Defined struct and first function for enhanced snapshot handling

builder/virtualbox/common/driver_4_2.go

@@ -241,6 +241,11 @@ func (d *VBox42Driver) Version() (string, error) {
 	return matches[0][1], nil
 }
 
+// LoadSnapshots load the snapshots for a VM instance
+func (d *VBox42Driver) LoadSnapshots(vmName string) (*VBoxSnapshot, error) {
+	return nil, nil
+}
+
 func (d *VBox42Driver) CreateSnapshot(vmname string, snapshotName string) error {
 	log.Printf("Executing CreateSnapshot: VM: %s, SnapshotName %s", vmname, snapshotName)
 

builder/virtualbox/common/snapshot.go

@@ -0,0 +1,15 @@
+package common
+
+// VBoxSnapshot stores the hierarchy of snapshots for a VM instance
+type VBoxSnapshot struct {
+	Name      string
+	UUID      string
+	IsCurrent bool
+	Parent    *VBoxSnapshot // nil if topmost (root) snapshot
+	Children  []VBoxSnapshot
+}
+
+// IsChildOf verifies if the current snaphot is a child of the passed as argument
+func (sn *VBoxSnapshot) IsChildOf(candidate *VBoxSnapshot) bool {
+	return false
+}

builder/virtualbox/common/snapshot_test.go

@@ -0,0 +1 @@
+package common