ability to, at least temporarily, set the storage driver

README.md

@@ -23,10 +23,11 @@ docker run -i --privileged -v $(pwd):/drone/src plugins/drone-docker <<EOF
 		"branch": "master"
 	},
 	"vargs": {
-		"username": "foo",
-		"password": "bar", 
+		"username": "kevinbacon",
+		"password": "pa$$word", 
 		"email": "foo@bar.com", 
-		"repo": "foo/bar"
+		"repo": "foo/bar",
+		"storage_driver": "brtfs"
 	}
 }
 EOF

main.go

@@ -12,6 +12,7 @@ import (
 )
 
 type Docker struct {
+	Storage  string `json:"storage_driver"`
 	Registry string `json:"registry"`
 	Username string `json:"username"`
 	Password string `json:"password"`
@@ -32,6 +33,11 @@ func main() {
 		os.Exit(1)
 	}
 
+	// Set the storage driver
+	if len(vargs.Storage) == 0 {
+		vargs.Storage = "devicemapper"
+	}
+
 	stop := func() {
 		cmd := exec.Command("start-stop-daemon", "--stop", "--pidfile", "/var/run/docker.pid")
 		cmd.Stdout = os.Stdout
@@ -48,7 +54,7 @@ func main() {
 		cmd.Stderr = ioutil.Discard
 		cmd.Run()
 
-		cmd = exec.Command("docker", "-d", "-s", "overlay")
+		cmd = exec.Command("docker", "-d", "-s", vargs.Storage)
 		cmd.Stdout = ioutil.Discard
 		cmd.Stderr = ioutil.Discard
 		trace(cmd)