Add fallback for open module src

Source code for the Vulkan Beta drivers are only uploaded to the github mirror and not the NVIDIA tarball repository.
The fallback is being added so users can still build vulkan beta open kernel modules, but we're going to use the NV tarball repo as our main since it's faster on new stable (and maybe beta?) releases.

PKGBUILD

@@ -169,7 +169,7 @@ if [ -e options ]; then
   source options
   if [ "$_open_source_modules" != "false" ]; then
     # Open source kernel module availability check
-    if [[ "$( curl -Is "https://download.nvidia.com/XFree86/NVIDIA-kernel-module-source/NVIDIA-kernel-module-source-$_driver_version.tar.xz" | head -n 1 )" = *200* ]]; then
+    if [[ "$( curl -Is "https://download.nvidia.com/XFree86/NVIDIA-kernel-module-source/NVIDIA-kernel-module-source-$_driver_version.tar.xz" | head -n 1 )" = *200* ]] || [[ "$( curl -Is "https://github.com/NVIDIA/open-gpu-kernel-modules/archive/refs/tags/$_driver_version.tar.gz" | head -n 1 )" = *302* ]]; then
       if [ -z "$_open_source_modules" ]; then
         msg2 " - Open source kernel modules available - "
         warning "IT ONLY OFFERS SUPPORT FOR TURING AND NEWER, AND DOESN'T OFFER ALL THE FEATURES OF THE PROPRIETARY ONE."
@@ -181,6 +181,11 @@ if [ -e options ]; then
         else
           echo '_open_source_modules="false"' >> options
         fi
+        if [[ "$( curl -Is "https://download.nvidia.com/XFree86/NVIDIA-kernel-module-source/NVIDIA-kernel-module-source-$_driver_version.tar.xz" | head -n 1 )" = *200* ]]; then
+          echo '_srcbase="NVIDIA-kernel-module-source"' >> options
+        elif [[ "$( curl -Is "https://github.com/NVIDIA/open-gpu-kernel-modules/archive/refs/tags/$_driver_version.tar.gz" | head -n 1 )" = *302* ]]; then
+          echo '_srcbase="open-gpu-kernel-modules"' >> options
+        fi
       fi
     else
       msg2 "No open source kernel module available"
@@ -416,7 +421,11 @@ md5sums=("$_md5sum"
          'd11cb3bd76ab61a0f086aea9a0c53087')
 
 if [ "$_open_source_modules" = "true" ]; then
-  source+=("NVIDIA-kernel-module-source-$pkgver.tar.xz::https://download.nvidia.com/XFree86/NVIDIA-kernel-module-source/NVIDIA-kernel-module-source-${pkgver}.tar.xz")
+  if [[ "$_srcbase" == "NVIDIA-kernel-module-source" ]]; then
+    source+=("NVIDIA-kernel-module-source-$pkgver.tar.xz::https://download.nvidia.com/XFree86/NVIDIA-kernel-module-source/NVIDIA-kernel-module-source-${pkgver}.tar.xz")
+  elif [[ "$_srcbase" == "open-gpu-kernel-modules" ]]; then
+    source+=("$pkgname-$pkgver.tar.gz::https://github.com/NVIDIA/open-gpu-kernel-modules/archive/refs/tags/${pkgver}.tar.gz")
+  fi
   md5sums+=("SKIP")
 fi
 
@@ -472,7 +481,7 @@ prepare() {
   sh "$_pkg".run -x
 
   if [ "$_open_source_modules" = "true" ]; then
-    cd NVIDIA-kernel-module-source-${pkgver}
+    cd ${_srcbase}-${pkgver}
 
     # Fix for https://bugs.archlinux.org/task/74886
     if (( ${pkgver%%.*} < 525 )); then
@@ -506,7 +515,7 @@ BUILT_MODULE_LOCATION[4]="kernel-open"\
 DEST_MODULE_LOCATION[4]="/kernel/drivers/video"' kernel-open/dkms.conf
 
     # Clean version for later copying for DKMS
-    cp -r ../NVIDIA-kernel-module-source-${pkgver} "$srcdir"/open-gpu-kernel-modules-dkms
+    cp -r ../${_srcbase}-${pkgver} "$srcdir"/open-gpu-kernel-modules-dkms
   else
     cd "$_pkg"
 
@@ -1394,7 +1403,7 @@ build() {
       done
     fi
   else
-    cd NVIDIA-kernel-module-source-${pkgver}
+    cd ${_srcbase}-${pkgver}
     make SYSSRC="/usr/src/linux"
   fi
 }
@@ -1772,7 +1781,7 @@ if [ "$_dkms" = "false" ] || [ "$_dkms" = "full" ]; then
       conflicts=('NVIDIA-MODULE')
       provides=('NVIDIA-MODULE')
 
-      cd NVIDIA-kernel-module-source-${pkgver}
+      cd ${_srcbase}-${pkgver}
       _extradir="/usr/lib/modules/$(</usr/src/linux/version)/extramodules"
       install -Dt "${pkgdir}${_extradir}" -m644 kernel-open/*.ko
       find "${pkgdir}" -name '*.ko' -exec strip --strip-debug {} +
@@ -1948,7 +1957,7 @@ if [ "$_dkms" = "true" ] || [ "$_dkms" = "full" ]; then
       mkdir -p "$pkgdir"/usr/lib/modprobe.d
       echo "options nvidia NVreg_OpenRmEnableUnsupportedGpus=1" > "$pkgdir"/usr/lib/modprobe.d/nvidia-open.conf
 
-      install -Dm644 NVIDIA-kernel-module-source-${pkgver}/COPYING "$pkgdir"/usr/share/licenses/$pkgname
+      install -Dm644 ${_srcbase}-${pkgver}/COPYING "$pkgdir"/usr/share/licenses/$pkgname
   else
 
       pkgdesc="NVIDIA kernel module sources (DKMS)"