#!/bin/sh -e

out=$1
shift

[ -n "$out" ] || {
    echo "Usage: mkinitfs outfile" >&2
    exit 1
}

exit_handler()
{
    local rc=$?
    trap - EXIT
    [ $rc -eq 0 ] || rm -f -- $out
    exit $rc
}

trap exit_handler HUP PIPE INT TERM QUIT EXIT

(

cat <<EOF
dir	/dev 		0755	0 0
dir	/image		0755	0 0
dir	/proc		0755	0 0
dir	/sys		0755	0 0
dir	/root		0755	0 0
dir	/tmp		0755	0 0
dir	/var		0755	0 0
dir	/var/lock	0755	0 0

dir	/etc		0755	0 0
dir	/etc/modprobe.d	0755	0 0

dir	/etc/terminfo	0755	0 0
dir	/etc/terminfo/l	0755	0 0
file	/etc/terminfo/l/linux	/lib/terminfo/l/linux	0644	0 0

dir	/etc/udev	0755	0 0
dir	/etc/udev/rules.d	0755	0 0

dir	/lib		0755	0 0
dir	/lib/udev	0755	0 0

dir	/bin		0755	0 0
file	/bin/sh		/lib/mkinitrd/busybox	0755	0 0

dir	/sbin		0755	0 0
file	/sbin/modprobe	/lib/mkinitrd/module-init-tools/sbin/modprobe	0755	0 0
file	/sbin/stage1	stage1	0755	0 0

file	/init		init	0755	0 0
EOF

find /lib/mkinitrd/klibc/lib -xtype f|\
    sed -e 's,/lib/mkinitrd/klibc,,' -e 's,^.\+$,file\t&\t/lib/mkinitrd/klibc&\t0755\t0 0,g'
find /lib/mkinitrd/udev -type f|\
    sed -e 's,/lib/mkinitrd/udev,,' -e 's,^.\+$,file\t&\t/lib/mkinitrd/udev&\t0755\t0 0,g'
find /etc/modprobe.d/ /etc/udev/rules.d -type f|\
    sed -e 's,^.\+$,file\t&\t&\t0644\t0 0,g'
) | `pwd`/gencpio - |gzip -c > $out