# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Date 1493742678 -7200
# Node ID 97668112341642d79c336a9fb9e733baadafbea7
# Parent  d0d9a4fca59bcb0c0d5a53e7b3d2db2068844d1f
transaction: introduce "changes" dictionary to precisely track updates

The transaction is already tracking some data intended for hooks (in
'hookargs'). However, that information is minimal as we optimise for
passing data to other processes through environment variables. There are
multiple places were we could use more complete and lower level
information locally (eg: cache update, better report of changes to
hooks, etc...).

For this purpose we introduces a 'changes' dictionary on the
transaction.  It is intended to track every changes happening to the
repository (eg: new revs, bookmarks move, phases move, obs-markers,
etc).

For now we just adds the 'changes' dictionary. We'll adds more tracking
and usages over time.

diff -r d0d9a4fca59b -r 976681123416 mercurial/transaction.py
--- a/mercurial/transaction.py	Thu May 11 10:50:05 2017 -0700
+++ b/mercurial/transaction.py	Tue May 02 18:31:18 2017 +0200
@@ -137,6 +137,10 @@
             releasefn = lambda tr, success: None
         self.releasefn = releasefn
 
+        # A dict dedicated to precisely tracking the changes introduced in the
+        # transaction.
+        self.changes = {}
+
         # a dict of arguments to be passed to hooks
         self.hookargs = {}
         self.file = opener.open(self.journal, "w")