func (m *SnapManager) undoUnlinkCurrentSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
defer st.Unlock()
ss, snapst, err := snapSetupAndState(t)
if err != nil {
return err
}
oldInfo, err := readInfo(ss.Name, snapst.Current())
if err != nil {
return err
}
snapst.Active = true
st.Unlock()
err = m.backend.LinkSnap(oldInfo)
st.Lock()
if err != nil {
return err
}
// mark as active again
Set(st, ss.Name, snapst)
return nil
}
func (m *InterfaceManager) doDisconnect(task *state.Task, _ *tomb.Tomb) error {
st := task.State()
st.Lock()
defer st.Unlock()
plugRef, slotRef, err := getPlugAndSlotRefs(task)
if err != nil {
return err
}
conns, err := getConns(st)
if err != nil {
return err
}
err = m.repo.Disconnect(plugRef.Snap, plugRef.Name, slotRef.Snap, slotRef.Name)
if err != nil {
return err
}
plug := m.repo.Plug(plugRef.Snap, plugRef.Name)
slot := m.repo.Slot(slotRef.Snap, slotRef.Name)
if err := setupSnapSecurity(task, plug.Snap, m.repo); err != nil {
return state.Retry
}
if err := setupSnapSecurity(task, slot.Snap, m.repo); err != nil {
return state.Retry
}
delete(conns, connID(plugRef, slotRef))
setConns(st, conns)
return nil
}
func (m *SnapManager) doCopySnapData(t *state.Task, _ *tomb.Tomb) error {
t.State().Lock()
ss, snapst, err := snapSetupAndState(t)
t.State().Unlock()
if err != nil {
return err
}
newInfo, err := readInfo(ss.Name, snapst.Candidate)
if err != nil {
return err
}
var oldInfo *snap.Info
if cur := snapst.Current(); cur != nil {
var err error
oldInfo, err = readInfo(ss.Name, cur)
if err != nil {
return err
}
}
return m.backend.CopySnapData(newInfo, oldInfo, ss.Flags)
}
func (m *SnapManager) doMountSnap(t *state.Task, _ *tomb.Tomb) error {
t.State().Lock()
ss, snapst, err := snapSetupAndState(t)
t.State().Unlock()
if err != nil {
return err
}
var curInfo *snap.Info
if cur := snapst.Current(); cur != nil {
var err error
curInfo, err = readInfo(ss.Name, cur)
if err != nil {
return err
}
}
if err := m.backend.CheckSnap(ss.SnapPath, curInfo, ss.Flags); err != nil {
return err
}
// TODO Use ss.Revision to obtain the right info to mount
// instead of assuming the candidate is the right one.
return m.backend.SetupSnap(ss.SnapPath, snapst.Candidate, ss.Flags)
}
func (m *SnapManager) doUnlinkSnap(t *state.Task, _ *tomb.Tomb) error {
// invoked only if snap has a current active revision
st := t.State()
st.Lock()
defer st.Unlock()
ss, snapst, err := snapSetupAndState(t)
if err != nil {
return err
}
info, err := Info(t.State(), ss.Name, ss.Revision)
if err != nil {
return err
}
pb := &TaskProgressAdapter{task: t}
st.Unlock() // pb itself will ask for locking
err = m.backend.UnlinkSnap(info, pb)
st.Lock()
if err != nil {
return err
}
// mark as inactive
snapst.Active = false
Set(st, ss.Name, snapst)
return nil
}
func (m *SnapManager) doDiscardSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
ss, snapst, err := snapSetupAndState(t)
st.Unlock()
if err != nil {
return err
}
if len(snapst.Sequence) == 1 {
snapst.Sequence = nil
} else {
newSeq := make([]*snap.SideInfo, 0, len(snapst.Sequence))
for _, si := range snapst.Sequence {
if si.Revision == ss.Revision {
// leave out
continue
}
newSeq = append(newSeq, si)
}
snapst.Sequence = newSeq
}
pb := &TaskProgressAdapter{task: t}
err = m.backend.RemoveSnapFiles(ss.placeInfo(), pb)
if err != nil {
return err
}
st.Lock()
Set(st, ss.Name, snapst)
st.Unlock()
return nil
}
func (m *SnapManager) doPrepareSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
ss, snapst, err := snapSetupAndState(t)
st.Unlock()
if err != nil {
return err
}
if ss.Revision == 0 { // sideloading
