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/lib/partman/mount.d/70bind is in ubiquity 2.10.16.

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#!/bin/sh
set -- $1

fs=$1
mp=$2
type=$3
options=$4
dump=$5
pass=$6

case "$options" in
    *bind*)
	mount -o "$options" $fs /target$mp || exit 1
        echo "umount /target$mp"
        exit 0
        ;;
esac

exit 1