/usr/share/checkbox/plugins/lock_prompt.py is in checkbox 0.13.7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of Checkbox.
#
# Copyright 2008 Canonical Ltd.
#
# Checkbox 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 3 of the License, or
# (at your option) any later version.
#
# Checkbox 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 Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
import os
import fcntl
import posixpath
import signal
from time import time
from gettext import gettext as _
from checkbox.contrib.glock import GlobalLock, LockAlreadyAcquired
from checkbox.lib.safe import safe_make_directory
from checkbox.properties import Int, Path
from checkbox.plugin import Plugin
class LockPrompt(Plugin):
# Filename where the application lock is stored.
filename = Path(default="%(checkbox_data)s/lock")
# Timeout after which to show an error prompt.
timeout = Int(default=0)
def register(self, manager):
super(LockPrompt, self).register(manager)
self._lock = None
self._manager.reactor.call_on(
"prompt-begin", self.prompt_begin, -1000)
def prompt_begin(self, interface):
directory = posixpath.dirname(self.filename)
safe_make_directory(directory)
# Try to lock the process
self._lock = GlobalLock(self.filename)
try:
self._lock.acquire()
except LockAlreadyAcquired:
if time() - os.stat(self.filename).st_atime > self.timeout:
self._manager.reactor.fire("prompt-error", interface,
_("There is another checkbox running. Please close it first."))
self._manager.reactor.stop_all()
# Stop the process if the lock is deleted
def handler(signum, frame):
if not posixpath.exists(self.filename):
self._manager.reactor.stop_all()
signal.signal(signal.SIGIO, handler)
fd = os.open(directory, os.O_RDONLY)
fcntl.fcntl(fd, fcntl.F_SETSIG, 0)
fcntl.fcntl(fd, fcntl.F_NOTIFY, fcntl.DN_DELETE|fcntl.DN_MULTISHOT)
factory = LockPrompt
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