feat: switch to oxalica/rust-overlay

.envrc

@@ -4,4 +4,4 @@ if nix flake metadata &>/dev/null; then
   use flake
 else
   use nix
-fi
+fi

default.nix

@@ -1,16 +1,27 @@
 { system ? builtins.currentSystem
 , inputs ? import ./flake.lock.nix { }
+, overlays ? [ (import inputs.rust-overlay) ]
 , nixpkgs ? import inputs.nixpkgs {
-    inherit system;
+    inherit system overlays;
     # Makes the config pure as well. See <nixpkgs>/top-level/impure.nix:
     config = { };
-    overlays = [ ];
   }
-, rustPackages ? nixpkgs.rustPackages
+, rustVersion ? nixpkgs.rust-bin.stable."1.63.0".default
 }:
 let
   lib = nixpkgs.lib;
 
+  rustVersionExtended = rustVersion.override {
+    # include source for IDE's and other tools that resolve the source automatically via
+    # $(rustc --print sysroot)/lib/rustlib/src/rust
+    extensions = [ "rust-src" "rustfmt" ];
+  };
+
+  rustPlatform = nixpkgs.makeRustPlatform {
+    cargo = rustVersionExtended;
+    rustc = rustVersionExtended;
+  };
+
   cargoToml = with builtins; (fromTOML (readFile ./Cargo.toml));
 
   # Use the Nix module system to validate the treefmt config file format.
@@ -26,7 +37,7 @@ let
     };
 
   # What is used when invoking `nix run github:numtide/treefmt`
-  treefmt = rustPackages.rustPlatform.buildRustPackage {
+  treefmt = rustPlatform.buildRustPackage {
     inherit (cargoToml.package) name version;
 
     src = builtins.path {
@@ -63,7 +74,6 @@ let
 
     nativeBuildInputs = prev.nativeBuildInputs ++ (with nixpkgs; [
       # Build tools
-      rustPackages.clippy
       rust-analyzer
 
       # Code formatters
@@ -76,7 +86,6 @@ let
       nodePackages.prettier
       python3.pkgs.black
       rufo
-      rustPackages.rustfmt
       shellcheck
       shfmt
       terraform

flake.lock

@@ -20,6 +20,21 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1663819708,
@@ -39,7 +54,29 @@
     "root": {
       "inputs": {
         "flake-parts": "flake-parts",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1670552927,
+        "narHash": "sha256-lCE51eAGrAFS4k9W5aDGFpVtOAwQQ/rFMN80PCDh0vo=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "a0fdafd18c9cf599fde17fbaf07dbb20fa57eecb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -6,15 +6,16 @@
   inputs.flake-parts.url = "github:hercules-ci/flake-parts";
   inputs.flake-parts.inputs.nixpkgs.follows = "nixpkgs";
 
-  outputs = { self, nixpkgs, flake-parts }@inputs:
+  inputs.rust-overlay.url = "github:oxalica/rust-overlay";
+  inputs.rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+
+  outputs = { self, nixpkgs, flake-parts, rust-overlay }@inputs:
     flake-parts.lib.mkFlake { inherit self; } {
       systems = nixpkgs.lib.systems.flakeExposed;
       perSystem = { system, pkgs, ... }:
         let
           packages = import ./. {
             inherit system;
-            inputs = null;
-            nixpkgs = pkgs;
           };
         in
         {