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See mkinitramfs(8) for further details. EOF } usage_error() { usage >&2 exit 2 } OPTIONS=$(getopt -o c:d:hko:r:v --long help -n "$0" -- "$@") || usage_error eval set -- "$OPTIONS" while true; do case "$1" in -c) compress="$2" shift 2 ;; -d) CONFDIR="$2" shift 2 if [ ! -d "${CONFDIR}" ]; then echo "${0}: ${CONFDIR}: Not a directory" >&2 exit 1 fi ;; -h|--help) usage exit 0 ;; -o) outfile="$2" shift 2 ;; -k) keep="y" shift ;; -r) ROOT="$2" shift 2 ;; -v) verbose="y" shift ;; --) shift break ;; *) echo "Internal error!" >&2 exit 1 ;; esac done # For dependency ordered mkinitramfs hook scripts. . /usr/share/initramfs-tools/scripts/functions . /usr/share/initramfs-tools/hook-functions # Auto-export any variables set in the conf snippets such that # initramfs hooks can configure each other # i.e. initramfs-tools-ubuntu-core affecting # intel-microcode/amd-microcode hook defaults set -a . "${CONFDIR}/initramfs.conf" EXTRA_CONF='' maybe_add_conf() { if [ -e "$1" ] && \ basename "$1" \ | grep '^[[:alnum:]][[:alnum:]\._-]*$' \ | grep -qv '\.dpkg-.*$'; then if [ -d "$1" ]; then echo "W: $1 is a directory instead of file" >&2 else EXTRA_CONF="${EXTRA_CONF} $1" . "$1" fi fi } for i in /usr/share/initramfs-tools/conf.d/*; do # Configuration files in /etc mask those in /usr/share if ! [ -e "${CONFDIR}"/conf.d/"$(basename "${i}")" ]; then maybe_add_conf "${i}" fi done for i in "${CONFDIR}"/conf.d/*; do maybe_add_conf "${i}" done # source package confs for i in /usr/share/initramfs-tools/conf-hooks.d/*; do if [ -d "${i}" ]; then echo "W: ${i} is a directory instead of file." >&2 elif [ -e "${i}" ]; then . "${i}" fi done # Finish loading conf snippets set +a # Check busybox dependency if [ "${BUSYBOX}" = "y" ] && [ -z "${BUSYBOXDIR}" ]; then echo >&2 "E: busybox-initramfs, version 1:1.30.1-4ubuntu5~ or later, is required but not installed" exit 1 fi if [ -n "${UMASK:-}" ]; then umask "${UMASK}" fi if [ -z "${outfile}" ]; then usage_error fi touch "$outfile" outfile="$(readlink -f "$outfile")" # And by "version" we really mean path to kernel modules # This is braindead, and exists to preserve the interface with mkinitrd if [ ${#} -ne 1 ]; then version="$(uname -r)" else version="${1}" fi case "${version}" in /lib/modules/*/[!/]*) ;; /lib/modules/[!/]*) version="${version#/lib/modules/}" version="${version%%/*}" ;; esac case "${version}" in */*) echo "$PROG: ${version} is not a valid kernel version" >&2 exit 2 ;; esac if [ -z "${compress:-}" ]; then compress=${COMPRESS?} fi unset COMPRESS if ! command -v "${compress}" >/dev/null 2>&1; then compress=gzip [ "${verbose}" = y ] && \ echo "No ${compress} in ${PATH}, using gzip" fi case "${compress}" in gzip) # If we're doing a reproducible build, use gzip -n if [ -n "${SOURCE_DATE_EPOCH}" ]; then compress="gzip -n" # Otherwise, substitute pigz if it's available elif command -v pigz >/dev/null; then compress=pigz fi ;; lz4) compress="lz4 -9 -l" ;; zstd) compress="zstd -q -19 -T0" ;; xz) compress="xz --check=crc32" # If we're not doing a reproducible build, enable multithreading test -z "${SOURCE_DATE_EPOCH}" && compress="$compress --threads=0" ;; bzip2|lzma|lzop) # no parameters needed ;; *) echo "W: Unknown compression command ${compress}" >&2 ;; esac if [ -d "${outfile}" ]; then echo "${outfile} is a directory" >&2 exit 1 fi MODULESDIR="/lib/modules/${version}" if [ ! -e "${MODULESDIR}" ]; then echo "W: missing ${MODULESDIR}" >&2 echo "W: Ensure all necessary drivers are built into the linux image!" >&2 fi if [ ! -e "${MODULESDIR}/modules.dep" ]; then depmod "${version}" fi # Prepare to clean up temporary files on