nix: switch to crane for incramental builds

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ia5ab2f512ffac20722966b605d7eaf156a6a6964

flake.lock

@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1760924934,
+        "narHash": "sha256-tuuqY5aU7cUkR71sO2TraVKK2boYrdW3gCSXUkF4i44=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "c6b4d5308293d0d04fcfeee92705017537cad02f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1761672384,
@@ -18,6 +33,7 @@
     },
     "root": {
       "inputs": {
+        "crane": "crane",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -1,9 +1,13 @@
 {
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+    crane.url = "github:ipetkov/crane";
+  };
 
   outputs = {
     self,
     nixpkgs,
+    crane,
   }: let
     systems = ["x86_64-linux" "aarch64-linux"];
     forEachSystem = nixpkgs.lib.genAttrs systems;
@@ -14,8 +18,10 @@
       default = self.nixosModules.eris;
     };
 
-    packages = forEachSystem (system: {
-      eris = pkgsForEach.${system}.callPackage ./nix/package.nix {};
+    packages = forEachSystem (system: let
+      craneLib = crane.mkLib pkgsForEach.${system};
+    in {
+      eris = pkgsForEach.${system}.callPackage ./nix/package.nix {inherit craneLib;};
       default = self.packages.${system}.eris;
     });
 

nix/package.nix

@@ -1,28 +1,32 @@
 {
   lib,
-  rustPlatform,
+  craneLib,
 }: let
-  fs = lib.fileset;
+  pname = "eris";
+  inherit ((lib.importTOML ../Cargo.toml).package) version;
+  src = let
+    fs = lib.fileset;
+    s = ../.;
+  in
+    fs.toSource {
+      root = s;
+      fileset = fs.unions [
+        (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src))
+        (s + /Cargo.lock)
+        (s + /Cargo.toml)
+      ];
+    };
 
-  lockfile = ../Cargo.lock;
-  cargoToml = ../Cargo.toml;
+  cargoArtifacts = craneLib.buildDepsOnly {
+    name = "${pname}-deps";
+    strictDeps = true;
+    inherit src;
+  };
 in
-  rustPlatform.buildRustPackage {
-    pname = "eris";
-    version = "0.0.1";
+  craneLib.buildPackage {
+    inherit pname src version cargoArtifacts;
 
-    src = let
-      s = ../.;
-    in
-      fs.toSource {
-        root = s;
-        fileset = fs.unions [
-          (fs.fileFilter (file: builtins.any file.hasExt ["rs"]) (s + /src))
-          (s + /contrib)
-          lockfile
-          cargoToml
-        ];
-      };
+    strictDeps = true;
 
     postInstall = ''
       mkdir -p $out/share/contrib
@@ -30,10 +34,10 @@ in
       cp -rv $src/contrib/lua $out/share/contrib
     '';
 
-    cargoLock.lockFile = lockfile;
-
     meta = {
       description = "Sophisticated HTTP tarpit and honeypot stream";
+      homepage = "https://git.frzn.dev/NotAShelf/eris";
+      maintainers = [lib.maintainers.NotAShelf];
       mainProgram = "eris";
     };
   }