зеркало из https://github.com/microsoft/docker.git
269 строки
7.4 KiB
Go
269 строки
7.4 KiB
Go
package daemon
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import (
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"fmt"
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"io"
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"strings"
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"time"
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"golang.org/x/net/context"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/container"
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"github.com/docker/docker/daemon/exec"
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"github.com/docker/docker/errors"
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"github.com/docker/docker/libcontainerd"
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"github.com/docker/docker/pkg/pools"
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"github.com/docker/docker/pkg/signal"
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"github.com/docker/docker/pkg/term"
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"github.com/docker/engine-api/types"
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"github.com/docker/engine-api/types/strslice"
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)
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// Seconds to wait after sending TERM before trying KILL
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const termProcessTimeout = 10
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func (d *Daemon) registerExecCommand(container *container.Container, config *exec.Config) {
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// Storing execs in container in order to kill them gracefully whenever the container is stopped or removed.
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container.ExecCommands.Add(config.ID, config)
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// Storing execs in daemon for easy access via remote API.
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d.execCommands.Add(config.ID, config)
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}
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// ExecExists looks up the exec instance and returns a bool if it exists or not.
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// It will also return the error produced by `getConfig`
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func (d *Daemon) ExecExists(name string) (bool, error) {
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if _, err := d.getExecConfig(name); err != nil {
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return false, err
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}
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return true, nil
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}
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// getExecConfig looks up the exec instance by name. If the container associated
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// with the exec instance is stopped or paused, it will return an error.
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func (d *Daemon) getExecConfig(name string) (*exec.Config, error) {
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ec := d.execCommands.Get(name)
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// If the exec is found but its container is not in the daemon's list of
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// containers then it must have been deleted, in which case instead of
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// saying the container isn't running, we should return a 404 so that
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// the user sees the same error now that they will after the
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// 5 minute clean-up loop is run which erases old/dead execs.
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if ec != nil {
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if container := d.containers.Get(ec.ContainerID); container != nil {
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if !container.IsRunning() {
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return nil, fmt.Errorf("Container %s is not running: %s", container.ID, container.State.String())
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}
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if container.IsPaused() {
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return nil, errExecPaused(container.ID)
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}
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if container.IsRestarting() {
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return nil, errContainerIsRestarting(container.ID)
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}
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return ec, nil
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}
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}
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return nil, errExecNotFound(name)
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}
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func (d *Daemon) unregisterExecCommand(container *container.Container, execConfig *exec.Config) {
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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.Container, error) {
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container, err := d.GetContainer(name)
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if err != nil {
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return nil, err
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}
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if !container.IsRunning() {
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return nil, errNotRunning{container.ID}
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}
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if container.IsPaused() {
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return nil, errExecPaused(name)
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}
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if container.IsRestarting() {
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return nil, errContainerIsRestarting(container.ID)
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}
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return container, nil
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}
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// ContainerExecCreate sets up an exec in a running container.
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func (d *Daemon) ContainerExecCreate(name string, config *types.ExecConfig) (string, error) {
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container, err := d.getActiveContainer(name)
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if err != nil {
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return "", err
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}
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cmd := strslice.StrSlice(config.Cmd)
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entrypoint, args := d.getEntrypointAndArgs(strslice.StrSlice{}, cmd)
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keys := []byte{}
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if config.DetachKeys != "" {
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keys, err = term.ToBytes(config.DetachKeys)
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if err != nil {
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err = fmt.Errorf("Invalid escape keys (%s) provided", config.DetachKeys)
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return "", err
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}
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}
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execConfig := exec.NewConfig()
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execConfig.OpenStdin = config.AttachStdin
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execConfig.OpenStdout = config.AttachStdout
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execConfig.OpenStderr = config.AttachStderr
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execConfig.ContainerID = container.ID
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execConfig.DetachKeys = keys
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execConfig.Entrypoint = entrypoint
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execConfig.Args = args
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execConfig.Tty = config.Tty
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execConfig.Privileged = config.Privileged
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execConfig.User = config.User
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if len(execConfig.User) == 0 {
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execConfig.User = container.Config.User
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}
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d.registerExecCommand(container, execConfig)
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d.LogContainerEvent(container, "exec_create: "+execConfig.Entrypoint+" "+strings.Join(execConfig.Args, " "))
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return execConfig.ID, nil
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}
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// ContainerExecStart starts a previously set up exec instance. The
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// std streams are set up.
