Clapper flatpak won't launch on NixOS

[ahydronous]

The Clapper flatpak currently won't launch unless launched from the Software center or manually via the CLI.

I suspect it is the same problem the Telegram flatpak has, as it exhibits the same issues and is worked around via the same tricks.

Here is the relevant Github issue: telegramdesktop/tdesktop#27134 (comment) and they have already fixed it

[Rafostar]

I do not think this is the same issue here. We do not use Qt but GTK instead.

If this was a fresh install from store, a reboot might fix this. I have actually seen issues where newly installed apps that launch with D-Bus need to restart D-Bus service for it to work with them for some reason.

[ahydronous]

A reboot did not help, nor did an uninstall + reboot + reinstall + reboot.

If I click the icon to launch Clapper, it immediately, silently fails to launch. If I try to open an associated media file, it shows a spinner if I hover over my panel, but silently fails after trying for ~15s.

Is there anything I can do to diagnose the issue further?

[Rafostar]

In this case, the best place to look at what is going on on your system is probably journalctl

[ahydronous]

The guilty error

nov 29 20:43:06 solaris-v3 dbus-daemon[1676]: [session uid=1000 pid=1676] Activating service name='com.github.rafostar.Clapper' requested by ':1.11' (uid=1000 pid=1767 comm="/nix/store/qp8wzqrlgk6b1a4gh6px8p3j08dvzbrd-gnome-" label="kernel")
nov 29 20:43:06 solaris-v3 dbus-daemon[1676]: [session uid=1000 pid=1676] Activated service 'com.github.rafostar.Clapper' failed: Failed to execute program com.github.rafostar.Clapper: No such file or directory

I'm on NixOS so I'm guessing that has something to do with it. I tried doing it extra clean with a full nixos-rebuild boot and then the full song and dance of uninstall-reboot-install-reboot, but its still not working due to being unable to find the install.

If I had to guess, maybe Clapper (or the flatpak) writes some hardcoded paths somewhere?

[Rafostar]

Here is your issue: https://discourse.nixos.org/t/some-flatpaks-fail-to-launch-from-launcher-icon/20818

[Rafostar]

Clapper also uses DBusActivatable=true to launch via DBus like mentioned there. As far as i see, fix was merged to NixOS not long ago (on October 3): NixOS/nixpkgs#222678

Dunno when these fixes reach end users, not really familiar with NixOS.

[ahydronous]

I'll try a nixos-update later tonight. If that doesn't fix it, It'll probably be fixed with 23.11 (current is 23.05 but 23.11 will launch very soon).

Thanks for bearing with me and finding the relevant NixOS problem!

I'll link the relevant issue just for posterity: NixOS/nixpkgs#138956

Edit 2023/12/02: isn't fixed in NixOS 23.11 so far