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c63bad51f6
This patch adds new file txnutil.py, because: - transaction.py is too large to import small utility logic - scmutil.py or so causes cyclic importing in phases.py mayhavepending() is defined separately for convenience in subsequent patch.
37 lines
1.0 KiB
Python
37 lines
1.0 KiB
Python
# 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)
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