Make devicemapper linux-only

graphdriver/devmapper/attachLoopback.go

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

graphdriver/devmapper/deviceset.go

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

graphdriver/devmapper/devmapper.go

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

graphdriver/devmapper/devmapper_log.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package devmapper
 
 import "C"

graphdriver/devmapper/devmapper_test.go

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

graphdriver/devmapper/devmapper_wrapper.go

@@ -1,3 +1,5 @@
+// +build linux
+
 package devmapper
 
 /*

graphdriver/devmapper/driver.go

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

graphdriver/devmapper/driver_test.go

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

graphdriver/devmapper/ioctl.go

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

graphdriver/devmapper/mount.go

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

graphdriver/devmapper/sys.go

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