[matevl]

Summary

Adds a Nix flake so the project can be built, run and developed on Nix/NixOS without installing the .NET SDK manually.

Changes

• flake.nix: provides
  • devShells.default: .NET 10 SDK plus the native libraries Avalonia needs (fontconfig, X11, GL, ...)
  • packages.default: the app built with buildDotnetModule, with LD_LIBRARY_PATH wrapped automatically via runtimeDeps
  • meta.mainProgram, so nix run works
  • Desktop entry and scalable icon installed, so the app appears in launchers
  • bin/ratiomaster-net lowercase alias next to bin/RatioMaster.NET
• deps.json: NuGet dependencies pinned for the offline Nix sandbox
• flake.lock: pinned inputs
• .envrc: use flake for direnv users
• .gitignore: ignore Nix/direnv artifacts

Build notes

• PublishSingleFile, EnableCompressionInSingleFile, PublishReadyToRun, PublishTrimmed and PublishAot are disabled through dotnetFlags for the Nix build only. Single-file compression requires a self-contained publish, which conflicts with using the Nix-provided runtime. The regular dotnet publish workflow is unchanged.
• deps.json must not contain crossgen2/runtime packs: the Nix SDK already provides them, and duplicates break the build.

Usage

nix run github:NikolayIT/RatioMaster.NET   # run
nix build                                  # build into ./result
nix develop                                # dev shell

Updating NuGet dependencies

After changing package versions, regenerate deps.json:

nix shell nixpkgs#nuget-to-json nixpkgs#dotnetCorePackages.sdk_10_0 -c bash -c '
  dotnet restore src/RatioMaster.App/RatioMaster.App.csproj \
    --packages ./nuget-pkgs -p:NuGetAudit=false &&
  nuget-to-json ./nuget-pkgs > deps.json
'
rm -rf nuget-pkgs

If deps.json contains crossgen2 or runtime pack entries (e.g. microsoft.netcore.app.crossgen2.*), remove them.

Testing

• nix build succeeds on x86_64-linux
• nix run launches the app