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Merge pull request #920 from krishjainx/sysext-internship
Build_sysext script to enable sysext builds in the OS image build process
This commit is contained in:
Kai Lüke
GitHub
commit
eb2f3d543d
@ -78,6 +78,7 @@ create_prod_image() {
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local image_initrd_contents_wtd="${image_name%.bin}_initrd_contents_wtd.txt"
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local image_disk_usage="${image_name%.bin}_disk_usage.txt"
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local image_pkgdb="${image_name%.bin}_pkgdb.tar.xz"
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local image_sysext_base="${image_name%.bin}_sysext.squashfs"
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start_image "${image_name}" "${disk_layout}" "${root_fs_dir}" "${update_group}"
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@ -102,7 +103,11 @@ create_prod_image() {
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fi
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tar -cf "${BUILD_DIR}/${image_pkgdb}" -C "${root_fs_dir}" var/cache/edb var/db/pkg
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sudo cp -a "${root_fs_dir}" "${BUILD_DIR}/root_fs_dir2"
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sudo rsync -a --delete "${BUILD_DIR}/configroot/etc/portage" "${BUILD_DIR}/root_fs_dir2/etc"
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sudo mksquashfs "${BUILD_DIR}/root_fs_dir2" "${BUILD_DIR}/${image_sysext_base}" -noappend
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sudo rm -rf "${BUILD_DIR}/root_fs_dir2"
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# clean-ups of things we do not need
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sudo rm ${root_fs_dir}/etc/csh.env
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sudo rm -rf ${root_fs_dir}/etc/env.d
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@ -162,6 +167,7 @@ EOF
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"${BUILD_DIR}/${image_initrd_contents}"
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"${BUILD_DIR}/${image_initrd_contents_wtd}"
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"${BUILD_DIR}/${image_disk_usage}"
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"${BUILD_DIR}/${image_sysext_base}"
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)
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local files_to_evaluate=( "${BUILD_DIR}/${image_name}" )
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171
build_sysext
Executable file
171
build_sysext
Executable file
@ -0,0 +1,171 @@
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#!/bin/bash
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# Copyright (c) 2023 The Flatcar Maintainers.
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# Use of this source code is governed by a BSD-style license that can
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# be found in the LICENSE file.
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#
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# Script to generate sysext. See systemd-sysext(8). Prerequisite is
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# that you've run build_packages and build_image.
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SCRIPT_ROOT=$(dirname "$(readlink -f "$0")")
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. "${SCRIPT_ROOT}/common.sh" || exit 1
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# Script must run inside the chroot
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assert_inside_chroot
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assert_root_user
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# All these are used to set up the 'BUILD_DIR' variable
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DEFINE_string board "${DEFAULT_BOARD}" \
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"The board to build a sysext for."
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DEFINE_string build_dir '' \
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"Directory used for building the sysext image, must exist, but should be empty."
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DEFINE_string metapkgs '' \
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"Comma-separated list of meta-packages to build from source and install into sysext image."
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DEFINE_string manglefs_script '' \
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"A path to executable that will customize the rootfs of the sysext image."
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DEFINE_string squashfs_base '' \
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"The path to the squashfs base image."
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FLAGS_HELP="USAGE: build_sysext [flags] [sysext name] [binary packages to install into image].
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This script is used to build a Flatcar sysext image.
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Examples:
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Builds a sysext image named interpreters in the images
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directory with dev-lang/python and dev-lang/perl packages for amd64:
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sudo build_sysext \
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--board=amd64-usr \
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--build_dir=images \
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interpreters dev-lang/python dev-lang/perl
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Builds a sysext image named oem-azure in the oem-images directory with
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metapackage coreos-base/oem-azure for arm64:
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sudo build_sysext \
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--board=arm64-usr \
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--build_dir=oem-images \
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--metapkgs=coreos-base/oem-azure \
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--mangle_fs=…/coreos-base/oem-azure/files/manglefs.sh \
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oem-azure
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"
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show_help_if_requested "$@"
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# Parse command line
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FLAGS "$@" || exit 1
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eval set -- "${FLAGS_ARGV}"
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. "${BUILD_LIBRARY_DIR}/board_options.sh" || exit 1
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if [[ -z "${FLAGS_build_dir}" ]]; then
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die "Need a build directory to be specified with a --build_dir option"
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fi
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BUILD_DIR=$(realpath "${FLAGS_build_dir}")
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# Architecture values are taken from systemd.unit(5).
