remove execCreate & execStart from job

Also removed the function ExecConfigFromJob

Signed-off-by: Sun Jianbo <wonderflow@zju.edu.cn>
Signed-off-by: Alexander Morozov <lk4d4@docker.com>

api/client/exec.go

@@ -32,9 +32,6 @@ func (cli *DockerCli) CmdExec(args ...string) error {
 	if err := json.NewDecoder(stream).Decode(&response); err != nil {
 		return err
 	}
-	for _, warning := range response.Warnings {
-		fmt.Fprintf(cli.err, "WARNING: %s\n", warning)
-	}
 
 	execID := response.ID
 
@@ -43,12 +40,18 @@ func (cli *DockerCli) CmdExec(args ...string) error {
 		return nil
 	}
 
+	//Temp struct for execStart so that we don't need to transfer all the execConfig
+	execStartCheck := &types.ExecStartCheck{
+		Detach: execConfig.Detach,
+		Tty:    execConfig.Tty,
+	}
+
 	if !execConfig.Detach {
 		if err := cli.CheckTtyInput(execConfig.AttachStdin, execConfig.Tty); err != nil {
 			return err
 		}
 	} else {
-		if _, _, err := readBody(cli.call("POST", "/exec/"+execID+"/start", execConfig, nil)); err != nil {
+		if _, _, err := readBody(cli.call("POST", "/exec/"+execID+"/start", execStartCheck, nil)); err != nil {
 			return err
 		}
 		// For now don't print this - wait for when we support exec wait()

api/server/server.go

@@ -1,8 +1,6 @@
 package server
 
 import (
-	"bufio"
-	"bytes"
 	"runtime"
 	"time"
 
@@ -1393,35 +1391,27 @@ func (s *Server) postContainerExecCreate(eng *engine.Engine, version version.Ver
 	if err := parseForm(r); err != nil {
 		return nil
 	}
-	var (
-		name         = vars["name"]
-		job          = eng.Job("execCreate", name)
-		stdoutBuffer = bytes.NewBuffer(nil)
-		outWarnings  []string
-		warnings     = bytes.NewBuffer(nil)
-	)
+	name := vars["name"]
 
-	if err := job.DecodeEnv(r.Body); err != nil {
+	execConfig := &runconfig.ExecConfig{}
+	if err := json.NewDecoder(r.Body).Decode(execConfig); err != nil {
 		return err
 	}
+	execConfig.Container = name
+
+	if len(execConfig.Cmd) == 0 {
+		return fmt.Errorf("No exec command specified")
+	}
 
-	job.Stdout.Add(stdoutBuffer)
-	// Read warnings from stderr
-	job.Stderr.Add(warnings)
 	// Register an instance of Exec in container.
-	if err := job.Run(); err != nil {
-		fmt.Fprintf(os.Stderr, "Error setting up exec command in container %s: %s\n", name, err)
+	id, err := s.daemon.ContainerExecCreate(execConfig)
+	if err != nil {
+		logrus.Errorf("Error setting up exec command in container %s: %s", name, err)
 		return err
 	}
-	// Parse warnings from stderr
-	scanner := bufio.NewScanner(warnings)
-	for scanner.Scan() {
-		outWarnings = append(outWarnings, scanner.Text())
-	}
 
 	return writeJSON(w, http.StatusCreated, &types.ContainerExecCreateResponse{
-		ID:       engine.Tail(stdoutBuffer, 1),
-		Warnings: outWarnings,
+		ID: id,
 	})
 }
 
@@ -1431,15 +1421,18 @@ func (s *Server) postContainerExecStart(eng *engine.Engine, version version.Vers
 		return nil
 	}
 	var (
-		name             = vars["name"]
-		job              = eng.Job("execStart", name)
-		errOut io.Writer = os.Stderr
+		execName = vars["name"]
+		stdin    io.ReadCloser
+		stdout   io.Writer
+		stderr   io.Writer
 	)
 
-	if err := job.DecodeEnv(r.Body); err != nil {
+	execStartCheck := &types.ExecStartCheck{}
+	if err := json.NewDecoder(r.Body).Decode(execStartCheck); err != nil {
 		return err
 	}
-	if !job.GetenvBool("Detach") {
+
+	if !execStartCheck.Detach {
 		// Setting up the streaming http interface.
 		inStream, outStream, err := hijackServer(w)
 		if err != nil {
@@ -1455,21 +1448,20 @@ func (s *Server) postContainerExecStart(eng *engine.Engine, version version.Vers
 			fmt.Fprintf(outStream, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n")
 		}
 
-		if !job.GetenvBool("Tty") && version.GreaterThanOrEqualTo("1.6") {
+		if !execStartCheck.Tty && version.GreaterThanOrEqualTo("1.6") {
 			errStream = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)
 			outStream = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)
 		} else {
 			errStream = outStream
 		}
-		job.Stdin.Add(inStream)
-		job.Stdout.Add(outStream)
-		job.Stderr.Set(errStream)
-		errOut = outStream
+		stdin = inStream
+		stdout = outStream
+		stderr = errStream
 	}
 	// Now run the user process in container.
-	job.SetCloseIO(false)
-	if err := job.Run(); err != nil {
-		fmt.Fprintf(errOut, "Error starting exec command in container %s: %s\n", name, err)
+
+	if err := s.daemon.ContainerExecStart(execName, stdin, stdout, stderr); err != nil {
+		logrus.Errorf("Error starting exec command in container %s: %s", execName, err)
 		return err
 	}
 	w.WriteHeader(http.StatusNoContent)

api/types/types.go

@@ -16,9 +16,6 @@ type ContainerCreateResponse struct {
 type ContainerExecCreateResponse struct {
 	// ID is the exec ID.
 	ID string `json:"Id"`
-
-	// Warnings are any warnings encountered during the execution of the command.
-	Warnings []string `json:"Warnings"`
 }
 
