mercurial/txnutil.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Wed, 13 Mar 2024 12:02:06 +0100
changeset 51599 b0aaffcb6fcf
parent 49306 2e726c934fcd
permissions -rw-r--r--
tags-cache: directly perform a monimal walk for hgtagsfnodescache warming We do something narrower than the path retrieving data. So lets use dedicated code instead. This provides further useful speedup: ### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog # benchmark.name = hg.debug.debug-update-cache # bin-env-vars.hg.flavor = default # bin-env-vars.hg.py-re2-module = default # benchmark.variants.pre-state = warm before-this-series: 19.947581 skip-fnode-filter: 18.916804 (-5.17%, -1.03) use-rev-num: 17.493725 (-12.30%, -2.45) this-changesets: 15.919466 (-20.19%, -4.03)
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# txnutil.py - transaction related utilities
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#
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#  Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from . import encoding
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def mayhavepending(root):
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    """return whether 'root' may have pending changes, which are
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    visible to this process.
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    """
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    return root == encoding.environ.get(b'HG_PENDING')
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def trypending(root, vfs, filename, **kwargs):
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    """Open  file to be read according to HG_PENDING environment variable
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    This opens '.pending' of specified 'filename' only when HG_PENDING
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    is equal to 'root'.
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    This returns '(fp, is_pending_opened)' tuple.
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    """
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    if mayhavepending(root):
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        try:
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            return (vfs(b'%s.pending' % filename, **kwargs), True)
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        except FileNotFoundError:
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            pass
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    return (vfs(filename, **kwargs), False)