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feat(install): build for a named target kernel, not always the running one #22

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feat(install): build for a named target kernel, not always the running one #22

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56 changes: 46 additions & 10 deletions install.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,30 @@ else
echo "[INFO] CEDT not found โ€“ building **without** CXL (WO_CXL=1)."
fi

# Kernel to build for. Installing onto this machine needs neither input below; a
# caller installing for a different kernel (image build, or a locally built tree)
# gives one of them:
#
# XCENA_TARGET_KDIR kernel build tree. Default /lib/modules/<version>/build,
# the path DKMS and the distro header packages use.
# XCENA_TARGET_KVER kernel version. Names the DKMS registration, the install
# path, depmod and initramfs. Read from the tree when only
# XCENA_TARGET_KDIR is given.
KVER="${XCENA_TARGET_KVER:-}"
KDIR="${XCENA_TARGET_KDIR:-}"
if [[ -n "$KDIR" && -z "$KVER" ]]; then
KVER="$(make -s -C "$KDIR" kernelrelease 2>/dev/null || true)"
[[ -n "$KVER" ]] || { echo "[ERROR] cannot read kernelrelease from '${KDIR}'"; exit 1; }
fi
[[ -n "$KVER" ]] || KVER="$(uname -r)"
[[ -n "$KDIR" ]] || KDIR="/lib/modules/${KVER}/build"
if [[ ! -e "$KDIR" ]]; then
echo "[ERROR] kernel build tree not found: ${KDIR}"
echo " install linux-headers-${KVER}, or set XCENA_TARGET_KDIR to the tree."
exit 1
fi
echo "[INFO] target kernel: ${KVER} (build tree: ${KDIR})"

install_dkms() {
echo "[INFO] Installing ${PACKAGE_NAME} ${PACKAGE_VERSION} via DKMS..."

Expand All @@ -35,16 +59,25 @@ install_dkms() {
# Force-clean DKMS tree in case remove left stale entries
rm -rf "/var/lib/dkms/${PACKAGE_NAME}" 2>/dev/null || true

# Copy source to DKMS source tree (clean first to exclude build artifacts like mx_dma.mod.c)
# Copy source to DKMS source tree (clean first to exclude build artifacts like
# mx_dma.mod.c). The clean needs the target kernel's build tree too: with the
# default it runs against the running kernel, which during an image build is a
# kernel absent from this root, so the clean silently does nothing and the
# artifacts get copied.
rm -rf "${SRC_DIR}"
mkdir -p "${SRC_DIR}/scripts"
make clean 2>/dev/null || true
make BUILDSYSTEM_DIR="$KDIR" clean 2>/dev/null || true
cp -a Makefile dkms.conf *.c *.h "${SRC_DIR}/"
cp -a scripts/dkms-post-install.sh "${SRC_DIR}/scripts/"

# DKMS resolves the tree as /lib/modules/<kver>/build on its own, so only a
# tree outside that path has to be spelled out.
local dkms_src=()
[[ "$KDIR" != "/lib/modules/${KVER}/build" ]] && dkms_src=(--kernelsourcedir "$KDIR")

dkms add "${PACKAGE_NAME}/${PACKAGE_VERSION}"
dkms build "${PACKAGE_NAME}/${PACKAGE_VERSION}"
dkms install "${PACKAGE_NAME}/${PACKAGE_VERSION}" --force
dkms build "${PACKAGE_NAME}/${PACKAGE_VERSION}" -k "${KVER}" "${dkms_src[@]}"
dkms install "${PACKAGE_NAME}/${PACKAGE_VERSION}" -k "${KVER}" "${dkms_src[@]}" --force

echo "[INFO] DKMS installation completed. Module will auto-rebuild on kernel upgrades."
}
Expand All @@ -58,11 +91,11 @@ install_legacy() {
fi

# shellcheck disable=SC2086
make $MAKEVAR clean
make $MAKEVAR BUILDSYSTEM_DIR="$KDIR" clean
# shellcheck disable=SC2086
make $MAKEVAR -j"$(nproc)" install
make $MAKEVAR BUILDSYSTEM_DIR="$KDIR" -j"$(nproc)" install

depmod -a
depmod -a "${KVER}"
}

# Install module (prefer DKMS, fallback to legacy)
Expand All @@ -84,7 +117,10 @@ if [[ -f /etc/udev/rules.d/99-xcena_set_devdax_perm.rules \
|| -f /usr/local/sbin/xcena_set_devdax_perm ]]; then
rm -f /etc/udev/rules.d/99-xcena_set_devdax_perm.rules
rm -f /usr/local/sbin/xcena_set_devdax_perm
udevadm control --reload-rules
# Best-effort: udevd is not running during an image build, and what a booted
# system reads is the rule file, which is already gone by this point.
udevadm control --reload-rules 2>/dev/null \
|| echo "[INFO] udevd not running; rule change applies at boot."
echo "[INFO] Removed obsolete xcena_set_devdax_perm helper."
fi

Expand Down Expand Up @@ -122,8 +158,8 @@ fi
# where configured, the bundled mx_dma module.
if [[ "$INITRAMFS_BACKEND" == "initramfs-tools" ]]; then
echo "[INFO] Updating initramfs..."
update-initramfs -u -k "$(uname -r)"
update-initramfs -u -k "${KVER}"
elif [[ "$INITRAMFS_BACKEND" == "dracut" ]]; then
echo "[INFO] Updating initramfs via dracut..."
dracut --force --kver "$(uname -r)"
dracut --force --kver "${KVER}"
fi