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files/zfs/3760.2.0/overlay/eclass/dist-kernel-utils.eclass
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| # Copyright 2020-2023 Gentoo Authors | ||
| # Distributed under the terms of the GNU General Public License v2 | ||
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| # @ECLASS: dist-kernel-utils.eclass | ||
| # @MAINTAINER: | ||
| # Distribution Kernel Project <dist-kernel@gentoo.org> | ||
| # @AUTHOR: | ||
| # Michał Górny <mgorny@gentoo.org> | ||
| # @SUPPORTED_EAPIS: 7 8 | ||
| # @BLURB: Utility functions related to Distribution Kernels | ||
| # @DESCRIPTION: | ||
| # This eclass provides various utility functions related to Distribution | ||
| # Kernels. | ||
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||
| # @ECLASS_VARIABLE: KERNEL_IUSE_SECUREBOOT | ||
| # @PRE_INHERIT | ||
| # @DEFAULT_UNSET | ||
| # @DESCRIPTION: | ||
| # If set to a non-null value, inherits secureboot.eclass | ||
| # and allows signing of generated kernel images. | ||
|
|
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| if [[ ! ${_DIST_KERNEL_UTILS} ]]; then | ||
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| case ${EAPI} in | ||
| 7|8) ;; | ||
| *) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;; | ||
| esac | ||
|
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||
| if [[ ${KERNEL_IUSE_SECUREBOOT} ]]; then | ||
| inherit secureboot | ||
| fi | ||
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| # @FUNCTION: dist-kernel_build_initramfs | ||
| # @USAGE: <output> <version> | ||
| # @DESCRIPTION: | ||
| # Build an initramfs for the kernel. <output> specifies the absolute | ||
| # path where initramfs will be created, while <version> specifies | ||
| # the kernel version, used to find modules. | ||
| # | ||
| # Note: while this function uses dracut at the moment, other initramfs | ||
| # variants may be supported in the future. | ||
| dist-kernel_build_initramfs() { | ||
| debug-print-function ${FUNCNAME} "${@}" | ||
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| [[ ${#} -eq 2 ]] || die "${FUNCNAME}: invalid arguments" | ||
| local output=${1} | ||
| local version=${2} | ||
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| local rel_image_path=$(dist-kernel_get_image_path) | ||
| local image=${output%/*}/${rel_image_path##*/} | ||
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| local args=( | ||
| --force | ||
| # if uefi=yes is used, dracut needs to locate the kernel image | ||
| --kernel-image "${image}" | ||
|
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| # positional arguments | ||
| "${output}" "${version}" | ||
| ) | ||
|
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| ebegin "Building initramfs via dracut" | ||
| dracut "${args[@]}" | ||
| eend ${?} || die -n "Building initramfs failed" | ||
| } | ||
|
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||
| # @FUNCTION: dist-kernel_get_image_path | ||
| # @DESCRIPTION: | ||
| # Get relative kernel image path specific to the current ${ARCH}. | ||
| dist-kernel_get_image_path() { | ||
| case ${ARCH} in | ||
| amd64|x86) | ||
| echo arch/x86/boot/bzImage | ||
| ;; | ||
| arm64) | ||
| echo arch/arm64/boot/Image.gz | ||
| ;; | ||
| arm) | ||
| echo arch/arm/boot/zImage | ||
| ;; | ||
| hppa|ppc|ppc64|sparc) | ||
| # https://www.kernel.org/doc/html/latest/powerpc/bootwrapper.html | ||
| # ./ is required because of ${image_path%/*} | ||
| # substitutions in the code | ||
| echo ./vmlinux | ||
| ;; | ||
| riscv) | ||
| echo arch/riscv/boot/Image.gz | ||
| ;; | ||
| *) | ||
| die "${FUNCNAME}: unsupported ARCH=${ARCH}" | ||
| ;; | ||
| esac | ||
| } | ||
|
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||
| # @FUNCTION: dist-kernel_install_kernel | ||
| # @USAGE: <version> <image> <system.map> | ||
| # @DESCRIPTION: | ||
| # Install kernel using installkernel tool. <version> specifies | ||
| # the kernel version, <image> full path to the image, <system.map> | ||
| # full path to System.map. | ||
| dist-kernel_install_kernel() { | ||
| debug-print-function ${FUNCNAME} "${@}" | ||
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| [[ ${#} -eq 3 ]] || die "${FUNCNAME}: invalid arguments" | ||
| local version=${1} | ||
| local image=${2} | ||
