x11-drivers/nvidia-drivers: build driver against /lib/modules

There are two ways to build the nvidia-driver - either against a full kernel
source tree in /usr/src/linux, or against a slim kernel-devel equivalent in
/lib/modules/*/build. The /lib/modules/*/build is provided by
sys-kernel/coreos-module, see `install_build_source`. The interesting thing is
that in absence of --kernel-source-path, nvidia-installer will autodetect which
to use and already builds against /lib/modules/*/build on Flatcar right now. By
passing --kernel-name, we make that choice explicit and this allows us to skip
the emerge steps of the build.

Since this runs in the developer container, there is also no point in trying to
execute systemctl or depmod, so pass the flags to disable usage of those.

Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

sdk_container/src/third_party/coreos-overlay/x11-drivers/nvidia-drivers/files/bin/install-nvidia

@@ -2,17 +2,16 @@
 
 . /usr/share/coreos/release
 NVIDIA_DRIVER_BASENAME="$1"
-
-emerge-gitclone
-emerge -gKv coreos-sources > /dev/null
-cp "/usr/lib64/modules/$(ls /usr/lib64/modules)/build/.config" /usr/src/linux/
-make -C /usr/src/linux modules_prepare
+KERNEL_NAME="$(ls /lib/modules)"
 
 cd "/nvidia/${NVIDIA_DRIVER_BASENAME}"
 ./nvidia-installer -s -n \
   --no-check-for-alternate-installs \
   --no-kernel-module-source \
+  --kernel-name="${KERNEL_NAME}" \
   --no-opengl-files \
   --no-distro-scripts \
+  --no-systemd \
+  --skip-depmod \
   --kernel-install-path="${PWD}" \
   --log-file-name="${PWD}/nvidia-installer.log" || true