packaging: use fenix for dev shell

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "fenix": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1771226183,
+        "narHash": "sha256-AbaMtaLbe37l2VI/KSRk63PuBnX/YDDFL0G1eFMbvwI=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "2e3759c5ef51f320eb0aaf83f2a32baae33db237",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -53,6 +69,7 @@
     },
     "root": {
       "inputs": {
+        "fenix": "fenix",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "qyriad-nur": "qyriad-nur"

flake.nix

@@ -5,6 +5,10 @@
 			flake = false;
 		};
 		flake-utils.url = "github:numtide/flake-utils";
+		fenix = {
+			url = "github:nix-community/fenix";
+			flake = false;
+		};
 		qyriad-nur = {
 			url = "github:Qyriad/nur-packages";
 			flake = false;
@@ -15,11 +19,13 @@
 		self,
 		nixpkgs,
 		flake-utils,
+		fenix,
 		qyriad-nur,
 	}: flake-utils.lib.eachDefaultSystem (system: let
 		pkgs = import nixpkgs { inherit system; };
 		qpkgs = import qyriad-nur { inherit pkgs; };
 		inherit (qpkgs) lib;
+		fenixLib = import fenix { inherit pkgs; };
 
 		dynix = import ./default.nix { inherit pkgs qpkgs; };
 		extraVersions = lib.mapAttrs' (stdenvName: value: {
@@ -27,7 +33,7 @@
 			inherit value;
 		}) dynix.byStdenv;
 
-		devShell = import ./shell.nix { inherit pkgs qpkgs dynix; };
+		devShell = import ./shell.nix { inherit pkgs qpkgs dynix fenixLib; };
 		extraDevShells = lib.mapAttrs' (stdenvName: value: {
 			name = "${stdenvName}-dynix";
 			inherit value;

package.nix

@@ -77,6 +77,7 @@ in {
 		path,
 		mkShell,
 		python3Packages,
+		fenixToolchain,
 	}: let
 		mkShell' = mkShell.override { inherit stdenv; };
 		pyEnv = python3Packages.python.withPackages (p: [
@@ -87,8 +88,8 @@ in {
 		inputsFrom = [ self ];
 		packages = [
 			pyEnv
-			rustPackages.rustc
+			stdenv.cc
-			rustPackages.rustfmt
+			fenixToolchain
 		];
 		env.PYTHONPATH = [
 			"${pyEnv}/${pyEnv.sitePackages}"

shell.nix

@@ -9,10 +9,14 @@
 		src = fetchTarball "https://github.com/Qyriad/nur-packages/archive/main.tar.gz";
 	in import src { inherit pkgs; },
 	dynix ? import ./default.nix { inherit pkgs qpkgs; },
+	fenixLib ? let
+		src = fetchTarball "https://github.com/nix-community/fenix/archive/main.tar.gz";
+	in import src { inherit pkgs; },
+	fenixToolchain ? fenixLib.latest.toolchain,
 }: let
 	inherit (pkgs) lib;
 
-	mkDevShell = dynix: qpkgs.callPackage dynix.mkDevShell { };
+	mkDevShell = dynix: qpkgs.callPackage dynix.mkDevShell { inherit fenixToolchain; };
 	devShell = mkDevShell dynix;
 
 	byStdenv = lib.mapAttrs (lib.const mkDevShell) dynix.byStdenv;