view hgdemandimport/tracing.py @ 46836:80cac9936324

reabase: call rewriteutil.precheck() a bit later

We now filter out descendants of divergence-causing commits in
`_handleskippingobsolete()`. The filtered-out commits are removed from
the rebase set (`destmap` and `state`). We should therefore call
`rewriteutil.precheck()` after `_handleskippingobsolete()`. This patch
does that. It hasn't mattered so far because `rewriteutil.precheck()`
doesn't yet check for divergence, but it will soon.

This affects one test where we now fail because the user is trying to
rebase an ancestor instead of failing because they tried to rebase a
public commit. We have several similar tests just after, where we
still fail because of the phase, so that seems fine. The difference in
behavior also seems fine to me.

Differential Revision: https://phab.mercurial-scm.org/D10258

# 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