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79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# key-mapper - GUI for device specific keyboard mappings
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# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
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#
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# This file is part of key-mapper.
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#
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# key-mapper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# key-mapper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with key-mapper. If not, see <https://www.gnu.org/licenses/>.
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"""To check if access to devices in /dev is possible."""
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import grp
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import getpass
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import os
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from keymapper.logger import logger
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from keymapper.paths import USER
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def check_group(group):
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"""Check if the user can access files of that group.
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Returns True if this group doesn't even exist.
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"""
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try:
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return USER in grp.getgrnam(group).gr_mem
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except KeyError:
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return True
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def can_read_devices():
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"""If the people ever looks into the console, make sure to help them."""
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is_root = getpass.getuser() == 'root'
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is_input = check_group('input')
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is_plugdev = check_group('plugdev')
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# ubuntu. funnily, individual devices in /dev/input/ have write permitted.
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can_write = os.access('/dev/uinput', os.W_OK)
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def warn(group):
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logger.warning(
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'Some devices may not be visible without being in the '
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'"%s" user group. Try `sudo usermod -a -G %s %s` '
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'and log out and back in.',
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group,
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group,
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USER
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)
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if not is_root:
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if not is_plugdev:
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warn('plugdev')
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if not is_input:
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warn('input')
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if not can_write:
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logger.error(
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'Injecting keycodes into /dev/uinput is not permitted. '
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'Either use sudo or run '
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'`sudo setfacl -m u:%s:rw- /dev/uinput`',
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{USER}
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)
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permitted = (is_root or (is_input and is_plugdev)) and can_write
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return permitted, is_root, is_input, is_plugdev, can_write
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