/usr/share/pyshared/minidinstall/Dnotify.py is in mini-dinstall 0.6.29ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | # Dnotify -*- mode: python; coding: utf-8 -*-
# A simple FAM-like beast in Python
# Copyright © 2002 Colin Walters <walters@gnu.org>
# This file 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.
import os, re, sys, string, stat, threading, Queue, time
import logging
from minidinstall import misc
class DnotifyException(Exception):
def __init__(self, value):
self._value = value
def __str__(self):
return `self._value`
class DirectoryNotifierFactory:
def create(self, dirs, use_dnotify=1, poll_time=30, logger=None, cancel_event=None):
if use_dnotify and os.access('/usr/bin/dnotify', os.X_OK):
if logger:
logger.debug("Using dnotify directory notifier")
return DnotifyDirectoryNotifier(dirs, logger)
else:
if logger:
logger.debug("Using mtime-polling directory notifier")
return MtimeDirectoryNotifier(dirs, poll_time, logger, cancel_event=cancel_event)
class DnotifyNullLoggingFilter(logging.Filter):
def filter(self, record):
return 0
class DirectoryNotifier:
def __init__(self, dirs, logger, cancel_event=None):
self._cwd = os.getcwd()
self._dirs = dirs
if cancel_event is None:
self._cancel_event = threading.Event()
else:
self._cancel_event = cancel_event
if logger is None:
self._logger = logging.getLogger("Dnotify")
self._logger.addFilter(DnotifyNullLoggingFilter())
else:
self._logger = logger
def cancelled(self):
return self._cancel_event.isSet()
class DirectoryNotifierAsyncWrapper(threading.Thread):
def __init__(self, dnotify, queue, logger=None, name=None):
if not name is None:
threading.Thread.__init__(self, name=name)
else:
threading.Thread.__init__(self)
self._eventqueue = queue
self._dnotify = dnotify
if logger is None:
self._logger = logging.getLogger("Dnotify")
self._logger.addFilter(DnotifyNullLoggingFilter())
else:
self._logger = logger
def cancel(self):
self._cancel_event.set()
def run(self):
self._logger.info('Created new thread (%s) for async directory notification' % (self.getName()))
while not self._dnotify.cancelled():
dir = self._dnotify.poll()
self._eventqueue.put(dir)
self._logger.info('Caught cancel event; async dnotify thread exiting')
class MtimeDirectoryNotifier(DirectoryNotifier):
def __init__(self, dirs, poll_time, logger, cancel_event=None):
DirectoryNotifier.__init__(self, dirs, logger, cancel_event=cancel_event)
self._changed = []
self._dirmap = {}
self._polltime = poll_time
for dir in dirs:
self._dirmap[dir] = os.stat(os.path.join(self._cwd, dir))[stat.ST_MTIME]
def poll(self, timeout=None):
timeout_time = None
if timeout:
timeout_time = time.time() + timeout
while self._changed == []:
if timeout_time and time.time() > timeout_time:
return None
self._logger.debug('Polling...')
for dir in self._dirmap.keys():
oldtime = self._dirmap[dir]
mtime = os.stat(os.path.join(self._cwd, dir))[stat.ST_MTIME]
if oldtime < mtime:
self._logger.debug('Directory "%s" has changed' % (dir,))
self._changed.append(dir)
self._dirmap[dir] = mtime
if self._changed == []:
for x in range(self._polltime):
if self._cancel_event.isSet():
return None
time.sleep(1)
ret = self._changed[0]
self._changed = self._changed[1:]
return ret
class DnotifyDirectoryNotifier(DirectoryNotifier):
def __init__(self, dirs, logger):
DirectoryNotifier.__init__(self, dirs, logger)
self._queue = Queue.Queue()
dnotify = DnotifyThread(self._queue, self._dirs, self._logger)
dnotify.start()
def poll(self, timeout=None):
# delete duplicates
i = self._queue.qsize()
self._logger.debug('Queue size: %d', (i,))
set = {}
while i > 0:
dir = self._queue_get(timeout)
if dir is None:
# We shouldn't have to do this; no one else is reading
# from the queue. But we do it just to be safe.
for key in set.keys():
self._queue.put(key)
return None
set[dir] = 1
i -= 1
for key in set.keys():
self._queue.put(key)
i = self._queue.qsize()
self._logger.debug('Queue size (after duplicate filter): %d', (i,))
return self._queue_get(timeout)
def _queue_get(self, timeout):
if timeout is None:
return self._queue.get()
timeout_time = time.time() + timeout
while 1:
try:
self._queue.get(0)
except Queue.Empty:
if time.time() > timeout_time:
return None
else:
time.sleep(15)
class DnotifyThread(threading.Thread):
def __init__(self, queue, dirs, logger):
threading.Thread.__init__(self)
self._queue = queue
self._dirs = dirs
self._logger = logger
def run(self):
self._logger.debug('Starting dnotify reading thread')
(infd, outfd) = os.pipe()
pid = os.fork()
if pid == 0:
os.close(infd)
misc.dup2(outfd, 1)
args = ['dnotify', '-m', '-c', '-d', '-a', '-r'] + list(self._dirs) + ['-e', 'printf', '"{}\\0"']
os.execv('/usr/bin/dnotify', args)
os.exit(1)
os.close(outfd)
stdout = os.fdopen(infd)
c = 'x'
while c != '':
curline = ''
c = stdout.read(1)
while c != '' and c != '\0':
curline += c
c = stdout.read(1)
if c == '':
break
self._logger.debug('Directory "%s" changed' % (curline,))
self._queue.put(curline)
(pid, status) = os.waitpid(pid, 0)
if status is None:
ecode = 0
else:
ecode = os.WEXITSTATUS(status)
raise DnotifyException("dnotify exited with code %s" % (ecode,))
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