// to not clash with not sideload installs
// and to not have clashes between them
// use incremental revisions starting at 100001
// for sideloads
revision := snapst.LocalRevision
if revision == 0 {
revision = firstLocalRevision
} else {
revision++
}
snapst.LocalRevision = revision
ss.Revision = revision
} else {
if err := checkRevisionIsNew(ss.Name, snapst, ss.Revision); err != nil {
return err
}
}
st.Lock()
t.Set("snap-setup", ss)
snapst.Candidate = &snap.SideInfo{Revision: ss.Revision}
Set(st, ss.Name, snapst)
st.Unlock()
return nil
}
func (m *SnapManager) doUnlinkCurrentSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
defer st.Unlock()
ss, snapst, err := snapSetupAndState(t)
if err != nil {
return err
}
oldInfo, err := readInfo(ss.Name, snapst.Current())
if err != nil {
return err
}
snapst.Active = false
pb := &TaskProgressAdapter{task: t}
st.Unlock() // pb itself will ask for locking
err = m.backend.UnlinkSnap(oldInfo, pb)
st.Lock()
if err != nil {
return err
}
// mark as inactive
Set(st, ss.Name, snapst)
return nil
}
func (m *SnapManager) undoMountSnap(t *state.Task, _ *tomb.Tomb) error {
t.State().Lock()
ss, err := TaskSnapSetup(t)
t.State().Unlock()
if err != nil {
return err
}
return m.backend.UndoSetupSnap(ss.placeInfo())
}
func getPlugAndSlotRefs(task *state.Task) (*interfaces.PlugRef, *interfaces.SlotRef, error) {
var plugRef interfaces.PlugRef
var slotRef interfaces.SlotRef
if err := task.Get("plug", &plugRef); err != nil {
return nil, nil, err
}
if err := task.Get("slot", &slotRef); err != nil {
return nil, nil, err
}
return &plugRef, &slotRef, nil
}
func snapSetupAndState(t *state.Task) (*SnapSetup, *SnapState, error) {
ss, err := TaskSnapSetup(t)
if err != nil {
return nil, nil, err
}
var snapst SnapState
err = Get(t.State(), ss.Name, &snapst)
if err != nil && err != state.ErrNoState {
return nil, nil, err
}
return ss, &snapst, nil
}
func removeSnapSecurity(task *state.Task, snapName string) error {
st := task.State()
for _, backend := range securityBackends {
st.Unlock()
err := backend.Remove(snapName)
st.Lock()
if err != nil {
task.Errorf("cannot setup %s for snap %q: %s", backend.Name(), snapName, err)
return err
}
}
return nil
}
func (m *SnapManager) undoPrepareSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
defer st.Unlock()
ss, snapst, err := snapSetupAndState(t)
if err != nil {
return err
}
snapst.Candidate = nil
Set(st, ss.Name, snapst)
return nil
}
func (m *SnapManager) undoCopySnapData(t *state.Task, _ *tomb.Tomb) error {
t.State().Lock()
ss, snapst, err := snapSetupAndState(t)
t.State().Unlock()
if err != nil {
return err
}
newInfo, err := readInfo(ss.Name, snapst.Candidate)
if err != nil {
return err
}
return m.backend.UndoCopySnapData(newInfo, ss.Flags)
}
func (m *SnapManager) doClearSnapData(t *state.Task, _ *tomb.Tomb) error {
t.State().Lock()
ss, err := TaskSnapSetup(t)
t.State().Unlock()
if err != nil {
return err
}
t.State().Lock()
info, err := Info(t.State(), ss.Name, ss.Revision)
t.State().Unlock()
if err != nil {
return err
}
return m.backend.RemoveSnapData(info)
}
func (m *SnapManager) doDownloadSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
ss, snapst, err := snapSetupAndState(t)
st.Unlock()
if err != nil {
return err
}
checker := func(info *snap.Info) error {
return checkRevisionIsNew(ss.Name, snapst, info.Revision)
}
pb := &TaskProgressAdapter{task: t}
var auther store.Authenticator
if ss.UserID > 0 {
st.Lock()
user, err := auth.User(st, ss.UserID)
st.Unlock()
if err != nil {
return err
}
auther = user.Authenticator()
}
storeInfo, downloadedSnapFile, err := m.backend.Download(ss.Name, ss.Channel, checker, pb, auther)
