nix: use rust-overlay for nightly Rust

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I74b2d21496261a3178ce043a5990583d6a6a6964

flake.lock

@@ -34,7 +34,28 @@
     "root": {
       "inputs": {
         "crane": "crane",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1770433312,
+        "narHash": "sha256-IaiqGwmLBrR0z67t/oaS6GIFxv9V8mDY7dBTuYVTbKY=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "9922ff9f99a6436756cbe6f5d11f9c3630e58cf0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -2,12 +2,17 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs?ref=nixpkgs-unstable";
     crane.url = "github:ipetkov/crane";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = {
     nixpkgs,
     crane,
     self,
+    rust-overlay,
     ...
   }: let
     inherit (nixpkgs) lib;
@@ -20,8 +25,16 @@
     };
 
     packages = forAllSystems (system: let
-      pkgs = nixpkgs.legacyPackages.${system};
-      craneLib = crane.mkLib pkgs;
+      pkgs = nixpkgs.legacyPackages.${system}.extend rust-overlay.overlays.default;
+      craneLib = (crane.mkLib pkgs).overrideToolchain (p:
+        # Build tools
+        # We use the rust-overlay to get the stable Rust toolchain for various targets.
+        # This is not exactly necessary, but it allows for compiling for various targets
+        # with the least amount of friction.
+          p.rust-bin.nightly.latest.default.override {
+            extensions = ["rustfmt" "rust-analyzer" "clippy"];
+            targets = [];
+          });
 
       src = let
         fs = lib.fileset;
@@ -97,8 +110,6 @@
           postgresql_18
 
           taplo
-          (rustfmt.override {asNightly = true;})
-          clippy
           cargo-nextest
         ];
       };

nix/tests/api-crud.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-api-crud";
 

nix/tests/auth-rbac.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-auth-rbac";
 

nix/tests/basic-api.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-basic-api";
 

nix/tests/e2e.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-e2e";
 

nix/tests/features.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-features";
 

nix/tests/startup.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-service-startup";
 

nix/tests/webhooks.nix

@@ -1,4 +1,7 @@
-{pkgs, self}:
+{
+  pkgs,
+  self,
+}:
 pkgs.testers.nixosTest {
   name = "fc-webhooks";