) Save(ctx context.Context, h restic.Handle, rd restic.RewindReader
if r.IsNotExist(err) {
// error is caused by a missing directory, try to create it
mkdirErr := r.mkdirAll(r.Dirname(h), backend.Modes.Dir)
mkdirErr := r.c.MkdirAll(r.Dirname(h))
if mkdirErr != nil {
debug.Log("error creating dir %v: %v", r.Dirname(h), mkdirErr)
} else {