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Filename : mkinitramfs
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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.
  -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 "${compress}" >/dev/null 2>&1; then
	compress=gzip
	[ "${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:-<not yet created>}, early initramfs in ${__TMPEARLYCPIO:-<not yet created>} and overlay in ${__TMPCPIOGZ:-<not yet created>}"
	else
		for path in "${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