/usr/share/backintime/common/driveinfo.py is in backintime-common 1.1.12-1.
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 configfile
import sys
import tools
class DriveInfo( configfile.ConfigFile ):
def __init__( self, path ):
configfile.ConfigFile.__init__( self )
self.path = path
self.load( self._get_driveinfo_file_() )
dirty = False
if sys.platform == 'win32':
#there is nothing to do
pass
else:
if not self.has_value( 'hardlinks' ):
self.set_bool_value( 'hardlinks', self._check_hardlinks_() )
dirty = True
if not self.has_value( 'permissions' ):
self.set_bool_value( 'permissions', self._check_perms_() )
dirty = True
if not self.has_value( 'usergroup' ):
self.set_bool_value( 'usergroup', self._check_usergroup_() )
dirty = True
if dirty:
self.save( self._get_driveinfo_file_() )
def support_hardlinks( self ):
return self.get_bool_value( 'hardlinks', False )
def support_permissions( self ):
return self.get_bool_value( 'permissions', False )
def support_usergroup( self ):
return self.get_bool_value( 'usergroup', False )
def _get_driveinfo_file_( self ):
return os.path.join( self.path, 'driveinfo' )
def _check_hardlinks_( self ):
tmp_path = os.path.join( self.path, 'driveinfo.tmp' )
tools.make_dirs( tmp_path )
if not os.path.isdir( tmp_path ):
return False
file1_path = os.path.join( tmp_path, 'file1' )
file2_path = os.path.join( tmp_path, 'file2' )
ret_val = False
os.system( "echo abc > \"%s\"" % file1_path )
os.system( "ln \"%s\" \"%s\"" % ( file1_path, file2_path ) )
os.system( "echo abc > \"%s\"" % file2_path )
if os.path.exists( file1_path ) and os.path.exists( file2_path ):
try:
info1 = os.stat( file1_path )
info2 = os.stat( file2_path )
if info1.st_size == info2.st_size:
ret_val = True
except:
pass
os.system( "rm -rf \"%s\"" % tmp_path )
return ret_val
def _check_perms_for_file_( self, file_path, mode ):
ret_val = False
os.system( "chmod %s \"%s\"" % ( mode, file_path ) )
try:
info = "%o" % os.stat( file_path ).st_mode
info = info[ -3 : ]
if info == mode:
ret_val = True
except:
pass
return ret_val
def _check_perms_( self ):
tmp_path = os.path.join( self.path, 'driveinfo.tmp' )
tools.make_dirs( tmp_path )
if not os.path.isdir( tmp_path ):
return False
file_path = os.path.join( tmp_path, 'file' )
os.system( "echo abc > \"%s\"" % file_path )
if not os.path.isfile( file_path ):
return False
ret_val = False
if self._check_perms_for_file_( file_path, '111' ):
if self._check_perms_for_file_( file_path, '700' ):
if self._check_perms_for_file_( file_path, '600' ):
if self._check_perms_for_file_( file_path, '711' ):
if self._check_perms_for_file_( file_path, '300' ):
if self._check_perms_for_file_( file_path, '666' ):
ret_val = True
os.system( "rm -rf \"%s\"" % tmp_path )
return ret_val
def _check_usergroup_( self ):
tmp_path = os.path.join( self.path, 'driveinfo.tmp' )
tools.make_dirs( tmp_path )
if not os.path.isdir( tmp_path ):
return False
file_path = os.path.join( tmp_path, 'file' )
os.system( "echo abc > \"%s\"" % file_path )
if not os.path.isfile( file_path ):
return False
ret_val = False
uid = os.getuid()
gid = os.getgid()
try:
info = os.stat( file_path )
if info.st_uid == uid and info.st_gid == gid:
ret_val = True
except:
pass
if ret_val and uid == 0:
#try to change the group
import grp
#search for another group
new_gid = gid
new_name = ''
for group in grp.getgrall():
if group.gr_gid != gid:
new_gid = group.gr_gid
new_name = group.gr_name
break
if new_gid != gid:
os.system( "chgrp %s \"%s\"" % ( new_name, file_path ) )
try:
info = os.stat( file_path )
if info.st_gid != new_gid:
ret_val = False
except:
ret_val = False
os.system( "rm -rf \"%s\"" % tmp_path )
return ret_val
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