%global commit                  36c3e1cb1ac054761e6ff726d374fde770ab790b
%global gittag                  8.1.0.4
%global shortcommit             %(c=%{commit}; echo ${c:0:7})
%define spec_release            1

%define kmod_name		kvdo
%define kmod_driver_version	%{gittag}
%define kmod_rpm_release	%{spec_release}
%define kmod_kernel_version	5.12.0-1.el9
%define kmod_headers_version	%(rpm -qa kernel-devel | sed 's/^kernel-devel-//')
%define kmod_kbuild_dir		.
%define kmod_devel_package	0

Source0:	https://github.com/dm-vdo/%{kmod_name}/archive/%{commit}/%{kmod_name}-%{shortcommit}.tar.gz

%define findpat %( echo "%""P" )

Name:		kmod-kvdo
Version:	%{kmod_driver_version}
Release:	%{kmod_rpm_release}%{?dist}
Summary:	Kernel Modules for Virtual Data Optimizer
License:	GPLv2+
URL:		http://github.com/dm-vdo/kvdo
BuildRoot:	%(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)
BuildRequires:  elfutils-libelf-devel
BuildRequires:	glibc
BuildRequires:	kernel-devel >= %{kmod_kernel_version}

# Disable the kernel-debug requirement for now

BuildRequires:  libuuid-devel
BuildRequires:  redhat-rpm-config
ExcludeArch:    i686
ExcludeArch:    ppc
ExcludeArch:    ppc64
ExcludeArch:    s390

%global kernel_source() /usr/src/kernels/%{kmod_headers_version}

%global _use_internal_dependency_generator 0
Provides:         kernel-modules = %{kmod_kernel_version}.%{_target_cpu}
Provides:         kmod-%{kmod_name} = %{?epoch:%{epoch}:}%{version}-%{release}
Requires(post):   %{_sbindir}/weak-modules
Requires(postun): %{_sbindir}/weak-modules
Requires:         kernel >= %{kmod_kernel_version}
Requires:         kernel-core-uname-r >= %{kmod_kernel_version}

%description
Virtual Data Optimizer (VDO) is a device mapper target that delivers
block-level deduplication, compression, and thin provisioning.

This package provides the kernel modules for VDO.

%pre
# During the install, check whether kvdo or uds is loaded.  A warning here
# indicates that a previous install was not completely removed.  This message
# is purely informational to the user.
for module in kvdo uds; do
  if grep -q "^${module}" /proc/modules; then
    if [ "${module}" == "kvdo" ]; then
      echo "WARNING: Found ${module} module previously loaded (Version: $(cat /sys/kvdo/version 2>/dev/null || echo Unknown)).  A reboot is recommended before attempting to use the newly installed module."
    else
      echo "WARNING: Found ${module} module previously loaded.  A reboot is recommended before attempting to use the newly installed module."
    fi
  fi
done

%post
modules=( $(find /lib/modules/%{kmod_headers_version}/extra/kmod-%{kmod_name} | grep '\.ko$') )
printf '%s\n' "${modules[@]}" >> /var/lib/rpm-kmod-posttrans-weak-modules-add

%pretrans -p <lua>
posix.unlink("/var/lib/rpm-kmod-posttrans-weak-modules-add")

%posttrans
if [ -f "/var/lib/rpm-kmod-posttrans-weak-modules-add" ]; then
	modules=( $(cat /var/lib/rpm-kmod-posttrans-weak-modules-add) )
	rm -rf /var/lib/rpm-kmod-posttrans-weak-modules-add
	printf '%s\n' "${modules[@]}" | %{_sbindir}/weak-modules --dracut=/usr/bin/dracut --add-modules
fi

%preun
rpm -ql kmod-kvdo-%{kmod_driver_version}-%{kmod_rpm_release}%{?dist}.$(arch) | grep '\.ko$' > /var/run/rpm-kmod-%{kmod_name}-modules
# Check whether kvdo or uds is loaded, and if so attempt to remove it.  A
# failure to unload means there is still something using the module.  To make
# sure the user is aware, we print a warning with recommended instructions.
for module in kvdo uds; do
  if grep -q "^${module}" /proc/modules; then
    warnMessage="WARNING: ${module} in use.  Changes will take effect after a reboot."
    modprobe -r ${module} 2>/dev/null || echo ${warnMessage} && /usr/bin/true
  fi
done

%postun
modules=( $(cat /var/run/rpm-kmod-%{kmod_name}-modules) )
rm /var/run/rpm-kmod-%{kmod_name}-modules
printf '%s\n' "${modules[@]}" | %{_sbindir}/weak-modules --dracut=/usr/bin/dracut --remove-modules

%files
%defattr(644,root,root,755)
/lib/modules/%{kmod_headers_version}
/etc/depmod.d/%{kmod_name}.conf
/usr/share/doc/kmod-%{kmod_name}/greylist.txt

%prep
%setup -n %{kmod_name}-%{commit}
%{nil}
set -- *
mkdir source
mv "$@" source/
mkdir obj

%build
rm -rf obj
cp -r source obj
make -C %{kernel_source} M=$PWD/obj/%{kmod_kbuild_dir} V=1 \
	NOSTDINC_FLAGS="-I $PWD/obj/include -I $PWD/obj/include/uapi"
# mark modules executable so that strip-to-file can strip them
find obj/%{kmod_kbuild_dir} -name "*.ko" -type f -exec chmod u+x '{}' +

whitelist="/lib/modules/kabi-current/kabi_whitelist_%{_target_cpu}"

for modules in $( find obj/%{kmod_kbuild_dir} -name "*.ko" -type f -printf "%{findpat}\n" | sed 's|\.ko$||' | sort -u ) ; do
	# update depmod.conf
	module_weak_path=$(echo $modules | sed 's/[\/]*[^\/]*$//')
	if [ -z "$module_weak_path" ]; then
		module_weak_path=%{name}
	else
		module_weak_path=%{name}/$module_weak_path
	fi
	echo "override $(echo $modules | sed 's/.*\///') $(echo %{kmod_headers_version} | sed 's/\.[^\.]*$//').* weak-updates/$module_weak_path" >> source/depmod.conf

	# update greylist
	nm -u obj/%{kmod_kbuild_dir}/$modules.ko | sed 's/.*U //' |  sed 's/^\.//' | sort -u | while read -r symbol; do
		grep -q "^\s*$symbol\$" $whitelist || echo "$symbol" >> source/greylist
	done
done
sort -u source/greylist | uniq > source/greylist.txt

%install
export INSTALL_MOD_PATH=$RPM_BUILD_ROOT
export INSTALL_MOD_DIR=extra/%{name}
make -C %{kernel_source} modules_install V=1 \
	M=$PWD/obj/%{kmod_kbuild_dir}
# Cleanup unnecessary kernel-generated module dependency files.
find $INSTALL_MOD_PATH/lib/modules -iname 'modules.*' -exec rm {} \;

install -m 644 -D source/depmod.conf $RPM_BUILD_ROOT/etc/depmod.d/%{kmod_name}.conf
install -m 644 -D source/greylist.txt $RPM_BUILD_ROOT/usr/share/doc/kmod-%{kmod_name}/greylist.txt

%clean
rm -rf $RPM_BUILD_ROOT

%changelog
* Tue May 04 2021 - Andy Walsh <awalsh@redhat.com> - 8.1.0.4-1
- Initial build for EL9
- Related: rhbz#1955374