GNU bug report logs - #48265
mate-power-backlight-helper is referred to by store name instead of polkit action (IIUC)

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Package: guix; Reported by: Maxime Devos <maximedevos@HIDDEN>; dated Thu, 6 May 2021 20:25:02 UTC; Maintainer for guix is bug-guix@HIDDEN.
Did not alter fixed versions and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.

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To: Mathieu Othacehe <othacehe@HIDDEN>
Subject: Re: bug#48265: Test breakage
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Cc: =E5=AE=8B=E6=96=87=E6=AD=A6 would may otherwise miss your message.

Mathieu Othacehe <othacehe@HIDDEN> writes:

> Hello,
>
> Commit b7a8f886f5 breaks the gui-installed-desktop-os-encrypted test
> evaluation because of the following error:
>
> guix repl: error: profile contains conflicting entries for mate-polkit
> guix repl: error:   first entry: mate-polkit@HIDDEN /gnu/store/5zr0fpmkqj=
39gv4scfqwlam5yiskfgr8-mate-polkit-1.28.1
> guix repl: error:    ... propagated from mate@HIDDEN
> guix repl: error:   second entry: mate-polkit@HIDDEN /gnu/store/1aiy9ic64=
48gj88l8xllpbgk1sz628h1-mate-polkit-1.28.1
> guix repl: error:    ... propagated from xfce@HIDDEN
>
> Both xfce and mate are now exporting polkit, but xfce is exporting
> mate-polkit-for-xfce and mate is now exporting mate-polkit.
>
> As the installer test is building a profile with both polkit and xfce
> (see installation-target-desktop-os-for-gui-tests), we now have this new
> issue.
>
> Any idea how to fix that one?
>
> Thanks,
>
> Mathieu
Information forwarded to bug-guix@HIDDEN:
bug#48265; Package guix. Full text available.

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From: Mathieu Othacehe <othacehe@HIDDEN>
To: 48265 <at> debbugs.gnu.org
Subject: Test breakage
Date: Mon, 07 Jul 2025 10:23:22 +0200
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Hello,

Commit b7a8f886f5 breaks the gui-installed-desktop-os-encrypted test
evaluation because of the following error:

guix repl: error: profile contains conflicting entries for mate-polkit
guix repl: error:   first entry: mate-polkit@HIDDEN /gnu/store/5zr0fpmkqj39gv4scfqwlam5yiskfgr8-mate-polkit-1.28.1
guix repl: error:    ... propagated from mate@HIDDEN
guix repl: error:   second entry: mate-polkit@HIDDEN /gnu/store/1aiy9ic6448gj88l8xllpbgk1sz628h1-mate-polkit-1.28.1
guix repl: error:    ... propagated from xfce@HIDDEN

Both xfce and mate are now exporting polkit, but xfce is exporting
mate-polkit-for-xfce and mate is now exporting mate-polkit.

As the installer test is building a profile with both polkit and xfce
(see installation-target-desktop-os-for-gui-tests), we now have this new
issue.

Any idea how to fix that one?

Thanks,

Mathieu
Information forwarded to bug-guix@HIDDEN:
bug#48265; Package guix. Full text available.

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From: =?utf-8?B?5a6L5paH5q2m?= <iyzsong@HIDDEN>
To: Christopher League <league@HIDDEN>
Subject: Re: bug#48265: Authentication is needed to run
 mate-power-backlight-helper
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Christopher League <league@HIDDEN> writes:

> Hi, after a recent update, I am having the same authentication
> issue with the brightness helper on the Mate desktop:
>
>> Authentication is needed to run
>> /gnu/store/ra8zy...-mate-power-manager-1.28.1/sbin/
>> mate-power-backlight-helper as the super user.
>
> As noted previously on this bug report, the polkit
> org.mate.power.policy file refers to an absolute store path.
>
> But I think ultimately the problem may have to do with the fact that
> mate-power-manager APPEARS TWICE in the system closure:
>
> $ guix gc -R /gnu/store/2zf16...-system | grep mate-power
> /gnu/store/ra8zy...-mate-power-manager-1.28.1
> /gnu/store/a14gf...-mate-power-manager-1.28.1

Hello, this should be fixed with commit b7a8f886f50. Close, thanks.
Notification sent to Maxime Devos <maximedevos@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to 宋文武 <iyzsong@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 48265 <at> debbugs.gnu.org:


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Subject: Authentication is needed to run mate-power-backlight-helper
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Hi, after a recent update, I am having the same authentication
issue with the brightness helper on the Mate desktop:

> Authentication is needed to run
> /gnu/store/ra8zy...-mate-power-manager-1.28.1/sbin/
> mate-power-backlight-helper as the super user.

As noted previously on this bug report, the polkit
org.mate.power.policy file refers to an absolute store path.

