302 lines
7.7 KiB
Go
302 lines
7.7 KiB
Go
// build linux
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package daemon
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import (
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"fmt"
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"io"
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"io/ioutil"
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"strings"
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"sync"
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log "github.com/Sirupsen/logrus"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/docker/docker/daemon/execdriver/lxc"
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"github.com/docker/docker/engine"
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"github.com/docker/docker/pkg/broadcastwriter"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/runconfig"
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"github.com/docker/docker/utils"
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)
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type execConfig struct {
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sync.Mutex
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ID string
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Running bool
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ProcessConfig execdriver.ProcessConfig
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StreamConfig
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OpenStdin bool
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OpenStderr bool
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OpenStdout bool
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Container *Container
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}
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type execStore struct {
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s map[string]*execConfig
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sync.Mutex
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}
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func newExecStore() *execStore {
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return &execStore{s: make(map[string]*execConfig, 0)}
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}
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func (e *execStore) Add(id string, execConfig *execConfig) {
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e.Lock()
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e.s[id] = execConfig
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e.Unlock()
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}
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func (e *execStore) Get(id string) *execConfig {
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e.Lock()
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res := e.s[id]
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e.Unlock()
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return res
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}
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func (e *execStore) Delete(id string) {
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e.Lock()
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delete(e.s, id)
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e.Unlock()
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}
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func (execConfig *execConfig) Resize(h, w int) error {
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return execConfig.ProcessConfig.Terminal.Resize(h, w)
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}
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func (d *Daemon) registerExecCommand(execConfig *execConfig) {
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// Storing execs in container inorder to kill them gracefully whenever the container is stopped or removed.
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execConfig.Container.execCommands.Add(execConfig.ID, execConfig)
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// Storing execs in daemon for easy access via remote API.
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d.execCommands.Add(execConfig.ID, execConfig)
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}
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func (d *Daemon) getExecConfig(name string) (*execConfig, error) {
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if execConfig := d.execCommands.Get(name); execConfig != nil {
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if !execConfig.Container.IsRunning() {
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return nil, fmt.Errorf("Container %s is not running", execConfig.Container.ID)
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}
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return execConfig, nil
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}
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return nil, fmt.Errorf("No such exec instance '%s' found in daemon", name)
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}
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func (d *Daemon) unregisterExecCommand(execConfig *execConfig) {
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execConfig.Container.execCommands.Delete(execConfig.ID)
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d.execCommands.Delete(execConfig.ID)
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}
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func (d *Daemon) getActiveContainer(name string) (*Container, error) {
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container := d.Get(name)
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if container == nil {
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return nil, fmt.Errorf("No such container: %s", name)
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}
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if !container.IsRunning() {
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return nil, fmt.Errorf("Container %s is not running", name)
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}
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return container, nil
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}
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func (d *Daemon) ContainerExecCreate(job *engine.Job) engine.Status {
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if len(job.Args) != 1 {
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return job.Errorf("Usage: %s [options] container command [args]", job.Name)
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}
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if strings.HasPrefix(d.execDriver.Name(), lxc.DriverName) {
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return job.Error(lxc.ErrExec)
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}
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var name = job.Args[0]
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container, err := d.getActiveContainer(name)
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if err != nil {
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return job.Error(err)
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}
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config := runconfig.ExecConfigFromJob(job)
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entrypoint, args := d.getEntrypointAndArgs(nil, config.Cmd)
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processConfig := execdriver.ProcessConfig{
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Privileged: config.Privileged,
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User: config.User,
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Tty: config.Tty,
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Entrypoint: entrypoint,
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Arguments: args,
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}
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execConfig := &execConfig{
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ID: utils.GenerateRandomID(),
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OpenStdin: config.AttachStdin,
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OpenStdout: config.AttachStdout,
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OpenStderr: config.AttachStderr,
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StreamConfig: StreamConfig{},
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ProcessConfig: processConfig,
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Container: container,
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Running: false,
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}
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d.registerExecCommand(execConfig)
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job.Printf("%s\n", execConfig.ID)
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return engine.StatusOK
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}
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func (d *Daemon) ContainerExecStart(job *engine.Job) engine.Status {
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if len(job.Args) != 1 {
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return job.Errorf("Usage: %s [options] exec", job.Name)
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}
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var (
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cStdin io.ReadCloser
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cStdout, cStderr io.Writer
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cStdinCloser io.Closer
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execName = job.Args[0]
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)
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execConfig, err := d.getExecConfig(execName)
