// backup the app data.
// This method won't lock the taskMutex. You have to handle it!
func (a *App) backup() error {
// Don't backup during some special app tasks.
if a.task == taskCloneSource ||
a.task == taskUpdate {
return fmt.Errorf("can't backup app '%s' during an update task!", a.name)
}
// Get the app's base backup folder.
backupPath := a.BackupDirectoryPath()
// Create the base app backup folder if not present.
err := utils.MkDirIfNotExists(backupPath)
if err != nil {
return fmt.Errorf("failed to backup app '%s': %v", a.name, err)
}
// Create a new backup directory with the current timestamp.
backupPath += "/" + strconv.FormatInt(time.Now().Unix(), 10)
// Log
log.Infof("creating backup of app '%s': %s", a.name, backupPath)
// Create a snapshot of the complete app subvolume.
err = btrfs.Snapshot(a.path, backupPath, true)
if err != nil {
return fmt.Errorf("failed to backup app '%s': %v", a.name, err)
}
return nil
}
// RestoreBackup restores the given app backup.
func (a *App) RestoreBackup(timestamp string) (err error) {
// Lock the task mutex.
// The app should not be started during a backup process.
a.taskMutex.Lock()
defer a.taskMutex.Unlock()
// Abort if any app ask is running.
if a.IsTaskRunning() {
return fmt.Errorf("the app is running!")
}
// Create the backup directory path.
backupPath := a.BackupDirectoryPath() + "/" + timestamp
// Check if the backup exists.
if !btrfs.IsSubvolume(backupPath) {
return fmt.Errorf("no backup '%s' found!", timestamp)
}
// Create the apps backup path for the current data.
newAppBackupPath := a.BackupDirectoryPath() + "/" + strconv.FormatInt(time.Now().Unix(), 10)
// Log
log.Infof("restoring backup of app '%s': %s", a.name, timestamp)
// Reload the turtlefile and settings on defer.
defer func() {
err = a.reload()
}()
// Move the current subvolume to the backup location with the current timestamp.
err = os.Rename(a.path, newAppBackupPath)
if err != nil {
return fmt.Errorf("failed to move apps current subvolume: %v", err)
}
// Restore the current backup subvolume on failure.
defer func() {
if err != nil {
errR := os.Rename(newAppBackupPath, a.path)
if errR != nil {
log.Errorf("failed to restore apps current subvolume backup: %v", errR)
} else {
// Remove the readonly flag again.
errR = btrfs.SetSubvolumeReadonly(a.path, false)
if errR != nil {
log.Errorf("failed to restore apps subvolume flag: %v", errR)
}
}
}
}()
// Set the readonly flag on the moved subvolume.
err = btrfs.SetSubvolumeReadonly(newAppBackupPath, true)
if err != nil {
return err
}
// Create a snapshot of the backup and restore it to the app path.
err = btrfs.Snapshot(backupPath, a.path, false)
if err != nil {
return fmt.Errorf("failed to restore app '%s': %v", a.name, err)
}
return nil
}