new file mode 100644

@@ -0,0 +1,62 @@

+package main

+

+import (

+	"fmt"

+	"github.com/dotcloud/docker/devmapper"

+	"os"

+)

+

+func usage() {

+	fmt.Printf("Usage: %s [snap new-id base-id] | [remove id] | [mount id mountpoint]\n", os.Args[0])

+	os.Exit(1)

+}

+

+func main() {

+	devices := devmapper.NewDeviceSetDM("/var/lib/docker")

+

+	if len(os.Args) < 2 {

+		usage()

+	}

+

+	cmd := os.Args[1]

+	if cmd == "snap" {

+		if len(os.Args) < 4 {

+			usage()

+		}

+

+		err := devices.AddDevice(os.Args[2], os.Args[3])

+		if err != nil {

+			fmt.Println("Can't create snap device: ", err)

+			os.Exit(1)

+		}

+	} else if cmd == "remove" {

+		if len(os.Args) < 3 {

+			usage()

+		}

+

+		err := devices.RemoveDevice(os.Args[2])

+		if err != nil {

+			fmt.Println("Can't remove device: ", err)

+			os.Exit(1)

+		}

+	} else if cmd == "mount" {

+		if len(os.Args) < 4 {

+			usage()

+		}

+

+		err := devices.MountDevice(os.Args[2], os.Args[3])

+		if err != nil {

+			fmt.Println("Can't create snap device: ", err)

+			os.Exit(1)

+		}

+	} else {

+		fmt.Printf("Unknown command %s\n", cmd)

+		if len(os.Args) < 4 {

+			usage()

+		}

+

+		os.Exit(1)

+	}

+

+	return

+}