But I think ultimately the problem may have to do with the fact that
mate-power-manager APPEARS TWICE in the system closure:

$ guix gc -R /gnu/store/2zf16...-system | grep mate-power
/gnu/store/ra8zy...-mate-power-manager-1.28.1
/gnu/store/a14gf...-mate-power-manager-1.28.1

The brightness function keys and the power-manager itself
attempt to invoke the 'ra8zy' path (and it's also in the
profile's sbin), but the polkit policy file permits only the 'a14gf'
path:

$ readlink -f (which mate-power-backlight-helper)
/gnu/store/ra8zy...-mate-power-manager-1.28.1/sbin/mate-power-backlight-helper

$ pkexec /gnu/store/a14gf...-mate-power-manager-1.28.1/sbin/\
mate-power-backlight-helper --set-brightness 340
# Works perfectly

$ pkexec /gnu/store/ra8zy...-mate-power-manager-1.28.1/sbin/\
mate-power-backlight-helper --set-brightness 340
# Authentication error, same as pressing brightness buttons

Looking at gnu/services/desktop.scm and gnu/packages/mate.scm,
it's unclear to me why mate-polkit-extension would end up with a
different hash for mate-power-manager than the profile does.

The effect may be reproducible just from packages, without
needing to troubleshoot the services or system. What happens if
we build mate-power-manager vs the mate union package:

$ guix build mate-power-manager
/gnu/store/a14gf...-mate-power-manager-1.28.1

That's the one in polkit.

$ guix gc -R (guix build mate) | grep mate-power
/gnu/store/ra8zy...-mate-power-manager-1.28.1

And that's the one in the profile.

Why are they different? Does it have to do with using
union-build? Apparently a similar duplication happens with xfce,
though I don't know if it leads to the same authentication
errors:

$ guix gc -R /gnu/store/2zf16...-system | grep xfce4-power
/gnu/store/8mqna...-xfce4-power-manager-4.20.0
/gnu/store/jrflf...-xfce4-power-manager-4.20.0

The exact store paths used in these examples should be
reproducible from the following minimal configuration and
relatively recent commit:

;;; BEGIN configuration.scm
(use-modules
  (gnu bootloader)
  (gnu bootloader grub)
  (gnu system file-systems)
  (gnu services desktop))

(operating-system
   (host-name "mate-power-bug")
   (bootloader (bootloader-configuration (bootloader grub-bootloader)))
   (file-systems
    (cons (file-system
            (mount-point "/")
            (device "/dev/sda1")
            (type "ext4"))
          %base-file-systems))
   (services
    (cons (service mate-desktop-service-type)
          %desktop-services)))
;; END configuration.scm

$ guix time-machine -q --commit=ed5988f0d2cf14e3cc35a32e6ad91d7cbf535e2f\
   -- system build configuration.scm
/gnu/store/2zf16...-system
Information forwarded to bug-guix@HIDDEN:
bug#48265; Package guix. Full text available.

Message received at 48265 <at> debbugs.gnu.org:


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Subject: Re: bug#48265: mate-power-backlight-helper is referred to by store
 name instead of polkit action (IIUC)
From: Maxime Devos <maximedevos@HIDDEN>
To: 48265 <at> debbugs.gnu.org
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It looks like my suspicion that "mate-power-backlight-helper" is referred t=
o by absolute
file name instead of by its polkit action is correct:
Excerpt from src/gpm-brightness.c
(https://git.mate-desktop.org/mate-power-manager/tree/src/gpm-brightness.c)

> static gboolean
> gpm_brightness_helper_set_value (const gchar *argument, gint value)
> {
>         [...]
>         /* get the data */
>         command =3D g_strdup_printf ("pkexec " SBINDIR "/mate-power-backl=
ight-helper --%s %i", argument, value);
>         ret =3D g_spawn_command_line_sync (command, NULL, NULL, &exit_sta=
tus, &error);
>         [...]
> }

Next step: look at the GNOME source code, maybe it does things differently.

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Subject: mate-power-backlight-helper is referred to by store name instead of
 polkit action (IIUC)
From: Maxime Devos <maximedevos@HIDDEN>
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>> Isn’t the problem that you reconfigured and so there’s now a mismatch
>> between the polkit rule in effect, which expects 1.24.1 (say), and the
>> version you’re running?
> I've had this problem for a month, I think? I'll try to confirm / falsify
> tomorrow. FWIW, I don't see any mate stuff in my use profile.

I booted my system, and the issue is still present.

Greetings,
Maxime.
Information forwarded to bug-guix@HIDDEN:
bug#48265; Package guix. Full text available.

