cockpit: add branding, fix app visibility conditions, add andre4ik3 as maintainer

pkgs/by-name/co/cockpit/branding.css

···
+#badge {
+    inline-size: 225px;
+    block-size: 80px;
+    background-image: url("logo.png");
+    background-size: contain;
+    background-repeat: no-repeat;
+}
+
+#brand::before {
+    content: "${PRETTY_NAME}";
+}

pkgs/by-name/co/cockpit/package.nix

···
   systemd,
   udev,
   xmlto,
+  # Enables lightweight NixOS branding, replacing the default Cockpit icons
+  withBranding ? true,
+  nixos-icons,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
···
 
     # hardcode libexecdir, I am assuming that cockpit only use it to find it's binaries
     printf 'def get_libexecdir() -> str:\n\treturn "%s"' "$out/libexec" >> src/cockpit/packages.py
+
+    # patch paths used as visibility conditions in apps
+    substituteInPlace pkg/*/manifest.json \
+      --replace-warn '"/usr/bin' '"/run/current-system/sw/bin' \
+      --replace-warn '"/usr/sbin' '"/run/current-system/sw/bin' \
+      --replace-warn '"/usr/share' '"/run/current-system/sw/share' \
+      --replace-warn '"/lib/systemd' '"/run/current-system/sw/lib/systemd'
+
+    # replace reference to system python interpreter, used for e.g. sosreport
+    substituteInPlace pkg/lib/python.ts \
+      --replace-fail /usr/libexec/platform-python ${python3Packages.python.interpreter}
   '';
 
   configureFlags = [
···
     substituteInPlace $out/lib/systemd/*/* \
       --replace-warn /bin /run/current-system/sw/bin
 
+    ${lib.optionalString withBranding ''
+      mkdir -p "$out/share/cockpit/branding/nixos"
+      pushd "$out/share/cockpit/branding/nixos"
+
+      icons="${nixos-icons}/share/icons/hicolor"
+      ln -s "$icons/16x16/apps/nix-snowflake.png" favicon.ico
+      ln -s "$icons/256x256/apps/nix-snowflake.png" logo.png
+      ln -s "$icons/256x256/apps/nix-snowflake.png" apple-touch-icon.png
+      cp "${./branding.css}" branding.css
+
+      popd
+    ''}
+
     runHook postFixup
   '';
 
···
     export G_MESSAGES_DEBUG=cockpit-ws,cockpit-wrapper,cockpit-bridge
     export PATH=$PATH:$(pwd)
 
-    make check  -j$NIX_BUILD_CORES || true
+    make check -j$NIX_BUILD_CORES || true
     npm run eslint
     npm run stylelint
   '';
···
     homepage = "https://cockpit-project.org/";
     changelog = "https://cockpit-project.org/blog/cockpit-${finalAttrs.version}.html";
     license = lib.licenses.lgpl21;
-    maintainers = [ lib.maintainers.lucasew ];
+    maintainers = with lib.maintainers; [
+      lucasew
+      andre4ik3
+    ];
   };
 })