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Deck #2028

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@ebkr ebkr commented Dec 18, 2025 •
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Steam Deck / Flatpak Support

This PR adds Flatpak building potential to r2modman which allows native installing to the deck (and running in Game Mode).

Status

As of now, this branch can be built to a Flatpak image and it will run.

It has currently broken launching of every other platform. Works great if you're on Steam Deck - not if you're a regular user.

Differences

Flatpak has an absolute ton of restrictions. To work around this for Flatpak-based installs we now do the following:

  • Invoke Steam via steam://run/<appid>.
    • A small benefit of this is that technically* you don't need to set the Steam directory.
    • It'll probably still ask you to though.
  • Require a separate launch wrapper script (part of this PR).
    • Arguments are consumed as part of a text file and not passed via CLI.
    • This is again, a limitation of Flatpak and a hacky workaround.

Work remaining

  • Fix all Game Runners
  • Prompt users to change launch arg to new web wrapper.
  • Flatpak detection to switch arg used on the copy/paste portion of the screen
  • Disable launch args if Flatpak and platform is Steam
  • Include WINEDLLOVERRIDES="winhttp=n,b" (and version[.dll] when appropriate) as an environment variable override as part of the command

Future work

  • Inform the user that their existing arguments need to be re-applied in a new format
    • Modal with a new way to enter keyValue launch arguments
      • Key/Value line item
      • Single command line item
    • New setting entry to record keyValueAdditionalLaunchArguments
    • On save, wipe the old launch args setting value

ebkr and others added 6 commits December 29, 2025 16:01
@ebkr
Added resolve to test deck support
4e1ba0b
@ebkr
Updated to latest electron-builder, added env var based flatpak building
54fdad9
@ebkr
Added steam_executable_launch.sh and ensure exists
4f2a61c
@ebkr
WIP: Steam can be launched and licence errors are shown, but games do…
86e3483 
…n't start
@ebkr
WIP: Flatpak binary can now launch games on Steam Deck
5d994cb 
- Game instructions are now passed as lists
  - All game runners need to support this (currently only SteamGameRunner_Linux.ts does)
- Additional launch arguments setting needs to be reworked to implement a key/value approach
@ebkr
Updated yarn.lock after rebase
ffff3f0
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@ebkr