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Subject: bug#48265: mate-power-backlight-helper is referred to by store name instead of polkit action (IIUC)
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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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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Maxime Devos <maximedevos@HIDDEN>
Subject: bug#48265: Acknowledgement (mate-power-backlight-helper is
 referred to by store name instead of polkit action (IIUC))
Message-ID: <handler.48265.B.162033270029416.ack <at> debbugs.gnu.org>
References: <28db052034ca1e3029bb3dc0aa9f87de2af6bdec.camel@HIDDEN>
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Date: Thu, 06 May 2021 20:25:02 +0000

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Subject: bug#48265: mate-power-backlight-helper is referred to by store name instead of polkit action (IIUC)
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Date: Thu, 06 May 2021 23:02:25 +0200
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 (Maxime Devos's message of "Thu, 06 May 2021 22:24:43 +0200")
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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.

Message sent to bug-guix@HIDDEN:

Subject: bug#48265: mate-power-backlight-helper is referred to by store name instead of polkit action (IIUC)
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From: Maxime Devos <maximedevos@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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>> 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.

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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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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

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Subject: bug#48265: closed (mate-power-backlight-helper is referred to by
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Your message dated Sun, 29 Jun 2025 09:05:15 +0800
with message-id <87sejj5pdg.fsf@HIDDEN>
and subject line Re: bug#48265: Authentication is needed to run mate-power-=
backlight-helper
has caused the debbugs.gnu.org bug report #48265,
regarding mate-power-backlight-helper is referred to by store name instead =
of polkit action (IIUC)
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@HIDDEN)


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Subject: mate-power-backlight-helper is referred to by store name instead of
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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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To: Christopher League <league@HIDDEN>
Subject: Re: bug#48265: Authentication is needed to run
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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.


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To: Maxime Devos <maximedevos@HIDDEN>
Subject: bug#48265: closed (Re: bug#48265: Authentication is needed to run
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Your bug report

#48265: mate-power-backlight-helper is referred to by store name instead of=
 polkit action (IIUC)

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 48265 <at> debbugs.gnu.org.

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48265: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D48265
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Subject: Re: bug#48265: Authentication is needed to run
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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.


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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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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

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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

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