#!/bin/sh

# Installed as /sbin/init on DFS CD

initrdloc=/initrd
newrdloc=/opt/dfsruntime/runtimemnt
newrdfiles=/opt/dfsruntime/runtimerd

cleanup_union()
{
    while read to; do
        umount "$to"
    done < /opt/dfsruntime/binds
}

do_ramdisk_aufs()
{
    while read to; do
        mkdir -p "$newrdloc"/"$to"
        chown --reference "$to" "$newrdloc"/"$to"
        chmod --reference "$to" "$newrdloc"/"$to"
        mount -n -t aufs -o br:"$newrdloc"/"$to":"$to" none "$to" || { cleanup_union; return 1; }
    done < /opt/dfsruntime/binds
}

do_ramdisk_unionfs()
{
    while read to; do
        mkdir -p "$newrdloc"/"$to"
        chown --reference "$to" "$newrdloc"/"$to"
        chmod --reference "$to" "$newrdloc"/"$to"
        mount -n -t unionfs -o dirs="$newrdloc"/"$to":"$to" none "$to" || { cleanup_union; return 1; }
    done < /opt/dfsruntime/binds
}

do_ramdisk_copy()
{
    while read to; do
        cp -a "$to" "$newrdloc"/
        mount -n --bind "$newrdloc"/"$to" "$to"
    done < /opt/dfsruntime/binds
}

if [ -f $newrdloc/etc/fstab ] ; then
    echo " *** DFS startup: system already running, calling real init"
    exec /sbin/init.real "$@"
    return 1
fi

echo ""
echo " *** Debian From Scratch CD initializing ***"
echo "PID: $$"
cd /

echo -n "Creating new runtime ramdisk: "
mount -n -t tmpfs none $newrdloc
echo $newrdloc

echo -n "Populating runtime ramdisk: "
do_ramdisk_aufs || do_ramdisk_unionfs || do_ramdisk_copy
echo "done."

echo -n "Initializing configuration files: /etc/fstab"
echo "proc  /proc   proc    defaults        0 0" > /etc/fstab
echo "."

echo ""
echo " *** Now booting system ***"
exec /sbin/init.real "$@"