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// If ctx is cancelled, the process is terminated.
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func (d *Daemon) ContainerExecStart(ctx context.Context, name string, stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) (err error) {
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var (
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cStdin io.ReadCloser
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cStdout, cStderr io.Writer
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)
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ec, err := d.getExecConfig(name)
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if err != nil {
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return errExecNotFound(name)
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}
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ec.Lock()
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if ec.ExitCode != nil {
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ec.Unlock()
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err := fmt.Errorf("Error: Exec command %s has already run", ec.ID)
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return errors.NewRequestConflictError(err)
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}
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if ec.Running {
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ec.Unlock()
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return fmt.Errorf("Error: Exec command %s is already running", ec.ID)
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}
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ec.Running = true
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defer func() {
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if err != nil {
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ec.Running = false
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exitCode := 126
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ec.ExitCode = &exitCode
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}
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}()
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ec.Unlock()
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c := d.containers.Get(ec.ContainerID)
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logrus.Debugf("starting exec command %s in container %s", ec.ID, c.ID)
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d.LogContainerEvent(c, "exec_start: "+ec.Entrypoint+" "+strings.Join(ec.Args, " "))
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if ec.OpenStdin && stdin != nil {
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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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defer logrus.Debug("Closing buffered stdin pipe")
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pools.Copy(w, stdin)
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}()
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cStdin = r
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}
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if ec.OpenStdout {
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cStdout = stdout
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}
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if ec.OpenStderr {
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cStderr = stderr
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}
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if ec.OpenStdin {
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ec.NewInputPipes()
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} else {
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ec.NewNopInputPipe()
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}
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p := libcontainerd.Process{
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Args: append([]string{ec.Entrypoint}, ec.Args...),
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Terminal: ec.Tty,
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}
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if err := execSetPlatformOpt(c, ec, &p); err != nil {
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return err
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}
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attachErr := container.AttachStreams(ctx, ec.StreamConfig, ec.OpenStdin, true, ec.Tty, cStdin, cStdout, cStderr, ec.DetachKeys)
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if err := d.containerd.AddProcess(ctx, c.ID, name, p); err != nil {
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return err
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}
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select {
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case <-ctx.Done():
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logrus.Debugf("Sending TERM signal to process %v in container %v", name, c.ID)
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d.containerd.SignalProcess(c.ID, name, int(signal.SignalMap["TERM"]))
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select {
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case <-time.After(termProcessTimeout * time.Second):
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logrus.Infof("Container %v, process %v failed to exit within %d seconds of signal TERM - using the force", c.ID, name, termProcessTimeout)
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d.containerd.SignalProcess(c.ID, name, int(signal.SignalMap["KILL"]))
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case <-attachErr:
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// TERM signal worked
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}
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return fmt.Errorf("context cancelled")
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case err := <-attachErr:
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if err != nil {
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if _, ok := err.(container.DetachError); !ok {
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return fmt.Errorf("exec attach failed with error: %v", err)
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}
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d.LogContainerEvent(c, "exec_detach")
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}
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}
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return nil
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}
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// execCommandGC runs a ticker to clean up the daemon references
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// of exec configs that are no longer part of the container.
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func (d *Daemon) execCommandGC() {
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for range time.Tick(5 * time.Minute) {
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var (
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cleaned int
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liveExecCommands = d.containerExecIds()
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)
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for id, config := range d.execCommands.Commands() {
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if config.CanRemove {
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cleaned++
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d.execCommands.Delete(id)
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} else {
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if _, exists := liveExecCommands[id]; !exists {
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config.CanRemove = true
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}
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}
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}
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if cleaned > 0 {
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logrus.Debugf("clean %d unused exec commands", cleaned)
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}
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}
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}
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// containerExecIds returns a list of all the current exec ids that are in use
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// and running inside a container.
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func (d *Daemon) containerExecIds() map[string]struct{} {
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ids := map[string]struct{}{}
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for _, c := range d.containers.List() {
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for _, id := range c.ExecCommands.List() {
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ids[id] = struct{}{}
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}
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}
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return ids
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}
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