/usr/bin/sugar-backlight-setup is in sugar-session 0.110.0-3.
This file is owned by root:root, with mode 0o755.
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 | #!/usr/bin/python
# Copyright (C) 2015 Martin Abente Lahaye <tch@sugarlabs.org>
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import os
import sys
from functools import cmp_to_key
from gi.repository import GUdev
class SugarBacklightSetup:
SUGAR_LINK = '/var/run/sugar-backlight'
def __init__(self):
self._path = None
self._get_best_backlight()
self._create_link()
def _get_best_backlight(self):
client = GUdev.Client()
devices = client.query_by_subsystem('backlight')
if not devices:
raise LookupError('No backlight devices present')
devices.sort(key=cmp_to_key(SugarBacklightSetup._sort_criteria))
self._path = devices[0].get_sysfs_path()
@staticmethod
def _sort_criteria(ldevice, rdevice):
if ldevice.get_sysfs_attr('type') == 'firmware':
return 1
if ldevice.get_sysfs_attr('type') == 'platform' and \
rdevice.get_sysfs_attr('type') == 'raw':
return 1
return -1
def _create_link(self):
if os.path.exists(self.SUGAR_LINK):
os.unlink(self.SUGAR_LINK)
os.symlink(self._path, self.SUGAR_LINK)
def _main():
try:
SugarBacklightSetup()
except Exception as err:
print 'Could not create device link: %s' % str(err)
sys.exit(1)
if __name__ == '__main__':
_main()
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