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annotate mercurial/revlogutils/concurrency_checker.py @ 51902:1c5810ce737e

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typing: add `from __future__ import annotations` to remaining source files Most of these look newer than when the original imports referenced in the previous commit were dropped, so these weren't covered by the backout. These were found with: hg files mercurial hgext hgext3rd -I '**.py' -X '**/thirdparty' \ | xargs grep -L 'from __future__ import annotations' All of the `__init__.py` files that finds are empty, so those were ignored and the rest manually edited.
author Matt Harbison <matt_harbison@yahoo.com>
date Thu, 12 Sep 2024 16:27:58 -0400
parents e9901d01d135
children
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51902
1c5810ce737e typing: add `from __future__ import annotations` to remaining source files
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1 from __future__ import annotations
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2
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3 from ..i18n import _
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4 from .. import error
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5
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6
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7 def get_checker(ui, revlog_name=b'changelog'):
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8 """Get a function that checks file handle position is as expected.
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9
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10 This is used to ensure that files haven't been modified outside of our
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11 knowledge (such as on a networked filesystem, if `hg debuglocks` was used,
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12 or writes to .hg that ignored locks happened).
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13
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14 Due to revlogs supporting a concept of buffered, delayed, or diverted
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15 writes, we're allowing the files to be shorter than expected (the data may
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16 not have been written yet), but they can't be longer.
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17
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18 Please note that this check is not perfect; it can't detect all cases (there
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19 may be false-negatives/false-OKs), but it should never claim there's an
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20 issue when there isn't (false-positives/false-failures).
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21 """
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22
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23 vpos = ui.config(b'debug', b'revlog.verifyposition.' + revlog_name)
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24 # Avoid any `fh.tell` cost if this isn't enabled.
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25 if not vpos or vpos not in [b'log', b'warn', b'fail']:
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26 return None
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27
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28 def _checker(fh, fn, expected):
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29 if fh.tell() <= expected:
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30 return
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31
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32 msg = _(b'%s: file cursor at position %d, expected %d')
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33 # Always log if we're going to warn or fail.
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34 ui.log(b'debug', msg + b'\n', fn, fh.tell(), expected)
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35 if vpos == b'warn':
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36 ui.warn((msg + b'\n') % (fn, fh.tell(), expected))
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37 elif vpos == b'fail':
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38 raise error.RevlogError(msg % (fn, fh.tell(), expected))
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39
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40 return _checker