// runHook executes the supplied hook.Info in an appropriate hook context. If
// the hook itself fails to execute, it returns errHookFailed.
func (u *Uniter) runHook(hi hook.Info) (err error) {
// Prepare context.
if err = hi.Validate(); err != nil {
return err
}
hookName := string(hi.Kind)
relationId := -1
if hi.Kind.IsRelation() {
relationId = hi.RelationId
if hookName, err = u.relationers[relationId].PrepareHook(hi); err != nil {
return err
}
}
hctxId := fmt.Sprintf("%s:%s:%d", u.unit.Name(), hookName, u.rand.Int63())
lockMessage := fmt.Sprintf("%s: running hook %q", u.unit.Name(), hookName)
if err = u.acquireHookLock(lockMessage); err != nil {
return err
}
defer u.hookLock.Unlock()
hctx, err := u.getHookContext(hctxId, relationId, hi.RemoteUnit)
if err != nil {
return err
}
srv, socketPath, err := u.startJujucServer(hctx)
if err != nil {
return err
}
defer srv.Close()
// Run the hook.
if err := u.writeState(RunHook, Pending, &hi, nil); err != nil {
return err
}
logger.Infof("running %q hook", hookName)
ranHook := true
err = hctx.RunHook(hookName, u.charmPath, u.toolsDir, socketPath)
if IsMissingHookError(err) {
ranHook = false
} else if err != nil {
logger.Errorf("hook failed: %s", err)
u.notifyHookFailed(hookName, hctx)
return errHookFailed
}
if err := u.writeState(RunHook, Done, &hi, nil); err != nil {
return err
}
if ranHook {
logger.Infof("ran %q hook", hookName)
u.notifyHookCompleted(hookName, hctx)
} else {
logger.Infof("skipped %q hook (missing)", hookName)
}
return u.commitHook(hi)
}
