# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1493927162 -7200
# Node ID 38d2f9e5df40c579130671457a3d66d76f70cdc7
# Parent  3f638e626f2219ec0dab3ffd0dcafaafba161927
bundle: check changegroup version earlier

We can check if we know how to bundle this changegroup version before actually
starting to generate the changegroup.

diff -r 3f638e626f22 -r 38d2f9e5df40 mercurial/commands.py
--- a/mercurial/commands.py	Thu May 04 21:44:36 2017 +0200
+++ b/mercurial/commands.py	Thu May 04 21:46:02 2017 +0200
@@ -1373,8 +1373,6 @@
         scmutil.nochangesfound(ui, repo, not base and outgoing.excluded)
         return 1
 
-    cg = changegroup.getchangegroup(repo, 'bundle', outgoing, version=cgversion)
-
     if cgversion == '01': #bundle1
         if bcompression is None:
             bcompression = 'UN'
@@ -1386,6 +1384,8 @@
         raise error.ProgrammingError(
             'bundle: unexpected changegroup version %s' % cgversion)
 
+    cg = changegroup.getchangegroup(repo, 'bundle', outgoing, version=cgversion)
+
     # TODO compression options should be derived from bundlespec parsing.
     # This is a temporary hack to allow adjusting bundle compression
     # level without a) formalizing the bundlespec changes to declare it