Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/txnutil.py @ 40450:41f0529b5112 stable

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commandserver: get around ETIMEDOUT raised by selectors2 selector.select() should exits with an empty event list on timed out, but selectors2 raises OSError if timeout expires while recovering from EINTR. Spotted while debugging new chg feature.
author Yuya Nishihara <yuya@tcha.org>
date Mon, 03 Dec 2018 21:45:15 +0900
parents 206532700213
children 2372284d9457
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
31070
206532700213 txnutil: factor out the logic to read file in according to HG_PENDING
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
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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 (
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13 encoding,
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14 )
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15
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16 def mayhavepending(root):
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17 '''return whether 'root' may have pending changes, which are
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18 visible to this process.
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19 '''
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20 return root == encoding.environ.get('HG_PENDING')
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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('%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)