Patch for docker v0.7.0-rc4 to allow use on a 32-bit device, also fix missing arg to MountDevices().

devmapper.diff

diff --git a/devmapper/devmapper.go b/devmapper/devmapper.go
index eae4224..36fd985 100644
--- a/devmapper/devmapper.go
+++ b/devmapper/devmapper.go
@@ -1,6 +1,7 @@
 package devmapper
 
 /*
+#cgo CFLAGS: -D_FILE_OFFSET_BITS=64
 #cgo LDFLAGS: -L. -ldevmapper
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/devmapper/docker-device-tool/device_tool.go b/devmapper/docker-device-tool/device_tool.go
index f66762d..6b8b47c 100644
--- a/devmapper/docker-device-tool/device_tool.go
+++ b/devmapper/docker-device-tool/device_tool.go
@@ -44,7 +44,7 @@ func main() {
 			usage()
 		}
 
-		err := devices.MountDevice(os.Args[2], os.Args[3])
+		err := devices.MountDevice(os.Args[2], os.Args[3], false)
 		if err != nil {
 			fmt.Println("Can't create snap device: ", err)
 			os.Exit(1)
diff --git a/server.go b/server.go
index e1ec19a..fa07ca7 100644
--- a/server.go
+++ b/server.go
@@ -1402,8 +1402,8 @@ func (srv *Server) ContainerCopy(name string, resource string, out io.Writer) er
 }
 
 func NewServer(config *DaemonConfig) (*Server, error) {
-	if runtime.GOARCH != "amd64" {
-		log.Fatalf("The docker runtime currently only supports amd64 (not %s). This will change in the future. Aborting.", runtime.GOARCH)
+	if runtime.GOARCH != "amd64" && runtime.GOARCH != "386" && runtime.GOARCH != "arm" {
+		log.Fatalf("The docker runtime currently only supports amd64, 386 and arm (not %s). This will change in the future. Aborting.", runtime.GOARCH)
 	}
 	runtime, err := NewRuntime(config)
 	if err != nil {