cups-drv-rastertosag-gdi (cups driver): gzip ppd files

ppd files are gzipped to save some space.
The `gzip` "-n" option prevents gzip from storing
a timestamp, thus facilitating reproducibility.

nixos/doc/manual/from_md/release-notes/rl-2211.section.xml

@@ -643,6 +643,15 @@
           maintainer to update the package.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          ppd files in <literal>pkgs.cups-drv-rastertosag-gdi</literal>
+          are now gzipped. If you refer to such a ppd file with its path
+          (e.g. via
+          <link xlink:href="options.html#opt-hardware.printers.ensurePrinters">hardware.printers.ensurePrinters</link>)
+          you will need to append <literal>.gz</literal> to the path.
+        </para>
+      </listitem>
       <listitem>
         <para>
           xow package removed along with the

nixos/doc/manual/release-notes/rl-2211.section.md

@@ -210,6 +210,8 @@ Available as [services.patroni](options.html#opt-services.patroni.enable).
 
 - riak package removed along with `services.riak` module, due to lack of maintainer to update the package.
 
+- ppd files in `pkgs.cups-drv-rastertosag-gdi` are now gzipped.  If you refer to such a ppd file with its path (e.g. via [hardware.printers.ensurePrinters](options.html#opt-hardware.printers.ensurePrinters)) you will need to append `.gz` to the path.
+
 - xow package removed along with the `hardware.xow` module, due to the project being deprecated in favor of `xone`,  which is available via the `hardware.xone` module.
 
 - dd-agent package removed along with the `services.dd-agent` module, due to the project being deprecated in favor of `datadog-agent`,  which is available via the `services.datadog-agent` module.

pkgs/misc/cups/drivers/cups-drv-rastertosag-gdi/default.nix

@@ -35,6 +35,9 @@ python3Packages.buildPythonApplication rec {
     ln -vst "${placeholder "out"}/lib/cups/filter/" "${placeholder "out"}/bin/rastertosag-gdi"
     runHook postInstall
   '';
+  postFixup = ''
+    gzip -9nv "${placeholder "out"}/share/cups/model/rastertosag-gdi"/*.ppd
+  '';
   meta = {
     description = "CUPS driver for Ricoh Aficio SP 1000S and SP 1100S printers";
     downloadPage = "https://www.openprinting.org/download/printing/rastertosag-gdi/";