config: do not remove/overwrite other files during config file save - fixes #3759
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2 changed files with 27 additions and 16 deletions
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@ -952,15 +952,9 @@ To reduce risk of corrupting an existing configuration file, rclone
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will not write directly to it when saving changes. Instead it will
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first write to a new, temporary, file. If a configuration file already
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existed, it will (on Unix systems) try to mirror its permissions to
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the new file. Then it will rename the existing file by adding suffix
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".old" to its name (e.g. `rclone.conf.old`), if a file with the same
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name already exists it will simply be replaced. Next, rclone will rename
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the new file to the correct name, before finally cleaning up by deleting
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the original file now which has now ".old" suffix to its name. Note that
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one side-effect of this is that if you happen to have a file in the same
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directory and with the same name as your configuration file, but with
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suffix ".old", then rclone will end up deleting this file next time it
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updates its configuration file!
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the new file. Then it will rename the existing file to a temporary
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name as backup. Next, rclone will rename the new file to the correct name,
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before finally cleaning up by deleting the backup file.
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### --contimeout=TIME ###
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@ -106,7 +106,6 @@ func (s *Storage) Save() error {
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if configPath == "" {
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return fmt.Errorf("failed to save config file, path is empty")
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}
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dir, name := filepath.Split(configPath)
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err := file.MkdirAll(dir, os.ModePerm)
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if err != nil {
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@ -119,7 +118,7 @@ func (s *Storage) Save() error {
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defer func() {
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_ = f.Close()
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if err := os.Remove(f.Name()); err != nil && !os.IsNotExist(err) {
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fs.Errorf(nil, "failed to remove temp config file: %v", err)
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fs.Errorf(nil, "Failed to remove temp file for new config: %v", err)
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}
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}()
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@ -154,15 +153,33 @@ func (s *Storage) Save() error {
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fs.Errorf(nil, "Failed to set permissions on config file: %v", err)
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}
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if err = os.Rename(configPath, configPath+".old"); err != nil && !os.IsNotExist(err) {
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fbackup, err := os.CreateTemp(dir, name+".old")
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if err != nil {
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return fmt.Errorf("failed to create temp file for old config backup: %w", err)
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}
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err = fbackup.Close()
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if err != nil {
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return fmt.Errorf("failed to close temp file for old config backup: %w", err)
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}
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keepBackup := true
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defer func() {
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if !keepBackup {
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if err := os.Remove(fbackup.Name()); err != nil && !os.IsNotExist(err) {
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fs.Errorf(nil, "Failed to remove temp file for old config backup: %v", err)
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}
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}
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}()
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if err = os.Rename(configPath, fbackup.Name()); err != nil {
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if !os.IsNotExist(err) {
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return fmt.Errorf("failed to move previous config to backup location: %w", err)
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}
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keepBackup = false // no existing file, no need to keep backup even if writing of new file fails
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}
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if err = os.Rename(f.Name(), configPath); err != nil {
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return fmt.Errorf("failed to move newly written config from %s to final location: %v", f.Name(), err)
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}
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if err := os.Remove(configPath + ".old"); err != nil && !os.IsNotExist(err) {
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fs.Errorf(nil, "Failed to remove backup config file: %v", err)
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}
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keepBackup = false // new file was written, no need to keep backup
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// Update s.fi with the newly written file
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s.fi, _ = os.Stat(configPath)
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