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# Copyright 2019-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
inherit mount-boot savedconfig toolchain-funcs
MY_P=linux-${PV}
TCL_VER=10.1
AMD64_CONFIG_VER=5.4.7.arch1-1
AMD64_CONFIG_HASH=ff79453bc0451a9083bdaa02c3901372d61a9982
I686_CONFIG_VER=5.4.3-arch1
I686_CONFIG_HASH=076a52d43a08c4b3a3eacd1f2f9a855fb3b62f42
DESCRIPTION="Linux kernel built from vanilla upstream sources"
HOMEPAGE="https://www.kernel.org/"
SRC_URI="https://cdn.kernel.org/pub/linux/kernel/v5.x/${MY_P}.tar.xz
amd64? (
https://git.archlinux.org/svntogit/packages.git/plain/trunk/config?h=packages/linux&id=${AMD64_CONFIG_HASH}
-> linux-${AMD64_CONFIG_VER}.amd64.config
test? (
https://dev.gentoo.org/~mgorny/dist/tinycorelinux-${TCL_VER}-amd64.qcow2
)
)
x86? (
https://git.archlinux32.org/packages/plain/core/linux/config.i686?id=${I686_CONFIG_HASH}
-> linux-${I686_CONFIG_VER}.i686.config
test? (
https://dev.gentoo.org/~mgorny/dist/tinycorelinux-${TCL_VER}-x86.qcow2
)
)"
S=${WORKDIR}/${MY_P}
LICENSE="GPL-2"
SLOT="${PV}"
KEYWORDS="~amd64 ~x86"
IUSE="+initramfs test"
RESTRICT="!test? ( test ) test? ( userpriv )"
# install-DEPEND actually
# note: we need installkernel with initramfs support!
RDEPEND="
|| (
sys-kernel/installkernel-gentoo
sys-kernel/installkernel-systemd-boot
)
initramfs? ( >=sys-kernel/dracut-049-r3 )"
BDEPEND="
sys-devel/bc
virtual/libelf
test? (
dev-tcltk/expect
sys-kernel/dracut
amd64? ( app-emulation/qemu[qemu_softmmu_targets_x86_64] )
x86? ( app-emulation/qemu[qemu_softmmu_targets_i386] )
)"
pkg_pretend() {
mount-boot_pkg_pretend
ewarn "This is an experimental package. The built kernel and/or initramfs"
ewarn "may not work at all or fail with your bootloader configuration. Please"
ewarn "make sure to keep a backup kernel available before testing it."
}
src_configure() {
# force ld.bfd if we can find it easily
local LD="$(tc-getLD)"
if type -P "${LD}.bfd" &>/dev/null; then
LD+=.bfd
fi
MAKEARGS=(
V=1
HOSTCC="$(tc-getCC)"
HOSTCXX="$(tc-getCXX)"
HOSTCFLAGS="${CFLAGS}"
HOSTLDFLAGS="${LDFLAGS}"
AS="$(tc-getAS)"
CC="$(tc-getCC)"
LD="${LD}"
AR="$(tc-getAR)"
NM="$(tc-getNM)"
STRIP=":"
OBJCOPY="$(tc-getOBJCOPY)"
OBJDUMP="$(tc-getOBJDUMP)"
# we need to pass it to override colliding Gentoo envvar
ARCH=x86
)
case ${ARCH} in
amd64)
cp "${DISTDIR}"/linux-${AMD64_CONFIG_VER}.amd64.config .config || die
;;
x86)
cp "${DISTDIR}"/linux-${I686_CONFIG_VER}.i686.config .config || die
;;
*)
die "Unsupported arch ${ARCH}"
;;
