// XXX: would really like not to expose this but used in daemon tests atm
func UpdateCurrentSymlink(info *snap.Info, inter interacter) error {
mountDir := info.MountDir()
currentActiveSymlink := filepath.Join(mountDir, "..", "current")
if err := os.Remove(currentActiveSymlink); err != nil && !os.IsNotExist(err) {
logger.Noticef("Failed to remove %q: %v", currentActiveSymlink, err)
}
dataDir := info.DataDir()
dbase := filepath.Dir(dataDir)
currentDataSymlink := filepath.Join(dbase, "current")
if err := os.Remove(currentDataSymlink); err != nil && !os.IsNotExist(err) {
logger.Noticef("Failed to remove %q: %v", currentDataSymlink, err)
}
// symlink is relative to parent dir
if err := os.Symlink(filepath.Base(mountDir), currentActiveSymlink); err != nil {
return err
}
if err := os.MkdirAll(info.DataDir(), 0755); err != nil {
return err
}
// FIXME: create {Os,Kernel}Snap type instead of adding special
// cases here
if err := setNextBoot(info); err != nil {
return err
}
return os.Symlink(filepath.Base(dataDir), currentDataSymlink)
}
func CopyData(newSnap, oldSnap *snap.Info, flags InstallFlags, meter progress.Meter) error {
dataDir := newSnap.DataDir()
// deal with the old data or
// otherwise just create a empty data dir
if oldSnap == nil {
return os.MkdirAll(dataDir, 0755)
}
return copySnapData(oldSnap, newSnap)
}
// Copy all data for oldSnap to newSnap
// (but never overwrite)
func copySnapData(oldSnap, newSnap *snap.Info) (err error) {
oldDataDirs, err := snapDataDirs(oldSnap)
if err != nil {
return err
}
newSuffix := filepath.Base(newSnap.DataDir())
for _, oldDir := range oldDataDirs {
// replace the trailing "../$old-suffix" with the "../$new-suffix"
newDir := filepath.Join(filepath.Dir(oldDir), newSuffix)
if err := copySnapDataDirectory(oldDir, newDir); err != nil {
return err
}
}
return nil
}
// snapDataDirs returns the list of data directories for the given snap version
func snapDataDirs(snap *snap.Info) ([]string, error) {
// collect the directories, homes first
found, err := filepath.Glob(snap.DataHomeDir())
if err != nil {
return nil, err
}
// then system data
found = append(found, snap.DataDir())
return found, nil
}