# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2019-10-07 03:36:51
# Node ID 8f807a83d53b276e814db6a50704863e5b904e3b
# Parent  c17a63eb5d4c6d39567ea2aadd7687af9213526f

sidedata: use only changegroup3 if sidedata is in use

This is necessary to exchange the flags over the wire (and within bundles).

Differential Revision: https://phab.mercurial-scm.org/D6940

diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -1479,6 +1479,11 @@ def allsupportedversions(repo):
         #
         # (or even to push subset of history)
         needv03 = True
+    if b'exp-sidedata-flag' in repo.requirements:
+        needv03 = True
+        # don't attempt to use 01/02 until we do sidedata cleaning
+        versions.discard(b'01')
+        versions.discard(b'02')
     if not needv03:
         versions.discard(b'03')
     return versions