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mercurial/changegroup.py
changeset 40497 968dd7e02ac5
parent 40496 6a917075535a
child 40498 808b762679cd 
--- a/mercurial/changegroup.py	Tue Oct 09 23:26:35 2018 +0200
+++ b/mercurial/changegroup.py	Wed Oct 10 00:21:02 2018 +0200
@@ -697,9 +697,16 @@
         progress = repo.ui.makeprogress(topic, unit=_('chunks'),
                                         total=len(nodes))
 
+    configtarget = repo.ui.config('devel', 'bundle.delta')
+    if configtarget not in ('', 'p1'):
+        msg = _("""config "devel.bundle.delta" as unknown value: %s""")
+        repo.ui.warn(msg % configtarget)
+
     deltamode = repository.CG_DELTAMODE_STD
     if forcedeltaparentprev:
         deltamode = repository.CG_DELTAMODE_PREV
+    elif configtarget == 'p1':
+        deltamode = repository.CG_DELTAMODE_P1
 
     revisions = store.emitrevisions(
         nodes,
hg-stable