GNU bug report logs - #57068
Resizing mcron job in vm-image.tmpl interferes with settings

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Package: guix; Severity: important; Reported by: Ludovic Courtès <ludo@HIDDEN>; dated Tue, 9 Aug 2022 09:31:01 UTC; Maintainer for guix is bug-guix@HIDDEN.
Added indication that bug 57068 blocks53214 Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Severity set to 'important' from 'normal' Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 57068 <at> debbugs.gnu.org:


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: 57068 <at> debbugs.gnu.org
Subject: Re: bug#57068: Resizing mcron job in vm-image.tmpl interferes with
 settings
References: <87r11p932e.fsf@HIDDEN>
Date: Tue, 09 Aug 2022 11:47:17 +0200
In-Reply-To: <87r11p932e.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22?=
 =?utf-8?Q?'s?= message of "Tue, 09 Aug 2022 11:30:33 +0200")
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:

> Commit 945ad48cd8029fa77a643e00c7fd350e98cacca0 added an mcron job to
> =E2=80=98vm-image.tmpl=E2=80=99 that resets screen size every second.  I=
=E2=80=99m don=E2=80=99t fully
> understand the problem this was addressing, but it has two drawbacks:
>
>   1. Kicking in every second is inefficient.
>
>   2. Resetting the screen size prevents users from changing it.  For
>      example, if I run:
>
>        $(guix system vm gnu/system/examples/vm-image.tmpl) -m 1024
>
>     then go to the Xfce menu, Settings -> Display, and change the screen
>     size, I have it immediately reset back to the default value.

There=E2=80=99s a third problem that I initially thought was unrelated:

  3. The mcron job starts running before =E2=80=98xorg-server=E2=80=99 is u=
p, and that
     can cause Xorg to fail to start.

Namely, if you run the command above, you=E2=80=99ll see that Xorg starts a=
nd
fails typically a few times in a row, until it eventually succeeds.  In
/var/log/messages, you can see that the =E2=80=98xorg-server=E2=80=99 proce=
ss exits with
code 1 (without any indication of what went wrong AFAICS) and the
service gets respawned.

Now if you remove the mcron job and boot the VM, the =E2=80=98xorg-server=
=E2=80=99
service successfully starts.  It=E2=80=99s 100% reproducible for me.

I suppose the =E2=80=98xrandr=E2=80=99 command can kick in too early while =
Xorg is
initializing, causing it to exit.

Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#57068; Package guix. Full text available.

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


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: bug-guix@HIDDEN
Subject: Resizing mcron job in vm-image.tmpl interferes with settings
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Hello!

Commit 945ad48cd8029fa77a643e00c7fd350e98cacca0 added an mcron job to
=E2=80=98vm-image.tmpl=E2=80=99 that resets screen size every second.  I=E2=
=80=99m don=E2=80=99t fully
understand the problem this was addressing, but it has two drawbacks:

  1. Kicking in every second is inefficient.

  2. Resetting the screen size prevents users from changing it.  For
     example, if I run:

       $(guix system vm gnu/system/examples/vm-image.tmpl) -m 1024

    then go to the Xfce menu, Settings -> Display, and change the screen
    size, I have it immediately reset back to the default value.

Should we remove this workaround, possibly finding another one?

Thanks,
Ludo=E2=80=99.
Acknowledgement sent to Ludovic Courtès <ludo@HIDDEN>:
New bug report received and forwarded. Copy sent to maxim.cournoyer@HIDDEN, bug-guix@HIDDEN. Full text available.
Report forwarded to maxim.cournoyer@HIDDEN, bug-guix@HIDDEN:
bug#57068; Package guix. Full text available.
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