[MERGE] Btree repo again, better parent and thus diff

[John Arbash Meinel]

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     def __init__(self, upload_transport, index_transport, pack_transport,
- -        upload_suffix='', file_mode=None):
+        upload_suffix='', file_mode=None, index_builder_class=None,
+        index_class=None):
         """Create a NewPack instance.


^- Do we want to make these strictly required? For compatibility we
could say "if None: use_old_version".

...

@@ -1536,7 +1554,7 @@
         """
         self.lock_names()
         try:
- -            builder = GraphIndexBuilder()
+            builder = self._index_builder_class()
             # load the disk nodes across
             disk_nodes = set()
             for index, key, value in self._iter_disk_pack_index():
@@ -1608,7 +1626,9 @@

^- This is during "save_pack_names()" the old code directly used
GraphIndexBuilder, rather than InMemoryGraphIndex.

You no longer ever refer to GraphIndexBuilder in this file. Is there any
reason to use GIBuilder rather than IMGI?


Anyway, it looks good:
BB:approve

John
=:->


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