contrib/showstack.py

py3: hack around inconsistency of type of name passed to DNSQuestion

I don't like this patch but this is the easiest way I could fix it. There are
some callers which pass name which is bytes, some pass name which is str. I just
encode() that if that's str.

This does makes test-paths.t pass, but I am not confident whether the whole of
zeroconf will work on py3 or not.

Differential Revision: https://phab.mercurial-scm.org/D6511

# 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