~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006, 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Blackbox tests for debugger breakin"""

import os

import signal

import subprocess

import sys

import time

from bzrlib.tests import TestCase, TestSkipped

class TestBreakin(TestCase):

    # FIXME: If something is broken, these tests may just hang indefinitely in

    # wait() waiting for the child to exit when it's not going to.

    def setUp(self):

        if sys.platform == 'win32':

            raise TestSkipped('breakin signal not tested on win32')

        super(TestBreakin, self).setUp()

    # port 0 means to allocate any port

    _test_process_args = ['serve', '--port', 'localhost:0']

    def test_breakin(self):

        # Break in to a debugger while bzr is running

        # we need to test against a command that will wait for 

        # a while -- bzr serve should do

        proc = self.start_bzr_subprocess(self._test_process_args,

                env_changes=dict(BZR_SIGQUIT_PDB=None))

        # wait for it to get started, and print the 'listening' line

        proc.stdout.readline()

        # first sigquit pops into debugger

        os.kill(proc.pid, signal.SIGQUIT)

        proc.stdin.write("q\n")

        time.sleep(.5)

        err = proc.stderr.readline()

        self.assertContainsRe(err, r'entering debugger')

    def test_breakin_harder(self):

        proc = self.start_bzr_subprocess(self._test_process_args,

                env_changes=dict(BZR_SIGQUIT_PDB=None))

        # wait for it to get started, and print the 'listening' line

        proc.stdout.readline()

        # break into the debugger

        os.kill(proc.pid, signal.SIGQUIT)

        # now send a second sigquit, which should cause it to exit.  That

        # won't happen until the original signal has been noticed by the

        # child and it's run its signal handler.  We don't know quite how long

        # this will take, but if it's more than 10s then it's probably not

        # going to work.

        for i in range(100):

            time.sleep(0.1)

            os.kill(proc.pid, signal.SIGQUIT)

            # note: waitpid is different on win32, but this test only runs on

            # unix

            r = os.waitpid(proc.pid, os.WNOHANG)

            if r != (0, 0):

                # high bit says if core was dumped; we don't care

                self.assertEquals(r[1] & 0x7f, signal.SIGQUIT)

                break

        else:

            self.fail("subprocess wasn't terminated by repeated SIGQUIT")

    def test_breakin_disabled(self):

        proc = self.start_bzr_subprocess(self._test_process_args,

                env_changes=dict(BZR_SIGQUIT_PDB='0'))

        # wait for it to get started, and print the 'listening' line

        proc.stdout.readline()

        # first hit should just kill it

        os.kill(proc.pid, signal.SIGQUIT)

        proc.wait()