if err != nil {
return err
}
ss.SnapPath = downloadedSnapFile
ss.Revision = storeInfo.Revision
// update the snap setup and state for the follow up tasks
st.Lock()
t.Set("snap-setup", ss)
snapst.Candidate = &storeInfo.SideInfo
Set(st, ss.Name, snapst)
st.Unlock()
return nil
}
func (m *SnapManager) undoLinkSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
defer st.Unlock()
ss, snapst, err := snapSetupAndState(t)
if err != nil {
return err
}
var oldChannel string
err = t.Get("old-channel", &oldChannel)
if err != nil {
return err
}
// relinking of the old snap is done in the undo of unlink-current-snap
snapst.Candidate = snapst.Sequence[len(snapst.Sequence)-1]
snapst.Sequence = snapst.Sequence[:len(snapst.Sequence)-1]
snapst.Active = false
snapst.Channel = oldChannel
newInfo, err := readInfo(ss.Name, snapst.Candidate)
if err != nil {
return err
}
pb := &TaskProgressAdapter{task: t}
st.Unlock() // pb itself will ask for locking
err = m.backend.UnlinkSnap(newInfo, pb)
st.Lock()
if err != nil {
return err
}
// mark as inactive
Set(st, ss.Name, snapst)
return nil
}
func (m *InterfaceManager) doDiscardConns(task *state.Task, _ *tomb.Tomb) error {
st := task.State()
st.Lock()
defer st.Unlock()
snapSetup, err := snapstate.TaskSnapSetup(task)
if err != nil {
return err
}
snapName := snapSetup.Name
var snapState snapstate.SnapState
err = snapstate.Get(st, snapName, &snapState)
if err != nil && err != state.ErrNoState {
return err
}
if err == nil && len(snapState.Sequence) != 0 {
return fmt.Errorf("cannot discard connections for snap %q while it is present", snapName)
}
conns, err := getConns(st)
if err != nil {
return err
}
removed := make(map[string]connState)
for id := range conns {
plugRef, slotRef, err := parseConnID(id)
if err != nil {
return err
}
if plugRef.Snap == snapName || slotRef.Snap == snapName {
removed[id] = conns[id]
delete(conns, id)
}
}
task.Set("removed", removed)
setConns(st, conns)
return nil
}
func (m *InterfaceManager) autoConnect(task *state.Task, snapName string, blacklist map[string]bool) error {
var conns map[string]connState
err := task.State().Get("conns", &conns)
if err != nil && err != state.ErrNoState {
return err
}
if conns == nil {
conns = make(map[string]connState)
}
// XXX: quick hack, auto-connect everything
for _, plug := range m.repo.Plugs(snapName) {
if blacklist[plug.Name] {
continue
}
candidates := m.repo.AutoConnectCandidates(snapName, plug.Name)
if len(candidates) != 1 {
continue
}
slot := candidates[0]
if err := m.repo.Connect(snapName, plug.Name, slot.Snap.Name(), slot.Name); err != nil {
task.Logf("cannot auto connect %s:%s to %s:%s: %s",
snapName, plug.Name, slot.Snap.Name(), slot.Name, err)
}
key := fmt.Sprintf("%s:%s %s:%s", snapName, plug.Name, slot.Snap.Name(), slot.Name)
conns[key] = connState{Interface: plug.Interface, Auto: true}
}
task.State().Set("conns", conns)
return nil
}
func (m *SnapManager) doLinkSnap(t *state.Task, _ *tomb.Tomb) error {
st := t.State()
st.Lock()
defer st.Unlock()
ss, snapst, err := snapSetupAndState(t)
if err != nil {
return err
}
cand := snapst.Candidate
m.backend.Candidate(snapst.Candidate)
snapst.Sequence = append(snapst.Sequence, snapst.Candidate)
snapst.Candidate = nil
snapst.Active = true
oldChannel := snapst.Channel
if ss.Channel != "" {
snapst.Channel = ss.Channel
}
newInfo, err := readInfo(ss.Name, cand)
if err != nil {
return err
}
st.Unlock()
err = m.backend.LinkSnap(newInfo)
st.Lock()
if err != nil {
return err
}
t.Set("old-channel", oldChannel)
// Do at the end so we only preserve the new state if it worked.
