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coreos-kernel: make build ccache friendly across versions

Browse Source 
The absolute path to the source tree includes the kernel's version
number and that path then lands in the kernel source code via the
numerous __FILE__ macros in the kernel source. So if the kernel source
version changes, even with a minor revision only, the entire cache can
be invalidated.

Reshuffle the build tree so that $S is a directory of symlinks to the
source and a nested build directory, ensuring the entire build can use
relative paths. A directory of symlinks instead of a single directory
symlink is required to prevent make from resolving the source directory
path to the original versioned path.
This commit is contained in:
Michael Marineau 2015-08-07 13:08:19 -07:00
parent e290b05988
commit 34bba21afd
1 changed files with 16 additions and 27 deletions
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43
sdk_container/src/third_party/coreos-overlay/eclass/coreos-kernel.eclass vendored
View File

@ -62,7 +62,7 @@ find_defconfig() {
# As if using cpio isn't bad enough already.
# If lib doesn't exist or isn't a symlink then nothing is returned.
get_bootengine_lib() {
cpio -itv --quiet < bootengine.cpio | \
cpio -itv --quiet < build/bootengine.cpio | \
awk '$1 ~ /^l/ && $9 == "lib" { print $11 }'
assert
}
@ -80,7 +80,7 @@ update_bootengine_cpio() {
# squash file ownership to root for new files.
--owner=root:root
# append to our local copy of bootengine
-F "${S}/bootengine.cpio"
-F "${S}/build/bootengine.cpio"
)
echo "Updating bootengine.cpio"
@ -93,10 +93,10 @@ kmake() {
if gcc-specs-pie; then
kernel_cflags="-nopie -fstack-check=no"
fi
emake -C "${KERNEL_DIR}" \
emake \
ARCH="${kernel_arch}" \
CROSS_COMPILE="${CHOST}-" \
KBUILD_OUTPUT="${S}" \
KBUILD_OUTPUT="build" \
KCFLAGS="${kernel_cflags}" \
LDFLAGS="" \
"$@"
@ -111,7 +111,8 @@ shred_keys() {
}
coreos-kernel_src_unpack() {
mkdir "${S}" || die
mkdir -p "${S}/build" || die
ln -s "${KERNEL_DIR}"/* "${S}/" || die
}
coreos-kernel_src_prepare() {
@ -120,25 +121,26 @@ coreos-kernel_src_prepare() {
die "Source is not clean! Run make mrproper in ${KERNEL_DIR}"
fi
restore_config .config
if [[ ! -f .config ]]; then
restore_config build/.config
if [[ ! -f build/.config ]]; then
local config="$(find_defconfig)"
elog "Building using default config ${config}"
cp "${config}" .config || die
cp "${config}" build/.config || die
fi
# copy the cpio initrd to the output build directory so we can tack it
# onto the kernel image itself.
cp "${ROOT}"/usr/share/bootengine/bootengine.cpio bootengine.cpio || die
cp "${ROOT}"/usr/share/bootengine/bootengine.cpio build/bootengine.cpio \
|| die "cp bootengine.cpio failed, try emerge-\$BOARD bootengine"
}
coreos-kernel_src_configure() {
if ! use audit; then
sed -i -e '/^CONFIG_CMDLINE=/s/"$/ audit=0"/' .config || die
sed -i -e '/^CONFIG_CMDLINE=/s/"$/ audit=0"/' build/.config || die
fi
if ! use selinux; then
sed -i -e '/CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE/d' .config || die
echo CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE=0 >> .config || die
sed -i -e '/CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE/d' build/.config || die
echo CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE=0 >> build/.config || die
fi
# Use default for any options not explitly set in defconfig
@ -197,22 +199,9 @@ coreos-kernel_src_install() {
dosym "../../../../boot/config-${version}" \
"/usr/lib/modules/${version}/build/.config"
save_config defconfig
save_config build/defconfig
shred_keys
}
# TODO(marineam): remove this function once KBUILD_OUTPUT is removed
# from src/scripts/setup_board
coreos-kernel_pkg_postinst() {
[[ -n "${KBUILD_OUTPUT}" ]] || return 0
# linux-info always expects to be able to find the current .config
# so copy it into the build tree if it isn't already there.
if ! cmp --quiet "${ROOT}/usr/boot/config" "${KBUILD_OUTPUT}/.config"; then
cp "${ROOT}/usr/boot/config" "${KBUILD_OUTPUT}/.config"
chown ${PORTAGE_USERNAME:-portage}:${PORTAGE_GRPNAME:-portage} \
"${KBUILD_OUTPUT}/.config"
fi
}
EXPORT_FUNCTIONS src_unpack src_prepare src_configure src_compile src_install pkg_postinst
EXPORT_FUNCTIONS src_unpack src_prepare src_configure src_compile src_install