view hgdemandimport/tracing.py @ 44092:833210fbd900

graftcopies: remove `skip` and `repo` arguments

The `skip` argument was added in 2ba6c9b4e0eb (rebase: fix bug that
caused transitive copy records to disappear (issue4192), 2014-06-07)
in order to fix https://bz.mercurial-scm.org/show_bug.cgi?id=4192. I
ran tests at that commit without the `skiprev` argument and the only
difference I noticed was that `test-rebase-collapse.t` failed
differently, in the call that is now on line 501. Without the
`skiprev` argument, that call would end up creating another commit
because it tried to record an invalid copy. With the previous patch in
this series, such invalid copies are no longer recorded, so it seems
we don't need the `skip` argument anymore.

I also removed the `repo` argument since that also becomes unused with
the removal of the `skip` argument.

Differential Revision: https://phab.mercurial-scm.org/D7860

# 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
_session = 'none'


def _isactive():
    global _pipe, _session, _checked
    if _pipe is None:
        if _checked:
            return False
        _checked = True
        if 'HGCATAPULTSERVERPIPE' not in os.environ:
            return False
        _pipe = open(os.environ['HGCATAPULTSERVERPIPE'], 'w', 1)
        _session = os.environ.get('HGCATAPULTSESSION', 'none')
    return True


@contextlib.contextmanager
def log(whencefmt, *whenceargs):
    if not _isactive():
        yield
        return
    whence = whencefmt % whenceargs
    try:
        # Both writes to the pipe are wrapped in try/except to ignore
        # errors, as we can see mysterious errors in here if the pager
        # is active. Presumably other conditions could trigger
        # problems too.
        try:
            _pipe.write('START %s %s\n' % (_session, whence))
        except IOError:
            pass
        yield
    finally:
        try:
            _pipe.write('END %s %s\n' % (_session, whence))
        except IOError:
            pass


def counter(label, amount, *labelargs):
    if not _isactive():
        return
    l = label % labelargs
    # See above in log() for why this is in a try/except.
    try:
        _pipe.write('COUNTER %s %d %s\n' % (_session, amount, l))
    except IOError:
        pass