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 (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) 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
}