annotate mercurial/txnutil.py @ 42618:c17e6a3e7356

phabricator: handle local:commits time being string or int

When setting local:commits arcanist has different behaviour depending on
whether the repo is git or hg. With hg it sets the time as a number, since it
calls PHP's strtotime on the value, but with git it sets it as a string.
Normally this wouldn't be an issue since phabread wouldn't be interacting with
Phabricator Revisions for git repos, but Mozilla has a secondary workflow for
git users that uses the git-cinnabar tool to interact with their hg repos. When
a git-cinnabar user uses the moz-phab tool to submit patches for mozilla-central
it makes use of Mozilla's fork of arcanist, which works with their local git
version of m-c, and thus sets the local:commit time as a string, and then
translates the commit hashes.

Currently when encountering such DREVS phabread dies with "TypeError: %d format:
a number is required, not str".

phabsend also used to set it as a string but wouldn't have encountered the
issue with its own DREVs since it would read hg:meta first.

Differential Revision: https://phab.mercurial-scm.org/D6650

# txnutil.py - transaction related utilities
#
#  Copyright FUJIWARA Katsunori <[e-mail]> 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)