Set(st, ss.Name, snapst)
return nil
}
func setupSnapSecurity(task *state.Task, snapInfo *snap.Info, repo *interfaces.Repository) error {
st := task.State()
var snapState snapstate.SnapState
snapName := snapInfo.Name()
if err := snapstate.Get(st, snapName, &snapState); err != nil {
task.Errorf("cannot get state of snap %q: %s", snapName, err)
return err
}
for _, backend := range securityBackends {
st.Unlock()
err := backend.Setup(snapInfo, snapState.DevMode(), repo)
st.Lock()
if err != nil {
task.Errorf("cannot setup %s for snap %q: %s", backend.Name(), snapName, err)
return err
}
}
return nil
}
func (m *InterfaceManager) undoDiscardConns(task *state.Task, _ *tomb.Tomb) error {
st := task.State()
st.Lock()
defer st.Unlock()
var removed map[string]connState
err := task.Get("removed", &removed)
if err != nil && err != state.ErrNoState {
return err
}
conns, err := getConns(st)
if err != nil {
return err
}
for id, connState := range removed {
conns[id] = connState
}
setConns(st, conns)
task.Set("removed", nil)
return nil
}
func TaskSnapSetup(t *state.Task) (*SnapSetup, error) {
var ss SnapSetup
err := t.Get("snap-setup", &ss)
if err != nil && err != state.ErrNoState {
return nil, err
}
if err == nil {
return &ss, nil
}
var id string
err = t.Get("snap-setup-task", &id)
if err != nil {
return nil, err
}
ts := t.State().Task(id)
if err := ts.Get("snap-setup", &ss); err != nil {
return nil, err
}
return &ss, nil
}
func (m *InterfaceManager) doRemoveProfiles(task *state.Task, _ *tomb.Tomb) error {
st := task.State()
st.Lock()
defer st.Unlock()
// Get SnapSetup for this snap. This is gives us the name of the snap.
snapSetup, err := snapstate.TaskSnapSetup(task)
if err != nil {
return err
}
snapName := snapSetup.Name
// Get SnapState for this snap
var snapState snapstate.SnapState
err = snapstate.Get(st, snapName, &snapState)
if err != nil && err != state.ErrNoState {
return err
}
// Get the old-devmode flag from the task.
// This flag is set by setup-profiles in case we have to undo.
var oldDevMode bool
err = task.Get("old-devmode", &oldDevMode)
if err != nil && err != state.ErrNoState {
return err
}
// Restore the state of DevMode flag if old-devmode was saved in the task.
if err == nil {
if oldDevMode {
snapState.Flags |= snapstate.DevMode
} else {
snapState.Flags &= ^snapstate.DevMode
}
snapstate.Set(st, snapName, &snapState)
}
// Disconnect the snap entirely.
// This is required to remove the snap from the interface repository.
// The returned list of affected snaps will need to have its security setup
// to reflect the change.
affectedSnaps, err := m.repo.DisconnectSnap(snapName)
if err != nil {
return err
}
// Setup security of the affected snaps.
for _, snapInfo := range affectedSnaps {
if snapInfo.Name() == snapName {
// Skip setup for the snap being removed as this is handled below.
continue
}
if err := setupSnapSecurity(task, snapInfo, m.repo); err != nil {
return state.Retry
}
}
// Remove the snap from the interface repository.
// This discards all the plugs and slots belonging to that snap.
if err := m.repo.RemoveSnap(snapName); err != nil {
return err
}
// Remove security artefacts of the snap.
if err := removeSnapSecurity(task, snapName); err != nil {
return state.Retry
}
return nil
}
func (m *InterfaceManager) doSetupProfiles(task *state.Task, _ *tomb.Tomb) error {
task.State().Lock()
defer task.State().Unlock()
// Get snap.Info from bits handed by the snap manager.