Message received at 48265 <at> debbugs.gnu.org:


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Subject: Re: bug#48265: mate-power-backlight-helper is referred to by store
 name instead of polkit action (IIUC)
From: Maxime Devos <maximedevos@HIDDEN>
To: Ludovic =?ISO-8859-1?Q?Court=E8s?= <ludo@HIDDEN>
Date: Thu, 06 May 2021 23:18:59 +0200
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Ludovic Court=C3=A8s schreef op do 06-05-2021 om 23:02 [+0200]:
> Hi!
>=20
> Maxime Devos <maximedevos@HIDDEN> skribis:
>=20
> > FWIW, the following works as expected (no error message), using the sto=
re path in .policy:
> > $ pkexec /gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager=
-1.24.2/sbin/mate-power-backlight-helper --set-brightness=3D300
> > Maybe MATE is trying the equivalent of "pkexec /wrong/store/path/mate-p=
ower-backlight-helper --etcetera" instead
> > of referring to the action by name org.mate.power.backlight-helper.
> >=20
> > Note the store path is different. Now try something different
> >=20
> > $ 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-pow=
er-backlight-helper
>=20
> These are different versions (1.24.2 vs. 1.24.1).
I didn't notice that. Also, this makes the problem even weirder.
Were does the version mismatch come from?

I would try to run "guix gc --referrers /gnu/store/PATH-WITH-POWER-BACKLIGH=
T-HELPER"
as that might shed some light on the matter, but I don't have a lot of free=
 time
currently, so I'm hoping someone else fixes the bug first :p.

> But that=E2=80=99s just two store file names; where=E2=80=99s the third o=
ne?

1.: Authentication is needed to run
    /gnu/store/mp33h4vqdw0scdkjj0v6c3gima9wz8lm-mate-power-manager-1.24.2/s=
bin/mate-power-backlight-helper [...]
2.: (in org.mate.power.policy)
    /gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager-1.24.2/s=
bin/mate-power-backlight-helper
3.: $ ls -l /run/current-system/profile/sbin/mate-power-backlight-helper
    > /gnu/store/ffqhy4xdpzkg06rlq76zrbwn8v3rqgw9-mate-1.24.1/sbin/mate-pow=
er-backlight-helper

> Isn=E2=80=99t the problem that you reconfigured and so there=E2=80=99s no=
w a mismatch
> between the polkit rule in effect, which expects 1.24.1 (say), and the
> version you=E2=80=99re running?

I've had this problem for a month, I think? I'll try to confirm / falsify
tomorrow. FWIW, I don't see any mate stuff in my use profile.

Greetings,
Maxime.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Maxime Devos <maximedevos@HIDDEN>
Subject: Re: bug#48265: mate-power-backlight-helper is referred to by store
 name instead of polkit action (IIUC)
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Hi!

Maxime Devos <maximedevos@HIDDEN> skribis:

> 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=3D300
> Maybe MATE is trying the equivalent of "pkexec /wrong/store/path/mate-pow=
er-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

These are different versions (1.24.2 vs. 1.24.1).  But that=E2=80=99s just =
two
store file names; where=E2=80=99s the third one?

Isn=E2=80=99t the problem that you reconfigured and so there=E2=80=99s now =
a mismatch
between the polkit rule in effect, which expects 1.24.1 (say), and the
version you=E2=80=99re running?

(FWIW brightness change works in GNOME.)

Thanks,
Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#48265; Package guix. Full text available.

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Subject: mate-power-backlight-helper is referred to by store name instead of
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From: Maxime Devos <maximedevos@HIDDEN>
To: bug-guix@HIDDEN
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Related to: https://issues.guix.gnu.org/22952

On a mate desktop (mate-desktop-service-type).

FN-F9, FN-F10 (binded to =E2=80=98decrease brightness=E2=80=99 and =E2=80=
=98increase brightness=E2=80=99):

> Authentication is needed to run '/gnu/store/mp33h4vqdw0scdkjj0v6c3gima9wz=
8lm-mate-power-manager-1.24.2/sbin/mate-power-backlight-helper' as the supe=
r user.

Contents of /etc/polkit-1/actions/org.mate.power.policy:


  [...]
  <icon_name>battery</icon_name>
  <action id=3D"org.mate.power.backlight-helper">
    <!-- SECURITY:
          - A normal active user on the local machine does not need permiss=
ion
            to change the backlight brightness.
     -->
    <description>Modify the laptop brightness</description>
    <message>Authentication is required to modify the laptop brightness</me=
ssage>
    <defaults>
      <allow_any>no</allow_any>
      <allow_inactive>no</allow_inactive>
      <allow_active>yes</allow_active>
    </defaults>
    <annotate key=3D"org.freedesktop.policykit.exec.path">/gnu/store/zk4kb4=
437032swahywmgyzn55b5w5wj8-mate-power-manager-1.24.2/sbin/mate-power-backli=
ght-help>
  </action>
  [...]

FWIW, the following works as expected (no error message), using the store p=
ath in .policy:
$ pkexec /gnu/store/zk4kb4437032swahywmgyzn55b5w5wj8-mate-power-manager-1.2=
4.2/sbin/mate-power-backlight-helper --set-brightness=3D300
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-b=
acklight-helper

Now we have three different store paths so far!

Not sure what the proper way to resolve this, and what causes the three dif=
ferent store paths,
but one way to resolve this would be referring to /run/current-system/profi=
le/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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Acknowledgement sent to Maxime Devos <maximedevos@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#48265; Package guix. Full text available.
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