/usr/share/pyshared/DiskManager/Fstab/EventHandler.py is in disk-manager 1.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# EventHandler.py : Execute actions on events detection
# Copyright (C) 2007 Mertens Florent <flomertens@gmail.com>
#
# 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
#
import os
import time
import logging
import threading
from Fstabconfig import *
from Fstab import *
from FstabError import *
class EventHandler :
def __init__(self, disk, enable_watch) :
self.disk = disk
self.enable_watch = enable_watch
self.filename = self.disk.filename
self.inhibit = False
self.start_watch()
def start_watch(self) :
if not self.enable_watch :
return
logging.debug("Starting Watch...")
self.th_watch = threading.Thread(target=self.start_watch_thread, name="WatchThread")
self.th_watch.setDaemon(True)
self.th_watch.start()
def start_watch_thread(self) :
self.alive = True
self.mtime_mtab = os.stat(MTAB).st_mtime
self.mtime_fstab = os.stat(self.filename).st_mtime
self.size = [ str(k.get_free_size())[:4] for k in self.disk ]
while self.alive :
time.sleep(0.5)
if not self.inhibit and not self.mtime_fstab == os.stat(self.filename).st_mtime :
logging.debug("FSTAB update detected")
self.emit("external_fstab_changed")
if not self.inhibit and not self.mtime_mtab == os.stat(MTAB).st_mtime :
logging.debug("MTAB update detected")
self.emit("external_mtab_changed")
if not self.inhibit and not self.size == [ str(k.get_free_size())[:4] for k in self.disk ] :
logging.debug("Size update detected")
self.emit("size_changed")
def stop_watch(self) :
if hasattr(self, "th_watch") and self.th_watch.isAlive() :
self.alive = False
logging.debug("Stopping Watch...")
self.th_watch.join()
def shutdown(self) :
t = time.time()
self.stop_watch()
logging.debug("EventHandler shutdown in %s s", time.time() -t)
def emit(self, event) :
if not hasattr(self, "on_%s" % event) :
raise UnknowEvent(self, event)
t = time.time()
logging.debug("Emitting '%s' event" % event)
if getattr(self, "on_%s" % event)() :
if hasattr(self, "%s_fct" % event) :
fct = getattr(self, "%s_fct" % event)
if callable(fct[0]) :
logging.debug("-> Call %s%s for event '%s'" % (fct[0].__name__, fct[1], event))
fct[0](*fct[1])
else :
logging.debug("-> No function define for event '%s'" % event)
logging.debug("Event '%s' managed in %s s", event, time.time() -t)
def on_external_fstab_changed(self) :
fstab = MntFile(self.filename)
if self.disk.fstab[:] == fstab[:] :
self.mtime_fstab = os.stat(self.filename).st_mtime
logging.debug("In fact, no real changes.")
return False
self.disk._rebuild_object(fstab)
self.disk._current = self.disk.copy()
self.disk._current.fstab = self.disk.fstab.copy()
self.emit("external_changed")
self.mtime_fstab = os.stat(self.filename).st_mtime
def on_external_mtab_changed(self) :
mtab = MntFile(MTAB, minimal = True)
self.disk._build_object(self.disk.fstab)
self.disk._current = self.disk.copy()
self.disk._current.fstab = self.disk.fstab.copy()
self.emit("external_changed")
self.mtime_mtab = os.stat(MTAB).st_mtime
self.size = [ str(k.get_free_size())[:4] for k in self.disk ]
def on_internal_changed_prepare(self) :
logging.debug("Inhibit watch for internal change...")
self.inhibit = True
def on_internal_changed_cancel(self) :
logging.debug("Restart watch...")
self.inhibit = False
def on_internal_changed(self) :
self.emit("configuration_changed")
self.mtime_mtab = os.stat(MTAB).st_mtime
self.mtime_fstab = os.stat(self.filename).st_mtime
self.size = [ str(k.get_free_size())[:4] for k in self.disk ]
logging.debug("Restart watch...")
self.inhibit = False
def on_external_changed(self) :
self.emit("configuration_changed")
def on_configuration_changed(self) :
self.emit("any_changed")
def on_size_changed(self) :
self.emit("any_changed")
self.size = [ str(k.get_free_size())[:4] for k in self.disk ]
def on_any_changed(self) :
return True
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