GNOME Builder - how to allow access to /usr/share/grub/themes

Hi, I’m trying to create a GNOME application to configure GRUB, using GNOME Builder and Python, with the Flatpak GNOME 41 runtime. The problem is that the themes list can’t populate due to the Flatpak runtime not having access to /usr/share/grub/themes. How do I specify that it should have access to that directory?

You’ll need --filesystem=host in your manifest and then to access it using /var/run/host/usr/share/grub/themes.

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Thanks so much for your help!

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