Mercurial > hg
view mercurial/txnutil.py @ 43148:843da18386d5
sidedatacopies: deal with upgrading and downgrading to that format
This is quite useful to test this on real life data.
Differential Revision: https://phab.mercurial-scm.org/D6955
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 06 Oct 2019 23:36:52 -0400 |
parents | 687b865b95ad |
children | 89a2afe31e82 |
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# txnutil.py - transaction related utilities # # Copyright FUJIWARA Katsunori <foozy@lares.dti.ne.jp> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import errno from . import encoding def mayhavepending(root): '''return whether 'root' may have pending changes, which are visible to this process. ''' return root == encoding.environ.get(b'HG_PENDING') def trypending(root, vfs, filename, **kwargs): '''Open file to be read according to HG_PENDING environment variable This opens '.pending' of specified 'filename' only when HG_PENDING is equal to 'root'. This returns '(fp, is_pending_opened)' tuple. ''' if mayhavepending(root): try: return (vfs(b'%s.pending' % filename, **kwargs), True) except IOError as inst: if inst.errno != errno.ENOENT: raise return (vfs(filename, **kwargs), False)