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 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 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, " "))
}