webp support for viewnior

[Rava]

I try to get webp support for my favourite image viewer viewnior.

I learned that it relies on gdk-pixbuf. That can be upgraded by installing webp-pixbuf-loader-20191003.fb04954-x86_64-1_slonly.txz

So I created the module webp-pixbuf-loader-20191003.fb04954-x86_64-1_slonly.xzm and activated it. Still, no support for webp.

On https://github.com/hellosiyan/Viewnior/ ... -607806767 I got the info that

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gdk-pixbuf-query-loaders --update-cache

needs to be run as root.
I checked the module, and the script it had inside that should get executed had this code:

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if [ -x /usr/bin/update-gdk-pixbuf-loaders ]; then
  /usr/bin/update-gdk-pixbuf-loaders >/dev/null 2>&1
fi

which I changed into this:

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if [ -x /usr/bin/update-gdk-pixbuf-loaders ]; then
  /usr/bin/update-gdk-pixbuf-loaders --update-cache >/dev/null 2>&1
fi

hoping that by doing so I would not need a manual

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gdk-pixbuf-query-loaders --update-cache

Still, activating my tweaked module the result was still lacking:

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root@porteus:/# cat /usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders.cache | grep webp
root@porteus:/#

Only after I manually ran the cache-update manually (like I had with the original non-tweaked module) it was okay:

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root@porteus:/# gdk-pixbuf-query-loaders --update-cache
root@porteus:/# cat /usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders.cache | grep webp
"/usr/lib64/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-webp.so"
"webp" 5 "gdk-pixbuf" "The WebP image format" "LGPL"
"image/webp" "audio/x-riff" ""
"webp" ""

Can anyone enlighten me why that is?

Is /var/lib/pkgtools/scripts/webp-pixbuf-loader-20191003.fb04954-x86_64-1_slonly not executed when the module got activated?
And if it is, why does the cache-update not work?

P.S.
In case a moderator might wonder: I plan on uploading the module as soon as the issue with the cache update is fixed. So this post is in the correct sub-forum. The module just needs some fine tuning.