+def handle_signals(signal_num, frame):
+ signal.signal(signal.SIGINT, signal.SIG_IGN)
+ signal.signal(signal.SIGTERM, signal.SIG_IGN)
+
+ log('Caught signal %s, cleaning up and exiting.' % signal_num)
+
+ mount_point = os.environ.get(MOUNT_STATE_VAR)
+ if mount_point:
+ log('Unmounting ISO from "%s"' % mount_point)
+ # Prevent 'Device or resource busy' errors when unmounting
+ os.chdir('/')
+ exec_cmd('fusermount -u %s' % mount_point, True)
+ # Be nice and remove our environment variable, even though the OS would
+ # would clean it up anyway
+ os.environ.pop(MOUNT_STATE_VAR)
+
+ sys.exit(1)
+
+