api/client - The code for all cli commands are in one file #11610

Signed-off-by: Joey Gibson <joey@joeygibson.com>
Upstream-commit: 58690c9cca5995035b721ed6f1337b0ddb932d7a
Component: engine

components/engine/api/client/attach.go

@@ -0,0 +1,85 @@
+package client
+
+import (
+	"fmt"
+	"io"
+	"net/url"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/docker/docker/engine"
+	flag "github.com/docker/docker/pkg/mflag"
+	"github.com/docker/docker/pkg/signal"
+	"github.com/docker/docker/utils"
+)
+
+func (cli *DockerCli) CmdAttach(args ...string) error {
+	var (
+		cmd     = cli.Subcmd("attach", "CONTAINER", "Attach to a running container", true)
+		noStdin = cmd.Bool([]string{"#nostdin", "-no-stdin"}, false, "Do not attach STDIN")
+		proxy   = cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy all received signals to the process")
+	)
+	cmd.Require(flag.Exact, 1)
+
+	utils.ParseFlags(cmd, args, true)
+	name := cmd.Arg(0)
+
+	stream, _, err := cli.call("GET", "/containers/"+name+"/json", nil, false)
+	if err != nil {
+		return err
+	}
+
+	env := engine.Env{}
+	if err := env.Decode(stream); err != nil {
+		return err
+	}
+
+	if !env.GetSubEnv("State").GetBool("Running") {
+		return fmt.Errorf("You cannot attach to a stopped container, start it first")
+	}
+
+	var (
+		config = env.GetSubEnv("Config")
+		tty    = config.GetBool("Tty")
+	)
+
+	if err := cli.CheckTtyInput(!*noStdin, tty); err != nil {
+		return err
+	}
+
+	if tty && cli.isTerminalOut {
+		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
+			log.Debugf("Error monitoring TTY size: %s", err)
+		}
+	}
+
+	var in io.ReadCloser
+
+	v := url.Values{}
+	v.Set("stream", "1")
+	if !*noStdin && config.GetBool("OpenStdin") {
+		v.Set("stdin", "1")
+		in = cli.in
+	}
+
+	v.Set("stdout", "1")
+	v.Set("stderr", "1")
+
+	if *proxy && !tty {
+		sigc := cli.forwardAllSignals(cmd.Arg(0))
+		defer signal.StopCatch(sigc)
+	}
+
+	if err := cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), tty, in, cli.out, cli.err, nil, nil); err != nil {
+		return err
+	}
+
+	_, status, err := getExitCode(cli, cmd.Arg(0))
+	if err != nil {
+		return err
+	}
+	if status != 0 {
+		return &utils.StatusError{StatusCode: status}
+	}
+
+	return nil
+}