Add pause/unpause commands

Author: tonistiigi

main.go

@@ -61,6 +61,8 @@ func main() {
 		restoreCommand,
 		killCommand,
 		specCommand,
+		pauseCommand,
+		unpauseCommand,
 	}
 	app.Before = func(context *cli.Context) error {
 		if context.GlobalBool("debug") {

pause.go

@@ -0,0 +1,33 @@
+// +build linux
+
+package main
+
+import "github.com/codegangsta/cli"
+
+var pauseCommand = cli.Command{
+	Name:  "pause",
+	Usage: "pause suspends all processes inside the container",
+	Action: func(context *cli.Context) {
+		container, err := getContainer(context)
+		if err != nil {
+			fatal(err)
+		}
+		if err := container.Pause(); err != nil {
+			fatal(err)
+		}
+	},
+}
+
+var unpauseCommand = cli.Command{
+	Name:  "unpause",
+	Usage: "unpause resumes all processes that have been previously paused",
+	Action: func(context *cli.Context) {
+		container, err := getContainer(context)
+		if err != nil {
+			fatal(err)
+		}
+		if err := container.Resume(); err != nil {
+			fatal(err)
+		}
+	},
+}