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#!/bin/sh umask 0022 export PATH='/usr/bin:/sbin:/bin' # Defaults keep="n" CONFDIR="/etc/initramfs-tools" verbose="n" # Will be updated by busybox's conf hook, if present BUSYBOXDIR= export BUSYBOXDIR usage() { cat << EOF Usage: mkinitramfs [option]... -o outfile [version] Options: -c compress Override COMPRESS setting in initramfs.conf. -d confdir Specify an alternative configuration directory. -l level Override COMPRESSLEVEL setting in initramfs.conf. -k Keep temporary directory used to make the image. -o outfile Write to outfile. -r root Override ROOT setting in initramfs.conf. See mkinitramfs(8) for further details. EOF } usage_error() { usage >&2 exit 2 } OPTIONS=$(getopt -o c:d:hl:ko: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 ;; -l) compresslevel="$2" shift 2 ;; -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 echo "W: No ${compress} in ${PATH}, using gzip" >&2 compress=gzip fi # Check that kernel supports selected compressor, and fall back to gzip. # Exit if even gzip is not supported. case "${compress}" in gzip) kconfig_sym=CONFIG_RD_GZIP ;; bzip2) kconfig_sym=CONFIG_RD_BZIP2 ;; lzma) kconfig_sym=CONFIG_RD_LZMA ;; xz) kconfig_sym=CONFIG_RD_XZ ;; lzop) kconfig_sym=CONFIG_RD_LZO ;; lz4) kconfig_sym=CONFIG_RD_LZ4 ;; zstd) kconfig_sym=CONFIG_RD_ZSTD ;; esac if [ -e "/boot/config-${version}" ]; then while ! grep -q "^$kconfig_sym=y" "/boot/config-${version}"; do if [ "${compress}" = gzip ]; then echo "E: gzip compression ($kconfig_sym) not supported by kernel" >&2 exit 1 fi echo "W: ${compress} compression ($kconfig_sym) not supported by kernel, using gzip" >&2 compress=gzip kconfig_sym=CONFIG_RD_GZIP done else echo "W: Kernel configuration /boot/config-${version} is missing," \ "cannot check for ${compress} compression support ($kconfig_sym)" >&2 fi if [ -z "${compresslevel:-}" ]; then compresslevel=${COMPRESSLEVEL:-} fi case "${compress}" in lz4) compresslevel="-${compresslevel:-2}" ;; zstd) compresslevel="-${compresslevel:-1}" ;; #gzip|xz|bzip2|lzma|lzop included *) # We're not using a compression level by default compresslevel="${compresslevel:+-${compresslevel}}" ;; esac unset COMPRESSLEVEL case "${compress}" in gzip) # If we're doing a reproducible build, use gzip -n if [ -n "${SOURCE_DATE_EPOCH}" ]; then compress="gzip -n" # Otherwise, substitute pigz if it's available elif command -v pigz >/dev/null; then compress=pigz fi if [ -n "${compresslevel}" ]; then compress="${compress} ${compresslevel}" fi ;; lz4) compress="lz4 ${compresslevel} -l" ;; zstd) compress="zstd -q ${compresslevel}" # If we're not doing a reproducible build, enable multithreading test -z "${SOURCE_DATE_EPOCH}" && compress="$compress -T0" ;; xz) compress="xz ${compresslevel} --check=crc32" # If we're not doing a reproducible build, enable multithreading test -z "${SOURCE_DATE_EPOCH}" && compress="$compress --threads=0" ;; bzip2|lzma|lzop) compress="${compress} ${compresslevel}" ;; *) 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 "${version}" fi # Prepare to clean up temporary files on exit DESTDIR= __TMPMAINFILES= __TMPUNCOMPRESSEDFILES= __TMPCPIOGZ= __TMPEARLYCPIO= __MODULES_TO_ADD= # shellcheck disable=SC2317 clean_on_exit() { if [ "${keep}" = "y" ]; then echo "Working files in ${DESTDIR:-<not yet created>}," \ "list of files for main initramfs in ${__TMPMAINFILES:-<not yet created>}," \ "list of files for uncompressed initramfs in ${__TMPUNCOMPRESSEDFILES:-<not yet created>}," \ "early initramfs in ${__TMPEARLYCPIO:-<not yet created>} and" \ "overlay in ${__TMPCPIOGZ:-<not yet created>}" else for path in "${DESTDIR}" "${__TMPMAINFILES}" "${__TMPUNCOMPRESSEDFILES}" "${__TMPCPIOGZ}" "${__TMPEARLYCPIO}" "${__MODULES_TO_ADD}"; do test -z "${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}" __TMPMAINFILES="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-MAIN_files_XXXXXX")" || exit 1 __TMPUNCOMPRESSEDFILES="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-UNCOMPRESSED_files_XXXXXX")" || exit 1 __TMPCPIOGZ="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-OL_XXXXXX")" || exit 1 __TMPEARLYCPIO="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-FW_XXXXXX")" || exit 1 __MODULES_TO_ADD="$(mktemp "${TMPDIR:-/var/tmp}/modules_XXXXXX")" || exit 1 DPKG_ARCH=$(dpkg --print-architecture) # Export environment for hook scripts. # export MODULESDIR export version export CONFDIR export DESTDIR export DPKG_ARCH export verbose export MODULES export