github.com/rentongzhang/docker@v1.8.2-rc1/api/client/attach.go (about)

     1  package client
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"io"
     7  	"net/url"
     8  
     9  	"github.com/Sirupsen/logrus"
    10  	"github.com/docker/docker/api/types"
    11  	Cli "github.com/docker/docker/cli"
    12  	flag "github.com/docker/docker/pkg/mflag"
    13  	"github.com/docker/docker/pkg/signal"
    14  )
    15  
    16  // CmdAttach attaches to a running container.
    17  //
    18  // Usage: docker attach [OPTIONS] CONTAINER
    19  func (cli *DockerCli) CmdAttach(args ...string) error {
    20  	cmd := Cli.Subcmd("attach", []string{"CONTAINER"}, "Attach to a running container", true)
    21  	noStdin := cmd.Bool([]string{"#nostdin", "-no-stdin"}, false, "Do not attach STDIN")
    22  	proxy := cmd.Bool([]string{"#sig-proxy", "-sig-proxy"}, true, "Proxy all received signals to the process")
    23  
    24  	cmd.Require(flag.Exact, 1)
    25  
    26  	cmd.ParseFlags(args, true)
    27  
    28  	serverResp, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, nil)
    29  	if err != nil {
    30  		return err
    31  	}
    32  
    33  	defer serverResp.body.Close()
    34  
    35  	var c types.ContainerJSON
    36  	if err := json.NewDecoder(serverResp.body).Decode(&c); err != nil {
    37  		return err
    38  	}
    39  
    40  	if !c.State.Running {
    41  		return fmt.Errorf("You cannot attach to a stopped container, start it first")
    42  	}
    43  
    44  	if err := cli.CheckTtyInput(!*noStdin, c.Config.Tty); err != nil {
    45  		return err
    46  	}
    47  
    48  	if c.Config.Tty && cli.isTerminalOut {
    49  		if err := cli.monitorTtySize(cmd.Arg(0), false); err != nil {
    50  			logrus.Debugf("Error monitoring TTY size: %s", err)
    51  		}
    52  	}
    53  
    54  	var in io.ReadCloser
    55  
    56  	v := url.Values{}
    57  	v.Set("stream", "1")
    58  	if !*noStdin && c.Config.OpenStdin {
    59  		v.Set("stdin", "1")
    60  		in = cli.in
    61  	}
    62  
    63  	v.Set("stdout", "1")
    64  	v.Set("stderr", "1")
    65  
    66  	if *proxy && !c.Config.Tty {
    67  		sigc := cli.forwardAllSignals(cmd.Arg(0))
    68  		defer signal.StopCatch(sigc)
    69  	}
    70  
    71  	if err := cli.hijack("POST", "/containers/"+cmd.Arg(0)+"/attach?"+v.Encode(), c.Config.Tty, in, cli.out, cli.err, nil, nil); err != nil {
    72  		return err
    73  	}
    74  
    75  	_, status, err := getExitCode(cli, cmd.Arg(0))
    76  	if err != nil {
    77  		return err
    78  	}
    79  	if status != 0 {
    80  		return Cli.StatusError{StatusCode: status}
    81  	}
    82  
    83  	return nil
    84  }