resolve device name using libblkid

config/config.go

@@ -41,6 +41,7 @@ type Config struct {
 	SystemDockerArgs []string          `json:"systemDockerArgs,omitempty"`
 	UserContainers   []ContainerConfig `json:"userContainser,omitempty"`
 	UserInit         string            `json:"userInit,omitempty"`
+	DockerBin        string            `json:"dockerBin,omitempty"`
 	Modules          []string          `json:"modules,omitempty"`
 	Respawn          []string          `json:"respawn,omitempty"`
 }
@@ -70,16 +71,17 @@ func LoadConfig() (*Config, error) {
 func NewConfig() *Config {
 	return &Config{
 		ConsoleContainer: "console",
+		DockerBin:        "/usr/bin/docker",
 		Debug:            true,
 		DockerEndpoint:   "unix:/var/run/docker.sock",
 		Dns: []string{
 			"8.8.8.8",
 			"8.8.4.4",
 		},
-		ImagesPath:       "/",
-		ImagesPattern:    "images*.tar",
-		StateRequired:    false,
-		StateDev:         "/dev/sda",
+		ImagesPath:    "/",
+		ImagesPattern: "images*.tar",
+		StateRequired: false,
+		StateDev:         "LABEL=RANCHER_STATE",
 		StateDevFSType:   "ext4",
 		SysInit:          "/sbin/init-sys",
 		SystemDockerArgs: []string{"docker", "-d", "-s", "overlay", "-b", "none"},

init/init.go

@@ -217,13 +217,13 @@ func mountState(cfg *config.Config) error {
 		log.Debugf("State will not be persisted")
 		err = util.Mount("none", STATE, "tmpfs", "")
 	} else {
-		log.Debugf("Mounting state device %s to %s", cfg.StateDev, STATE)
+		log.Debugf("Mounting state device %s", cfg.StateDev)
 		err = util.Mount(cfg.StateDev, STATE, cfg.StateDevFSType, "")
 	}
 
-	//if err != nil {
-	return err
-	//}
+	if err != nil {
+		return err
+	}
 
 	//for _, i := range []string{"docker", "images"} {
 	//	dir := path.Join(STATE, i)

scripts/bootstrap

@@ -5,7 +5,7 @@ set -x
 cd $(dirname $0)/..
 
 apt-get update
-apt-get install -y curl rsync build-essential syslinux xorriso
+apt-get install -y curl rsync build-essential syslinux xorriso libblkid-dev
 
 
 curl -sL https://github.com/ibuildthecloud/docker/releases/download/v1.5.0-rancher-2/docker-1.5.0 > /usr/bin/docker

util/cutil.go

@@ -0,0 +1,16 @@
+package util
+
+/*
+#cgo LDFLAGS: -lblkid -luuid
+#include<blkid/blkid.h>
+#include<stdlib.h>
+*/
+import "C"
+import "unsafe"
+
+func ResolveDevice(spec string) string {
+	cString := C.blkid_evaluate_spec(C.CString(spec), nil)
+	defer C.free(unsafe.Pointer(cString)) 
+	return C.GoString(cString)
+}
+