Enable build on unsupported platforms

Should compile now without errors but changes needed to be added for each system so it actually works.
main_unsupported.go is a new file with all the unsupported commands
Fixes #9

Signed-off-by: Marianna <mtesselh@gmail.com>

checkpoint.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package main
 
 import (

events.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package main
 
 import (
@@ -56,7 +58,7 @@ var eventsCommand = cli.Command{
 			return
 		}
 		go func() {
-			for _ = range time.Tick(context.Duration("interval")) {
+			for range time.Tick(context.Duration("interval")) {
 				s, err := container.Stats()
 				if err != nil {
 					logrus.Error(err)

main.go

@@ -2,11 +2,9 @@ package main
 
 import (
 	"os"
-	"runtime"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/codegangsta/cli"
-	"github.com/opencontainers/runc/libcontainer"
 )
 
 const (
@@ -27,18 +25,6 @@ After creating a spec for your root filesystem with runc, you can execute a simp
 `
 )
 
-func init() {
-	if len(os.Args) > 1 && os.Args[1] == "init" {
-		runtime.GOMAXPROCS(1)
-		runtime.LockOSThread()
-		factory, _ := libcontainer.New("")
-		if err := factory.StartInitialization(); err != nil {
-			fatal(err)
-		}
-		panic("--this line should never been executed, congratulations--")
-	}
-}
-
 func main() {
 	app := cli.NewApp()
 	app.Name = "runc"
@@ -77,23 +63,8 @@ func main() {
 		}
 		return nil
 	}
-	// default action is to execute a container
-	app.Action = func(context *cli.Context) {
-		spec, err := loadSpec(context.Args().First())
-		if err != nil {
-			fatal(err)
-		}
-		if os.Geteuid() != 0 {
-			logrus.Fatal("runc should be run as root")
-		}
-		status, err := execContainer(context, spec)
-		if err != nil {
-			logrus.Fatalf("Container start failed: %v", err)
-		}
-		// exit with the container's exit status so any external supervisor is
-		// notified of the exit with the correct exit status.
-		os.Exit(status)
-	}
+
+	app.Action = runAction
 
 	if err := app.Run(os.Args); err != nil {
 		logrus.Fatal(err)

main_unsupported.go

@@ -0,0 +1,22 @@
+// +build !linux
+
+package main
+
+import (
+	"github.com/Sirupsen/logrus"
+	"github.com/codegangsta/cli"
+)
+
+func getDefaultID() string {
+	return ""
+}
+
+var (
+	checkpointCommand cli.Command
+	eventsCommand     cli.Command
+	restoreCommand    cli.Command
+)
+
+func runAction(*cli.Context) {
+	logrus.Fatal("Current OS is not supported yet")
+}

restore.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package main
 
 import (

run.go

@@ -1,14 +1,29 @@
+// +build linux
+
 package main
 
 import (
 	"fmt"
 	"os"
+	"runtime"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/codegangsta/cli"
 	"github.com/opencontainers/runc/libcontainer"
 )
 
+func init() {
+	if len(os.Args) > 1 && os.Args[1] == "init" {
+		runtime.GOMAXPROCS(1)
+		runtime.LockOSThread()
+		factory, _ := libcontainer.New("")
+		if err := factory.StartInitialization(); err != nil {
+			fatal(err)
+		}
+		panic("--this line should never been executed, congratulations--")
+	}
+}
+
 func execContainer(context *cli.Context, spec *Spec) (int, error) {
 	config, err := createLibcontainerConfig(spec)
 	if err != nil {
@@ -48,6 +63,24 @@ func execContainer(context *cli.Context, spec *Spec) (int, error) {
 	return handler.forward(process)
 }
 
+// default action is to execute a container
+func runAction(context *cli.Context) {
+	spec, err := loadSpec(context.Args().First())
+	if err != nil {
+		fatal(err)
+	}
+	if os.Geteuid() != 0 {
+		logrus.Fatal("runc should be run as root")
+	}
+	status, err := execContainer(context, spec)
+	if err != nil {
+		logrus.Fatalf("Container start failed: %v", err)
+	}
+	// exit with the container's exit status so any external supervisor is
+	// notified of the exit with the correct exit status.
+	os.Exit(status)
+}
+
 func destroy(container libcontainer.Container) {
 	status, err := container.Status()
 	if err != nil {

signals.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package main
 
 import (

spec.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"runtime"
 
+	"github.com/Sirupsen/logrus"
 	"github.com/codegangsta/cli"
 )
 
@@ -111,7 +112,7 @@ var specCommand = cli.Command{
 		}
 		data, err := json.MarshalIndent(&spec, "", "\t")
 		if err != nil {
-			fatal(err)
+			logrus.Fatal(err)
 		}
 		fmt.Printf("%s", data)
 	},

tty.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package main
 
 import (

utils.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package main
 
 import (