mirror of https://github.com/docker/cli.git
130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
package container
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import (
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"errors"
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"io"
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"net/http/httputil"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/cli"
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"github.com/docker/docker/cli/command"
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"github.com/docker/docker/pkg/signal"
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"github.com/spf13/cobra"
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"golang.org/x/net/context"
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)
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type attachOptions struct {
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noStdin bool
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proxy bool
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detachKeys string
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container string
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}
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// NewAttachCommand creates a new cobra.Command for `docker attach`
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func NewAttachCommand(dockerCli *command.DockerCli) *cobra.Command {
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var opts attachOptions
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cmd := &cobra.Command{
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Use: "attach [OPTIONS] CONTAINER",
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Short: "Attach to a running container",
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Args: cli.ExactArgs(1),
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RunE: func(cmd *cobra.Command, args []string) error {
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opts.container = args[0]
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return runAttach(dockerCli, &opts)
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},
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}
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flags := cmd.Flags()
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flags.BoolVar(&opts.noStdin, "no-stdin", false, "Do not attach STDIN")
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flags.BoolVar(&opts.proxy, "sig-proxy", true, "Proxy all received signals to the process")
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flags.StringVar(&opts.detachKeys, "detach-keys", "", "Override the key sequence for detaching a container")
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return cmd
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}
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func runAttach(dockerCli *command.DockerCli, opts *attachOptions) error {
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ctx := context.Background()
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client := dockerCli.Client()
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c, err := client.ContainerInspect(ctx, opts.container)
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if err != nil {
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return err
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}
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if !c.State.Running {
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return errors.New("You cannot attach to a stopped container, start it first")
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}
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if c.State.Paused {
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return errors.New("You cannot attach to a paused container, unpause it first")
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}
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if err := dockerCli.In().CheckTty(!opts.noStdin, c.Config.Tty); err != nil {
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return err
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}
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if opts.detachKeys != "" {
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dockerCli.ConfigFile().DetachKeys = opts.detachKeys
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}
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options := types.ContainerAttachOptions{
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Stream: true,
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Stdin: !opts.noStdin && c.Config.OpenStdin,
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Stdout: true,
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Stderr: true,
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DetachKeys: dockerCli.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 = dockerCli.In()
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}
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if opts.proxy && !c.Config.Tty {
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sigc := ForwardAllSignals(ctx, dockerCli, opts.container)
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defer signal.StopCatch(sigc)
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}
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resp, errAttach := client.ContainerAttach(ctx, opts.container, options)
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if errAttach != nil && errAttach != httputil.ErrPersistEOF {
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// ContainerAttach returns an ErrPersistEOF (connection closed)
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// means server met an error and put it in Hijacked connection
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// keep the error and read detailed error message from hijacked connection later
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return errAttach
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}
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defer resp.Close()
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if c.Config.Tty && dockerCli.Out().IsTerminal() {
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height, width := dockerCli.Out().GetTtySize()
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// To handle the case where a user repeatedly attaches/detaches without resizing their
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// terminal, the only way to get the shell prompt to display for attaches 2+ is to artificially
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// resize it, then go back to normal. Without this, every attach after the first will
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// require the user to manually resize or hit enter.
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resizeTtyTo(ctx, client, opts.container, height+1, width+1, false)
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// After the above resizing occurs, the call to MonitorTtySize below will handle resetting back
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// to the actual size.
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if err := MonitorTtySize(ctx, dockerCli, opts.container, false); err != nil {
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logrus.Debugf("Error monitoring TTY size: %s", err)
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}
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}
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if err := holdHijackedConnection(ctx, dockerCli, c.Config.Tty, in, dockerCli.Out(), dockerCli.Err(), resp); err != nil {
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return err
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}
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if errAttach != nil {
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return errAttach
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}
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_, status, err := getExitCode(ctx, dockerCli, opts.container)
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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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return nil
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}
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