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118 lines
3.5 KiB
Python
118 lines
3.5 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 glob
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import getpass
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import subprocess
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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 required group is active and log if not."""
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# TODO test
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try:
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in_group = USER in grp.getgrnam(group).gr_mem
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except KeyError:
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# group doesn't exist. Ignore
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return None
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# check if files exist with that group in /dev. Even if plugdev
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# exists, that doesn't mean that it is needed.
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used_groups = [os.stat(path).st_gid for path in glob.glob('/dev/input/*')]
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if grp.getgrnam(group).gr_gid not in used_groups:
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return None
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if not in_group:
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msg = (
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'Some devices may not be visible without being in the '
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f'"{group}" user group. Try `sudo usermod -a -G {group} {USER}` '
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'and log out and back in or restart.'
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)
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logger.warning(msg)
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return msg
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try:
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groups = subprocess.check_output('groups').decode().split()
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group_active = group in groups
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except FileNotFoundError:
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# groups command missing. Idk if any distro doesn't have it
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# but if so, cover the case.
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return None
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if in_group and not group_active:
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msg = (
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f'You are in the "{group}" group, but your session is not yet '
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'using it. Some devices may not be visible. Please log out and '
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'back in or restart'
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)
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logger.warning(msg)
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return msg
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return None
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def check_injection_rights():
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"""Check if the user may write into /dev/uinput."""
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if not os.access('/dev/uinput', os.W_OK):
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msg = (
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'Rights to write to /dev/uinput are missing, keycodes cannot '
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f'be injected. Try `sudo setfacl -m u:{USER}:rw- /dev/uinput`'
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)
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logger.error(msg)
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return msg
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return None
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def can_read_devices():
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"""Help the user to setup correct permissions."""
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if getpass.getuser() == 'root':
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return None
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input_check = check_group('input')
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plugdev_check = check_group('plugdev')
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# ubuntu. funnily, individual devices in /dev/input/ have write permitted.
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can_write = check_injection_rights()
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ret = []
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if can_write is not None:
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ret.append(can_write)
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if input_check is not None:
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ret.append(input_check)
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if plugdev_check is not None:
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ret.append(plugdev_check)
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if len(ret) > 0:
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logger.info(
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'You can also use `sudo key-mapper-service --setup-permissions` '
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'as a shortcut for mentioned commands.'
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)
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return ret
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