mercurial/txnutil.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Thu, 07 Mar 2024 04:15:23 +0100
changeset 51536 718f28ea3af4
parent 49306 2e726c934fcd
permissions -rw-r--r--
branchcache: add a "pure topological head" fast path In a narrow but actually quick common case, all topological heads are all on the same branch and all open. In this case, computing the branch map is very simple. We can quickly detect situation where this situation will not change. So we update the V3 format to be able to express this situation and upgrade the update code to detect we remains in that mode. The branch cache is populated with the actual value when the branch map is accessed, but the update_disk method can do the update without needing to populate it.
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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)