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# args: source, mountpoint
_mnt_bind()
{
    msg "::: Binding ${1} to ${2}"
    mkdir -p /real_root${2}
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    /bin/mount -o bind ${1} /real_root${2}
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}

# args: image file
_mnt_squashfs()
{
    msg "::: Adding new union branch: ${1}"
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    /bin/modprobe -q loop >/dev/null 2>&1
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    mkdir -p "/tmpfs/mnt/loop${LOOP_NUM}"
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    # sometimes it takes udev a while to create device nodes
    until [ -e "/dev/loop${LOOP_NUM}" ]; do
        sleep 1
    done
    if ! /bin/losetup "/dev/loop${LOOP_NUM}" ${1}; then
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        echo "ERROR: Cannot mount loop device /dev/loop${LOOP_NUM}"
        break
    fi
    /bin/mount -r -t squashfs "/dev/loop${LOOP_NUM}" "/tmpfs/mnt/loop${LOOP_NUM}"
    /bin/mount -t unionfs -o remount,add=:/tmpfs/mnt/loop${LOOP_NUM}=ro none "/real_root"
    export LOOP_NUM=$(( $LOOP_NUM + 1 ))
}

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run_hook ()
{
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    if [ "x${arch}" = "x" ]; then
        arch="$(uname -m)"
    fi

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    if [ "x${ramdisk_size}" = "x" ]; then
        ramdisk_size="75%"
    fi
    msg -n ":: Mounting tmpfs, size=${ramdisk_size}..."
	mount -t tmpfs -o "size=${ramdisk_size}" tmpfs /tmpfs
    msg "done."

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    # external drives may need to settle
    msg ":: Waiting for usb devices to settle..."
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    /sbin/udevadm trigger --subsystem-match=usb
    /sbin/udevadm settle
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    msg ":: Scanning for boot device..."

    /bin/mkdir -p /bootmnt
    bootmnt="/bootmnt"
    found=0

    /bin/modprobe -q isofs >/dev/null 2>&1
    msg ":: Scanning cd drives..."
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    for cdrom in /dev/hd[a-z] /dev/sr[0-9]* /dev/scd[a-z] /dev/sg[0-9]*; do
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        if mount -r -t iso9660 "${cdrom}" ${bootmnt} >/dev/null 2>&1; then
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            if [ -e "${bootmnt}/isomounts" ]; then
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                found=1
                msg "${cdrom}"
                break
            fi
        else
            echo "Failed to mount ${cdrom}"
        fi
        [ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
    done

    if [ ${found} -eq 0 ]; then
        msg ":: Scanning usb drives..."
        for usb in /dev/sd[a-z][0-9]; do
            if mount -r -t vfat "${usb}" ${bootmnt} >/dev/null 2>&1 ||\
                mount -r -t ext2 "${usb}" ${bootmnt} >/dev/null 2>&1; then
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                if [ -e "${bootmnt}/isomounts" ]; then
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                    found=1
                    msg "${usb}"
                    break
                fi
            else
                echo "Failed to mount ${usb}"
            fi
            [ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
        done
    fi

    if [ ${found} -eq 0 ]; then
        echo "ERROR: cannot find boot device, cannot continue..."
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        echo "   Falling back to interactive prompt"
        PS1="ramfs$ " /bin/sh -i
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        exit 1
    fi

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    base_img="${bootmnt}/root-image.sqfs"
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    if [ "${copytoram}" = "y" ]; then
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        msg ":: Copying squashfs image to RAM"
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        /bin/cat ${base_img} > /tmpfs/root-image.sqfs
        base_img="/tmpfs/root-image.sqfs"
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    fi
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    /bin/modprobe -q squashfs >/dev/null 2>&1

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    msg ":: Mounting root (union) filesystem"
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    /bin/modprobe -q unionfs >/dev/null 2>&1
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    /bin/mount -t unionfs -o dirs=/tmpfs=rw none /real_root
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    export LOOP_NUM="0"
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    if [ -e "/isomounts" ]; then
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        msg ":: Mounting images"
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        while read img imgarch mountpoint type; do
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            # check if this line is a comment (starts with #)
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            [ "${img#"#"}" != "${img}" ] && continue
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            [ "$imgarch" != "$arch" ] && continue

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            if [ "${type}" = "bind" ]; then
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                _mnt_bind ${img} ${mountpoint}
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            elif [ "${type}" = "squashfs" ]; then
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                _mnt_squashfs "${img}"
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            fi
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        done < /isomounts
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    else
        msg ":: No mountable images found"
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    fi

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    # layer the "pristine" base system image last
    _mnt_squashfs ${base_img}
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    if [ -d /proc/sys/dev/cdrom ]; then
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        echo 0 > /proc/sys/dev/cdrom/lock
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        echo 0 > /proc/sys/dev/cdrom/autoeject
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    fi

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    if [ "${break}" = "y" ]; then
        echo ":: Break requested, type 'exit' to resume operation"
        echo "   NOTE: klibc contains no 'ls' binary, use 'echo *' instead"
        PS1="ramfs$ " /bin/sh -i
    fi

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    udevpid=$(/bin/minips -C udevd -o pid=)
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    [ "x${udevpid}" != "x" ] && /bin/kill -9 $udevpid 2>&1 >/dev/null
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    #Yep, we're bailing out here.  We don't need kinit.
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    msg ":: Passing control to Archlinux Initscripts...Please Wait"
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    /bin/umount /sys
    /bin/umount /proc
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    exec /bin/run-init -c /dev/console /real_root /sbin/init ${CMDLINE}
}
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# vim:ft=sh:ts=4:sw=4:et: