#!/bin/sh

umask 0022

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

OPTIONS=`getopt -o d:ko:r: --long supported-host-version:,supported-target-version: -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)
		# ignore (FIXME: manpage says differently?!?)
		shift 2
		;;
	--supported-host-version)
		supported_host_version="$2"
		shift 2
		;;
	--supported-target-version)
		supported_target_version="$2"
		shift 2
		;;
	--)
		shift
		break
		;;
	*)
		echo "Internal error!" >&2
		exit 1
		;;
	esac
done

if [ -n "$supported_host_version" ] || [ -n "$supported_target_version" ]; then
	if [ -n "$supported_host_version" ]; then
		host_upstream_version="${supported_host_version%%-*}"
	fi
	if [ -n "$supported_target_version" ]; then
		target_upstream_version="${supported_target_version%%-*}"
		if dpkg --compare-versions "$target_upstream_version" lt "2.6.12"; then
			exit 2
		fi
	fi
	exit 0
fi

# For dependency ordered mkinitramfs hook scripts.
. /usr/share/initramfs-tools/scripts/functions
. /usr/share/initramfs-tools/hook-functions

. "${CONFDIR}/initramfs.conf"

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

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

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

# Private, used by 'catenate_cpiogz'.
export __TMPCPIOGZ

for d in bin conf 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

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

cp /usr/share/initramfs-tools/init "${DESTDIR}/init"
cp -a /usr/share/initramfs-tools/scripts/* "${DESTDIR}/scripts"
for f in $(cd /etc/mkinitramfs/scripts && \
	find . \( -name '*.dpkg*' -prune -o -name '*~' -prune \) \
		-o -type f -print); do
	mkdir --parents "${DESTDIR}/scripts/$(dirname "${f}")"
cp -p "/etc/mkinitramfs/scripts/${f}" "${DESTDIR}/scripts/$(dirname "${f}")"
done
cp "${CONFDIR}/initramfs.conf" "${DESTDIR}/conf"
cp -a /etc/udev "${DESTDIR}/etc"

# udev
cp /sbin/udev "${DESTDIR}/sbin"
cp /sbin/udevd "${DESTDIR}/sbin"
cp /sbin/udevsynthesize "${DESTDIR}/sbin"
cp -a /lib/hotplug "${DESTDIR}/lib"

# Busybox
cp "${BUSYBOXDIR}/busybox" "${DESTDIR}/bin/busybox"

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

run_scripts /usr/share/initramfs-tools/hooks
run_scripts /etc/mkinitramfs/hooks

mklibs-copy -d "${DESTDIR}/lib" --root="${DESTDIR}" $(find "${DESTDIR}" -type f -perm +0111 -o -name '*.so')

ln -s /usr/lib/klibc/bin/* "${DESTDIR}/bin"
ln -s /usr/lib/klibc/lib/* "${DESTDIR}/lib"

rm "${DESTDIR}/bin/sh"
ln -s busybox "${DESTDIR}/bin/sh"

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

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

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

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

exit 0