Mercurial > hg
view mercurial/txnutil.py @ 51009:ffb393dd5999
perf: ensure all readlog's reading is done within a `reading` context
We are about to enforce this at the revlog level, so we update the perf code in
advance.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Mon, 25 Sep 2023 11:23:38 +0200 |
parents | 2e726c934fcd |
children | f4733654f144 |
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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 . 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 FileNotFoundError: pass return (vfs(filename, **kwargs), False)