ss, err := snapstate.TaskSnapSetup(task)
if err != nil {
return err
}
snapInfo, err := snapstate.Info(task.State(), ss.Name, ss.Revision)
if err != nil {
return err
}
snap.AddImplicitSlots(snapInfo)
snapName := snapInfo.Name()
var snapState snapstate.SnapState
if err := snapstate.Get(task.State(), snapName, &snapState); err != nil {
task.Errorf("cannot get state of snap %q: %s", snapName, err)
return err
}
// Set DevMode flag if SnapSetup.Flags indicates it should be done
// but remember the old value in the task in case we undo.
task.Set("old-devmode", snapState.DevMode())
if ss.DevMode() {
snapState.Flags |= snapstate.DevMode
} else {
snapState.Flags &= ^snapstate.DevMode
}
snapstate.Set(task.State(), snapName, &snapState)
// The snap may have been updated so perform the following operation to
// ensure that we are always working on the correct state:
//
// - disconnect all connections to/from the given snap
// - remembering the snaps that were affected by this operation
// - remove the (old) snap from the interfaces repository
// - add the (new) snap to the interfaces repository
// - restore connections based on what is kept in the state
// - if a connection cannot be restored then remove it from the state
// - setup the security of all the affected snaps
blacklist := m.repo.AutoConnectBlacklist(snapName)
affectedSnaps, err := m.repo.DisconnectSnap(snapName)
if err != nil {
return err
}
// XXX: what about snap renames? We should remove the old name (or switch
// to IDs in the interfaces repository)
if err := m.repo.RemoveSnap(snapName); err != nil {
return err
}
if err := m.repo.AddSnap(snapInfo); err != nil {
if _, ok := err.(*interfaces.BadInterfacesError); ok {
logger.Noticef("%s", err)
} else {
return err
}
}
if err := m.reloadConnections(snapName); err != nil {
return err
}
if err := m.autoConnect(task, snapName, blacklist); err != nil {
return err
}
if len(affectedSnaps) == 0 {
affectedSnaps = append(affectedSnaps, snapInfo)
}
for _, snapInfo := range affectedSnaps {
if err := setupSnapSecurity(task, snapInfo, m.repo); err != nil {
return state.Retry
}
}
return nil
}
func doInstall(s *state.State, curActive bool, snapName, snapPath, channel string, userID int, flags snappy.InstallFlags) (*state.TaskSet, error) {
if err := checkChangeConflict(s, snapName); err != nil {
return nil, err
}
if snapPath == "" && channel == "" {
channel = "stable"
}
var prepare *state.Task
ss := SnapSetup{
Channel: channel,
UserID: userID,
Flags: int(flags),
}
ss.Name = snapName
ss.SnapPath = snapPath
if snapPath != "" {
prepare = s.NewTask("prepare-snap", fmt.Sprintf(i18n.G("Prepare snap %q"), snapPath))
} else {
prepare = s.NewTask("download-snap", fmt.Sprintf(i18n.G("Download snap %q from channel %q"), snapName, channel))
}
prepare.Set("snap-setup", ss)
tasks := []*state.Task{prepare}
addTask := func(t *state.Task) {
t.Set("snap-setup-task", prepare.ID())
tasks = append(tasks, t)
}
// mount
mount := s.NewTask("mount-snap", fmt.Sprintf(i18n.G("Mount snap %q"), snapName))
addTask(mount)
mount.WaitFor(prepare)
precopy := mount
if curActive {
// unlink-current-snap (will stop services for copy-data)
unlink := s.NewTask("unlink-current-snap", fmt.Sprintf(i18n.G("Make current revision for snap %q unavailable"), snapName))
addTask(unlink)
unlink.WaitFor(mount)
precopy = unlink
}
// copy-data (needs stopped services by unlink)
copyData := s.NewTask("copy-snap-data", fmt.Sprintf(i18n.G("Copy snap %q data"), snapName))
addTask(copyData)
copyData.WaitFor(precopy)
// security
setupSecurity := s.NewTask("setup-profiles", fmt.Sprintf(i18n.G("Setup snap %q security profiles"), snapName))
addTask(setupSecurity)
setupSecurity.WaitFor(copyData)
// finalize (wrappers+current symlink)
linkSnap := s.NewTask("link-snap", fmt.Sprintf(i18n.G("Make snap %q available to the system"), snapName))
addTask(linkSnap)
linkSnap.WaitFor(setupSecurity)
return state.NewTaskSet(tasks...), nil
}
