nix: get Rust 1.95.0 from rust-overlay

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: If01588c5e4399ee19bb17485f65a741b6a6a6964

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1770562336,
+        "lastModified": 1776877367,
-        "narHash": "sha256-ub1gpAONMFsT/GU2hV6ZWJjur8rJ6kKxdm9IlCT0j84=",
+        "narHash": "sha256-EHq1/OX139R1RvBzOJ0aMRT3xnWyqtHBRUBuO1gFzjI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d6c71932130818840fc8fe9509cf50be8c64634f",
+        "rev": "0726a0ecb6d4e08f6adced58726b95db924cef57",
         "type": "github"
       },
       "original": {
@@ -18,7 +18,28 @@
     },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1777346187,
+        "narHash": "sha256-oVxyGjpiIsrXhWTJVUOs38fZQkLjd0nZGOY9K7Kfot8=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "146e7bf7569b8288f24d41d806b9f584f7cfd5b5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -1,25 +1,31 @@
 {
-  description = "A microscopic fetch script in Rust, for NixOS systems";
+  description = "Microscopic fetch script in Rust, for NixOS systems";
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
 
   outputs = {
     self,
     nixpkgs,
+    rust-overlay,
   }: let
     systems = ["x86_64-linux" "aarch64-linux"];
     forEachSystem = nixpkgs.lib.genAttrs systems;
-    pkgsForEach = nixpkgs.legacyPackages;
+    pkgsForEach = system: nixpkgs.legacyPackages.${system}.extend rust-overlay.overlays.default;
   in {
     packages = forEachSystem (system: let
-      pkgs = pkgsForEach.${system};
+      pkgs = pkgsForEach system;
     in {
       default = self.packages.${system}.microfetch;
       microfetch = pkgs.callPackage ./nix/package.nix {};
-      microfetch-mold = pkgs.callPackage ./nix/package.nix {useMold = true;};
     });
 
     devShells = forEachSystem (system: {
-      default = pkgsForEach.${system}.callPackage ./nix/shell.nix {};
+      default = (pkgsForEach system).callPackage ./nix/shell.nix {};
     });
   };
 }

nix/package.nix

@@ -1,13 +1,20 @@
 {
   lib,
-  rustPlatform,
+  makeRustPlatform,
+  rust-bin,
   llvm,
 }: let
   pname = "microfetch";
   toml = (lib.importTOML ../Cargo.toml).workspace.package;
   inherit (toml) version;
+
+  toolchain = rust-bin.stable.latest;
+  rustWithToolchain = makeRustPlatform {
+    cargo = toolchain.minimal;
+    rustc = toolchain.minimal;
+  };
 in
-  rustPlatform.buildRustPackage.override {inherit (llvm) stdenv;} {
+  rustWithToolchain.buildRustPackage.override {inherit (llvm) stdenv;} {
     inherit pname version;
     src = let
       fs = lib.fileset;
@@ -16,9 +23,9 @@ in
       fs.toSource {
         root = s;
         fileset = fs.unions [
+          (s + /.cargo)
           (s + /crates)
           (s + /microfetch)
-          (s + /.cargo)
           (s + /scripts/ld-wrapper)
           (s + /Cargo.lock)
           (s + /Cargo.toml)