view mercurial/stack.py @ 41462:9b2b8794f801

hgweb: log error before attempting I/O

Previously, an uncaught exception during HTTP request serving would
attempt to send an error response then log the exception.

If an exception occurred during I/O, this exception would be
raised and the original exception wouldn't be logged.

This commit changes behavior so the original exception is logged
first, before we attempt to do anything else. This ensures the
exception is logged.

This change resulted in new tracebacks appearing in various tests.

Because tracebacks can vary between Python versions, we added a
simple script to filter the stack part of traceback lines. This
makes testing much simpler, as we don't need to glob over lines
and make lines conditional.

Differential Revision: https://phab.mercurial-scm.org/D5749

# stack.py - Mercurial functions for stack definition
#
#  Copyright Matt Mackall <[e-mail]> and other
#
# 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

from . import (
    revsetlang,
    scmutil,
)

def getstack(repo, rev=None):
    """return a sorted smartrev of the stack containing either rev if it is
    not None or the current working directory parent.

    The stack will always contain all drafts changesets which are ancestors to
    the revision and are not merges.
    """
    if rev is None:
        rev = '.'

    revspec = 'reverse(only(%s) and not public() and not ::merge())'
    revset = revsetlang.formatspec(revspec, rev)
    revisions = scmutil.revrange(repo, [revset])
    revisions.sort()
    return revisions