mercurial/txnutil.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Thu, 01 Sep 2022 15:49:14 +0200
branchstable
changeset 49469 b5c8524827d2
parent 49306 2e726c934fcd
permissions -rw-r--r--
dirstate-v2: no longer register the data-file during transaction If the data file change during the transaction, we cannot truncate it. The content of the file itself is fine as it will get backed up at the same time as the docket. Leaving the trailing data at the end of failed transaction is fine. The dirstate-v2 format supports it. The dead data will simply we written over if necessary.
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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)