Removing 'exec' feature from the CLI until the docker daemon supports resizing of

tty sessions for exec'ed commands.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)

api/client/commands.go

@@ -2299,77 +2299,3 @@ func (cli *DockerCli) CmdLoad(args ...string) error {
 	}
 	return nil
 }
-
-func (cli *DockerCli) CmdExec(args ...string) error {
-	cmd := cli.Subcmd("exec", "[OPTIONS] CONTAINER COMMAND [ARG...]", "Run a command in an existing container")
-
-	execConfig, err := runconfig.ParseExec(cmd, args)
-	if err != nil {
-		return err
-	}
-	if execConfig.Container == "" {
-		cmd.Usage()
-		return nil
-	}
-
-	if execConfig.Detach {
-		_, _, err := cli.call("POST", "/containers/"+execConfig.Container+"/exec", execConfig, false)
-		return err
-	}
-	var (
-		out, stderr io.Writer
-		in          io.ReadCloser
-		// We need to instanciate the chan because the select needs it. It can
-		// be closed but can't be uninitialized.
-		hijacked = make(chan io.Closer)
-		errCh    chan error
-	)
-	// Block the return until the chan gets closed
-	defer func() {
-		log.Debugf("End of CmdExec(), Waiting for hijack to finish.")
-		if _, ok := <-hijacked; ok {
-			log.Errorf("Hijack did not finish (chan still open)")
-		}
-	}()
-
-	if execConfig.AttachStdin {
-		in = cli.in
-	}
-	if execConfig.AttachStdout {
-		out = cli.out
-	}
-	if execConfig.AttachStderr {
-		if execConfig.Tty {
-			stderr = cli.out
-		} else {
-			stderr = cli.err
-		}
-	}
-	errCh = utils.Go(func() error {
-		return cli.hijack("POST", "/containers/"+execConfig.Container+"/exec?", execConfig.Tty, in, out, stderr, hijacked, execConfig)
-	})
-
-	// Acknowledge the hijack before starting
-	select {
-	case closer := <-hijacked:
-		// Make sure that hijack gets closed when returning. (result
-		// in closing hijack chan and freeing server's goroutines.
-		if closer != nil {
-			defer closer.Close()
-		}
-	case err := <-errCh:
-		if err != nil {
-			log.Debugf("Error hijack: %s", err)
-			return err
-		}
-	}
-	// TODO(vishh): Enable tty size monitoring once the daemon can support that.
-	if errCh != nil {
-		if err := <-errCh; err != nil {
-			log.Debugf("Error hijack: %s", err)
-			return err
-		}
-	}
-
-	return nil
-}