#!/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.
-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: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
echo "No ${compress} in ${PATH}, using gzip"
compress=gzip
fi
case "${compress}" in
gzip) # If we're doing a reproducible build, use gzip -n
if [ -n "${SOURCE_DATE_EPOCH}" ]; then
compress="gzip -n"
# Otherwise, substitute pigz if it's available
elif command -v pigz >/dev/null; then
compress=pigz
fi
;;
lz4) compress="lz4 -2 -l" ;;
zstd) compress="zstd -q -1 -T0" ;;
xz) compress="xz --check=crc32"
# If we're not doing a reproducible build, enable multithreading
test -z "${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 "${version}"
fi
# Prepare to clean up temporary files on exit
DESTDIR=
__TMPCPIOGZ=
__TMPMAINCPIO=
__TMPEARLYCPIO=
clean_on_exit() {
if [ "${keep}" = "y" ]; then
echo "Working files in ${DESTDIR:-<not yet created>}," \
"early initramfs in ${__TMPEARLYCPIO:-<not yet created>}," \
"main initramfs in ${__TMPMAINCPIO:-<not yet created>} and" \
"overlay in ${__TMPCPIOGZ:-<not yet created>}"
else
for path in "${DESTDIR}" "${__TMPCPIOGZ}" "${__TMPMAINCPIO}" "${__TMPEARLYCPIO}"; do
test -z "${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
__TMPMAINCPIO="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-MAIN_XXXXXX")" || exit 1
__TMPEARLYCPIO="$(mktemp "${TMPDIR:-/var/tmp}/mkinitramfs-FW_XXXXXX")" || exit 1
DPKG_ARCH=$(dpkg --print-architecture)
# Export environment for hook scripts.
#
export MODULESDIR
export version
export CONFDIR
export DESTDIR
export DPKG_ARCH
export verbose
export MODULES
export BUSYBOX
export RESUME
export FSTYPE
# Private, used by 'catenate_cpiogz'.
export __TMPCPIOGZ
# Private, used by 'prepend_earlyinitramfs'.
export __TMPEARLYCPIO
# Create usr-merged filesystem layout, to avoid duplicates if the host
# filesystem is usr-merged.
for d in /bin /lib* /sbin; do
mkdir -p "${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: ${MODULES}." >&2
echo "W: mkinitramfs: Falling back to MODULES=most." >&2
auto_add_modules
;;
esac
# Resolve hidden dependencies
hidden_dep_add_modules
# Add firmware for built-in code
add_builtin_firmware
# First file executed by linux
cp -p /usr/share/initramfs-tools/init "${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
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
# decompress modules for boot speed, if possible
find "${DESTDIR}/${MODULESDIR}" -name '*.ko.*' | while read -r ko; do
case "$ko" in
*.xz)
if ! command -v xz >/dev/null 2>&1; then
break
fi
xz -d "${ko}"
;;
*.zst)
if ! command -v zstd >/dev/null 2>&1; then
break
fi
zstd -q -d --rm "${ko}"
;;
esac
done
# generate module deps
depmod -a -b "${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 ${outfile} initramfs"
(
# preserve permissions if root builds the image, see #633582
[ "$(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 $cpio_reproducible -o -H newc >>"${outfile}" || exit 1
ec1=1
ec2=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 $cpio_reproducible -o -H newc 4>&- >"${__TMPMAINCPIO}"
echo "ec2=$?;" >&4
}
)"
if [ "$ec1" -ne 0 ]; then
echo "E: mkinitramfs failure find $ec1 cpio $ec2" >&2
exit "$ec1"
fi
if [ "$ec2" -ne 0 ]; then
echo "E: mkinitramfs failure cpio $ec2" >&2
exit "$ec2"
fi
) || exit 1
{
if [ -s "${__TMPEARLYCPIO}" ]; then
cat "${__TMPEARLYCPIO}" || exit 1
fi
$compress -c "${__TMPMAINCPIO}" ||
{ echo "E: mkinitramfs failure $compress $?" >&2; exit 1; }
if [ -s "${__TMPCPIOGZ}" ]; then
cat "${__TMPCPIOGZ}" || exit 1
fi
} >"${outfile}" || exit 1
exit 0
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