annotate mercurial/txnutil.py @ 47902:4cade5e944c2

dirstatemap: use the default code to handle "removed" case This one is very easy. Differential Revision: https://phab.mercurial-scm.org/D11327
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 16 Jul 2021 17:23:40 +0200
parents 89a2afe31e82
children 6000f5b25c9b
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1 # txnutil.py - transaction related utilities
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2 #
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3 # Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import errno
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11
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12 from . import encoding
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13
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14
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15 def mayhavepending(root):
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16 """return whether 'root' may have pending changes, which are
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17 visible to this process.
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18 """
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19 return root == encoding.environ.get(b'HG_PENDING')
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20
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21
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22 def trypending(root, vfs, filename, **kwargs):
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23 """Open file to be read according to HG_PENDING environment variable
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24
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25 This opens '.pending' of specified 'filename' only when HG_PENDING
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26 is equal to 'root'.
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27
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28 This returns '(fp, is_pending_opened)' tuple.
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29 """
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30 if mayhavepending(root):
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31 try:
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32 return (vfs(b'%s.pending' % filename, **kwargs), True)
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33 except IOError as inst:
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34 if inst.errno != errno.ENOENT:
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35 raise
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36 return (vfs(filename, **kwargs), False)