Ejemplo n.º 1
0
func (d *driver) generateEnvConfig(c *execdriver.Command) error {
	data, err := json.Marshal(c.Env)
	if err != nil {
		return err
	}
	p := path.Join(d.root, "containers", c.ID, "config.env")
	c.Mounts = append(c.Mounts, execdriver.Mount{p, "/.dockerenv", false, true})

	return ioutil.WriteFile(p, data, 0600)
}
Ejemplo n.º 2
0
func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
	var (
		term execdriver.Terminal
		err  error
	)

	if c.Tty {
		term, err = NewTtyConsole(c, pipes)
	} else {
		term, err = execdriver.NewStdConsole(c, pipes)
	}
	c.Terminal = term

	c.Mounts = append(c.Mounts, execdriver.Mount{d.initPath, c.InitPath, false, true})

	if err := d.generateEnvConfig(c); err != nil {
		return -1, err
	}
	configPath, err := d.generateLXCConfig(c)
	if err != nil {
		return -1, err
	}
	params := []string{
		"lxc-start",
		"-n", c.ID,
		"-f", configPath,
		"--",
		c.InitPath,
		"-driver",
		DriverName,
	}

	if c.Network.Interface != nil {
		params = append(params,
			"-g", c.Network.Interface.Gateway,
			"-i", fmt.Sprintf("%s/%d", c.Network.Interface.IPAddress, c.Network.Interface.IPPrefixLen),
		)
	}
	params = append(params,
		"-mtu", strconv.Itoa(c.Network.Mtu),
	)

	if c.User != "" {
		params = append(params, "-u", c.User)
	}

	if c.Privileged {
		if d.apparmor {
			params[0] = path.Join(d.root, "lxc-start-unconfined")

		}
		params = append(params, "-privileged")
	}

	if c.WorkingDir != "" {
		params = append(params, "-w", c.WorkingDir)
	}

	if len(c.CapAdd) > 0 {
		params = append(params, "-cap-add", strings.Join(c.CapAdd, " "))
	}

	if len(c.CapDrop) > 0 {
		params = append(params, "-cap-drop", strings.Join(c.CapDrop, " "))
	}

	params = append(params, "--", c.Entrypoint)
	params = append(params, c.Arguments...)

	if d.sharedRoot {
		// lxc-start really needs / to be non-shared, or all kinds of stuff break
		// when lxc-start unmount things and those unmounts propagate to the main
		// mount namespace.
		// What we really want is to clone into a new namespace and then
		// mount / MS_REC|MS_SLAVE, but since we can't really clone or fork
		// without exec in go we have to do this horrible shell hack...
		shellString :=
			"mount --make-rslave /; exec " +
				utils.ShellQuoteArguments(params)

		params = []string{
			"unshare", "-m", "--", "/bin/sh", "-c", shellString,
		}
	}

	var (
		name = params[0]
		arg  = params[1:]
	)
	aname, err := exec.LookPath(name)
	if err != nil {
		aname = name
	}
	c.Path = aname
	c.Args = append([]string{name}, arg...)

	if err := nodes.CreateDeviceNodes(c.Rootfs, c.AutoCreatedDevices); err != nil {
		return -1, err
	}

	if err := c.Start(); err != nil {
		return -1, err
	}

	var (
		waitErr  error
		waitLock = make(chan struct{})
	)

	go func() {
		if err := c.Wait(); err != nil {
			if _, ok := err.(*exec.ExitError); !ok { // Do not propagate the error if it's simply a status code != 0
				waitErr = err
			}
		}
		close(waitLock)
	}()

	// Poll lxc for RUNNING status
	pid, err := d.waitForStart(c, waitLock)
	if err != nil {
		if c.Process != nil {
			c.Process.Kill()
			c.Wait()
		}
		return -1, err
	}

	c.ContainerPid = pid

	if startCallback != nil {
		startCallback(c)
	}

	<-waitLock

	return getExitCode(c), waitErr
}