Having flatpak installed breaks xdg-open mimetype functionality?

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1

Configuring mimetypes declaratively was one thing I was super excited to do with nixos, since its historically always been the cause of a lot of loss of sanity with linux.

However, I noticed recently that if I install Flatpak, then every single url opens in the flatpak portal/opener instead, which completely ignores all of my file associations and mime types :frowning: After investigating deeper, I noticed that in the source code for xdg-open the end of the switch will prioritise flatpak over the generic opener that uses mime types.

I assume this is the cause of the issue, but how do I fix this / why is this the default behavior? Iā€™m running sway, so none of the DE openers trigger. Is it possible to make the flatpak opener use the mimeapps.list or make it skip that entirely?
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2

The flatpak branch should only be called when xdg-open is executed from Flatpak app:

What do you mean by ā€œevery single URLā€? From which app and how are you you opening the links? Are you just calling xdg-open https://example.com in terminal emulator? Did you install it through Nix or Flatpak?

3

Im simply calling xdg-open from a terminal emulator. Every single app on my system is currently installed through Nix, but xdg-open opens through the flatpak opener in all the apps anyway for some reason. Heres my Flatpak config: https://github.com/bluskript/nix-config/blob/63cfa5959c824d62ce3dae360656d4f489f5375c/hosts/common/flatpak.nix

xdgOpenUsePortal seems like the culpritā€¦ but why would it ignore my mime type associations? The portal is necessary for flatpaks apps to be able to open links outside of flatpak, so Iā€™m tempted to keep it.

4

Hey, Iā€™ve got the exact same problem. I want to open librewolf but brave browser is the first thing to open when I use xdg-open <URL>.

6

Run these commands and try again:

$ systemctl --user import-environment PATH
$ systemctl --user restart xdg-desktop-portal
7

Hi,
I got the same problem here!

When running XDG_UTILS_DEBUG_LEVEL=2 xdg-open ... I always got Selected DE flatpak .... It seems xdg stuff detects me as in flatpak. But actually I am running niri and the involved application are all installed natively by Nix.

xdgOpenUsePortal = false solves the problem for me. Guess we need to dig into xdg-utilsā€™ codebase to figure out why. (For anyone seeking solutions: this requires reboot to take effect)