D7621: pycompat: allow pycompat.sysbytes() even if input already is bytes

[martinvonz (Martin von Zweigbergk)]

martinvonz created this revision.
Herald added a subscriber: mercurial-devel.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  pycompat.sysstr() on py3 accepts an input that's already str
  (i.e. unicode). This patch makes it so pycompat.sysbytes() on py3
  accepts an input that's already bytes. Allowing that makes it possible
  to do pycompat.sysbytes(fp.name) where fp.name is either bytes or
  unicode, as we'll get when fp can come from either open() or
  resources.open_binary().

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D7621

AFFECTED FILES
  mercurial/pycompat.py

CHANGE DETAILS

diff --git a/mercurial/pycompat.py b/mercurial/pycompat.py
--- a/mercurial/pycompat.py
+++ b/mercurial/pycompat.py
@@ -253,6 +253,8 @@
         This never raises UnicodeEncodeError, but only ASCII characters
         can be round-trip by sysstr(sysbytes(s)).
         """
+        if isinstance(s, bytes):
+            return s
         return s.encode('utf-8')
 
     def sysstr(s):



To: martinvonz, #hg-reviewers
Cc: mercurial-devel