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Bug#902288: Issue raised with gnome-desktop as well



To avoid duplication of work, I report my filing of the issue with
gnome-desktop:

https://gitlab.gnome.org/GNOME/gnome-desktop/issues/4

I have a feeling bubblewrapping (i.e. bwrap), strict as it is configured at the
moment, could potentially affect other packages generating thumbnails, e.g.:

$ apt-file search /usr/share/thumbnailers | column -t -s : | sort
atril-common                 /usr/share/thumbnailers/atril.thumbnailer
blender-data                 /usr/share/thumbnailers/blender.thumbnailer
dia-common                   /usr/share/thumbnailers/dia.thumbnailer
evince                       /usr/share/thumbnailers/evince.thumbnailer
exe-thumbnailer              /usr/share/thumbnailers/exe-dll-msi.thumbnailer
ffmpegthumbnailer            /usr/share/thumbnailers/ffmpegthumbnailer.thumbnailer
geogebra-gnome               /usr/share/thumbnailers/geogebra.thumbnailer
gnome-font-viewer            /usr/share/thumbnailers/gnome-font-viewer.thumbnailer
gnome-hwp-support            /usr/share/thumbnailers/hwp-thumbnailer.thumbnailer
gnome-nds-thumbnailer        /usr/share/thumbnailers/gnome-nds-thumbnailer.thumbnailer
gwyddion-common              /usr/share/thumbnailers/gwyddion.thumbnailer
heif-thumbnailer             /usr/share/thumbnailers/heif.thumbnailer
libgdk-pixbuf2.0-bin         /usr/share/thumbnailers/gdk-pixbuf-thumbnailer.thumbnailer
libgsf-bin                   /usr/share/thumbnailers/gsf-office.thumbnailer
librsvg2-common              /usr/share/thumbnailers/librsvg.thumbnailer
mate-control-center-common   /usr/share/thumbnailers/mate-font-viewer.thumbnailer
mypaint                      /usr/share/thumbnailers/mypaint-ora.thumbnailer
pentobi                      /usr/share/thumbnailers/pentobi.thumbnailer
tiled                        /usr/share/thumbnailers/tiled.thumbnailer
totem-common                 /usr/share/thumbnailers/totem.thumbnailer

Do package maintainers run tests for thumbnailers? For example, we expect
gnome-desktop to generate a thumbnail .png from the hash of the media resource
as "URI-like" (not a full URI escaping, I have noticed, just some characters):

(Python)
hashlib.md5("file://" + sys.argv[1].replace(" ", "%20")
                                   .replace("|", "%7C")).hexdigest()

do we verify that such file is created under:

$XDG_CACHE_HOME/thumbnails/GNOME_DESKTOP_THUMBNAIL_SIZE_{NORMAL,LARGE}

This would allow answering this type of questions programmatically: have
changes in gnome-desktop broken the way in which the Blender thumbnailer works?


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