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@@ -1,5 +1,10 @@
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 module StrokeDB
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-  RAW_HEAD_VERSION_UUID         = Util.sha1_uuid("strokedb-internal:head-version").to_raw_uuid
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+  
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+  def self.head(branch="master")
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+    Util.sha1_uuid(branch).to_raw_uuid
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+  end
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+  
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+  RAW_MASTER_HEAD_VERSION_UUID         = head()
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   class FileStorage < Storage
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@@ -14,7 +19,7 @@ module StrokeDB
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     def find(uuid, version=nil, opts = {}, &block)
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       uuid_version = uuid + (version ? ".#{version}" : "")
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-      key = uuid.to_raw_uuid + (version ? version.to_raw_uuid : RAW_HEAD_VERSION_UUID)
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+      key = uuid.to_raw_uuid + (version ? version.to_raw_uuid : RAW_MASTER_HEAD_VERSION_UUID)
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       if (ptr = @uindex.find(key)) && (ptr[0,20] != "\x00" * 20) # no way ptr will be zero
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         raw_doc = StrokeDB::deserialize(read_at_ptr(ptr[0,20]))
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         unless opts[:no_instantiation]
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@@ -28,7 +33,7 @@ module StrokeDB
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     end
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     def include?(uuid,version=nil)
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-      key = uuid.to_raw_uuid + (version ? version.to_raw_uuid : RAW_HEAD_VERSION_UUID)
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+      key = uuid.to_raw_uuid + (version ? version.to_raw_uuid : RAW_MASTER_HEAD_VERSION_UUID)
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       !@uindex.find(key).nil?
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     end
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@@ -47,7 +52,7 @@ module StrokeDB
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       @uindex.each do |key, value|
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         timestamp = StrokeDB.deserialize(read_at_ptr(value[20,20]))
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         next if after && (timestamp <= after)
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-        if key[16,16] == RAW_HEAD_VERSION_UUID || include_versions
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+        if key[16,16] == RAW_MASTER_HEAD_VERSION_UUID || include_versions
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           yield Document.from_raw(options[:store],StrokeDB.deserialize(read_at_ptr(value[0,20])))
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         end
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       end
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@@ -59,7 +64,7 @@ module StrokeDB
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       ts_ptr = DistributedPointer.pack(@archive.raw_uuid,ts_position)
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       ptr = DistributedPointer.pack(@archive.raw_uuid,position)
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       uuid = document.raw_uuid
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-      @uindex.insert(uuid + RAW_HEAD_VERSION_UUID, ptr + ts_ptr) if options[:head] || !document.is_a?(VersionedDocument)
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+      @uindex.insert(uuid + RAW_MASTER_HEAD_VERSION_UUID, ptr + ts_ptr) if options[:head] || !document.is_a?(VersionedDocument)
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       @uindex.insert(uuid + document.version.to_raw_uuid, ptr + ts_ptr) unless options[:head]
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     rescue ArchiveVolume::VolumeCapacityExceeded   
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       create_new_archive!