exit DESTDIR= __TMPCPIOGZ= __TMPEARLYCPIO= clean_on_exit() { if [ "${keep}" = "y" ]; then echo "Working files in ${DESTDIR:-}, early initramfs in ${__TMPEARLYCPIO:-} and overlay in ${__TMPCPIOGZ:-}" else for path in "${DESTDIR}" "${__TMPCPIOGZ}" "${__TMPEARLYCPIO}"; do test -z "${path}" || rm -rf "${path}" done fi } trap clean_on_exit EXIT trap "exit 1" INT TERM # makes the EXIT trap effective even when killed # Create temporary directory and files for initramfs contents [ -n "${TMPDIR}" ] && [ ! -w "${TMPDIR}" ] && unset TMPDIR DESTDIR="$(mktemp -d "${TMPDIR:-/var/tmp}/mkinitramfs_XXXXXX")" || exit 1 chmod 755 "${DESTDIR}" __TMPCPIOGZ="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-OL_XXXXXX")" || exit 1 __TMPEARLYCPIO="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-FW_XXXXXX")" || exit 1 DPKG_ARCH=$(dpkg --print-architecture) # Export environment for hook scripts. # export MODULESDIR export version export CONFDIR export DESTDIR export DPKG_ARCH export verbose export MODULES export BUSYBOX export COMPCACHE_SIZE export RESUME # Private, used by 'catenate_cpiogz'. export __TMPCPIOGZ # Private, used by 'prepend_earlyinitramfs'. export __TMPEARLYCPIO # Create usr-merged filesystem layout, to avoid duplicates if the host # filesystem is usr-merged. for d in /bin /lib* /sbin; do mkdir -p "${DESTDIR}/usr${d}" ln -s "usr${d}" "${DESTDIR}${d}" done for d in conf/conf.d etc run scripts ${MODULESDIR}; do mkdir -p "${DESTDIR}/${d}" done # Copy in modules.builtin and modules.order (not generated by depmod) # and modules.builtin.bin (generated by depmod, but too late to avoid # error messages as in #948257) for x in modules.builtin modules.builtin.bin modules.order; do if [ -f "${MODULESDIR}/${x}" ]; then cp -p "${MODULESDIR}/${x}" "${DESTDIR}${MODULESDIR}/${x}" fi done # MODULES=list case. Always honour. for x in "${CONFDIR}/modules" /usr/share/initramfs-tools/modules.d/*; do if [ -f "${x}" ]; then add_modules_from_file "${x}" fi done # MODULES=most is default case "${MODULES}" in dep) dep_add_modules ;; most) auto_add_modules ;; netboot) auto_add_modules base auto_add_modules net ;; list) # nothing to add ;; *) echo "W: mkinitramfs: unsupported MODULES setting: ${MODULES}." >&2 echo "W: mkinitramfs: Falling back to MODULES=most." >&2 auto_add_modules ;; esac # Resolve hidden dependencies hidden_dep_add_modules # First file executed by linux cp -p /usr/share/initramfs-tools/init "${DESTDIR}/init" # add existant boot scripts for b in $(cd /usr/share/initramfs-tools/scripts/ && find . \ -regextype posix-extended -regex '.*/[[:alnum:]\._-]+$' -type f); do option=$(sed '/^OPTION=/!d;$d;s/^OPTION=//;s/[[:space:]]*$//' "/usr/share/initramfs-tools/scripts/${b}") # shellcheck disable=SC1083,SC2086 [ -z "$option" ] || eval test -n \"\${$option}\" -a \"\${$option}\" != \"n\" || continue [ -d "${DESTDIR}/scripts/$(dirname "${b}")" ] \ || mkdir -p "${DESTDIR}/scripts/$(dirname "${b}")" cp -p "/usr/share/initramfs-tools/scripts/${b}" \ "${DESTDIR}/scripts/$(dirname "${b}")/" done # Prune dot-files/directories and limit depth to exclude VCS files for b in $(cd "${CONFDIR}/scripts" && find . -maxdepth 2 -name '.?*' -prune -o \ -regextype posix-extended -regex '.