RetroDECK: Failed upgrade fallback

[Lazorne]

What happend?

User monkeyx.net had a power outage / computer crash in the middle of a RetroDECK cooker upgrade.

[2024-03-30 10:27:16.948] [INFO] Showing a configurator_generic_dialog
[2024-03-30 10:27:19.346] [DEBUG] Directory "/home/tim/retrodeck/RetroDECK_Updates" already exists, skipping.
[2024-03-30 10:27:19.350] [INFO] Downloading version "cooker-0.8.0b-SpermCarps" in "/home/tim/retrodeck/RetroDECK_Updates/RetroDECK-cooker.flatpak" from url: "https://github.com/XargonWan/RetroDECK-cooker/releases/download/cooker-0.8.0b-SpermCarps/RetroDECK-cooker.flatpak"
[2024-03-30 10:30:25.856] [DEBUG] Uninstalling old RetroDECK flatpak
[2024-03-30 10:30:30.560] [DEBUG] Installing new flatpak file from: "/home/tim/retrodeck/RetroDECK_Updates/RetroDECK-cooker.flatpak"
[2024-03-30 10:30:30.564] [ERROR] Flatpak file "/home/tim/retrodeck/RetroDECK_Updates/RetroDECK-cooker.flatpak" NOT FOUND. Quitting
[2024-03-30 10:30:30.567] [INFO] Showing a configurator_generic_dialog
[2024-03-30 10:30:33.872] [INFO] Showing a configurator_generic_dialog

RetroDECK did not work at all after the crash, but it started to work again after a complete reinstall.

What is the solution?

We should make some kind of tracking if the upgrade process fails or is aborted and have a recovery & cleanup path that restarts the whole upgrade process from the start if possible.