Mercurial > hg
view mercurial/revlogutils/concurrency_checker.py @ 50076:63c4e9639753
dirstate: generalize the dirstate's invalidation on transaction abort
The previous code was too specific, we should add the invalidation at next to
the `addfilegenerator` in the `write` call.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 16 Feb 2023 02:34:54 +0100 |
parents | e9901d01d135 |
children |
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from ..i18n import _ from .. import error def get_checker(ui, revlog_name=b'changelog'): """Get a function that checks file handle position is as expected. This is used to ensure that files haven't been modified outside of our knowledge (such as on a networked filesystem, if `hg debuglocks` was used, or writes to .hg that ignored locks happened). Due to revlogs supporting a concept of buffered, delayed, or diverted writes, we're allowing the files to be shorter than expected (the data may not have been written yet), but they can't be longer. Please note that this check is not perfect; it can't detect all cases (there may be false-negatives/false-OKs), but it should never claim there's an issue when there isn't (false-positives/false-failures). """ vpos = ui.config(b'debug', b'revlog.verifyposition.' + revlog_name) # Avoid any `fh.tell` cost if this isn't enabled. if not vpos or vpos not in [b'log', b'warn', b'fail']: return None def _checker(fh, fn, expected): if fh.tell() <= expected: return msg = _(b'%s: file cursor at position %d, expected %d') # Always log if we're going to warn or fail. ui.log(b'debug', msg + b'\n', fn, fh.tell(), expected) if vpos == b'warn': ui.warn((msg + b'\n') % (fn, fh.tell(), expected)) elif vpos == b'fail': raise error.RevlogError(msg % (fn, fh.tell(), expected)) return _checker