Related to: https://issues.guix.gnu.org/22952
On a mate desktop (mate-desktop-service-type).
FN-F9, FN-F10 (binded to ‘decrease brightness’ and ‘increase brightness’):
> Authentication is needed to run
> '/gnu/store/mp33h4vqdw0scdkjj0v6c3gima9wz8lm-mate-power-manager-1.24.2/sbin/mate-power-backlight-helper'
> as the super user.
Contents of /etc/polkit-1/actions/org.mate.power.policy:
[...]
<icon_name>battery</icon_name>
<action id="org.mate.power.backlight-helper">
<!-- SECURITY:
- A normal active user on the local machine does not need permission
to change the backlight brightness.
-->
<description>Modify the laptop brightness</description>
<message>Authentication is required to modify the laptop
brightness</message>
<defaults>
<allow_any>no</allow_any>
<allow_inactive>no</allow_inactive>
<allow_active>yes</allow_active>
</defaults>
<annotate
key="org.freedesktop.policykit.exec.path">/gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager-1.24.2/sbin/mate-power-backlight-help>
</action>
[...]
FWIW, the following works as expected (no error message), using the store path
in .policy:
$ pkexec
/gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager-1.24.2/sbin/mate-power-backlight-helper
--set-brightness=300
Maybe MATE is trying the equivalent of "pkexec
/wrong/store/path/mate-power-backlight-helper --etcetera" instead
of referring to the action by name org.mate.power.backlight-helper.
Note the store path is different. Now try something different
$ which mate-power-backlight-helper
> /run/current-system/profile/sbin/mate-power-backlight-helper
$ ls -l /run/current-system/profile/sbin/mate-power-backlight-helper
> /gnu/store/ffqhy4xdpzkg06rlq76zrbwn8v3rqgw9-mate-1.24.1/sbin/mate-power-backlight-helper
Now we have three different store paths so far!
Not sure what the proper way to resolve this, and what causes the three
different store paths,
but one way to resolve this would be referring to
/run/current-system/profile/sbin/mate-power-backlight-helper
in org.mate.power.policy (untested!).
It looks like there could very well be be similar issues in (unverified):
* /etc/polkit-1/actions/org.gnome.controlcenter.remote-login-helper.policy
* /etc/polkit-1/actions/org.gnome.gnome-system-monitor.policy
* /etc/polkit-1/actions/org.gnome.settings-daemon.plugins.power.policy
* /etc/polkit-1/actions/org.gnome.settings-daemon.plugins.wacom.policy
* grep for /gnu/store/ in /etc/polkit-1/actions/*.policy
Greetings,
Maxime.
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