Use version variable, add build.sh, update instructions

Signed-off-by: Kevin Mittman <kmittman@nvidia.com>

README.md

@@ -18,6 +18,8 @@ The `main` branch contains this README and a sample build script. The `.spec` an
 - [Prerequisites](#Prerequisites)
   * [Clone this git repository](#Clone-this-git-repository)
   * [Install build dependencies](#Install-build-dependencies)
+- [Building with script](#Building-with-script)
+- [Building Manually](#Building-Manually)
 - [Related](#Other-NVIDIA-driver-packages)
   * [Precompiled kernel modules](#Precompiled-kernel-modules)
   * [NVIDIA driver](#NVIDIA-driver)
@@ -92,6 +94,52 @@ git clone -b ${branch} https://github.com/NVIDIA/yum-packaging-dkms-nvidia
 yum install rpm-build dkms
 ```
 
+
+## Building with script
+
+### Fetch script from `main` branch
+
+```shell
+cd yum-packaging-dkms-nvidia
+git checkout remotes/origin/main -- build.sh
+```
+
+### Usage
+
+```shell
+./build.sh path/to/*.run
+> ex: time ./build.sh ~/Downloads/NVIDIA-Linux-x86_64-450.102.04.run
+```
+
+
+## Building Manually
+
+### Generate tarball from runfile
+
+```shell
+version="450.102.04"
+sh NVIDIA-Linux-x86_64-${version}.run --extract-only --target extract
+mkdir nvidia-kmod-${version}-x86_64
+mv extract/kernel nvidia-kmod-${version}-x86_64/
+tar -cJf nvidia-kmod-${version}-x86_64.tar.xz nvidia-kmod-${version}-x86_64
+```
+
+### Packaging
+
+```shell
+mkdir BUILD BUILDROOT RPMS SRPMS SOURCES SPECS
+cp dkms-nvidia.conf SOURCES/
+cp nvidia-kmod-${version}-x86_64.tar.xz SOURCES/
+cp dkms-nvidia.spec SPECS/
+
+rpmbuild \
+    --define "%_topdir $(pwd)" \
+    --define "debug_package %{nil}" \
+    --define "version $version" \
+    --define "epoch 3" \
+    -v -bb SPECS/dkms-nvidia.spec
+```
+
 ## Related
 
 ### Precompiled kernel modules

build.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+
+runfile="$1"
+topdir="$HOME/dkms-nvidia"
+arch="x86_64"
+epoch="3"
+
+drvname=$(basename "$runfile")
+version=$(echo "$drvname" | sed -e "s|NVIDIA\-Linux\-${arch}\-||" -e 's|\.run$||')
+
+tarball=nvidia-kmod-${version}-${arch}
+unpackDir="unpack"
+
+err() { echo; echo "ERROR: $*"; exit 1; }
+kmd() { echo; echo ">>> $*" | fold -s; eval "$*" || err "at line \`$*\`"; }
+
+generate_tarballs()
+{
+    mkdir "${tarball}"
+    sh "${runfile}" --extract-only --target ${unpackDir}
+    mv "${unpackDir}/kernel" "${tarball}/"
+    rm -rf ${unpackDir}
+    tar --remove-files -cJf "${tarball}.tar.xz" "${tarball}"
+}
+
+build_rpm()
+{
+    mkdir -p "$topdir"
+    (cd "$topdir" && mkdir -p BUILD BUILDROOT RPMS SRPMS SOURCES SPECS)
+
+    cp -v -- *conf* "$topdir/SOURCES/"
+    cp -v -- *tar* "$topdir/SOURCES/"
+    cp -v -- *.spec "$topdir/SPECS/"
+    cd "$topdir" || err "Unable to cd into $topdir"
+
+    kmd rpmbuild \
+        --define "'%_topdir $(pwd)'" \
+        --define "'debug_package %{nil}'" \
+        --define "'version $version'" \
+        --define "'epoch $epoch'" \
+        -v -bb SPECS/dkms-nvidia.spec
+
+    cd - || err "Unable to cd into $OLDPWD"
+}
+
+# Create tarball from runfile contents
+if [[ -f ${tarball}.tar.xz ]]; then
+    echo "[SKIP] generate_tarballs()"
+else
+    echo "==> generate_tarballs()"
+    generate_tarballs
+fi
+
+# Build RPMs
+empty=$(find "$topdir/RPMS" -maxdepth 0 -type d -empty 2>/dev/null)
+found=$(find "$topdir/RPMS" -mindepth 2 -maxdepth 2 -type f -name "*${version}*" 2>/dev/null)
+if [[ ! -d "$topdir/RPMS" ]] || [[ $empty ]] || [[ ! $found ]]; then
+    echo "==> build_rpm(${version})"
+    build_rpm
+else
+    echo "[SKIP] build_rpm(${version})"
+fi
+
+echo "---"
+find "$topdir/RPMS" -mindepth 2 -maxdepth 2 -type f -name "*${version}*"

dkms-nvidia.spec

@@ -2,7 +2,7 @@
 %global dkms_name nvidia
 
 Name:           kmod-%{dkms_name}-latest-dkms
-Version:        430.14
+Version:        %{?version}%{?!version:430.14}
 Release:        1%{?dist}
 Summary:        NVIDIA display driver kernel module
 Epoch:          3