L4 help: dusklight build for flathub

Hi there.

I’m about to build a flatpak for dusklight, a zelda twilight princess port for PC. I already am at a point where is builds, with metadata, for local builds. The problem is that it requires networking at build time to pull in a precompiled googles-dawn.

I honestly don’t know how to deal with it. It doesn’t seem that there is a prebuild flatpak of dawn, and self build is out of the question, since this is a HUGE project that will probably need days to build on my hardware.

My current source is (metainfo commented out, because not required here). Now this works, locally.

app-id: dev.twilitrealm.dusklight
runtime: org.freedesktop.Platform
runtime-version: "25.08"
sdk: org.freedesktop.Sdk
sdk-extensions:
  - org.freedesktop.Sdk.Extension.llvm22

command: dusklight

finish-args:
# Graphical output
  - --socket=wayland
  - --socket=fallback-x11
# Audio Support
  - --socket=pulseaudio
  - --filesystem=xdg-run/pipewire-0
# GPU Support
  - --device=dri
# Read ISO from downloads
  - --filesystem=xdg-download:ro
# Controller Support
  - --device=input

modules:
  - name: org.libsdl.SDL3
    buildsystem: cmake
    build-options:
      cflags: "-O3"
      cxxflags: "-O3"
      prepend-path: /usr/lib/sdk/llvm22/bin
      env:
        CC: clang
        CXX: clang++
    sources:
      - type: archive
        url: https://libsdl.org/release/SDL3-3.4.8.tar.gz
        sha256: e9fff7467fb60f037e6708da18b25560649e4c63edc2a69bb871b960d9cbfbba

  - name: dusklight
    buildsystem: simple
    build-options:
      build-args:
        # Network access at buildtime
        - --share=network
      cflags: "-O3"
      cxxflags: "-O3"
      prepend-path: /usr/lib/sdk/llvm22/bin
      env:
        CC: clang
        CXX: clang++
    build-commands:
      - cmake -S . -B build -DDUSK_ENABLE_UPDATE_CHECKER=OFF -DCMAKE_BUILD_TYPE=RelWithDebInfo -DSDL3_DIR=/app -DCMAKE_INSTALL_PREFIX=/app
      - cmake --build build -- -j$(nproc)
      - cmake --install build --prefix /app
    post-install:
      # Correct the binary path
      ## Dusklight needs to run from /app, but flatpak wants it to be in /app/bin.
      ## Create a little helper to do this, while keeping the working directory in /app
      - mkdir -p /app/bin
      - printf '%s\n' '#!/usr/bin/env sh' 'cd /app' 'exec /app/dusklight "$@"' > /app/bin/dusklight
      - chmod +x /app/bin/dusklight
      # Install Desktop file
      - install -Dm644 platforms/freedesktop/dusklight.desktop /app/share/applications/dev.twilitrealm.dusklight.desktop
      ## Fix up icon naming
      - sed -i 's/Icon=dusklight/Icon=dev.twilitrealm.dusklight/' /app/share/applications/dev.twilitrealm.dusklight.desktop
      # Install Icons
      - install -Dm644 platforms/freedesktop/16x16/apps/dusklight.png /app/share/icons/hicolor/16x16/apps/dev.twilitrealm.dusklight.png
      - install -Dm644 platforms/freedesktop/32x32/apps/dusklight.png /app/share/icons/hicolor/32x32/apps/dev.twilitrealm.dusklight.png
      - install -Dm644 platforms/freedesktop/48x48/apps/dusklight.png /app/share/icons/hicolor/48x48/apps/dev.twilitrealm.dusklight.png
      - install -Dm644 platforms/freedesktop/64x64/apps/dusklight.png /app/share/icons/hicolor/64x64/apps/dev.twilitrealm.dusklight.png
      - install -Dm644 platforms/freedesktop/128x128/apps/dusklight.png /app/share/icons/hicolor/128x128/apps/dev.twilitrealm.dusklight.png
      - install -Dm644 platforms/freedesktop/256x256/apps/dusklight.png /app/share/icons/hicolor/256x256/apps/dev.twilitrealm.dusklight.png
      - install -Dm644 platforms/freedesktop/512x512/apps/dusklight.png /app/share/icons/hicolor/512x512/apps/dev.twilitrealm.dusklight.png
      # Install metainfo
      ##- install -Dm644 dev.twilitrealm.dusklight.metainfo.xml /app/share/metainfo/dev.twilitrealm.dusklight.metainfo.xml
    sources:
      - type: git
        url: https://github.com/TwilitRealm/dusklight.git
        tag: v1.1.1
        commit: 7a77d48954847330a5ab55f5c7f2e64cdd25d846
        disable-shallow-clone: true
#      - type: file
#        path: dev.twilitrealm.dusklight.metainfo.xml
#        dest: .

But the moment I take away

      build-args:
        # Network access at buildtime
        - --share=network

It fails at:

-- aurora: Fetching prebuilt Dawn package from https://github.com/encounter/dawn-build/releases/download/v20260423.175430/dawn-linux-x86_64.tar.gz



          --- LOG END ---
          error: downloading 'https://github.com/encounter/dawn-build/releases/download/v20260423.175430/dawn-linux-x86_64.tar.gz' failed
          status_code: 6
          status_string: "Could not resolve hostname"
          log:
          --- LOG BEGIN ---
          Could not resolve host: github.com

  shutting down connection #0

That is completely expected

As I said, I can’t think of anything the workaround this.