%global KVERREL %{version}-%{release}.%{_target_cpu}

# disable the '-debug{info,source}' pkgs
%define debug_package %{nil}
# also disable packaging files in '/usr/lib/.build-id/'
%define _build_id_links none

Name: kernel-%{kname}-tfg
Summary: The Linux Kernel
License: GPL
URL: https://www.kernel.org
Provides: kernel-%{kname}-tfg = %{KVERREL}
BuildRequires: bc binutils bison dwarves
BuildRequires: elfutils-libelf-devel flex
BuildRequires: make openssl openssl-devel perl python3 rsync
BuildRequires: clang lld llvm llvm-devel
BuildRequires: opencsd-devel
BuildRequires: kmod
BuildRequires: /usr/bin/pathfix.py
Requires: coreutils systemd dracut
Requires: /usr/bin/kernel-install
Requires: /usr/sbin/installkernel
Requires: linux-firmware

%ifarch aarch64
%global build_arch arm64
%global make_targets olddefconfig Image.gz modules dtbs
%endif

%ifarch riscv64
%global build_arch riscv64
%global make_targets olddefconfig Image.gz modules dtbs
%endif

%global make make -j$(( $(nproc) + 2 )) KERNELRELEASE=%{KVERREL}

Source2: https://git.resf.org/thefossguy/kernel-tfg/archive/master.tar.gz
Source3: config

%description
The Linux Kernel, the operating system core itself

%package headers
Summary: Header files for the Linux kernel for use by glibc
Obsoletes: kernel-%{kname}-headers-tfg
Provides: kernel-%{kname}-headers-tfg = %{KVERREL}
%description headers
Kernel-headers includes the C header files that specify the interface
between the Linux kernel and userspace libraries and programs.  The
header files define structures and constants that are needed for
building most standard programs and are also needed for rebuilding the
glibc package

%package devel
Summary: Development package for building kernel modules to match the kernel
Provides: kernel-%{kname}-devel-tfg = %{KVERREL}
AutoReqProv: no
%description devel
This package provides kernel headers and makefiles sufficient to build modules
against the kernel package.

%prep
if [ -f ../SOURCES/linux-%{version}.tar.sign ]; then
    [ -f ../SOURCES/linux-%{version}.tar ] || gzip --decompress --keep %{SOURCE0}
    gpg2 --locate-keys torvalds@kernel.org gregkh@kernel.org
    gpg2 --verify %{SOURCE99} || exit 1

    # not needed anymore, might as well delete it to make space for the
    # build and install phases
    rm -vf linux-%{version}.tar
fi
%setup -q -n %{src_dir}
find ../../SOURCES -type f -name "patch-*.patch" -print0 | sort -z | xargs --no-run-if-empty -t -0 -n 1 patch -p1 -i

# Mangle all Python shebangs to be Python 3 explicitly.
# -i specifies the interpreter for the shebang
# -n prevents creating ~backup files
# -p preserves timestamps
# This fixes errors such as
# *** ERROR: ambiguous python shebang in /usr/bin/kvm_stat: #!/usr/bin/python. Change it to python3 (or python2) explicitly.
# Process all files in the Documentation, scripts and tools directories.
pathfix.py -i "%{__python3} %{py3_shbang_opts}" -n -p \
    tools/kvm/kvm_stat/kvm_stat \
    scripts/show_delta \
    scripts/jobserver-exec \
    scripts/diffconfig \
    scripts/clang-tools \
    scripts/bloat-o-meter \
    tools \
    scripts \
    Documentation \
    drivers >/dev/null 2>&1

export LLVM=1 AR=llvm-ar CC=clang HOSTAR=llvm-ar HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld LD=ld.lld NM=llvm-nm OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump READELF=llvm-readelf STRIP=llvm-strip
[ -f .config ] && rm -vf .config*
%{make} distclean

cp %{SOURCE3} .config

tar -xf %{SOURCE2} -C .
cp -vr kernel-tfg/{configure-linux.sh,extra-configs} .
rm -rf kernel-tfg/
./configure-linux.sh

%if "%{name}" == "*opi5*"
sed -i 's@KBUILD_IMAGE	:= $(boot)/Image.gz@KBUILD_IMAGE	:= $(boot)/Image@' arch/arm64/Makefile
%global make_targets olddefconfig Image modules dtbs
%endif

%build
%{make} PYTHON=%{__python3} %{make_targets}

%install
rm -rf %{buildroot}
mkdir -p %{buildroot}

# install the kernel
mkdir -p %{buildroot}/boot
cp $(%{make} -s image_name) %{buildroot}/boot/vmlinuz-%{KVERREL}
chmod 755 %{buildroot}/boot/vmlinuz-%{KVERREL}

