contrib/showstack.py

chgserver: mangle server address to include confighash

Before this patch, chgserver will use the address provided by the client. The
new design is one server per confighash. This patch appends "-$confighash" to
the address the client provides. To maintain the compatibility and make sure
the client can connect to the server, a symbolic link is created at the original
address pointing to the new address.

The address is intentionally mangled at the server, instead of being pre-
calculated by some other process (eg. a previous server). In this way, we can
avoid file system race conditions.

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

import sys, signal, traceback

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

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