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https://github.com/kata-containers/kata-containers.git
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a00a7c500a
In some cases, /init is not following two levels of symlinks i.e. /init to /sbin/init to /lib/systemd/systemd Setting /init directly to /lib/systemd/systemd when AGENT_INIT is not mandated Signed-Off-By: Ryan Savino <ryan.savino@amd.com>
90 lines
2.5 KiB
Bash
Executable File
90 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Copyright (c) 2018 HyperHQ Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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[ -z "${DEBUG}" ] || set -x
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set -o errexit
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# set -o nounset
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set -o pipefail
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script_name="${0##*/}"
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script_dir="$(dirname $(readlink -f $0))"
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lib_file="${script_dir}/../scripts/lib.sh"
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source "$lib_file"
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INITRD_IMAGE="${INITRD_IMAGE:-kata-containers-initrd.img}"
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AGENT_BIN=${AGENT_BIN:-kata-agent}
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AGENT_INIT=${AGENT_INIT:-no}
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usage()
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{
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error="${1:-0}"
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cat <<EOF
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Usage: ${script_name} [options] <rootfs-dir>
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This script creates a Kata Containers initrd image file based on the
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<rootfs-dir> directory.
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Options:
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-h Show help
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-o Set the path where the generated image file is stored.
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DEFAULT: the path stored in the environment variable INITRD_IMAGE
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Extra environment variables:
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AGENT_BIN: use it to change the expected agent binary name
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DEFAULT: kata-agent
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AGENT_INIT: use kata agent as init process
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DEFAULT: no
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EOF
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exit "${error}"
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}
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while getopts "ho:" opt
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do
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case "$opt" in
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h) usage ;;
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o) INITRD_IMAGE="${OPTARG}" ;;
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esac
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done
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shift $(( $OPTIND - 1 ))
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ROOTFS="$1"
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[ -n "${ROOTFS}" ] || usage
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[ -d "${ROOTFS}" ] || die "${ROOTFS} is not a directory"
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ROOTFS=$(readlink -f ${ROOTFS})
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IMAGE_DIR=$(dirname ${INITRD_IMAGE})
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IMAGE_DIR=$(readlink -f ${IMAGE_DIR})
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IMAGE_NAME=$(basename ${INITRD_IMAGE})
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# The kata rootfs image expects init to be installed
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init="${ROOTFS}/sbin/init"
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[ -x "${init}" ] || [ -L ${init} ] || die "/sbin/init is not installed in ${ROOTFS}"
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OK "init is installed"
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[ "${AGENT_INIT}" == "yes" ] || [ -x "${ROOTFS}/usr/bin/${AGENT_BIN}" ] || \
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die "/usr/bin/${AGENT_BIN} is not installed in ${ROOTFS}
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use AGENT_BIN env variable to change the expected agent binary name"
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OK "Agent is installed"
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# initramfs expects /init, create symlink only if ${ROOTFS}/init does not exist
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# Init may be provided by other packages, e.g. systemd or GPU initrd/rootfs
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if [ ! -x "${ROOTFS}/init" ] && [ ! -L "${ROOTFS}/init" ]; then
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# ATTN: In some instances, /init is not following two or more levels of symlinks
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# i.e. (/init to /sbin/init to /lib/systemd/systemd)
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# Setting /init directly to /lib/systemd/systemd when AGENT_INIT is disabled
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if [ "${AGENT_INIT}" = "yes" ]; then
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sudo ln -sf /sbin/init "${ROOTFS}/init"
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else
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sudo ln -sf /lib/systemd/systemd "${ROOTFS}/init"
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fi
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fi
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info "Creating ${IMAGE_DIR}/${IMAGE_NAME} based on rootfs at ${ROOTFS}"
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( cd "${ROOTFS}" && sudo find . | sudo cpio -H newc -o | gzip -9 ) > "${IMAGE_DIR}"/"${IMAGE_NAME}"
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