mercurial/txnutil.py
author Raphaël Gomès <rgomes@octobus.net>
Thu, 03 Nov 2022 16:30:35 +0100
branchstable
changeset 49569 5318ac25dfdc
parent 49306 2e726c934fcd
child 51863 f4733654f144
permissions -rw-r--r--
rhg: add a config option to fall back immediately This is useful for debugging the behavior of the "default" `hg` in tests without having to manually substitute the fallback path.
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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)