bug#59579: installing zbar prevents gdm to start on Ubuntu 22.04 foreign distro

bug#59579: installing zbar prevents gdm to start on Ubuntu 22.04 foreign distro

[Clément Lassieur]

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Severity: serious

Steps to reproduce:

> - install Ubuntu 22.04
> - install Guix package manager
> - guix package -i zbar
> - reboot

Expected result

> boot

result

> login loop

It's very difficult to pin the issue down to a guix package being installed.

I imagine the bug would not happen if ~/.guix-profile/share was not in XDG_DATA_DIRS.

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bug#59579: installing zbar prevents gdm to start on Ubuntu 22.04 foreign distro

[Simon Tournier]

Hi,

On Fri, 25 Nov 2022 at 18:45, Clément Lassieur <clement@lassieur.org> wrote:

> It's very difficult to pin the issue down to a guix package being
> installed.
>
> I imagine the bug would not happen if ~/.guix-profile/share was not in
> XDG_DATA_DIRS.

Yes, it is related to XDG_DATA_DIRS and it can be tedious to find which
package brings the issue.

I had a similar issue with the package ’python-ipython’ and recently
with ’fontconfig’ – both cases running on the top of Debian.

The issue can happen whatever the profile; it just depends which ones
are sourced by your login shell.


Cheers,
simon

bug#59579: installing zbar prevents gdm to start on Ubuntu 22.04 foreign distro

[宋文武 via Bug reports for GNU Guix]

Simon Tournier <zimon.toutoune@gmail.com> writes:

> Hi,
>
> On Fri, 25 Nov 2022 at 18:45, Clément Lassieur <clement@lassieur.org> wrote:
>
>> It's very difficult to pin the issue down to a guix package being
>> installed.
>>
>> I imagine the bug would not happen if ~/.guix-profile/share was not in
>> XDG_DATA_DIRS.
>
> Yes, it is related to XDG_DATA_DIRS and it can be tedious to find which
> package brings the issue.
>
> I had a similar issue with the package ’python-ipython’ and recently
> with ’fontconfig’ – both cases running on the top of Debian.
>
> The issue can happen whatever the profile; it just depends which ones
> are sourced by your login shell.
>

Hello, I don't think XDG_DATA_DIRS should be the problems, but other
environment variables with "lib", since the xdg data should be
portable...

So:
--8<---------------cut here---------------start------------->8---
$ guix shell -C coreutils zbar --no-grafts  -- env
PS1=\u@\h \w [env]\$ 
TMPDIR=/tmp
TEMPDIR=/tmp
TMP=/tmp
TEMP=/tmp
LOGNAME=iyzsong
USER=iyzsong
HOME=/home/iyzsong
PATH=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/bin:/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/sbin
XDG_DATA_DIRS=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/share
GUIX_GTK3_PATH=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/lib/gtk-3.0
QMAKEPATH=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/lib/qt5
QT_PLUGIN_PATH=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/lib/qt5/plugins
XDG_CONFIG_DIRS=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/etc/xdg
XCURSOR_PATH=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/share/icons
GDK_PIXBUF_MODULE_FILE=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
GUIX_ENVIRONMENT=/gnu/store/yfnm6nh3a6c7hiqk1nq228wpph1x1z1w-profile
--8<---------------cut here---------------end--------------->8---

I think GUIX_GTK3_PATH, QT_PLUGIN_PATH, GDK_PIXBUF_MODULE_FILE should be
the problems.

bug#59579: installing zbar prevents gdm to start on Ubuntu 22.04 foreign distro

[zimoun]

Hi,

On Tue, 31 Jan 2023 at 14:23, 宋文武 via Bug reports for GNU Guix <bug-guix@gnu.org> wrote:

> Hello, I don't think XDG_DATA_DIRS should be the problems, but other
> environment variables with "lib", since the xdg data should be
> portable...

I had the issue yesterday on Ubuntu. :-)

> I think GUIX_GTK3_PATH, QT_PLUGIN_PATH, GDK_PIXBUF_MODULE_FILE should be
> the problems.

None of these environment variables were in my profile, IIRC.  From my
small experiment, the only common one is XDG_DATA_DIRS.  For instance, I
had the issue and I just removed the package ’fontconfig’ which fixed
the issue;  the environment variables reads,

--8<---------------cut here---------------start------------->8---
$ guix shell fontconfig --search-paths
export PATH="/gnu/store/i5rdrrdq4zi98yzcw7rza169ir1zkj6n-profile/bin${PATH:+:}$PATH"
export XDG_DATA_DIRS="/gnu/store/i5rdrrdq4zi98yzcw7rza169ir1zkj6n-profile/share${XDG_DATA_DIRS:+:}$XDG_DATA_DIRS"
--8<---------------cut here---------------end--------------->8---

The package ’zbar’ also provides XDG_DATA_DIRS.  Maybe, I am missing
something.


Cheers,
simon