skawarePackages: add passthru.updateScript

pkgs/development/skaware-packages/build-skaware-man-pages.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromSourcehut,
+  nix-update-script,
 }:
 
 {
@@ -41,6 +42,13 @@ stdenv.mkDerivation {
 
   dontBuild = true;
 
+  passthru.updateScript = nix-update-script {
+    extraArgs = [
+      "--override-filename"
+      "pkgs/development/skaware-packages/${lib.removeSuffix "-man-pages" pname}/default.nix"
+    ];
+  };
+
   meta = with lib; {
     inherit description license maintainers;
     inherit (src.meta) homepage;

pkgs/development/skaware-packages/build-skaware-package.nix

@@ -3,6 +3,7 @@
   stdenv,
   cleanPackaging,
   fetchurl,
+  nix-update-script,
 }:
 {
   # : string
@@ -148,7 +149,19 @@ stdenv.mkDerivation {
     ${cleanPackaging.checkForRemainingFiles}
   '';
 
-  passthru = passthru // (if manpages == null then { } else { inherit manpages; });
+  passthru =
+    {
+      updateScript = nix-update-script {
+        extraArgs = [
+          "--url"
+          "https://github.com/skarnet/${pname}"
+          "--override-filename"
+          "pkgs/development/skaware-packages/${pname}/default.nix"
+        ];
+      };
+    }
+    // passthru
+    // (if manpages == null then { } else { inherit manpages; });
 
   meta = {
     homepage = "https://skarnet.org/software/${pname}/";