bug#51968: Missing dependency for Xournal++

[Alexander Asteroth]

Hi Daniel, Hi Ludovic,

I can reproduce the missing icons issue by running 

> guix shell --pure -f xournalpp-fix.scm -- xournalpp

as suggested below. Wondering why the icons are not missing when I run
xournalpp in my environment I discovered that

> guix shell --pure gtk+ -f xournalpp-fix.scm -- xournalpp

resolves this problem.

Looking at your xournalpp-fix.scm file I wondered what the function
modify-input exactly does (and how to add gtk+ to the append clause). I
don't find neither documentation in the manuals nor code for it in a
guix checkout (when I do a recursive grep in the source for guix or gnu
modules the result is empty).

Cheers,
Alex

On Fri, Dec 17 2021, 11:06:02, Daniel Meißner 
<daniel.meissner-i4k@ruhr-uni-bochum.de> wrote:

> Hi Alexander, hi Ludo’,
>
> Ludovic Courtès writes:
>> Hi Daniel,
>>
>> Daniel Meißner <daniel.meissner-i4k@ruhr-uni-bochum.de> skribis:
>>
>>> there is a problem with the package xournalpp on Guix master.  To
>>> reproduce run:
>>>
>>> $ guix shell --pure xournalpp -- xournalpp
>
> [...]
>
>> How should this be addressed?  Adding ‘gnome-icon-theme’ as a
>> propagated input would be quite unusual, but maybe it’s become
>> necessary?
>
> I have done some more analysis.  First of all, I was wrong in pointing
> out it has to be ‘adwaita-icon-theme’ for it to work, ‘gnome-icon-theme’
> does also work.  Of course, you then get a different ‘image-missing’
> icon.  However, let me elaborate a bit:
>
> The following command tries to invoke xournalpp in a pure and
> environment.  It crashes because it cannot find ‘image-missing.png’.  It
> tries to load this icon in the first place because it cannot load its
> own toolbar icons.
>
> #+begin_src bash
>   guix shell --pure xournalpp -- xournalpp
> #+end_src
>
>
> However, when run from within Gnome it works without problems and the
> toolbar icons show up.  Running the following prevents the crash but
> most of the toolbar icons now show the ‘image-missing’ icon:
>
> #+begin_src bash
>   guix shell --pure xournalpp gnome-icon-theme
>   export XDG_DATA_DIRS=$GUIX_ENVIRONMENT/share
>   xournalpp
> #+end_src
>
>
> Depending on whether one uses ‘gnome-icon-theme’ or ‘adwaita-icon-theme’
> different icons for ‘image-missing’ are used.
>
> It seems to me that evince also does not find all of its icons.
> However, it does not crash because it has ‘adwaita-icon-theme’ as one of
> its inputs (although it is just an input, not a propagated input).  The
> missing icon is the ‘view-sidebar-symbolic-ltr’ and is complained about
> after opening some PDF.
>
> #+begin_src bash
>   guix shell --pure evince -- evince
> #+end_src
>
>
> Also in this case when run from Gnome the sidebar icon is correctly
> displayed.
>
> So in order to address the crash it seems natural to add either
> ‘gnome-icon-theme’ or ’adwaita-icon-theme’ to the list of inputs.  For
> example, the following package definition yields a “working” Xournalpp
> in the sense that it does not crash.
>
> #+begin_src scheme
> (use-modules (guix packages)
>              (gnu packages pdf)
>              (gnu packages gnome))
>
> (package/inherit xournalpp
>   (inputs (modify-inputs (package-inputs xournalpp)
>             (append adwaita-icon-theme))))
> #+end_src
>
>
> Put the above in a file named ‘xournalpp-fix.scm’ and then run:
>
> #+begin_src bash
> guix shell --pure -f xournalpp-fix.scm -- xournalpp
> #+end_src
>
> Xournalpp does not crash, however, the correct toolbar icons are still
> missing and this seems to be the actual problem.  Any ideas where to
> look for the problem?  I have not tried to run Xournalpp in an XFCE
> environment to see if the toolbar icons are missing there, too.  But
> maybe Alexander has, since he discovered the problem in the first place.
> As I am using Gnome, I have never run into this issue before despite
> having been using Xournalpp under Guix for a while now.
>
> Since evince also shows this behaviour in an isolated environment:
> Might there be a general underlying problem?
>
> Best
> Daniel

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