sf

modules/nixos/homeassistant/services/esphome/default.nix

@@ -1,12 +1,21 @@
 {
   config,
   lib,
+  pkgs,
   namespace,
   ...
 }:
 with lib;
 let
   cfg = config.${namespace}.services.home-assistant;
+
+  # ESPHome with littlefs-python added to PYTHONPATH so PlatformIO's
+  # espressif32 platform builder can import it (needed for LittleFS support).
+  esphomeWithLittlefs = pkgs.esphome.overridePythonAttrs (oldAttrs: {
+    makeWrapperArgs = (oldAttrs.makeWrapperArgs or [ ]) ++ [
+      "--prefix PYTHONPATH : ${pkgs.${namespace}.littlefs-python}/${pkgs.python3.sitePackages}"
+    ];
+  });
 in
 {
   config = mkIf cfg.enable {
@@ -15,6 +24,17 @@ in
         enable = true;
         openFirewall = true; # 6052
         address = "0.0.0.0";
+        package = esphomeWithLittlefs;
+      };
+    };
+
+    # Add uv to the ESPHome service PATH so PlatformIO uses the Nix-provided
+    # binary instead of downloading its own (which would fail due to permissions).
+    # Also disable MemoryDenyWriteExecute so uv (a native Rust binary) can run.
+    systemd.services.esphome = {
+      path = [ pkgs.uv ];
+      serviceConfig = {
+        MemoryDenyWriteExecute = lib.mkForce false;
       };
     };
   };