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c12e300bb8
Summary: Move top-level Python packages `mercurial`, `hgext` and `hgdemandimport` to a new top-level package `edenscm`. This allows the Python packages provided by the upstream Mercurial to be installed side-by-side. To maintain compatibility, `edenscm/` gets added to `sys.path` in `mercurial/__init__.py`. Reviewed By: phillco, ikostia Differential Revision: D13853115 fbshipit-source-id: b296b0673dc54c61ef6a591ebc687057ff53b22e
58 lines
1.8 KiB
Python
58 lines
1.8 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 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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localispending = root == encoding.environ.get("HG_PENDING")
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localissharedpending = root == encoding.environ.get("HG_SHAREDPENDING")
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return localispending or localissharedpending
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def mayhavesharedpending(root, sharedroot):
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"""return whether 'root' or 'sharedroot' may have pending changes, which
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are visible to this process.
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"""
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localispending = root == encoding.environ.get("HG_PENDING")
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sharedissharedpending = sharedroot == encoding.environ.get("HG_SHAREDPENDING")
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return localispending or sharedissharedpending
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def trypending(root, vfs, filename, **kwargs):
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"""Open a file to be read according to the 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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def trysharedpending(root, sharedroot, vfs, filename, **kwargs):
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if mayhavesharedpending(root, sharedroot):
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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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