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if err != nil {
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return job.Error(err)
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}
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func() {
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execConfig.Lock()
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defer execConfig.Unlock()
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if execConfig.Running {
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err = fmt.Errorf("Error: Exec command %s is already running", execName)
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}
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execConfig.Running = true
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}()
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if err != nil {
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return job.Error(err)
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}
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log.Debugf("starting exec command %s in container %s", execConfig.ID, execConfig.Container.ID)
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container := execConfig.Container
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if execConfig.OpenStdin {
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r, w := io.Pipe()
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go func() {
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defer w.Close()
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io.Copy(w, job.Stdin)
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}()
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cStdin = r
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cStdinCloser = job.Stdin
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}
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if execConfig.OpenStdout {
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cStdout = job.Stdout
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}
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if execConfig.OpenStderr {
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cStderr = job.Stderr
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}
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execConfig.StreamConfig.stderr = broadcastwriter.New()
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execConfig.StreamConfig.stdout = broadcastwriter.New()
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// Attach to stdin
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if execConfig.OpenStdin {
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execConfig.StreamConfig.stdin, execConfig.StreamConfig.stdinPipe = io.Pipe()
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} else {
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execConfig.StreamConfig.stdinPipe = ioutils.NopWriteCloser(ioutil.Discard) // Silently drop stdin
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}
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attachErr := d.attach(&execConfig.StreamConfig, execConfig.OpenStdin, false, execConfig.ProcessConfig.Tty, cStdin, cStdinCloser, cStdout, cStderr)
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execErr := make(chan error)
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// Remove exec from daemon and container.
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defer d.unregisterExecCommand(execConfig)
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go func() {
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err := container.Exec(execConfig)
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if err != nil {
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execErr <- fmt.Errorf("Cannot run exec command %s in container %s: %s", execName, container.ID, err)
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}
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}()
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select {
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case err := <-attachErr:
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if err != nil {
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return job.Errorf("attach failed with error: %s", err)
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}
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break
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case err := <-execErr:
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return job.Error(err)
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}
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return engine.StatusOK
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}
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func (d *Daemon) Exec(c *Container, execConfig *execConfig, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
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return d.execDriver.Exec(c.command, &execConfig.ProcessConfig, pipes, startCallback)
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}
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func (container *Container) Exec(execConfig *execConfig) error {
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container.Lock()
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defer container.Unlock()
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waitStart := make(chan struct{})
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callback := func(processConfig *execdriver.ProcessConfig, pid int) {
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if processConfig.Tty {
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// The callback is called after the process Start()
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// so we are in the parent process. In TTY mode, stdin/out/err is the PtySlave
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// which we close here.
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if c, ok := processConfig.Stdout.(io.Closer); ok {
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c.Close()
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}
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}
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close(waitStart)
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}
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// We use a callback here instead of a goroutine and an chan for
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// syncronization purposes
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cErr := promise.Go(func() error { return container.monitorExec(execConfig, callback) })
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// Exec should not return until the process is actually running
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select {
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case <-waitStart:
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case err := <-cErr:
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return err
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}
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return nil
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}
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func (container *Container) monitorExec(execConfig *execConfig, callback execdriver.StartCallback) error {
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var (
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err error
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exitCode int
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)
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pipes := execdriver.NewPipes(execConfig.StreamConfig.stdin, execConfig.StreamConfig.stdout, execConfig.StreamConfig.stderr, execConfig.OpenStdin)
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exitCode, err = container.daemon.Exec(container, execConfig, pipes, callback)
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if err != nil {
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log.Errorf("Error running command in existing container %s: %s", container.ID, err)
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}
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log.Debugf("Exec task in container %s exited with code %d", container.ID, exitCode)
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if execConfig.OpenStdin {
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if err := execConfig.StreamConfig.stdin.Close(); err != nil {
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log.Errorf("Error closing stdin while running in %s: %s", container.ID, err)
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}
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}
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if err := execConfig.StreamConfig.stdout.Clean(); err != nil {
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log.Errorf("Error closing stdout while running in %s: %s", container.ID, err)
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}
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if err := execConfig.StreamConfig.stderr.Clean(); err != nil {
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log.Errorf("Error closing stderr while running in %s: %s", container.ID, err)
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}
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if execConfig.ProcessConfig.Terminal != nil {
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if err := execConfig.ProcessConfig.Terminal.Close(); err != nil {
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log.Errorf("Error closing terminal while running in container %s: %s", container.ID, err)
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}
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}
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return err
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}
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