view contrib/showstack.py @ 41457:6c10eba6b9cd stable

subrepo: prohibit variable expansion on creation of hg subrepo (SEC)

It's probably wrong to expand path at localrepo.*repository() layer, but
fixing the layering issue would require careful inspection of call paths.
So, this patch adds add a validation to the subrepo constructor.

os.path.realpath(util.expandpath(root)) is what vfsmod.vfs() would do.

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