// Run runs a machine agent.
func (a *MachineAgent) Run(_ *cmd.Context) error {
// Due to changes in the logging, and needing to care about old
// environments that have been upgraded, we need to explicitly remove the
// file writer if one has been added, otherwise we will get duplicate
// lines of all logging in the log file.
loggo.RemoveWriter("logfile")
defer a.tomb.Done()
logger.Infof("machine agent %v start (%s [%s])", a.Tag(), version.Current, runtime.Compiler)
if err := a.ReadConfig(a.Tag()); err != nil {
return fmt.Errorf("cannot read agent configuration: %v", err)
}
a.configChangedVal.Set(struct{}{})
agentConfig := a.CurrentConfig()
charm.CacheDir = filepath.Join(agentConfig.DataDir(), "charmcache")
if err := a.createJujuRun(agentConfig.DataDir()); err != nil {
return fmt.Errorf("cannot create juju run symlink: %v", err)
}
a.runner.StartWorker("api", a.APIWorker)
a.runner.StartWorker("statestarter", a.newStateStarterWorker)
a.runner.StartWorker("termination", func() (worker.Worker, error) {
return terminationworker.NewWorker(), nil
})
// At this point, all workers will have been configured to start
close(a.workersStarted)
err := a.runner.Wait()
if err == worker.ErrTerminateAgent {
err = a.uninstallAgent(agentConfig)
}
err = agentDone(err)
a.tomb.Kill(err)
return err
}
func (s *TerminationWorkerSuite) TestSignal(c *gc.C) {
w := terminationworker.NewWorker()
proc, err := os.FindProcess(os.Getpid())
c.Assert(err, gc.IsNil)
defer proc.Release()
err = proc.Signal(terminationworker.TerminationSignal)
c.Assert(err, gc.IsNil)
err = w.Wait()
c.Assert(err, gc.Equals, worker.ErrTerminateAgent)
}
func (s *TerminationWorkerSuite) TestStartStop(c *gc.C) {
w := terminationworker.NewWorker()
w.Kill()
err := w.Wait()
c.Assert(err, gc.IsNil)
}