mercurial/mergeutil.py

patch: handle filenames with trailing spaces

I have no idea if this is *actually* supported by the patch file format, but at
least when reading from a patch file created by running `hg shelve`, it is
written out such that there's a trailing space after the second (`b`) filename.
When we read the patch file, we remove the space before parsing the filenames,
so it doesn't end up matching the other sources of what files are in the shelve.

We observed this internally due to a wrapper around unshelve that called into
patch.changedfiles, but `hg patch` is able to reproduce the issue as well, so
I've included both tests.

Differential Revision: https://phab.mercurial-scm.org/D9729

# mergeutil.py - help for merge processing in mercurial
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from .i18n import _

from . import error


def checkunresolved(ms):
    if list(ms.unresolved()):
        raise error.StateError(
            _(b"unresolved merge conflicts (see 'hg help resolve')")
        )