BUSYBOX export RESUME export FSTYPE # Private, used by 'catenate_cpiogz'. export __TMPCPIOGZ # Private, used by 'prepend_earlyinitramfs'. export __TMPEARLYCPIO # Private, used by 'manual_add_modules'. export __MODULES_TO_ADD # Create usr-merged filesystem layout, to avoid duplicates if the host # filesystem is usr-merged. for d in /bin /lib* /sbin; do mkdir -p "${DESTDIR}/usr${d}" ln -s "usr${d}" "${DESTDIR}${d}" done for d in conf/conf.d etc run scripts ${MODULESDIR}; do mkdir -p "${DESTDIR}/${d}" done # Copy in modules.builtin, modules.builtin.modinfo and modules.order (not generated by depmod) # and modules.builtin.bin (generated by depmod, but too late to avoid # error messages as in #948257) for x in modules.builtin modules.builtin.bin modules.builtin.modinfo modules.order; do if [ -f "${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: ${MODULES}." >&2 echo "W: mkinitramfs: Falling back to MODULES=most." >&2 auto_add_modules ;; esac # Add firmware for built-in code add_builtin_firmware # First file executed by linux cp -p /usr/share/initramfs-tools/init "${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 "${DESTDIR}/etc/mtab" # Install libc6, pthreads, and dlopened gcc_s.so.1 (Debian bug #950254) LP: #1880853 LP: #1958594 copy_exec /usr/lib/initramfs-tools/bin/gcc_s1-stub /usr/lib/initramfs-tools/bin/gcc_s1-stub # install wait-for-root binary. copy_exec /usr/lib/initramfs-tools/bin/wait-for-root /sbin # module-init-tools copy_exec /sbin/modprobe /sbin copy_exec /sbin/rmmod /sbin mkdir -p "${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 export STAGE_KERNEL_MODULE_COPYING=1 run_scripts_optional /usr/share/initramfs-tools/hooks unset STAGE_KERNEL_MODULE_COPYING apply_add_modules 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 # Resolve hidden dependencies hidden_dep_add_modules # 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. [ "${verbose}" = y ] && xargs_verbose="-t" # shellcheck disable=SC2086 (cd "${DESTDIR}" && find . -type l -printf '%p %Y\n' | sed -n 's/ [LN]$//p' \ | xargs ${xargs_verbose:-} -rL1 rm -f) [ "${verbose}" = y ] && echo "Building cpio ${outfile} initramfs" # preserve permissions if root builds the image, see #633582 [ "$(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 # Read list of files and echo them plus all leading directories. # The same directories might be printed multiple times (even with sorted input)! add_directories() { local last_dir path dir while read -r path; do dir="${path%/*}" parent="${dir}" while [ "$parent" != "$last_dir" ] && [ "$parent" != "." ]; do echo "$parent" parent="${parent%/*}" done last_dir="$dir" echo "$path" done if [ -n "$last_dir" ]; then echo "." fi } cd "${DESTDIR}" || exit 1 # work around lack of "set -o pipefail" for pipes. # Write exit code to FD 3 in case of a failure to pass it through the pipes. { { find . $ ! -type d ! -name '*.zst' ! -name '*.xz' $ -o $ -type d -empty $ || { echo "E: mkinitramfs failure main find $?" >&2; echo 1 >&3; exit; } } | add_directories | { LC_ALL=C sort || { echo "E: mkinitramfs failure sort $?" >&2; echo 1 >&3; exit; } } | uniq > "${__TMPMAINFILES}" || { echo "E: mkinitramfs failure uniq $?" >&2; echo 1 >&3; exit; } } 3>&1 | { read -r exit_code; exit "${exit_code:-0}"; } || exit $? { { find . -name '*.zst' -o -name '*.xz' || { echo "E: mkinitramfs failure uncompressed find $?" >&2; echo 1 >&3; exit; } } | add_directories | { LC_ALL=C sort || { echo "E: mkinitramfs failure sort $?" >&2; echo 1 >&3; exit; } } | uniq > "${__TMPUNCOMPRESSEDFILES}" || { echo "E: mkinitramfs failure uniq $?" >&2; echo 1 >&3; exit; } } 3>&1 | { read -r exit_code; exit "${exit_code:-0}"; } || exit $? { { if [ -s "${__TMPEARLYCPIO}" ]; then cat "${__TMPEARLYCPIO}" || { echo 1 >&3; exit; } fi if [ -s "${__TMPUNCOMPRESSEDFILES}" ]; then # shellcheck disable=SC2086 cpio --quiet $cpio_owner_root $cpio_reproducible -o -H newc -D "${DESTDIR}" <"${__TMPUNCOMPRESSEDFILES}" || { echo "E: mkinitramfs failure uncompressed cpio $?" >&2; echo 1 >&3; exit; } fi { # shellcheck disable=SC2086 cpio --quiet $cpio_owner_root $cpio_reproducible -o -H newc -D "${DESTDIR}" <"${__TMPMAINFILES}" || { echo "E: mkinitramfs failure cpio $?" >&2; echo 1 >&3; exit; } } | $compress -c || { echo "E: mkinitramfs failure $compress $?" >&2; echo 1 >&3; exit; } if [ -s "${__TMPCPIOGZ}" ]; then cat "${__TMPCPIOGZ}" || { echo 1 >&3; exit; } fi } >"${outfile}" || echo $? >&3 } 3>&1 | { read -r exit_code; exit "${exit_code:-0}"; } || exit $? exit 0