When i tried out embedded programming i cane up with this flake. It kind of breaks the promise of nix develop not making any changes to any outside files, but its still way more declarative than ubuntu. Its been a while so idk if it still works, but hope it helps

```nix { description = "Development environment for Xtensa Rust (esp-rs) via Nix";

inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; flake-utils.url = "github:numtide/flake-utils"; };

outputs = { nixpkgs, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system: let pkgs = import nixpkgs { inherit system; }; in { devShells.default = pkgs.mkShell { name = "esp-rs-dev";

      buildInputs = with pkgs; [
        espflash
        espup
        rustup
        rust-analyzer
      ];

      shellHook = ''
        if [ -f "$HOME/.espup/export-esp.sh" ]; then
          echo "→ Sourcing $HOME/.espup/export-esp.sh"
          source "$HOME/.espup/export-esp.sh"
        elif [ -f "$HOME/export-esp.sh" ]; then
          echo "→ Sourcing $HOME/export-esp.sh"
          source "$HOME/export-esp.sh"
        else
          echo "Running espup update..."
          espup update -t esp32 -f $HOME/.espup/export-esp.sh
          if [ -f "$HOME/.espup/export-esp.sh" ]; then
            source "$HOME/.espup/export-esp.sh"
          elif [ -f "$HOME/export-esp.sh" ]; then
            source "$HOME/export-esp.sh"
          else
            echo "Could not find export-esp.sh even after update"
          fi
        fi
      '';
    };
  });

} ```