Replace unionfs with aufs

    echo "-d         Add the package to a local db at /repo after building"

    echo "-r <dir>   The chroot shell to use"

    echo "-I <pkg>   Install a package into the rw layer of the chroot"

    echo "-l <layer> The directory to use as the rw layer of the unionfs"

    echo "-l <layer> The directory to use as the rw layer of the union"

    echo "           Useful for maintain multiple layers. Default: rw"

    exit 1

}

uniondir="$chrootdir/union"

echo "building union chroot"

grep -Fq unionfs /proc/filesystems

grep -Fq aufs /proc/filesystems

if [ $? -ne 0 ]; then

    modprobe -q unionfs

    modprobe -q aufs

    if [ $? -ne 0 ]; then

        echo "ERROR: No unionfs available. Abandon ship!" && exit 1

        echo "ERROR: No aufs available. Abandon ship!" && exit 1

    fi

fi

mount -t unionfs none -o "dirs=$chrootdir/$LAYER=rw:$chrootdir/root=ro" "$uniondir"

mount -t aufs none -o "dirs=$chrootdir/$LAYER=rw:$chrootdir/root=ro" "$uniondir"

trap 'cleanup' 0 1 2 15

if [ -n "$install_pkg" ]; then