Mercurial > hg
view hgdemandimport/tracing.py @ 39375:38373da1af02
shelve: write metadata file on the fly if they are missing
Keeping an explicit reference to the shelve node in order to reuse it directly
if the unshelved is repeated (eg: unshelve --keep).
author | Boris Feld <boris.feld@octobus.net> |
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date | Wed, 06 Jun 2018 01:10:01 +0200 |
parents | 284440041141 |
children | 452790284a15 |
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# Support code for event tracing in Mercurial. Lives in demandimport # so it can also be used in demandimport. # # Copyright 2018 Google LLC. # # 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 contextlib import os _pipe = None _checked = False @contextlib.contextmanager def log(whencefmt, *whenceargs): global _pipe, _session, _checked if _pipe is None: if _checked: yield return _checked = True if 'HGCATAPULTSERVERPIPE' not in os.environ: yield return _pipe = open(os.environ['HGCATAPULTSERVERPIPE'], 'w', 1) _session = os.environ.get('HGCATAPULTSESSION', 'none') whence = whencefmt % whenceargs try: _pipe.write('START %s %s\n' % (_session, whence)) yield finally: _pipe.write('END %s %s\n' % (_session, whence))