feat(nix): flake-parts, first draft

2026-05-26 20:49:55 +00:00 · 2025-10-27 12:55:20 +00:00
parent cb7875e479
commit 68bea1816f
18 changed files with 757 additions and 1040 deletions
@@ -0,0 +1,108 @@
+args@{ pkgs, inputs, ... }:
+let
+  inherit (pkgs) lib;
+  uwuenv = import ./environment.nix args;
+  selfpkgs = inputs.self.packages.${pkgs.stdenv.system};
+in
+rec {
+  # basic, very minimal instance of the crane library with a minimal rust toolchain
+  craneLib = (inputs.crane.mkLib pkgs).overrideToolchain (_: selfpkgs.build-toolchain);
+  # the checks require more rust toolchain components, hence we have this separate instance of the crane library
+  craneLibForChecks = (inputs.crane.mkLib pkgs).overrideToolchain (_: selfpkgs.dev-toolchain);
+
+  # meta information (name, version, etc) of the rust crate based on the Cargo.toml
+  crateInfo = craneLib.crateNameFromCargoToml { cargoToml = "${inputs.self}/Cargo.toml"; };
+
+  src =
+    let
+      # see https://crane.dev/API.html#cranelibfiltercargosources
+      #
+      # we need to keep the `web` directory which would be filtered out by the regular source filtering function
+      #
+      # https://crane.dev/API.html#cranelibcleancargosource
+      isWebTemplate = path: _type: builtins.match ".*src/web.*" path != null;
+      isRust = craneLib.filterCargoSources;
+      isNix = path: _type: builtins.match ".+/nix.*" path != null;
+      webOrRustNotNix = p: t: !(isNix p t) && (isWebTemplate p t || isRust p t);
+    in
+    lib.cleanSourceWith {
+      src = inputs.self;
+      filter = webOrRustNotNix;
+      name = "source";
+    };
+
+  # common attrs that are shared between building continuwuity's deps and the package itself
+  commonAttrs =
+    {
+      profile ? "dev",
+      ...
+    }:
+    {
+      inherit (crateInfo)
+        pname
+        version
+        ;
+      inherit src;
+
+      # this prevents unnecessary rebuilds
+      strictDeps = true;
+
+      dontStrip = profile == "dev" || profile == "test";
+      dontPatchELF = profile == "dev" || profile == "test";
+
+      doCheck = true;
+
+      nativeBuildInputs = [
+        # bindgen needs the build platform's libclang. Apparently due to "splicing
+        # weirdness", pkgs.rustPlatform.bindgenHook on its own doesn't quite do the
+        # right thing here.
+        pkgs.rustPlatform.bindgenHook
+      ];
+    };
+
+  makeRocksDBEnv =
+    { rocksdb }:
+    {
+      ROCKSDB_INCLUDE_DIR = "${rocksdb}/include";
+      ROCKSDB_LIB_DIR = "${rocksdb}/lib";
+    };
+
+  # function that builds the continuwuity dependencies derivation
+  buildDeps =
+    {
+      rocksdb,
+      features,
+      commonAttrsArgs,
+    }:
+    craneLib.buildDepsOnly (
+      (commonAttrs commonAttrsArgs)
+      // {
+        env = uwuenv.buildDepsOnlyEnv // (makeRocksDBEnv { inherit rocksdb; });
+        inherit (features) cargoExtraArgs;
+      }
+
+    );
+
+  # function that builds the continuwuity package
+  buildPackage =
+    {
+      deps,
+      rocksdb,
+      features,
+      commonAttrsArgs,
+    }:
+    let
+      rocksdbEnv = makeRocksDBEnv { inherit rocksdb; };
+    in
+    craneLib.buildPackage (
+      (commonAttrs commonAttrsArgs)
+      // {
+        cargoArtifacts = deps;
+        doCheck = true;
+        env = uwuenv.buildPackageEnv // rocksdbEnv;
+        passthru.env = uwuenv.buildPackageEnv // rocksdbEnv;
+        meta.mainProgram = crateInfo.pname;
+        inherit (features) cargoExtraArgs;
+      }
+    );
+}