 // POST /auth
@@ -156,3 +153,12 @@ type Info struct {
 	Name               string
 	Labels             []string
 }
+
+// This struct is a temp struct used by execStart
+// Config fields is part of ExecConfig in runconfig package
+type ExecStartCheck struct {
+	// ExecStart will first check if it's detached
+	Detach bool
+	// Check if there's a tty
+	Tty bool
+}

daemon/daemon.go

@@ -118,8 +118,6 @@ type Daemon struct {
 func (daemon *Daemon) Install(eng *engine.Engine) error {
 	for name, method := range map[string]engine.Handler{
 		"container_inspect": daemon.ContainerInspect,
-		"execCreate":        daemon.ContainerExecCreate,
-		"execStart":         daemon.ContainerExecStart,
 	} {
 		if err := eng.Register(name, method); err != nil {
 			return err

daemon/exec.go

@@ -10,7 +10,6 @@ import (
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/docker/daemon/execdriver"
 	"github.com/docker/docker/daemon/execdriver/lxc"
-	"github.com/docker/docker/engine"
 	"github.com/docker/docker/pkg/broadcastwriter"
 	"github.com/docker/docker/pkg/ioutils"
 	"github.com/docker/docker/pkg/promise"
@@ -111,25 +110,15 @@ func (d *Daemon) getActiveContainer(name string) (*Container, error) {
 	return container, nil
 }
 
-func (d *Daemon) ContainerExecCreate(job *engine.Job) error {
-	if len(job.Args) != 1 {
-		return fmt.Errorf("Usage: %s [options] container command [args]", job.Name)
-	}
+func (d *Daemon) ContainerExecCreate(config *runconfig.ExecConfig) (string, error) {
 
 	if strings.HasPrefix(d.execDriver.Name(), lxc.DriverName) {
-		return lxc.ErrExec
+		return "", lxc.ErrExec
 	}
 
-	var name = job.Args[0]
-
-	container, err := d.getActiveContainer(name)
+	container, err := d.getActiveContainer(config.Container)
 	if err != nil {
-		return err
-	}
-
-	config, err := runconfig.ExecConfigFromJob(job)
-	if err != nil {
-		return err
+		return "", err
 	}
 
 	cmd := runconfig.NewCommand(config.Cmd...)
@@ -158,20 +147,15 @@ func (d *Daemon) ContainerExecCreate(job *engine.Job) error {
 
 	d.registerExecCommand(execConfig)
 
-	job.Printf("%s\n", execConfig.ID)
+	return execConfig.ID, nil
 
-	return nil
 }
 
-func (d *Daemon) ContainerExecStart(job *engine.Job) error {
-	if len(job.Args) != 1 {
-		return fmt.Errorf("Usage: %s [options] exec", job.Name)
-	}
+func (d *Daemon) ContainerExecStart(execName string, stdin io.ReadCloser, stdout io.Writer, stderr io.Writer) error {
 
 	var (
 		cStdin           io.ReadCloser
 		cStdout, cStderr io.Writer
-		execName         = job.Args[0]
 	)
 
 	execConfig, err := d.getExecConfig(execName)
@@ -201,15 +185,15 @@ func (d *Daemon) ContainerExecStart(job *engine.Job) error {
 		go func() {
 			defer w.Close()
 			defer logrus.Debugf("Closing buffered stdin pipe")
-			io.Copy(w, job.Stdin)
+			io.Copy(w, stdin)
 		}()
 		cStdin = r
 	}
 	if execConfig.OpenStdout {
-		cStdout = job.Stdout
+		cStdout = stdout
 	}
 	if execConfig.OpenStderr {
-		cStderr = job.Stderr
+		cStderr = stderr
 	}
 
 	execConfig.StreamConfig.stderr = broadcastwriter.New()

runconfig/exec.go

@@ -1,9 +1,6 @@
 package runconfig
 
 import (
-	"fmt"
-
-	"github.com/docker/docker/engine"
 	flag "github.com/docker/docker/pkg/mflag"
 )
 
@@ -19,25 +16,6 @@ type ExecConfig struct {
 	Cmd          []string
 }
 
-func ExecConfigFromJob(job *engine.Job) (*ExecConfig, error) {
-	execConfig := &ExecConfig{
-		User:         job.Getenv("User"),
-		Privileged:   job.GetenvBool("Privileged"),
-		Tty:          job.GetenvBool("Tty"),
-		AttachStdin:  job.GetenvBool("AttachStdin"),
-		AttachStderr: job.GetenvBool("AttachStderr"),
-		AttachStdout: job.GetenvBool("AttachStdout"),
-	}
-	cmd := job.GetenvList("Cmd")
-	if len(cmd) == 0 {
-		return nil, fmt.Errorf("No exec command specified")
-	}
-
-	execConfig.Cmd = cmd
-
-	return execConfig, nil
-}
-
 func ParseExec(cmd *flag.FlagSet, args []string) (*ExecConfig, error) {
 	var (
 		flStdin      = cmd.Bool([]string{"i", "-interactive"}, false, "Keep STDIN open even if not attached")