#!/bin/sh

umask 0022

# Defaults
keep="n"
CONFDIR="/etc/initramfs-tools"
verbose="n"
errors_to="2>/dev/null"
# BUSYBOXDIR="/usr/lib/initramfs-tools/bin/"
BUSYBOXDIR="/bin" 

OPTIONS=`getopt -o d:ko:r:v -n "$0" -- "$@"`

# Check for non-GNU getopt
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

eval set -- "$OPTIONS"

while true; do
	case "$1" in
	-d)
		CONFDIR="$2"
		shift 2
		if [ ! -d "${CONFDIR}" ]; then
			echo "${0}: ${CONFDIR}: Not a directory" >&2
			exit 1
		fi
		;;
	-o)
		touch $2
		outfile="$(readlink -f "$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

. "${CONFDIR}/initramfs.conf"
EXTRA_CONF=''
for i in ${CONFDIR}/conf.d/* /usr/share/initramfs-tools/conf.d/*; do
       EXTRA_CONF="${EXTRA_CONF} $(basename $i | grep '^[a-z0-9][a-z0-9\._-]*$' | grep -v '\.dpkg-.*$')";
done
for i in ${EXTRA_CONF}; do
. ${CONFDIR}/conf.d/${i}
done

if [ -z "${outfile}" ]; then
	usage
fi

# 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

if dpkg --compare-versions "${version}" lt 2.6.12; then
	echo "Kernel version too old.  initramfs-tools requires at least 2.6.12."
	exit 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 1
        ;;
esac

if [ -d "${outfile}" ]; then
	echo "${outfile} is a directory"
	exit 1
fi

MODULESDIR="/lib/modules/${version}"

if [ ! -e "${MODULESDIR}" ]; then
	echo "Cannot find ${MODULESDIR}"
	exit 1
fi
if [ ! -e "${MODULESDIR}/modules.depmod" ]; then
	depmod ${version}
fi

DESTDIR="$(mktemp -t -d mkinitramfs_XXXXXX)" || exit 1
__TMPCPIOGZ="$(mktemp -t mkinitramfs-OL_XXXXXX)" || exit 1

DPKG_ARCH=`dpkg --print-installation-architecture`

# Export environment for hook scripts.
#
export MODULESDIR
export version
export CONFDIR
export DESTDIR
export DPKG_ARCH
export verbose

# Private, used by 'catenate_cpiogz'.
export __TMPCPIOGZ

for d in bin conf/conf.d etc lib modules sbin scripts; do
    mkdir -p "${DESTDIR}/${d}"
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

if [ "${MODULES}" = "dep" ]; then
	dep_add_modules
fi

if [ "${MODULES}" = "most" ]; then
	auto_add_modules
fi

if [ "${MODULES}" = "netboot" ]; then
	auto_add_modules base
	auto_add_modules net
fi

# Have to do each file, because cpio --dereference doesn't recurse down
# symlinks.

ln -s /usr/lib/klibc/bin/* ${DESTDIR}/bin
ln -s /lib/klibc-*.so ${DESTDIR}/lib
copy_exec /usr/share/initramfs-tools/init /init
cp -a /usr/share/initramfs-tools/scripts/* "${DESTDIR}/scripts"
for f in $(cd ${CONFDIR}/scripts && \
	find . \( -name '*.dpkg*' -prune -o -name '*~' -prune \) \
		-o -type f -print); do
	mkdir --parents "${DESTDIR}/scripts/$(dirname "${f}")"
cp -p "${CONFDIR}/scripts/${f}" "${DESTDIR}/scripts/$(dirname "${f}")"
done
echo "DPKG_ARCH=${DPKG_ARCH}" > ${DESTDIR}/conf/arch.conf
copy_exec "${CONFDIR}/initramfs.conf" /conf
for i in ${EXTRA_CONF}; do
       copy_exec ${CONFDIR}/conf.d/${i} /conf/conf.d
done
echo "ROOT=${ROOT}" > ${DESTDIR}/conf/conf.d/root

# Busybox
if [ "x${BUSYBOX}" = "xn" ]; then
	ln -s ${DESTDIR}/bin/sh.shared ${DESTDIR}/bin/sh
	echo "Warning: Busybox is required for successful boot!"
else
	rm -f ${DESTDIR}/bin/sh
	copy_exec ${BUSYBOXDIR}/busybox /bin/busybox
	ln -s ${BUSYBOXDIR}/busybox ${DESTDIR}/bin/sh
fi

# Modutils
copy_exec /sbin/modprobe /sbin
copy_exec /sbin/depmod /sbin
copy_exec /sbin/rmmod /sbin
mkdir -p "${DESTDIR}/etc/modprobe.d"
cp -a /etc/modprobe.d/* "${DESTDIR}/etc/modprobe.d"

run_scripts /usr/share/initramfs-tools/hooks
run_scripts "${CONFDIR}"/hooks

# Apply DSDT to initramfs
if [ -e "${CONFDIR}/DSDT.aml" ]; then
	copy_exec "${CONFDIR}/DSDT.aml" /
fi

(cd "${DESTDIR}" && find . | cpio --quiet --dereference -o -H newc | gzip -9 >"${outfile}") || exit 1

if [ -s "${__TMPCPIOGZ}" ]; then
    cat "${__TMPCPIOGZ}" >>"${outfile}" || exit 1
fi

if [ "${keep}" = "y" ]; then
	echo "Working files in ${DESTDIR} and overlay in ${__TMPCPIOGZ}"
else
	rm -rf "${DESTDIR}"
	rm -rf "${__TMPCPIOGZ}"
fi

exit 0