150 lines
3.7 KiB
Go
150 lines
3.7 KiB
Go
package client
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import (
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/Sirupsen/logrus"
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Cli "github.com/docker/docker/cli"
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flag "github.com/docker/docker/pkg/mflag"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/pkg/signal"
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"github.com/docker/engine-api/types"
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)
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func (cli *DockerCli) forwardAllSignals(cid string) chan os.Signal {
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sigc := make(chan os.Signal, 128)
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signal.CatchAll(sigc)
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go func() {
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for s := range sigc {
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if s == signal.SIGCHLD {
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continue
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}
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var sig string
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for sigStr, sigN := range signal.SignalMap {
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if sigN == s {
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sig = sigStr
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break
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}
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}
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if sig == "" {
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fmt.Fprintf(cli.err, "Unsupported signal: %v. Discarding.\n", s)
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continue
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}
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if err := cli.client.ContainerKill(cid, sig); err != nil {
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logrus.Debugf("Error sending signal: %s", err)
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}
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}
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}()
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return sigc
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}
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// CmdStart starts one or more containers.
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//
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// Usage: docker start [OPTIONS] CONTAINER [CONTAINER...]
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func (cli *DockerCli) CmdStart(args ...string) error {
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cmd := Cli.Subcmd("start", []string{"CONTAINER [CONTAINER...]"}, Cli.DockerCommands["start"].Description, true)
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attach := cmd.Bool([]string{"a", "-attach"}, false, "Attach STDOUT/STDERR and forward signals")
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openStdin := cmd.Bool([]string{"i", "-interactive"}, false, "Attach container's STDIN")
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detachKeys := cmd.String([]string{"-detach-keys"}, "", "Override the key sequence for detaching a container")
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cmd.Require(flag.Min, 1)
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cmd.ParseFlags(args, true)
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if *attach || *openStdin {
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// We're going to attach to a container.
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// 1. Ensure we only have one container.
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if cmd.NArg() > 1 {
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return fmt.Errorf("You cannot start and attach multiple containers at once.")
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}
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// 2. Attach to the container.
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containerID := cmd.Arg(0)
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c, err := cli.client.ContainerInspect(containerID)
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if err != nil {
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return err
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}
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if !c.Config.Tty {
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sigc := cli.forwardAllSignals(containerID)
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defer signal.StopCatch(sigc)
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}
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if *detachKeys != "" {
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cli.configFile.DetachKeys = *detachKeys
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}
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options := types.ContainerAttachOptions{
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ContainerID: containerID,
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Stream: true,
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Stdin: *openStdin && c.Config.OpenStdin,
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Stdout: true,
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Stderr: true,
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DetachKeys: cli.configFile.DetachKeys,
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}
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var in io.ReadCloser
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if options.Stdin {
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in = cli.in
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}
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resp, err := cli.client.ContainerAttach(options)
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if err != nil {
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return err
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}
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defer resp.Close()
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cErr := promise.Go(func() error {
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return cli.holdHijackedConnection(c.Config.Tty, in, cli.out, cli.err, resp)
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})
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// 3. Start the container.
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if err := cli.client.ContainerStart(containerID); err != nil {
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return err
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}
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// 4. Wait for attachment to break.
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if c.Config.Tty && cli.isTerminalOut {
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if err := cli.monitorTtySize(containerID, false); err != nil {
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fmt.Fprintf(cli.err, "Error monitoring TTY size: %s\n", err)
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}
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}
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if attchErr := <-cErr; attchErr != nil {
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return attchErr
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}
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_, status, err := getExitCode(cli, containerID)
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if err != nil {
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return err
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}
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if status != 0 {
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return Cli.StatusError{StatusCode: status}
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}
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} else {
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// We're not going to attach to anything.
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// Start as many containers as we want.
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return cli.startContainersWithoutAttachments(cmd.Args())
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}
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return nil
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}
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func (cli *DockerCli) startContainersWithoutAttachments(containerIDs []string) error {
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var failedContainers []string
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for _, containerID := range containerIDs {
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if err := cli.client.ContainerStart(containerID); err != nil {
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fmt.Fprintf(cli.err, "%s\n", err)
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failedContainers = append(failedContainers, containerID)
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} else {
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fmt.Fprintf(cli.out, "%s\n", containerID)
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}
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}
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if len(failedContainers) > 0 {
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return fmt.Errorf("Error: failed to start containers: %v", strings.Join(failedContainers, ", "))
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}
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return nil
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}
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