esac
# while Arch config is cool, we don't want gcc plugins as they
# break distcc
sed -i -e '/GCC_PLUGIN/d' .config || die
# module compression prevents us from stripping them post-inst
sed -i -e '/MODULE_COMPRESS/d' .config || die
# shove our theft under the carpet!
sed -i -e '/HOSTNAME/s:archlinux:gentoo:' .config || die
# hey, we do support x32
sed -i -e '/CONFIG_X86_X32/s:.*:CONFIG_X86_X32=y:' .config || die
restore_config .config
mkdir -p "${WORKDIR}"/modprep || die
mv .config "${WORKDIR}"/modprep/ || die
emake O="${WORKDIR}"/modprep "${MAKEARGS[@]}" olddefconfig
emake O="${WORKDIR}"/modprep "${MAKEARGS[@]}" modules_prepare
cp -pR "${WORKDIR}"/modprep "${WORKDIR}"/build || die
}
src_compile() {
emake O="${WORKDIR}"/build "${MAKEARGS[@]}" all
}
get_kern_arch() {
echo x86
}
src_test() {
local image_arch=${ARCH}
local qemu_arch=$(usex amd64 x86_64 i386)
emake O="${WORKDIR}"/build "${MAKEARGS[@]}" \
INSTALL_MOD_PATH="${T}" modules_install
dracut \
--conf /dev/null \
--confdir /dev/null \
--no-hostonly \
--kmoddir "${T}/lib/modules/${PV}" \
"${T}/initrd" "${PV}" || die
cp "${DISTDIR}/tinycorelinux-${TCL_VER}-${image_arch}.qcow2" \
"${T}/fs.qcow2" || die
cd "${T}" || die
cat > run.sh <<-EOF || die
#!/bin/sh
exec qemu-system-${qemu_arch} \
-m 256M \
-display none \
-no-reboot \
-kernel '${WORKDIR}/build/arch/$(get_kern_arch)/boot/bzImage' \
-initrd '${T}/initrd' \
-serial mon:stdio \
-hda '${T}/fs.qcow2' \
-append 'root=/dev/sda console=ttyS0,115200n8'
EOF
chmod +x run.sh || die
# TODO: initramfs does not let core finish starting on some systems,
# figure out how to make it better at that
expect - <<-EOF || die "Booting kernel failed"
set timeout 900
spawn ./run.sh
expect {
"Kernel panic" {
send_error "\n* Kernel panic"
exit 1
}
"Entering emergency mode" {
send_error "\n* Initramfs failed to start the system"
exit 1
}
"Core 10.1" {
send_error "\n* Booted to login"
exit 0
}
timeout {
send_error "\n* Kernel boot timed out"
exit 2
}
}
EOF
}
src_install() {
# do not use 'make install' as it behaves differently based
# on what kind of installkernel is installed
emake O="${WORKDIR}"/build "${MAKEARGS[@]}" \
INSTALL_MOD_PATH="${ED}" modules_install
# note: we're using mv rather than doins to save space and time
# install main and arch-specific headers first, and scripts
local kern_arch=$(get_kern_arch)
dodir "/usr/src/linux-${PV}/arch/${kern_arch}"
mv include scripts "${ED}/usr/src/linux-${PV}/" || die
mv "arch/${kern_arch}/include" \
"${ED}/usr/src/linux-${PV}/arch/${kern_arch}/" || die
# remove everything but Makefile* and Kconfig*
find -type f '!' '(' -name 'Makefile*' -o -name 'Kconfig*' ')' \
-delete || die
find -type l -delete || die
cp -p -R * "${ED}/usr/src/linux-${PV}/" || die
cd "${WORKDIR}" || die
# strip out-of-source build stuffs from modprep
# and then copy built files as well
find modprep -type f '(' \
-name Makefile -o \
-name '*.[ao]' -o \
'(' -name '.*' -a -not -name '.config' ')' \
')' -delete || die
rm modprep/source || die
cp -p -R modprep/. "${ED}/usr/src/linux-${PV}"/ || die
# install the kernel and files needed for module builds
cp build/{arch/x86/boot/bzImage,System.map,Module.symvers} \
"${ED}/usr/src/linux-${PV}"/ || die
# strip empty directories
find "${D}" -type d -empty -exec rmdir {} + || die
# fix source tree and build dir symlinks
dosym ../../../usr/src/linux-${PV} /lib/modules/${PV}/build
dosym ../../../usr/src/linux-${PV} /lib/modules/${PV}/source
save_config build/.config
}
pkg_preinst() {
:
}
pkg_postinst() {
if [[ -z ${ROOT} ]]; then
mount-boot_pkg_preinst
if use initramfs; then
ebegin "Building initramfs via dracut"
# putting it alongside kernel image as 'initrd' makes
# kernel-install happier
dracut --force "${EROOT}/usr/src/linux-${PV}/initrd" "${PV}"
eend ${?} || die "Building initramfs failed"
fi
ebegin "Installing the kernel via installkernel"
# note: .config is taken relatively to System.map;
# initrd relatively to bzImage
installkernel "${PV}" \
"${EROOT}/usr/src/linux-${PV}/bzImage" \
"${EROOT}/usr/src/linux-${PV}/System.map"
eend ${?} || die "Installing the kernel failed"
fi
if [[ ! -e ${EROOT}/usr/src/linux ]]; then
ebegin "Creating /usr/src/linux symlink"
ln -f -n -s linux-${PV} "${EROOT}"/usr/src/linux
eend ${?}
else
local symlink_target=$(readlink "${EROOT}"/usr/src/linux)
local symlink_ver=${symlink_target#linux-}
if [[ ${symlink_target} == linux-* && -z ${symlink_ver//[0-9.]/} ]]
then
local symlink_pkg=${CATEGORY}/${PN}-${symlink_ver}
# if the current target is either being replaced, or still
# installed (probably depclean candidate), update the symlink
if has "${symlink_ver}" ${REPLACING_VERSIONS} ||
has_version -r "~${symlink_pkg}"
then
ebegin "Updating /usr/src/linux symlink"
ln -f -n -s linux-${PV} "${EROOT}"/usr/src/linux
eend ${?}
fi
fi
fi
savedconfig_pkg_postinst
}
pkg_prerm() {
:
}
pkg_postrm() {
rm -f "${EROOT}/usr/src/linux-${PV}/initrd" &&
rmdir --ignore-fail-on-non-empty "${EROOT}/usr/src/linux-${PV}"
}
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