# install DTBs
%ifarch aarch64 || riscv64
%{make} INSTALL_DTBS_PATH=%{buildroot}/boot/dtb-%{KVERREL} dtbs_install
# delete "arch/%{build_arch}/boot/dts" because "$PWD" will be packaged in "%devel"
find arch/%{build_arch}/boot/dts -name '*.dtb' -type f -delete
%endif

# install modules
# '$(mod-fw)' is overridden because there is no reason to install any firmware
# since we already have 'linux-firmware' package as the dependency of this package.
%{make} INSTALL_MOD_STRIP=1 INSTALL_MOD_PATH=%{buildroot} mod-fw= modules_install

# install headers
%{make} INSTALL_HDR_PATH=%{buildroot}/usr headers_install

# install other key files too
install -m 644 .config %{buildroot}/boot/config-%{KVERREL}
install -m 644 .config %{buildroot}/lib/modules/%{KVERREL}/config
install -m 644 System.map %{buildroot}/boot/System.map-%{KVERREL}
install -m 644 System.map %{buildroot}/lib/modules/%{KVERREL}/System.map

# fix links
rm -rf %{buildroot}/lib/modules/%{KVERREL}/build
rm -rf %{buildroot}/lib/modules/%{KVERREL}/source
ln -fns /usr/src/kernels/%{KVERREL} %{buildroot}/lib/modules/%{KVERREL}/build
ln -fns /usr/src/kernels/%{KVERREL} %{buildroot}/lib/modules/%{KVERREL}/source

# install actual Linux src to /usr/src/kernels/%{KVERREL}
mkdir -p %{buildroot}/usr/src/kernels/%{KVERREL}
if [ -f scripts/package/install-extmod-build ]; then
    %{make} run-command KBUILD_RUN_COMMAND='%{_builddir}/%{src_dir}/scripts/package/install-extmod-build %{buildroot}/usr/src/kernels/%{KVERREL}'
else
    touch %{buildroot}/usr/src/kernels/%{KVERREL}/MAYBE_THIS_WORKS
fi

%clean
rm -rf %{buildroot}

%post
set -xeuf -o pipefail

if [ -x /sbin/installkernel -a -r /boot/vmlinuz-%{KVERREL} -a -r /boot/System.map-%{KVERREL} ]; then
    cp /boot/vmlinuz-%{KVERREL} /boot/.vmlinuz-%{KVERREL}-rpm
    cp /boot/System.map-%{KVERREL} /boot/.System.map-%{KVERREL}-rpm
    rm -f /boot/vmlinuz-%{KVERREL} /boot/System.map-%{KVERREL}
    /sbin/installkernel %{KVERREL} /boot/.vmlinuz-%{KVERREL}-rpm /boot/.System.map-%{KVERREL}-rpm
    rm -f /boot/.vmlinuz-%{KVERREL}-rpm /boot/.System.map-%{KVERREL}-rpm
fi

# we pushd into /boot because we want our symlinks to be
# vmlinuz -> vmlinuz-6.6.0-20231004.6.el9.aarch64
# and not
# vmlinuz -> /boot/vmlinuz-6.6.0-20231004.6.el9.aarch64
pushd /boot
rm -rvf dtb initramfs.img System.map vmlinuz
ln -s dtb-%{KVERREL} dtb
ln -s initramfs-%{KVERREL}.img initramfs.img
ln -s System.map-%{KVERREL} System.map
ln -s vmlinuz-%{KVERREL} vmlinuz
popd

%preun
# remove symlinks
rm -vf /boot/initramfs.img
rm -vf /boot/System.map
rm -vf /boot/vmlinuz

if [ -x /sbin/new-kernel-pkg ]; then
    new-kernel-pkg --remove %{KVERREL} --rminitrd --initrdfile=/boot/initramfs-%{KVERREL}.img
elif [ -x /usr/bin/kernel-install ]; then
    kernel-install remove %{KVERREL}
fi

%postun
if [ -x /sbin/update-bootloader ]; then
    /sbin/update-bootloader --remove %{KVERREL}
fi
[ -d /boot/dtb ] && rm -rf /boot/dtb

%files headers
%defattr (-, root, root)
/usr/include

%files devel
%defattr (-, root, root)
/usr/src/kernels/%{KVERREL}
/lib/modules/%{KVERREL}/build
/lib/modules/%{KVERREL}/source

%files
%defattr (-, root, root)
%exclude /lib/modules/%{KVERREL}/build
%exclude /lib/modules/%{KVERREL}/source
/lib/modules/%{KVERREL}
/boot/*