Dummy extension simulating unsafe long running command

  $ cat > sleepext.py <<EOF

  > import time

  > import itertools

  > 

  > from mercurial import registrar

  > from mercurial.i18n import _

  > 

  > cmdtable = {}

  > command = registrar.command(cmdtable)

  > 

  > @command(b'sleep', [], _(b'TIME'), norepo=True)

  > def sleep(ui, sleeptime=b"1", **opts):

  >     with ui.uninterruptable():

  >         for _i in itertools.repeat(None, int(sleeptime)):

  >             time.sleep(1)

  >         ui.warn(b"end of unsafe operation\n")

  >     ui.warn(b"%s second(s) passed\n" % sleeptime)

  > EOF

Kludge to emulate timeout(1) which is not generally available.

  $ cat > timeout.py <<EOF

  > from __future__ import print_function

  > import argparse

  > import signal

  > import subprocess

  > import sys

  > import time

  > 

  > ap = argparse.ArgumentParser()

  > ap.add_argument('-s', nargs=1, default='SIGTERM')

  > ap.add_argument('duration', nargs=1, type=int)

  > ap.add_argument('argv', nargs='*')

  > opts = ap.parse_args()

  > try:

  >     sig = int(opts.s[0])

  > except ValueError:

  >     sname = opts.s[0]

  >     if not sname.startswith('SIG'):

  >         sname = 'SIG' + sname

  >     sig = getattr(signal, sname)

  > proc = subprocess.Popen(opts.argv)

  > time.sleep(opts.duration[0])

  > proc.poll()

  > if proc.returncode is None:

  >     proc.send_signal(sig)

  >     proc.wait()

  >     sys.exit(124)

  > EOF

Set up repository

  $ hg init repo

  $ cd repo

  $ cat >> $HGRCPATH << EOF

  > [extensions]

  > sleepext = ../sleepext.py

  > EOF

Test ctrl-c

  $ python $TESTTMP/timeout.py -s INT 1 hg sleep 2

  interrupted!

  [124]

  $ cat >> $HGRCPATH << EOF

  > [experimental]

  > nointerrupt = yes

  > EOF

  $ python $TESTTMP/timeout.py -s INT 1 hg sleep 2

  interrupted!

  [124]

  $ cat >> $HGRCPATH << EOF

  > [experimental]

  > nointerrupt-interactiveonly = False

  > EOF

  $ python $TESTTMP/timeout.py -s INT 1 hg sleep 2

  shutting down cleanly

  press ^C again to terminate immediately (dangerous)

  end of unsafe operation

  interrupted!

  [124]