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I am trying to make gthumb the default when opening png files from the terminal

$ xdg-mime default ~/.gnome/apps/gthumb.desktop image/png

I created this symlink:

$ ls -l ~/.gnome/apps/gthumb.desktop
lrwxrwxrwx 1 gauthier gauthier 15 Jun 27 /home/gauthier/.gnome/apps/gthumb.desktop -> /usr/bin/gthumb

I expect xdg-mime query default image/png to return gthumb. Instead, it says:

$ xdg-mime query default image/png
eog.desktop

Why doesn't setting default have the effect I expect?

1 Answer 1

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Enabling debugging with the environment variable XDG_UTILS_DEBUG_LEVEL helped:

$ XDG_UTILS_DEBUG_LEVEL=2 xdg-mime default ~/.gnome/apps/gthumb.desktop 
image/png
make_default_kde: No kde runtime detected
make_default_generic /home/gauthier/.gnome/apps/gthumb.desktop image/png
Updating /home/gauthier/.local/share/applications/mimeapps.list
$ XDG_UTILS_DEBUG_LEVEL=2 xdg-mime query default image/png
Checking /home/gauthier/.config/mimeapps.list
eog.desktop

The mimeapps.list used for setting vs reading defaults is not the same. Solution (thanks to a comment here):

rm ~/.config/mimeapps.list

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