// UnlinkSnap deactivates the given active snap.
func UnlinkSnap(info *snap.Info, inter interacter) error {
mountDir := info.MountDir()
currentSymlink := filepath.Join(mountDir, "..", "current")
currentActiveDir, err := filepath.EvalSymlinks(currentSymlink)
if err != nil {
if os.IsNotExist(err) {
return ErrSnapNotActive
}
return err
}
if mountDir != currentActiveDir {
return ErrSnapNotActive
}
// remove generated services, binaries, security policy
err1 := RemoveGeneratedWrappers(info, inter)
// removing security setup move here!
// and finally remove current symlink
err2 := removeCurrentSymlink(info, inter)
// FIXME: aggregate errors instead
return firstErr(err1, err2)
}
func addPackageBinaries(s *snap.Info) error {
if err := os.MkdirAll(dirs.SnapBinariesDir, 0755); err != nil {
return err
}
baseDir := s.MountDir()
for _, app := range s.Apps {
if app.Daemon != "" {
continue
}
// this will remove the global base dir when generating the
// service file, this ensures that /snap/foo/1.0/bin/start
// is in the service file when the SetRoot() option
// is used
realBaseDir := stripGlobalRootDir(baseDir)
content, err := generateSnapBinaryWrapper(app, realBaseDir)
if err != nil {
return err
}
if err := osutil.AtomicWriteFile(app.WrapperPath(), []byte(content), 0755, 0); err != nil {
return err
}
}
return nil
}
// 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 addPackageDesktopFiles(s *snap.Info) error {
if err := os.MkdirAll(dirs.SnapDesktopFilesDir, 0755); err != nil {
return err
}
baseDir := s.MountDir()
desktopFiles, err := filepath.Glob(filepath.Join(baseDir, "meta", "gui", "*.desktop"))
if err != nil {
return fmt.Errorf("cannot get desktop files for %v: %s", baseDir, err)
}
for _, df := range desktopFiles {
content, err := ioutil.ReadFile(df)
if err != nil {
return err
}
realBaseDir := stripGlobalRootDir(baseDir)
content = sanitizeDesktopFile(s, realBaseDir, content)
installedDesktopFileName := filepath.Join(dirs.SnapDesktopFilesDir, fmt.Sprintf("%s_%s", s.Name(), filepath.Base(df)))
if err := osutil.AtomicWriteFile(installedDesktopFileName, []byte(content), 0755, 0); err != nil {
return err
}
}
return nil
}
func (f *fakeSnappyBackend) RemoveSnapData(info *snap.Info) error {
f.ops = append(f.ops, fakeOp{
op: "remove-snap-data",
name: info.MountDir(),
})
return nil
}
func (f *fakeSnappyBackend) UndoCopySnapData(newInfo *snap.Info, flags int) error {
f.ops = append(f.ops, fakeOp{
op: "undo-copy-snap-data",
name: newInfo.MountDir(),
})
return nil
}
// snapDate returns the time of the snap mount directory.
func snapDate(info *snap.Info) time.Time {
st, err := os.Stat(info.MountDir())
if err != nil {
return time.Time{}
}
return st.ModTime()
}
func (f *fakeSnappyBackend) UnlinkSnap(info *snap.Info, meter progress.Meter) error {
meter.Notify("unlink")
f.ops = append(f.ops, fakeOp{
op: "unlink-snap",
name: info.MountDir(),
})
return nil
}
func (f *fakeSnappyBackend) CanRemove(info *snap.Info, active bool) bool {
f.ops = append(f.ops, fakeOp{
op: "can-remove",
name: info.MountDir(),
active: active,
})
return true
}
// snapIcon tries to find the icon inside the snap
func snapIcon(info *snap.Info) string {
// XXX: copy of snap.Snap.Icon which will go away
found, _ := filepath.Glob(filepath.Join(info.MountDir(), "meta", "gui", "icon.*"))
if len(found) == 0 {
return ""
}
return found[0]
}
func (f *fakeSnappyBackend) CheckSnap(snapFilePath string, curInfo *snap.Info, flags int) error {
cur := "<no-current>"
if curInfo != nil {
cur = curInfo.MountDir()
}
f.ops = append(f.ops, fakeOp{
op: "check-snap",
name: snapFilePath,
old: cur,
flags: flags,
})
return nil
}
func (f *fakeSnappyBackend) CopySnapData(newInfo, oldInfo *snap.Info, flags int) error {
old := "<no-old>"
if oldInfo != nil {
old = oldInfo.MountDir()
}
f.ops = append(f.ops, fakeOp{
op: "copy-data",
name: newInfo.MountDir(),
flags: flags,
old: old,
})
return nil
}
func addSquashfsMount(s *snap.Info, inhibitHooks bool, inter interacter) error {
squashfsPath := stripGlobalRootDir(s.MountFile())
whereDir := stripGlobalRootDir(s.MountDir())
sysd := systemd.New(dirs.GlobalRootDir, inter)
mountUnitName, err := sysd.WriteMountUnitFile(s.Name(), squashfsPath, whereDir)
if err != nil {
return err
}
// we always enable the mount unit even in inhibit hooks
if err := sysd.Enable(mountUnitName); err != nil {
return err
}
if !inhibitHooks {
return sysd.Start(mountUnitName)
}
return nil
}
func (f *fakeSnappyBackend) LinkSnap(info *snap.Info) error {
if info.MountDir() == f.linkSnapFailTrigger {
f.ops = append(f.ops, fakeOp{
op: "link-snap.failed",
name: info.MountDir(),
})
return errors.New("fail")
}
f.ops = append(f.ops, fakeOp{
op: "link-snap",
name: info.MountDir(),
})
return nil
}
func addPackageServices(s *snap.Info, inter interacter) error {
baseDir := s.MountDir()
for _, app := range s.Apps {
if app.Daemon == "" {
continue
}
// this will remove the global base dir when generating the
// service file, this ensures that /snap/foo/1.0/bin/start
// is in the service file when the SetRoot() option
// is used
realBaseDir := stripGlobalRootDir(baseDir)
// Generate service file
content, err := generateSnapServicesFile(app, realBaseDir)
if err != nil {
return err
}
svcFilePath := app.ServiceFile()
os.MkdirAll(filepath.Dir(svcFilePath), 0755)
if err := osutil.AtomicWriteFile(svcFilePath, []byte(content), 0644, 0); err != nil {
return err
}
// Generate systemd socket file if needed
if app.Socket {
content, err := generateSnapSocketFile(app, realBaseDir)
if err != nil {
return err
}
svcSocketFilePath := app.ServiceSocketFile()
os.MkdirAll(filepath.Dir(svcSocketFilePath), 0755)
if err := osutil.AtomicWriteFile(svcSocketFilePath, []byte(content), 0644, 0); err != nil {
return err
}
}
// daemon-reload and enable plus start
serviceName := filepath.Base(app.ServiceFile())
sysd := systemd.New(dirs.GlobalRootDir, inter)
if err := sysd.DaemonReload(); err != nil {
return err
}
// enable the service
if err := sysd.Enable(serviceName); err != nil {
return err
}
if err := sysd.Start(serviceName); err != nil {
return err
}
if app.Socket {
socketName := filepath.Base(app.ServiceSocketFile())
// enable the socket
if err := sysd.Enable(socketName); err != nil {
return err
}
if err := sysd.Start(socketName); err != nil {
return err
}
}
}
return nil
}