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declare -A SYSEXT_ARCHES
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SYSEXT_ARCHES['amd64-usr']='x86-64'
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SYSEXT_ARCHES['arm64-usr']='arm64'
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declare -r SYSEXT_ARCHES
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# Usage: _get_sysext_arch board [board...]
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_get_sysext_arch() {
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local board=${1}
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if [[ ${#SYSEXT_ARCHES["${board}"]} -ne 0 ]]; then
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echo "${SYSEXT_ARCHES["${board}"]}"
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else
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die "Unknown board '${board}'"
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fi
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}
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set -euo pipefail
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cleanup() {
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umount "${BUILD_DIR}/fs-root" "${BUILD_DIR}/install-root" "${BUILD_DIR}/workdir" 2>/dev/null || true
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rm -rf "${BUILD_DIR}/fs-root" "${BUILD_DIR}/install-root" "${BUILD_DIR}/workdir" || true
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}
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if [[ ${#} -lt 1 ]]; then
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show_help_if_requested -h
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die 'Expected at least one parameter for sysext image name'
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fi
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SYSEXTNAME="${1}"
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shift
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# Set up trap to execute cleanup() on script exit
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trap cleanup EXIT
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ARCH=$(_get_sysext_arch "${FLAGS_board}")
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if [[ -z "${FLAGS_squashfs_base}" ]]; then
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FLAGS_squashfs_base="${BUILD_DIR}/flatcar_production_image_sysext.squashfs"
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fi
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cleanup
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mkdir "${BUILD_DIR}/fs-root"
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mount -rt squashfs -o loop,nodev "${FLAGS_squashfs_base}" "${BUILD_DIR}/fs-root"
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mkdir "${BUILD_DIR}/install-root"
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mkdir "${BUILD_DIR}/workdir"
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mount -t overlay overlay -o lowerdir="${BUILD_DIR}/fs-root",upperdir="${BUILD_DIR}/install-root",workdir="${BUILD_DIR}/workdir" "${BUILD_DIR}/install-root"
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VERSION_BOARD=$(grep "^VERSION=" ${BUILD_DIR}/fs-root/usr/lib/os-release | cut -d = -f 2-)
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if [ "$VERSION_BOARD" != "$FLATCAR_VERSION" ]; then
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echo "$VERSION_BOARD"
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echo "$FLATCAR_VERSION"
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echo "Version mismatch between board flatcar release and SDK container flatcar release"
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exit 1
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fi
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if [[ -n "${FLAGS_metapkgs}" ]]; then
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mapfile -t metapkgs < <(tr ',' '\n' <<<"${FLAGS_metapkgs}")
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"emerge-${FLAGS_board}" --nodeps --buildpkgonly --usepkg n --verbose "${metapkgs[@]}"
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set -- "${metapkgs[@]}" "${@}"
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fi
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for package; do
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echo "Installing package into sysext image: $package"
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FEATURES="-ebuild-locks" emerge \
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--root="${BUILD_DIR}/install-root" \
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--config-root="/build/${FLAGS_board}" \
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--sysroot="/build/${FLAGS_board}" \
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--root-deps=rdeps \
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--usepkgonly \
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--verbose \
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"${package}"
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done
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# Unmount in order to get rid of the overlay
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umount "${BUILD_DIR}/install-root"
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umount "${BUILD_DIR}/fs-root"
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if [[ -n "${FLAGS_manglefs_script}" ]]; then
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if [[ ! -x "${FLAGS_manglefs_script}" ]]; then
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die "${FLAGS_manglefs_script} is not executable"
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fi
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"${FLAGS_manglefs_script}" "${BUILD_DIR}/install-root"
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fi
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info "Removing non-/usr directories from sysext image"
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for entry in "${BUILD_DIR}/install-root"/*; do
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if [[ "${entry}" = */usr ]]; then
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continue
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fi
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info " Removing ${entry##*/}"
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rm -rf "${entry}"
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done
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mkdir -p "${BUILD_DIR}/install-root/usr/lib/extension-release.d"
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version_field="${VERSION_FIELD_OVERRIDE:-VERSION_ID=${FLATCAR_VERSION_ID}}"
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all_fields=(
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'ID=flatcar'
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"${version_field}"
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"ARCHITECTURE=${ARCH}"
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)
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printf '%s\n' "${all_fields[@]}" >"${BUILD_DIR}/install-root/usr/lib/extension-release.d/extension-release.${SYSEXTNAME}"
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mksquashfs "${BUILD_DIR}/install-root" "${BUILD_DIR}/${SYSEXTNAME}.raw"
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rm -rf "${BUILD_DIR}"/{fs-root,install-root,workdir}
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