*/[[:alnum:]\._-]+$' -type f -print); do option=$(sed '/^OPTION=/!d;$d;s/^OPTION=//;s/[[:space:]]*$//' "${CONFDIR}/scripts/${b}") # shellcheck disable=SC1083,SC2086 [ -z "$option" ] || eval test -n \"\${$option}\" -a \"\${$option}\" != \"n\" || continue [ -d "${DESTDIR}/scripts/$(dirname "${b}")" ] \ || mkdir -p "${DESTDIR}/scripts/$(dirname "${b}")" cp -p "${CONFDIR}/scripts/${b}" "${DESTDIR}/scripts/$(dirname "${b}")/" done echo "DPKG_ARCH=${DPKG_ARCH}" > "${DESTDIR}/conf/arch.conf" cp -p "${CONFDIR}/initramfs.conf" "${DESTDIR}/conf" for i in ${EXTRA_CONF}; do copy_file config "${i}" /conf/conf.d done # ROOT hardcoding if [ -n "${ROOT:-}" ]; then echo "ROOT=${ROOT}" > "${DESTDIR}/conf/conf.d/root" fi if ! command -v ldd >/dev/null 2>&1 ; then echo "E: no ldd around - install libc-bin" >&2 exit 1 fi # fstab and mtab touch "${DESTDIR}/etc/fstab" ln -s /proc/mounts "${DESTDIR}/etc/mtab" # install wait-for-root binary. copy_exec /usr/lib/initramfs-tools/bin/wait-for-root /sbin # module-init-tools copy_exec /sbin/modprobe /sbin copy_exec /sbin/rmmod /sbin mkdir -p "${DESTDIR}/etc/modprobe.d" "${DESTDIR}/lib/modprobe.d" for file in /etc/modprobe.d/*.conf /lib/modprobe.d/*.conf ; do if test -e "$file" || test -L "$file" ; then copy_file config "$file" fi done run_scripts_optional /usr/share/initramfs-tools/hooks run_scripts_optional "${CONFDIR}"/hooks # cache boot run order for b in $(cd "${DESTDIR}/scripts" && find . -mindepth 1 -type d); do cache_run_scripts "${DESTDIR}" "/scripts/${b#./}" done # generate module deps depmod -a -b "${DESTDIR}" "${version}" rm -f "${DESTDIR}/lib/modules/${version}"/modules.*map # make sure that library search path is up to date cp -pPr /etc/ld.so.conf* "$DESTDIR"/etc/ if ! ldconfig -r "$DESTDIR" ; then [ "$(id -u)" != "0" ] \ && echo "ldconfig might need uid=0 (root) for chroot()" >&2 fi # The auxiliary cache is not reproducible and is always invalid at boot # (see #845034) if [ -d "${DESTDIR}"/var/cache/ldconfig ]; then rm -f "${DESTDIR}"/var/cache/ldconfig/aux-cache rmdir --ignore-fail-on-non-empty "${DESTDIR}"/var/cache/ldconfig fi # Apply DSDT to initramfs if [ -e "${CONFDIR}/DSDT.aml" ]; then copy_file DSDT "${CONFDIR}/DSDT.aml" fi case "${MODULES}" in netboot|most) add_dns "${DESTDIR}/";; esac # Remove any looping or broken symbolic links, since they break cpio. [ "${verbose}" = y ] && xargs_verbose="-t" (cd "${DESTDIR}" && find . -type l -printf '%p %Y\n' | sed -n 's/ [LN]$//p' \ | xargs ${xargs_verbose:-} -rL1 rm -f) [ "${verbose}" = y ] && echo "Building cpio ${outfile} initramfs" if [ -s "${__TMPEARLYCPIO}" ]; then cat "${__TMPEARLYCPIO}" >"${outfile}" || exit 1 else # truncate true > "${outfile}" fi ( # preserve permissions if root builds the image, see #633582 [ "$(id -ru)" != 0 ] && cpio_owner_root="-R 0:0" # if SOURCE_DATE_EPOCH is set, try and create a reproducible image if [ -n "${SOURCE_DATE_EPOCH}" ]; then # ensure that no timestamps are newer than $SOURCE_DATE_EPOCH find "${DESTDIR}" -newermt "@${SOURCE_DATE_EPOCH}" -print0 | \ xargs -0r touch --no-dereference --date="@${SOURCE_DATE_EPOCH}" # --reproducible requires cpio >= 2.12 cpio_reproducible="--reproducible" fi # work around lack of "set -o pipefail" for the following pipe: # cd "${DESTDIR}" && find . | LC_ALL=C sort | cpio --quiet $cpio_owner_root $cpio_reproducible -o -H newc | gzip >>"${outfile}" || exit 1 ec1=1 ec2=1 ec3=1 exec 3>&1 eval "$( # http://cfaj.freeshell.org/shell/cus-faq-2.html exec 4>&1 >&3 3>&- cd "${DESTDIR}" { find . 4>&-; echo "ec1=$?;" >&4 } | { LC_ALL=C sort } | { # shellcheck disable=SC2086 cpio --quiet $cpio_owner_root $cpio_reproducible -o -H newc 4>&-; echo "ec2=$?;" >&4 } | ${compress} >>"${outfile}" echo "ec3=$?;" >&4 )" if [ "$ec1" -ne 0 ]; then echo "E: mkinitramfs failure find $ec1 cpio $ec2 $compress $ec3" >&2 exit "$ec1" fi if [ "$ec2" -ne 0 ]; then echo "E: mkinitramfs failure cpio $ec2 $compress $ec3" >&2 exit "$ec2" fi if [ "$ec3" -ne 0 ]; then echo "E: mkinitramfs failure $compress $ec3" >&2 exit "$ec3" fi ) || exit 1 if [ -s "${__TMPCPIOGZ}" ]; then cat "${__TMPCPIOGZ}" >>"${outfile}" || exit 1 fi exit 0