/usr/share/backintime/common/guiapplicationinstance.py is in backintime-common 1.1.12-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2008-2016 Oprea Dan, Bart de Koning, Richard Bailey, Germar Reitze
#
# 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.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import os
import logger
from applicationinstance import ApplicationInstance
class GUIApplicationInstance(ApplicationInstance):
'''class used to handle one application instance mechanism
'''
def __init__( self, base_control_file, raise_cmd = '' ):
'''specify the base for control files
'''
self.raise_file = base_control_file + '.raise'
self.raise_cmd = raise_cmd
super(GUIApplicationInstance, self).__init__(base_control_file + '.pid', False, False)
#remove raise_file is already exists
if os.path.exists(self.raise_file):
os.remove( self.raise_file )
self.check(raise_cmd)
self.start_application()
def check(self, raise_cmd):
'''check if the current application is already running
'''
ret = super(GUIApplicationInstance, self).check(False)
if not ret:
print("The application is already running! (pid: %s)" % self.pid)
#notify raise
try:
with open( self.raise_file, 'wt' ) as f:
f.write(raise_cmd)
except OSError as e:
logger.error('Failed to write raise file %s: [%s] %s' %(e.filename, e.errno, e.strerror))
exit(0) #exit raise an exception so don't put it in a try/except block
else:
return ret
def raise_command( self ):
'''check if the application must to be raised
return None if no raise needed, or a string command to raise
'''
ret_val = None
try:
if os.path.isfile( self.raise_file ):
with open( self.raise_file, 'rt' ) as f:
ret_val = f.read()
os.remove( self.raise_file )
except:
pass
return ret_val
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