view mercurial/txnutil.py @ 38476:b4cfd803b3f2

tests: fix up some lax escaping in test-template-basic.t These misfired escapes turn into hard errors in Python 3.7, and I'd really rather we not work around it. We should *probably* try and find a way to proactively warn users about invalid escape sequences. There's one more failure of this type in this file on Python 3.7, but I can't figure out the issue. It'll need to be corrected in a follow-up. Differential Revision: https://phab.mercurial-scm.org/D3843
author Augie Fackler <augie@google.com>
date Tue, 26 Jun 2018 11:38:58 -0400
parents 206532700213
children 2372284d9457
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# txnutil.py - transaction related utilities
#
#  Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
#
# 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

import errno

from . import (
    encoding,
)

def mayhavepending(root):
    '''return whether 'root' may have pending changes, which are
    visible to this process.
    '''
    return root == encoding.environ.get('HG_PENDING')

def trypending(root, vfs, filename, **kwargs):
    '''Open  file to be read according to HG_PENDING environment variable

    This opens '.pending' of specified 'filename' only when HG_PENDING
    is equal to 'root'.

    This returns '(fp, is_pending_opened)' tuple.
    '''
    if mayhavepending(root):
        try:
            return (vfs('%s.pending' % filename, **kwargs), True)
        except IOError as inst:
            if inst.errno != errno.ENOENT:
                raise
    return (vfs(filename, **kwargs), False)