use rust-overlay

flake.nix

@@ -1,23 +1,31 @@
 {
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    rust-overlay = {
+      inputs.nixpkgs.follows = "nixpkgs";
+      url = "github:oxalica/rust-overlay";
+    };
   };
-  outputs = {nixpkgs, ...}: let
-    pkgs = nixpkgs.legacyPackages.x86_64-linux;
-    esp-rs = pkgs.callPackage ./nix/esp-rs.nix {};
+  outputs = {
+    nixpkgs,
+    rust-overlay,
+    ...
+  }: let
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+      overlays = [(import rust-overlay)];
+    };
+    rust-bin = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
   in {
     devShells.x86_64-linux.default = pkgs.mkShell {
       buildInputs = [
-        pkgs.pkg-config
-        pkgs.libudev-zero
-        pkgs.libusb1
         pkgs.espflash
         pkgs.esp-generate
         pkgs.rust-analyzer
-        esp-rs
+        rust-bin
       ];
       shellHook = ''
-        export RUSTUP_TOOLCHAIN=${esp-rs}
+        export RUSTUP_TOOLCHAIN=${rust-bin}
       '';
     };
   };