annotate mercurial/txnutil.py @ 43148:843da18386d5

sidedatacopies: deal with upgrading and downgrading to that format This is quite useful to test this on real life data. Differential Revision: https://phab.mercurial-scm.org/D6955
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sun, 06 Oct 2019 23:36:52 -0400
parents 687b865b95ad
children 89a2afe31e82
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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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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)