# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2018-02-12 02:50:24
# Node ID 6ea7f1c10c8160da6e31e30c9a024feab4980e15
# Parent  9e47bfbeb7230317f9710768769779cbaadbb60c

py3: cast character set to bytes

The returned value from this function is eventually fed into
email.charset.Charset.__init__. However, the standard library
appears to handle both string types in Python 2 and 3. So there
shouldn't be any problem returning a bytes here.

Differential Revision: https://phab.mercurial-scm.org/D2167

diff --git a/mercurial/mail.py b/mercurial/mail.py
--- a/mercurial/mail.py
+++ b/mercurial/mail.py
@@ -187,7 +187,7 @@ def validateconfig(ui):
 
 def codec2iana(cs):
     ''''''
-    cs = email.charset.Charset(cs).input_charset.lower()
+    cs = pycompat.sysbytes(email.charset.Charset(cs).input_charset.lower())
 
     # "latin1" normalizes to "iso8859-1", standard calls for "iso-8859-1"
     if cs.startswith("iso") and not cs.startswith("iso-"):