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annotate mercurial/txnutil.py @ 35475:b0c01a5ee35c

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lfs: narrow the exceptions that trigger a transfer retry The retries were added to workaround TCP RESETs in fb-experimental fc8c131314a9. I have no idea if that's been debugged yet, but this wide net caught local I/O errors, bad hostnames and other things that shouldn't be retried. The next patch will validate objects as they are uploaded, and there's no need to retry those errors. The spec[1] does mention that certain http errors can be retried, including 500. But let's work through the corruption detection issues first. [1] https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
author Matt Harbison <matt_harbison@yahoo.com>
date Mon, 04 Dec 2017 21:41:04 -0500
parents 206532700213
children 2372284d9457
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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206532700213 txnutil: factor out the logic to read file in according to HG_PENDING
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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)