nextcloud: initial skeleton directory derivation

for English and German

modules/nextcloud/default.nix

@@ -92,7 +92,7 @@
 
       auth.bruteforce.protection.enabled = true;
       trashbin_retention_obligation = "auto,7";
-      skeletondirectory = "/var/lib/nextcloud/skeleton/{lang}";
+      skeletondirectory = "${pkgs.nextcloud-skeleton}/{lang}";
       defaultapp = "file";
       activity_expire_days = "14";
       integrity.check.disabled = false;

overlays/default.nix

@@ -17,6 +17,7 @@
                 element-stickerpicker = prev.callPackage ./pkgs/element-stickerpicker {
                   inherit (inputs) element-stickers maunium-stickerpicker;
                 };
+                nextcloud-skeleton = prev.callPackage ./pkgs/nextcloud-skeleton { };
               }
             )
           ];

overlays/pkgs/nextcloud-skeleton/default.nix

@@ -0,0 +1,32 @@
+# Based on:
+# https://nix.dev/tutorials/working-with-local-files.html#union-explicitly-include-files
+{
+  stdenvNoCC,
+  lib,
+}:
+let
+  fs = lib.fileset;
+  sourceFiles = fs.unions [
+    ./en/Documents/Example.odt
+    ./en/Pictures/pubsolar.png
+    ./en/Pictures/pubsolar.svg
+    ./en/Readme.md
+    ./de/Dokumente/Beispiel.odt
+    ./de/Fotos/pubsolar.png
+    ./de/Fotos/pubsolar.svg
+    ./de/Liesmich.md
+  ];
+in
+
+fs.trace sourceFiles
+
+stdenvNoCC.mkDerivation {
+  name = "nextcloud-skeleton";
+  src = fs.toSource {
+    root = ./.;
+    fileset = sourceFiles;
+  };
+  postInstall = ''
+    cp -vr . $out
+  '';
+}