# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2016-11-11 07:29:01
# Node ID 71b368e3b590b5fb130eb549123afba64e829439
# Parent  90933e4e44fdbd727ed65480e67822141ae53f0e

bundle2: equate 'UN' with no compression

An upcoming patch will change the "alg" argument passed to this
function from None to "UN" when no compression is wanted.

The existing implementation of bundle2 does not set a "Compression"
parameter if no compression is used. In theory, setting
"Compression=UN" should work. But I haven't audited the code to see if
all client versions supporting bundle2 will accept this.

Rather than take the risk, avoid the BC breakage and treat "UN"
the same as None.

diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -515,7 +515,7 @@ class bundle20(object):
 
     def setcompression(self, alg):
         """setup core part compression to <alg>"""
-        if alg is None:
+        if alg in (None, 'UN'):
             return
         assert not any(n.lower() == 'Compression' for n, v in self._params)
         self.addparam('Compression', alg)