%global pkg wireguard

%global kernel_version_min 4.18.0-305.el8

# To pick a specific kernel use `--define "kernel_version 4.18.0-315.el8"`
# Otherwise the latest installed kernel-devel version later than
# %%{kernel_version_min} will be used.

%global kernel_version_latest %({ echo %{kernel_version_min}; rpm --query kernel-devel --queryformat '%%{VERSION}-%%{RELEASE}\\\n' | grep -v "package kernel-devel is not installed"; } | sort -V | sed -e '0,/^%{kernel_version_min}$/d' | tail -n 1)

%if "%{kernel_version_latest}" != ""
%{!?kernel_version:%{expand:%%global kernel_version %{kernel_version_latest}}}
%endif

%global _use_internal_dependency_generator 0
%global __find_requires %{nil}
%global __find_provides /usr/lib/rpm/find-provides

%global debug_package %{nil}

%global __spec_install_post \
  %{?__debug_package:%{__debug_install_post}} \
  %{__arch_install_post} \
  %{__os_install_post} \
  %{__mod_compress_install_post}

%global __mod_compress_install_post find %{buildroot}/lib/modules -type f -name \*.ko -exec xz \{\} \\;


Name:             kmod-%{pkg}
Version:          1.0.20210606
Release:          2%{?dist}
Summary:          Fast, modern, secure VPN tunnel

License:          GPLv2
URL:              https://www.wireguard.com/

Source0:          https://git.zx2c4.com/%{pkg}-linux-compat/snapshot/%{pkg}-linux-compat-%{version}.tar.xz

ExclusiveArch:    x86_64 aarch64

BuildRequires:    elfutils-libelf-devel
BuildRequires:    gcc
BuildRequires:    kmod
BuildRequires:    make
BuildRequires:    redhat-rpm-config
BuildRequires:    xz

%{!?kernel_version:
BuildRequires:    kernel-devel >= %{kernel_version_min}
}

%{?kernel_version:
BuildRequires:    kernel-devel = %{kernel_version}
BuildRequires:    kernel-devel-uname-r = %{kernel_version}.%{_arch}

Requires:         kernel-core = %{kernel_version}
Requires:         kernel-core-uname-r = %{kernel_version}.%{_arch}
Requires:         kernel-modules = %{kernel_version}
Requires:         kernel-modules-uname-r = %{kernel_version}.%{_arch}

Provides:         installonlypkg(kernel-module)
Provides:         %{name}-%{kernel_version}.%{_arch} = %{?epoch:%{epoch}:}%{version}-%{release}
}

Requires(post):   /usr/sbin/depmod
Requires(postun): /usr/sbin/depmod

Requires(post):   /usr/bin/dracut
Requires(postun): /usr/bin/dracut

Supplements:      wireguard-tools
Recommends:       wireguard-tools


%description
WireGuard is an extremely simple yet fast and modern VPN that utilizes
state-of-the-art cryptography. It aims to be faster, simpler, leaner, and more
useful than IPsec, while avoiding the massive headache. It intends to be
considerably more performant than OpenVPN. WireGuard is designed as a general
purpose VPN for running on embedded interfaces and super computers alike, fit
for many different circumstances.


%prep
%autosetup -p1 -n %{pkg}-linux-compat-%{version}


%build
pushd src
%{__make} -C /usr/src/kernels/%{kernel_version}.%{_arch} %{?_smp_mflags} M=$PWD modules
popd


%install
%{__install} -D -t %{buildroot}/lib/modules/%{kernel_version}.%{_arch}/extra/drivers/net/%{pkg} src/%{pkg}.ko

# Make .ko objects temporarily executable for automatic stripping
find %{buildroot}/lib/modules -type f -name \*.ko -exec chmod u+x \{\} \+


%clean
%{__rm} -rf %{buildroot}


%post
mkdir -p %{_localstatedir}/lib/rpm-state/sig-kmods
touch %{_localstatedir}/lib/rpm-state/sig-kmods/%{kernel_version}.%{_arch}


%preun
mkdir -p %{_localstatedir}/lib/rpm-state/sig-kmods
touch %{_localstatedir}/lib/rpm-state/sig-kmods/%{kernel_version}.%{_arch}


%postun
if [ -f %{_localstatedir}/lib/rpm-state/sig-kmods/%{kernel_version}.%{_arch} ]
then
    if [ -f /lib/modules/%{kernel_version}.%{_arch}/System.map ]
    then
        /usr/sbin/depmod -aeF /lib/modules/%{kernel_version}.%{_arch}/System.map %{kernel_version}.%{_arch}
    fi

    if [ -f /boot/initramfs-%{kernel_version}.%{_arch}.img ]
    then
        if /usr/bin/dracut -f --rebuild /boot/initramfs-%{kernel_version}.%{_arch}.img /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew %{kernel_version}.%{_arch}
        then
            if ! cmp -s /boot/initramfs-%{kernel_version}.%{_arch}.img /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew
            then
                mv /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew /boot/initramfs-%{kernel_version}.%{_arch}.img
            else
                rm -f /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew
            fi
        fi
    fi

    rm -f %{_localstatedir}/lib/rpm-state/sig-kmods/%{kernel_version}.%{_arch}
    rmdir --ignore-fail-on-non-empty %{_localstatedir}/lib/rpm-state/sig-kmods
fi


%posttrans
if [ -f %{_localstatedir}/lib/rpm-state/sig-kmods/%{kernel_version}.%{_arch} ]
then
    if [ -f /lib/modules/%{kernel_version}.%{_arch}/System.map ]
    then
        /usr/sbin/depmod -aeF /lib/modules/%{kernel_version}.%{_arch}/System.map %{kernel_version}.%{_arch}
    fi

    if [ -f /boot/initramfs-%{kernel_version}.%{_arch}.img ]
    then
        if /usr/bin/dracut -f --rebuild /boot/initramfs-%{kernel_version}.%{_arch}.img /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew %{kernel_version}.%{_arch}
        then
            if ! cmp -s /boot/initramfs-%{kernel_version}.%{_arch}.img /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew
            then
                mv /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew /boot/initramfs-%{kernel_version}.%{_arch}.img
            else
                rm -f /boot/initramfs-%{kernel_version}.%{_arch}.img.rpmnew
            fi
        fi
    fi

    rm -f %{_localstatedir}/lib/rpm-state/sig-kmods/%{kernel_version}.%{_arch}
    rmdir --ignore-fail-on-non-empty %{_localstatedir}/lib/rpm-state/sig-kmods
fi


%files
%defattr(644,root,root,755)
/lib/modules/%{kernel_version}.%{_arch}
%license COPYING
%doc README.md


%changelog
* Wed Aug 11 2021 Peter Georg <peter.georg@physik.uni-regensburg.de> - 1.0.20210606-2
- Initial version