107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
package client
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import (
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"fmt"
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"io"
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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/signal"
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"github.com/docker/engine-api/types"
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)
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// CmdAttach attaches to a running container.
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//
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// Usage: docker attach [OPTIONS] CONTAINER
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func (cli *DockerCli) CmdAttach(args ...string) error {
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cmd := Cli.Subcmd("attach", []string{"CONTAINER"}, Cli.DockerCommands["attach"].Description, true)
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noStdin := cmd.Bool([]string{"-no-stdin"}, false, "Do not attach STDIN")
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proxy := cmd.Bool([]string{"-sig-proxy"}, true, "Proxy all received signals to the process")
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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.Exact, 1)
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cmd.ParseFlags(args, true)
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c, err := cli.client.ContainerInspect(cmd.Arg(0))
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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 fmt.Errorf("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 fmt.Errorf("You cannot attach to a paused container, unpause it first")
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}
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if err := cli.CheckTtyInput(!*noStdin, c.Config.Tty); err != nil {
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return err
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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: cmd.Arg(0),
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Stream: true,
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Stdin: !*noStdin && 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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if *proxy && !c.Config.Tty {
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sigc := cli.forwardAllSignals(options.ContainerID)
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defer signal.StopCatch(sigc)
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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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if in != nil && c.Config.Tty {
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if err := cli.setRawTerminal(); err != nil {
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return err
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}
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defer cli.restoreTerminal(in)
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}
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if c.Config.Tty && cli.isTerminalOut {
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height, width := cli.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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cli.resizeTtyTo(cmd.Arg(0), 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 := cli.monitorTtySize(cmd.Arg(0), 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 := cli.holdHijackedConnection(c.Config.Tty, in, cli.out, cli.err, resp); err != nil {
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return err
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}
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_, status, err := getExitCode(cli, options.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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return nil
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}
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