Add pod buckets

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #184
Approved by: baude

libpod/boltdb_state.go

@@ -69,6 +69,14 @@ func NewBoltState(path, lockDir string, runtime *Runtime) (State, error) {
 		if err != nil {
 			return errors.Wrapf(err, "error creating container-depends bucket")
 		}
+		_, err = tx.CreateBucketIfNotExists(podBkt)
+		if err != nil {
+			return errors.Wrapf(err, "error creating pod bucket")
+		}
+		_, err = tx.CreateBucketIfNotExists(podContainersBkt)
+		if err != nil {
+			return errors.Wrapf(err, "error creating pod-containers bucket")
+		}
 		return nil
 	})
 	if err != nil {

libpod/boltdb_state_internal.go

@@ -17,6 +17,8 @@ const (
 	netNSName         = "net-ns"
 	runtimeConfigName = "runtime-config"
 	ctrDependsName    = "container-depends"
+	podName           = "pod"
+	podContainersName = "pod-containers"
 )
 
 var (
@@ -27,6 +29,8 @@ var (
 	netNSBkt         = []byte(netNSName)
 	runtimeConfigBkt = []byte(runtimeConfigName)
 	ctrDependsBkt    = []byte(ctrDependsName)
+	podBkt           = []byte(podName)
+	podContainersBkt = []byte(podContainersName)
 )
 
 // Check if the configuration of the database is compatible with the
@@ -158,6 +162,22 @@ func getCtrDependsBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
 	return bkt, nil
 }
 
+func getPodBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
+	bkt := tx.Bucket(podBkt)
+	if bkt == nil {
+		return nil, errors.Wrapf(ErrDBBadConfig, "pods bucket not found in DB")
+	}
+	return bkt, nil
+}
+
+func getPodContainersBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
+	bkt := tx.Bucket(podContainersBkt)
+	if bkt == nil {
+		return nil, errors.Wrapf(ErrDBBadConfig, "pod containers bucket not found in DB")
+	}
+	return bkt, nil
+}
+
 func (s *BoltState) getContainerFromDB(id []byte, ctr *Container, config, state, netNS *bolt.Bucket) error {
 	configBytes := config.Get(id)
 	if configBytes == nil {