view contrib/showstack.py @ 47049:25d36300ba8e stable

Backed out changeset 9b8f326731ac

Unfortunately, disabling the rust extensions means newer
Mercurial versions no longer have the persistent-nodemap
feature enabled.
This means a Mercurial 5.8.1 on RPM-based Linux distributions
will no longer be able to read repositories created
by a Mercurial 5.8 on RPM-based Linux distributions.

This violates the compatibility rules
(see https://www.mercurial-scm.org/wiki/CompatibilityRules ).

For this reason, I have to backout this change.
I'll try to find another solution to the 'hg purge' crashes.

Differential Revision: https://phab.mercurial-scm.org/D10918

# showstack.py - extension to dump a Python stack trace on signal
#
# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
r"""dump stack trace when receiving SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on BSDs)
"""

from __future__ import absolute_import, print_function
import signal
import sys
import traceback


def sigshow(*args):
    sys.stderr.write("\n")
    traceback.print_stack(args[1], limit=10, file=sys.stderr)
    sys.stderr.write("----\n")


def sigexit(*args):
    sigshow(*args)
    print('alarm!')
    sys.exit(1)


def extsetup(ui):
    signal.signal(signal.SIGQUIT, sigshow)
    signal.signal(signal.SIGALRM, sigexit)
    try:
        signal.signal(signal.SIGINFO, sigshow)
    except AttributeError:
        pass