Wrap ZFS CachyOS update script as flake app to workaround missing PATH

.github/workflows/auto-update.yml

@@ -66,9 +66,7 @@ jobs:
         run: |
           export TMPDIR=/nix/tmpdir
           nix flake update
-
-          chmod +x zfs-cachyos/update.py
-          zfs-cachyos/update.py
+          nix run .#update-zfs-cachyos
 
       - name: Commit back to repository
         uses: stefanzweifel/git-auto-commit-action@v7

flake.nix

@@ -68,6 +68,25 @@
             # Packages only contain linux-cachyos-* due to Flake schema requirements
             packages = lib.filterAttrs (_: lib.isDerivation) legacyPackages;
 
+            apps.update-zfs-cachyos = {
+              type = "app";
+              program =
+                let
+                  python = pkgs.python3.withPackages (ps: [ ps.requests ]);
+                  script = pkgs.writeShellApplication {
+                    name = "update-zfs-cachyos";
+                    runtimeInputs = [
+                      python
+                      pkgs.nix-prefetch-git
+                    ];
+                    text = ''
+                      python3 ${./zfs-cachyos/update.py}
+                    '';
+                  };
+                in
+                lib.getExe script;
+            };
+
             # Allow build unfree modules such as nvidia_x11
             _module.args.pkgs = lib.mkForce (
               import inputs.nixpkgs {

zfs-cachyos/update.py

@@ -99,8 +99,14 @@ def main() -> int:
         print("nix-prefetch-git execution failed, exiting")
         return 1
 
-    script_dir = Path(__file__).parent
-    output_file = script_dir / "version.json"
+    current = Path.cwd()
+    while not (current / "flake.lock").exists():
+        if current == current.parent:
+            print("Could not find flake.lock in any parent directory, exiting")
+            return 1
+        current = current.parent
+
+    output_file = current / "zfs-cachyos" / "version.json"
 
     save_version_info(latest_branch, prefetch_data, output_file)