Only define a single process

This removes the Processes slice and only allows for one process of the
container.  It also renames TTY to Terminal for a cross platform
meaning.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

README.md

@@ -43,10 +43,11 @@ user named `daemon` defined within that file-system.
 ```json
 {
     "version": "0.1",
+    "platform": {
         "os": "linux",
-    "arch": "amd64",
-    "processes": [
-        {
+        "arch": "amd64"
+    },
+    "process": {
         "tty": true,
         "user": "daemon",
         "args": [
@@ -57,8 +58,7 @@ user named `daemon` defined within that file-system.
             "TERM=xterm"
         ],
         "cwd": ""
-        }
-    ],
+    },
     "root": {
         "path": "rootfs",
         "readonly": true

restore.go

@@ -82,7 +82,7 @@ func restoreContainer(context *cli.Context, spec *Spec, config *configs.Config,
 		Stdout: os.Stdout,
 		Stderr: os.Stderr,
 	}
-	tty, err := newTty(spec.Processes[0].TTY, process, rootuid)
+	tty, err := newTty(spec.Process.Terminal, process, rootuid)
 	if err != nil {
 		return -1, err
 	}

run.go

@@ -10,9 +10,6 @@ import (
 )
 
 func execContainer(context *cli.Context, spec *Spec) (int, error) {
-	if len(spec.Processes) != 1 {
-		return -1, fmt.Errorf("runc only supports one(1) process for the container")
-	}
 	config, err := createLibcontainerConfig(spec)
 	if err != nil {
 		return -1, err
@@ -38,8 +35,8 @@ func execContainer(context *cli.Context, spec *Spec) (int, error) {
 	// ensure that the container is always removed if we were the process
 	// that created it.
 	defer destroy(container)
-	process := newProcess(spec.Processes[0])
-	tty, err := newTty(spec.Processes[0].TTY, process, rootuid)
+	process := newProcess(spec.Process)
+	tty, err := newTty(spec.Process.Terminal, process, rootuid)
 	if err != nil {
 		return -1, err
 	}

spec.go

@@ -18,7 +18,7 @@ type Mount struct {
 }
 
 type Process struct {
-	TTY  bool     `json:"tty"`
+	Terminal bool     `json:"tty"`
 	User     string   `json:"user"`
 	Args     []string `json:"args"`
 	Env      []string `json:"env"`
@@ -43,7 +43,7 @@ type Platform struct {
 type PortableSpec struct {
 	Version  string   `json:"version"`
 	Platform Platform `json:"platform"`
-	Processes []*Process `json:"processes"`
+	Process  Process  `json:"process"`
 	Root     Root     `json:"root"`
 	Hostname string   `json:"hostname"`
 	Mounts   []Mount  `json:"mounts"`
@@ -63,9 +63,8 @@ var specCommand = cli.Command{
 				Path:     "rootfs",
 				Readonly: true,
 			},
-			Processes: []*Process{
-				{
-					TTY:  true,
+			Process: Process{
+				Terminal: true,
 				User:     "daemon",
 				Args: []string{
 					"sh",
@@ -75,7 +74,6 @@ var specCommand = cli.Command{
 					"TERM=xterm",
 				},
 			},
-			},
 			Hostname: "shell",
 			Mounts: []Mount{
 				{

utils.go

@@ -160,7 +160,7 @@ func getDefaultImagePath(context *cli.Context) string {
 
 // newProcess returns a new libcontainer Process with the arguments from the
 // spec and stdio from the current process.
-func newProcess(p *Process) *libcontainer.Process {
+func newProcess(p Process) *libcontainer.Process {
 	return &libcontainer.Process{
 		Args:   p.Args,
 		Env:    p.Env,