mercurial/txnutil.py
author Augie Fackler <augie@google.com>
Sun, 18 Feb 2018 14:25:03 -0500
changeset 36310 ea62c2df882d
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child 43076 2372284d9457
permissions -rw-r--r--
largefiles: make scheme regex a bytes regex # skip-blame just a b prefix Differential Revision: https://phab.mercurial-scm.org/D2338
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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 __future__ import absolute_import
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import errno
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from . import (
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    encoding,
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)
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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('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('%s.pending' % filename, **kwargs), True)
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        except IOError as inst:
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            if inst.errno != errno.ENOENT:
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                raise
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    return (vfs(filename, **kwargs), False)