annotate mercurial/txnutil.py @ 50896:b2b8c25f9462

hgwebmod: use sysstr to check for attribute presence We do not need bytes here.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 30 Aug 2023 13:28:09 +0200
parents 2e726c934fcd
children f4733654f144
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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
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9 from . import encoding
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10
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11
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12 def mayhavepending(root):
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13 """return whether 'root' may have pending changes, which are
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14 visible to this process.
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15 """
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16 return root == encoding.environ.get(b'HG_PENDING')
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17
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18
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19 def trypending(root, vfs, filename, **kwargs):
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20 """Open file to be read according to HG_PENDING environment variable
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21
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22 This opens '.pending' of specified 'filename' only when HG_PENDING
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23 is equal to 'root'.
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24
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25 This returns '(fp, is_pending_opened)' tuple.
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26 """
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27 if mayhavepending(root):
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28 try:
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29 return (vfs(b'%s.pending' % filename, **kwargs), True)
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30 except FileNotFoundError:
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31 pass
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32 return (vfs(filename, **kwargs), False)