Example #1
0
func (e *BasicExecutor) Start() error {
	// Parse the commands arguments and replace instances of Nomad environment
	// variables.
	envVars, err := environment.ParseFromList(e.cmd.Env)
	if err != nil {
		return err
	}

	e.cmd.Path = args.ReplaceEnv(e.cmd.Path, envVars.Map())
	combined := strings.Join(e.cmd.Args, " ")
	parsed, err := args.ParseAndReplace(combined, envVars.Map())
	if err != nil {
		return err
	}
	e.cmd.Args = parsed

	spawnState := filepath.Join(e.allocDir, fmt.Sprintf("%s_%s", e.taskName, "exit_status"))
	e.spawn = spawn.NewSpawner(spawnState)
	e.spawn.SetCommand(&e.cmd)
	e.spawn.SetLogs(&spawn.Logs{
		Stdout: filepath.Join(e.taskDir, allocdir.TaskLocal, fmt.Sprintf("%v.stdout", e.taskName)),
		Stderr: filepath.Join(e.taskDir, allocdir.TaskLocal, fmt.Sprintf("%v.stderr", e.taskName)),
		Stdin:  os.DevNull,
	})

	return e.spawn.Spawn(nil)
}
Example #2
0
func (e *LinuxExecutor) Start() error {
	// Run as "nobody" user so we don't leak root privilege to the spawned
	// process.
	if err := e.runAs("nobody"); err != nil {
		return err
	}

	// Parse the commands arguments and replace instances of Nomad environment
	// variables.
	envVars, err := environment.ParseFromList(e.cmd.Env)
	if err != nil {
		return err
	}

	e.cmd.Path = args.ReplaceEnv(e.cmd.Path, envVars.Map())
	combined := strings.Join(e.cmd.Args, " ")
	parsed, err := args.ParseAndReplace(combined, envVars.Map())
	if err != nil {
		return err
	}
	e.cmd.Args = parsed

	spawnState := filepath.Join(e.allocDir, fmt.Sprintf("%s_%s", e.taskName, "exit_status"))
	e.spawn = spawn.NewSpawner(spawnState)
	e.spawn.SetCommand(&e.cmd)
	e.spawn.SetChroot(e.taskDir)
	e.spawn.SetLogs(&spawn.Logs{
		Stdout: filepath.Join(e.taskDir, allocdir.TaskLocal, fmt.Sprintf("%v.stdout", e.taskName)),
		Stderr: filepath.Join(e.taskDir, allocdir.TaskLocal, fmt.Sprintf("%v.stderr", e.taskName)),
		Stdin:  os.DevNull,
	})

	enterCgroup := func(pid int) error {
		// Join the spawn-daemon to the cgroup.
		manager := e.getCgroupManager(e.groups)

		// Apply will place the spawn dameon into the created cgroups.
		if err := manager.Apply(pid); err != nil {
			return fmt.Errorf("Failed to join spawn-daemon to the cgroup (%+v): %v", e.groups, err)
		}

		return nil
	}

	return e.spawn.Spawn(enterCgroup)
}