/
attach.go
87 lines (70 loc) · 1.91 KB
/
attach.go
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package client
import (
"fmt"
"io"
"net/url"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/engine"
flag "github.com/docker/docker/pkg/mflag"
"github.com/docker/docker/pkg/signal"
)
// CmdAttach attaches to a running container.
//
// Usage: docker attach [OPTIONS] CONTAINER
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)
cmd.ParseFlags(args, true)
name := cmd.Arg(0)
stream, _, err := cli.call("GET", "/containers/"+name+"/json", nil, nil)
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 {
logrus.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 &StatusError{StatusCode: status}
}
return nil
}