Adding version terminus

database.go

@@ -94,7 +94,7 @@ func (this *database) buildVersions(base string, names []string) ([]*version, er
 			return nil, err
 		}
 
-		ver, err := newVersion(path.Join(base, name), timestamp, this, parent)
+		ver, err := newVersion(path.Join(base, name), timestamp, this, parent, nil)
 		if err != nil {
 			return nil, err
 		}
@@ -103,6 +103,10 @@ func (this *database) buildVersions(base string, names []string) ([]*version, er
 		parent = ver
 	}
 
+	for _, ver := range vers {
+		ver.terminus = vers[len(vers)-1]
+	}
+
 	return vers, nil
 }
 

version.go

@@ -35,6 +35,7 @@ import (
 type version struct {
 	base      string
 	parent    *version
+	terminus  *version
 	timestamp time.Time
 	meta      *versionMetadata
 	root      *versionedDir
@@ -45,7 +46,7 @@ type InodeAllocator interface {
 	AllocInode() uint64
 }
 
-func newVersion(base string, timestamp time.Time, allocator InodeAllocator, parent *version) (*version, error) {
+func newVersion(base string, timestamp time.Time, allocator InodeAllocator, parent, terminus *version) (*version, error) {
 	meta, err := newVersionMetadata(filepath.Join(base, "meta.json"))
 	if err != nil {
 		return nil, err
@@ -54,6 +55,7 @@ func newVersion(base string, timestamp time.Time, allocator InodeAllocator, pare
 	ver := &version{
 		base:      base,
 		parent:    parent,
+		terminus:  terminus,
 		timestamp: timestamp,
 		meta:      meta,
 		inodeAloc: allocator}