Use fenix

flake.lock

@@ -1,5 +1,26 @@
 {
   "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1636266227,
+        "narHash": "sha256-jpzbQyCOPsF0LH9YLURtB7IPByBu7O68eH3gM6wtNnk=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "bac0e0578a1968fd7640c2f884e9c14c22856fd1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1634851050,
@@ -52,10 +73,28 @@
     },
     "root": {
       "inputs": {
+        "fenix": "fenix",
         "flake-utils": "flake-utils",
         "naersk": "naersk",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1636213292,
+        "narHash": "sha256-o3BRalwpM+Rpb35zwE7G+SGv0FB4Bqdv20RAAOTKAzA=",
+        "owner": "rust-analyzer",
+        "repo": "rust-analyzer",
+        "rev": "2c29bd738be862efe9e6c07a0b6ef95cbe37de15",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-analyzer",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -3,19 +3,27 @@
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     naersk = {
       url = "github:nmattia/naersk";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  outputs = { self, nixpkgs, flake-utils, naersk }:
+  outputs = { self, nixpkgs, flake-utils, fenix, naersk }:
     flake-utils.lib.eachDefaultSystem (
       system: let
         pkgs = import nixpkgs {
           inherit system;
         };
-        naersk-lib = naersk.lib."${system}";
+        rustToolchain = fenix.packages."${system}".stable.defaultToolchain;
+        naersk-lib = naersk.lib.${system}.override {
+          cargo = rustToolchain;
+          rustc = rustToolchain;
+        };
       in
         rec {
           packages.azirevpn = naersk-lib.buildPackage {
@@ -30,11 +38,8 @@
           devShell = pkgs.mkShell {
             name = "azirevpn-env";
             buildInputs = [
-              pkgs.cargo
+              rustToolchain
-              pkgs.clippy
               pkgs.rust-analyzer
-              pkgs.rustc
-              pkgs.rustfmt
             ];
           };
         }