nvidia-utils: Enable nvidia services as default in .install

The post_install will enable the services as default on first installation. This is an requirement for having sleep working on NVIDIa GPUs, specially on wayland.

post_upgrade will only enable the services once on upgrade for the upcoming version. This is intended that the user only gets in enabled once, to reflect our default behavior. If the user wants to disable them again, they want be forced to be installed.

Besides that we are removing some old comments, which are not revelant anymore.

Signed-off-by: Peter Jung <ptr1337@archlinux.org>

nvidia-utils.install

+post_install() {
+  # Enable NVIDIA Services at first installation
+  # The services are mandatory, see under systemd configuration
+  # https://download.nvidia.com/XFree86/Linux-x86_64/560.35.03/README/powermanagement.html#SystemdConfigur74e29
+  # This is also an requirement to have sleep working together with PreserveAllocations
+  # https://gitlab.archlinux.org/archlinux/packaging/packages/nvidia-utils/-/commit/55644f78820fd382fbdf283b1fd7f08e6b7c22d7
+  # https://gitlab.archlinux.org/archlinux/packaging/packages/nvidia-utils/-/merge_requests/16
+  systemctl enable nvidia-resume nvidia-hibernate nvidia-suspend
+}
+
 post_upgrade() {
-  echo "If you run into trouble with CUDA not being available, run nvidia-modprobe first."
-  echo "If you use GDM on Wayland, you might have to run systemctl enable --now nvidia-resume.service"
-  echo "If you use sleep on wayland, you might have to run systemctl enable nvidia-resume nvidia-hibernate nvidia-suspend"
+  # Only enable the services for the 560.35.03-16 version
+  # This avoids, that the services are automatically enabled in every upgrade
+  if (( $(vercmp $2 560.35.03-16) < 0)); then
+    for service in nvidia-resume nvidia-hibernate nvidia-suspend; do
+        if ! systemctl is-enabled --quiet $service; then
+            echo "Enabling $service..."
+            systemctl enable $service
+        fi
+    done
+  fi
 }
-# For the latter nore, see also https://gitlab.gnome.org/GNOME/gdm/-/issues/784
 
-post_install() {
-  post_upgrade
+post_remove() {
+  systemctl disable nvidia-resume nvidia-hibernate nvidia-suspend
 }