nix+flake: packages+overlays: init noita-proxy

.gitignore

@@ -8,3 +8,7 @@ save_state
 /quant.ew/ewext1.dll
 /blob_guy/blob_guy/blob_guy.dll
 /blob_guy/target
+
+# Nix
+/result
+/result-man

flake.nix

@@ -25,6 +25,11 @@
     in {
       overlays = import ./nix/overlays { inherit self lib rust-overlay; };
 
+      packages = lib.mapAttrs (system: pkgs: {
+        default = self.packages.${system}.noita-proxy;
+        inherit (pkgs) noita-proxy;
+      }) pkgsFor;
+
       devShells = lib.mapAttrs
         (system: pkgs: { default = pkgs.callPackage ./nix/shell.nix { }; })
         pkgsFor;

nix/overlays/default.nix

@@ -1,9 +1,14 @@
-{ self, lib, rust-overlay }: {
+{ self, lib, rust-overlay }:
+let rustPackageOverlay = import ./rust-package.nix;
+in {
   default = lib.composeManyExtensions [
     # This is to ensure that other overlays and invocations of `callPackage`
     # receive `rust-bin`, but without hard-coding a specific derivation.
     # This can be overridden by consumers.
     self.overlays.rust-overlay
+
+    # Packages provided by this flake:
+    self.overlays.noita-proxy
   ];
 
   # This flake exposes `overlays.rust-overlay` which is automatically applied
@@ -11,4 +16,12 @@
   # the package overlay, in the event it is not already present.
   rust-overlay = final: prev:
     if prev ? rust-bin then { } else rust-overlay.overlays.default final prev;
+
+  # The overlay definition uses `rust-bin` to construct a `rustPlatform`,
+  # and `rust-bin` is not provided by this particular overlay.
+  # Prefer using `overlays.default`, or composing with `rust-overlay` manually.
+  noita-proxy = rustPackageOverlay {
+    packageName = "noita-proxy";
+    sourceRoot = self;
+  };
 }

nix/overlays/rust-package.nix

@@ -0,0 +1,20 @@
+# This function is imported as `rustPackageOverlay` in `nix/overlays/default.nix`.
+#
+# Supplies a stable `rustPlatform` from `rust-bin` to `callPackage`.
+# The `rust-overlay` must have already been composed onto the `pkgs` set.
+#
+# This prevents `rust-bin` from being an input of the package, which would
+# make it less portable.
+{ packageName, sourceRoot }:
+final: _prev:
+let
+  rust-stable = final.rust-bin.stable.latest.minimal;
+  rustPlatform = final.makeRustPlatform {
+    cargo = rust-stable;
+    rustc = rust-stable;
+  };
+in {
+  ${packageName} = final.callPackage "${../packages}/${packageName}.nix" {
+    inherit sourceRoot rustPlatform;
+  };
+}

nix/packages/noita-proxy.nix

@@ -0,0 +1,68 @@
+{ sourceRoot, lib, runCommandNoCC, rustPlatform, pkg-config, cmake, patchelf
+, openssl, libjack2, alsa-lib, libopus, wayland, libxkbcommon, libGL }:
+
+rustPlatform.buildRustPackage (finalAttrs:
+  let
+    inherit (finalAttrs) src pname version buildInputs steamworksRedist;
+    manifest = lib.importTOML "${src}/noita-proxy/Cargo.toml";
+  in {
+    pname = "noita-entangled-worlds-proxy";
+    inherit (manifest.package) version;
+
+    # The real root of the entire project.
+    # This is the only place `sourceRoot` is used.
+    src = sourceRoot;
+    # The root of this particular binary crate to build.
+    sourceRoot = "source/noita-proxy";
+
+    cargoLock.lockFile = "${src}/noita-proxy/Cargo.lock";
+
+    strictDeps = true;
+    nativeBuildInputs = [ pkg-config cmake patchelf ];
+
+    # TODO: Add dependencies for X11 desktop environments.
+    buildInputs = [
+      openssl
+      libjack2
+      alsa-lib
+      libopus
+      wayland
+      libxkbcommon
+      libGL
+      steamworksRedist
+    ];
+
+    env = {
+      OPENSSL_DIR = "${lib.getDev openssl}";
+      OPENSSL_LIB_DIR = "${lib.getLib openssl}/lib";
+      OPENSSL_NO_VENDOR = 1;
+    };
+
+    checkFlags = [
+      # Disable networked tests
+      "--skip bookkeeping::releases::test::release_assets"
+    ];
+
+    postFixup = ''
+      patchelf $out/bin/noita-proxy \
+        --set-rpath ${lib.makeLibraryPath buildInputs}
+    '';
+
+    # This attribute is defined here instead of a `let` block, because in this position,
+    # it can be overridden with `overrideAttrs`, and shares a `src` with the top-level.
+    steamworksRedist =
+      runCommandNoCC "${pname}-steamworks-redist" { inherit src; } ''
+        install -Dm555 $src/redist/libsteam_api.so -t $out/lib
+      '';
+
+    meta = {
+      description = "Noita Entangled Worlds proxy application.";
+      homepage = "https://github.com/IntQuant/noita_entangled_worlds";
+      changelog =
+        "https://github.com/IntQuant/noita_entangled_worlds/releases/tag/v${version}";
+      license = with lib.licenses; [ mit asl20 ];
+      platforms = [ "x86_64-linux" ];
+      maintainers = with lib.maintainers; [ spikespaz ];
+      mainProgram = "noita-proxy";
+    };
+  })