ros dev spec

find device using blkid spec

cmd/control/dev.go

@@ -0,0 +1,11 @@
+package control
+
+import (
+	"fmt"
+	"github.com/codegangsta/cli"
+	"github.com/rancherio/os/util"
+)
+
+func devAction(c *cli.Context) {
+	fmt.Println(util.ResolveDevice(c.Args()[0]))
+}