gnome3: only maintain single GNOME 3 package set (#29397)

* gnome3: only maintain single GNOME 3 package set

GNOME 3 was split into 3.10 and 3.12 in #2694. Unfortunately, we barely have the resources
to update a single version of GNOME. Maintaining multiple versions just does not make sense.
Additionally, it makes viewing history using most Git tools bothersome.

This commit renames `pkgs/desktops/gnome-3/3.24` to `pkgs/desktops/gnome-3`, removes
the config variable for choosing packageset (`environment.gnome3.packageSet`), updates
the hint in maintainer script, and removes the `gnome3_24` derivation from `all-packages.nix`.

Closes: #29329

* maintainers/scripts/gnome: Use fixed GNOME 3 directory

Since we now allow only a single GNOME 3 package set, specifying
the working directory is not necessary.

This commit sets the directory to `pkgs/desktops/gnome-3`.

2 files changed, 45 insertions, 0 deletions

diff --git a/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix b/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix
new file mode 100644
index 000000000000..3164e4dd74b1
--- /dev/null
+++ b/pkgs/desktops/gnome-3/core/gnome-system-monitor/default.nix
@@ -0,0 +1,35 @@
+{ stdenv, intltool, fetchurl, pkgconfig, gtkmm3, libxml2
+, bash, gtk3, glib, wrapGAppsHook
+, itstool, gnome3, librsvg, gdk_pixbuf, libgtop, systemd }:
+
+stdenv.mkDerivation rec {
+  inherit (import ./src.nix fetchurl) name src;
+
+  doCheck = true;
+
+  propagatedUserEnvPkgs = [ gnome3.gnome_themes_standard ];
+
+  buildInputs = [ bash pkgconfig gtk3 glib intltool itstool libxml2
+                  gtkmm3 libgtop wrapGAppsHook
+                  gdk_pixbuf gnome3.defaultIconTheme librsvg
+                  gnome3.gsettings_desktop_schemas systemd ];
+
+  preFixup = ''
+    gappsWrapperArgs+=(
+      --prefix XDG_DATA_DIRS : "${gtk3.out}/share:${gnome3.gnome_themes_standard}/share"
+    )
+  '';
+
+  # fails to build without --enable-static
+  configureFlags = ["--enable-systemd" "--enable-static"];
+
+  enableParallelBuilding = true;
+
+  meta = with stdenv.lib; {
+    homepage = https://help.gnome.org/users/gnome-system-monitor/3.12/;
+    description = "System Monitor shows you what programs are running and how much processor time, memory, and disk space are being used";
+    maintainers = gnome3.maintainers;
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/desktops/gnome-3/core/gnome-system-monitor/src.nix b/pkgs/desktops/gnome-3/core/gnome-system-monitor/src.nix
new file mode 100644
index 000000000000..aab373b9715b
--- /dev/null
+++ b/pkgs/desktops/gnome-3/core/gnome-system-monitor/src.nix
@@ -0,0 +1,10 @@
+# Autogenerated by maintainers/scripts/gnome.sh update
+
+fetchurl: {
+  name = "gnome-system-monitor-3.24.0";
+
+  src = fetchurl {
+    url = mirror://gnome/sources/gnome-system-monitor/3.24/gnome-system-monitor-3.24.0.tar.xz;
+    sha256 = "c32b45062411aaef06681e5e28fd2c24ea8b362168bae83992944ec8e02063f4";
+  };
+}