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/lib/partman/update.d/50filesystems is in ubiquity 2.21.63.

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#!/bin/sh

. /lib/partman/lib/base.sh

dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
name=$8

cd $dev

mkdir -p $id

if [ $fs = free ]; then
	rm -f $id/method
fi

if [ ! -f $id/method ] || [ ! -f $id/use_filesystem ]; then
	rm -f $id/acting_filesystem
	exit 0
fi

if [ -f $id/filesystem ]; then
	cp $id/filesystem $id/acting_filesystem
else
	rm -f $id/acting_filesystem
fi

open_dialog PARTITION_INFO $id
read_line num id size type fs path name
close_dialog

acting_filesystem=''
if [ -f $id/acting_filesystem ] && \
   acting_filesystem=$(cat $id/acting_filesystem) && \
   [ -f /lib/partman/parted_names/$acting_filesystem ] && \
   new_fs=$(cat /lib/partman/parted_names/$acting_filesystem) && \
   [ "$fs" != "$new_fs" ]; then
	open_dialog CHANGE_FILE_SYSTEM $id $new_fs
	close_dialog
fi

existing=no
formatable=no

for i in /lib/partman/valid_filesystems/*; do
	[ -x $i ] || continue
	if [ "$($i $dev $id existing)" = "$acting_filesystem" ]; then
		existing=yes
	fi
	if [ "$($i $dev $id formatable)" = "$acting_filesystem" ]; then
		formatable=yes
	fi
done

if [ $existing = yes ]; then
	> $dev/$id/existing
else
	rm -f $dev/$id/existing
fi

if [ $formatable = yes ]; then
	> $dev/$id/formatable
else
	rm -f $dev/$id/formatable
fi