1 files changed, 57 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/desktops/gnome/extensions/buildGnomeExtension.nix b/nixpkgs/pkgs/desktops/gnome/extensions/buildGnomeExtension.nix
new file mode 100644
index 000000000000..3be7f5c8789a
--- /dev/null
+++ b/nixpkgs/pkgs/desktops/gnome/extensions/buildGnomeExtension.nix
@@ -0,0 +1,57 @@
+{ pkgs, lib, stdenv, fetchzip }:
+
+let
+
+  buildGnomeExtension = {
+    # Every gnome extension has a UUID. It's the name of the extension folder once unpacked
+    # and can always be found in the metadata.json of every extension.
+    uuid,
+    name,
+    pname,
+    description,
+    # extensions.gnome.org extension URL
+    link,
+    # Extension version numbers are integers
+    version,
+    sha256,
+    # Hex-encoded string of JSON bytes
+    metadata,
+  }:
+
+  stdenv.mkDerivation {
+    pname = "gnome-shell-extension-${pname}";
+    version = builtins.toString version;
+    src = fetchzip {
+      url = "https://extensions.gnome.org/extension-data/${
+          builtins.replaceStrings [ "@" ] [ "" ] uuid
+        }.v${builtins.toString version}.shell-extension.zip";
+      inherit sha256;
+      stripRoot = false;
+      # The download URL may change content over time. This is because the
+      # metadata.json is automatically generated, and parts of it can be changed
+      # without making a new release. We simply substitute the possibly changed fields
+      # with their content from when we last updated, and thus get a deterministic output
+      # hash.
+      extraPostFetch = ''
+        echo "${metadata}" | base64 --decode > $out/metadata.json
+      '';
+    };
+    buildCommand = ''
+      mkdir -p $out/share/gnome-shell/extensions/
+      cp -r -T $src $out/share/gnome-shell/extensions/${uuid}
+    '';
+    meta = {
+      description = builtins.head (lib.splitString "\n" description);
+      longDescription = description;
+      homepage = link;
+      license = lib.licenses.gpl2Plus; # https://wiki.gnome.org/Projects/GnomeShell/Extensions/Review#Licensing
+      maintainers = with lib.maintainers; [ piegames ];
+    };
+    passthru = {
+      extensionPortalSlug = pname;
+      # Store the extension's UUID, because we might need it at some places
+      extensionUuid = uuid;
+    };
+  };
+in
+  lib.makeOverridable buildGnomeExtension