// changeInterfaces controls the interfaces system.
// Plugs can be connected to and disconnected from slots.
// When enableInternalInterfaceActions is true plugs and slots can also be
// explicitly added and removed.
func changeInterfaces(c *Command, r *http.Request) Response {
var a interfaceAction
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(&a); err != nil {
return BadRequest("cannot decode request body into an interface action: %v", err)
}
if a.Action == "" {
return BadRequest("interface action not specified")
}
if !c.d.enableInternalInterfaceActions && a.Action != "connect" && a.Action != "disconnect" {
return BadRequest("internal interface actions are disabled")
}
if len(a.Plugs) > 1 || len(a.Slots) > 1 {
return NotImplemented("many-to-many operations are not implemented")
}
if a.Action != "connect" && a.Action != "disconnect" {
return BadRequest("unsupported interface action: %q", a.Action)
}
if len(a.Plugs) == 0 || len(a.Slots) == 0 {
return BadRequest("at least one plug and slot is required")
}
var change *state.Change
var taskset *state.TaskSet
var err error
state := c.d.overlord.State()
state.Lock()
defer state.Unlock()
switch a.Action {
case "connect":
summary := fmt.Sprintf("Connect %s:%s to %s:%s", a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
change = state.NewChange("connect-snap", summary)
taskset, err = ifacestate.Connect(state, a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
case "disconnect":
summary := fmt.Sprintf("Disconnect %s:%s from %s:%s", a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
change = state.NewChange("disconnect-snap", summary)
taskset, err = ifacestate.Disconnect(state, a.Plugs[0].Snap, a.Plugs[0].Name, a.Slots[0].Snap, a.Slots[0].Name)
}
if err == nil {
change.AddAll(taskset)
}
if err != nil {
return BadRequest("%v", err)
}
state.EnsureBefore(0)
return AsyncResponse(nil, &Meta{Change: change.ID()})
}
func ensureUbuntuCore(chg *state.Change, userID int) error {
var ss snapstate.SnapState
ubuntuCore := "ubuntu-core"
err := snapstateGet(chg.State(), ubuntuCore, &ss)
if err != state.ErrNoState {
return err
}
// FIXME: workaround because we are not fully state based yet
installed, err := (&snappy.Overlord{}).Installed()
snaps := snappy.FindSnapsByName(ubuntuCore, installed)
if len(snaps) > 0 {
return nil
}
return installSnap(chg, ubuntuCore, "stable", userID, 0)
}
func waitChange(chg *state.Change) error {
select {
case <-chg.Ready():
}
// TODO case <-daemon.Dying():
st := chg.State()
st.Lock()
defer st.Unlock()
return chg.Err()
}
func installSnap(chg *state.Change, name, channel string, userID int, flags snappy.InstallFlags) error {
st := chg.State()
ts, err := snapstateInstall(st, name, channel, userID, flags)
if err != nil {
return err
}
// ensure that each of our task runs after the existing tasks
chgts := state.NewTaskSet(chg.Tasks()...)
for _, t := range ts.Tasks() {
t.WaitAll(chgts)
}
chg.AddAll(ts)
return nil
}
func ensureChange(c *C, r *state.TaskRunner, sb *stateBackend, chg *state.Change) {
for i := 0; i < 10; i++ {
sb.ensureBefore = time.Hour
r.Ensure()
r.Wait()
chg.State().Lock()
s := chg.Status()
chg.State().Unlock()
if s.Ready() {
return
}
if sb.ensureBefore > 0 {
break
}
}
var statuses []string
chg.State().Lock()
for _, t := range chg.Tasks() {
statuses = append(statuses, t.Summary()+":"+t.Status().String())
}
chg.State().Unlock()
c.Fatalf("Change didn't reach final state without blocking: %s", strings.Join(statuses, " "))
}
func change2changeInfo(chg *state.Change) *changeInfo {
status := chg.Status()
chgInfo := &changeInfo{
ID: chg.ID(),
Kind: chg.Kind(),
Summary: chg.Summary(),
Status: status.String(),
Ready: status.Ready(),
SpawnTime: chg.SpawnTime(),
}
readyTime := chg.ReadyTime()
if !readyTime.IsZero() {
chgInfo.ReadyTime = &readyTime
}
if err := chg.Err(); err != nil {
chgInfo.Err = err.Error()
}
tasks := chg.Tasks()
taskInfos := make([]*taskInfo, len(tasks))
for j, t := range tasks {
done, total := t.Progress()
taskInfo := &taskInfo{
ID: t.ID(),
Kind: t.Kind(),
Summary: t.Summary(),
Status: t.Status().String(),
Log: t.Log(),
Progress: taskInfoProgress{
Done: done,
Total: total,
},
SpawnTime: t.SpawnTime(),
}
readyTime := t.ReadyTime()
if !readyTime.IsZero() {
taskInfo.ReadyTime = &readyTime
}
taskInfos[j] = taskInfo
}
chgInfo.Tasks = taskInfos
return chgInfo
}