| local map=${3} | ||
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| # if dracut is used in uefi=yes mode, initrd will actually | ||
| # be a combined kernel+initramfs UEFI executable. we can easily | ||
| # recognize it by PE magic (vs cpio for a regular initramfs) | ||
| local initrd=${image%/*}/initrd | ||
| local magic | ||
| [[ -s ${initrd} ]] && read -n 2 magic < "${initrd}" | ||
| if [[ ${magic} == MZ ]]; then | ||
| einfo "Combined UEFI kernel+initramfs executable found" | ||
| # install the combined executable in place of kernel | ||
| image=${initrd%/*}/uki.efi | ||
| mv "${initrd}" "${image}" || die | ||
| # We moved the generated initrd, prevent dracut from running again | ||
| # https://github.com/dracutdevs/dracut/pull/2405 | ||
| shopt -s nullglob | ||
| local plugins=() | ||
| for file in "${EROOT}"/etc/kernel/install.d/*.install; do | ||
| plugins+=( "${file}" ) | ||
| done | ||
| for file in "${EROOT}"/usr/lib/kernel/install.d/*.install; do | ||
| if ! has "${file##*/}" 50-dracut.install 51-dracut-rescue.install "${plugins[@]##*/}"; then | ||
| plugins+=( "${file}" ) | ||
| fi | ||
| done | ||
| shopt -u nullglob | ||
| export KERNEL_INSTALL_PLUGINS="${KERNEL_INSTALL_PLUGINS} ${plugins[@]}" | ||
| fi | ||
|
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||
| if [[ ${KERNEL_IUSE_SECUREBOOT} ]]; then | ||
| # Kernel-install requires uki's are named uki.efi, sign in-place | ||
| secureboot_sign_efi_file "${image}" "${image}" | ||
| fi | ||
|
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||
| ebegin "Installing the kernel via installkernel" | ||
| # note: .config is taken relatively to System.map; | ||
| # initrd relatively to bzImage | ||
| installkernel "${version}" "${image}" "${map}" | ||
| eend ${?} || die -n "Installing the kernel failed" | ||
| } | ||
|
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||
| # @FUNCTION: dist-kernel_reinstall_initramfs | ||
| # @USAGE: <kv-dir> <kv-full> | ||
| # @DESCRIPTION: | ||
| # Rebuild and install initramfs for the specified dist-kernel. | ||
| # <kv-dir> is the kernel source directory (${KV_DIR} from linux-info), | ||
| # while <kv-full> is the full kernel version (${KV_FULL}). | ||
| # The function will determine whether <kernel-dir> is actually | ||
| # a dist-kernel, and whether initramfs was used. | ||
| # | ||
| # This function is to be used in pkg_postinst() of ebuilds installing | ||
| # kernel modules that are included in the initramfs. | ||
| dist-kernel_reinstall_initramfs() { | ||
| debug-print-function ${FUNCNAME} "${@}" | ||
|
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| [[ ${#} -eq 2 ]] || die "${FUNCNAME}: invalid arguments" | ||
| local kernel_dir=${1} | ||
| local ver=${2} | ||
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| local image_path=${kernel_dir}/$(dist-kernel_get_image_path) | ||
| local initramfs_path=${image_path%/*}/initrd | ||
| if [[ ! -f ${image_path} ]]; then | ||
| eerror "Kernel install missing, image not found:" | ||
| eerror " ${image_path}" | ||
| eerror "Initramfs will not be updated. Please reinstall your kernel." | ||
| return | ||
| fi | ||
| if [[ ! -f ${initramfs_path} && ! -f ${initramfs_path%/*}/uki.efi ]]; then | ||
| einfo "No initramfs or uki found at ${image_path}" | ||
| return | ||
| fi | ||
|
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| dist-kernel_build_initramfs "${initramfs_path}" "${ver}" | ||
| dist-kernel_install_kernel "${ver}" "${image_path}" \ | ||
| "${kernel_dir}/System.map" | ||
| } | ||
|
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| # @FUNCTION: dist-kernel_PV_to_KV | ||
| # @USAGE: <pv> | ||
| # @DESCRIPTION: | ||
| # Convert a Gentoo-style ebuild version to kernel "x.y.z[-rcN]" version. | ||
| dist-kernel_PV_to_KV() { | ||
| debug-print-function ${FUNCNAME} "${@}" | ||
|
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| [[ ${#} -ne 1 ]] && die "${FUNCNAME}: invalid arguments" | ||
| local pv=${1} | ||
|
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| local kv=${pv%%_*} | ||
| [[ -z $(ver_cut 3- "${kv}") ]] && kv+=".0" | ||
| [[ ${pv} == *_* ]] && kv+=-${pv#*_} | ||
| echo "${kv}" | ||
| } | ||
|
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| _DIST_KERNEL_UTILS=1 | ||
| fi |
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