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/lib/partman/check.d/10check_basicfilesystems is in ubiquity 2.18.7.

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The actual contents of the file can be viewed below.

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#!/bin/sh

. /lib/partman/lib/base.sh

for dev in $DEVICES/*; do
	[ -d "$dev" ] || continue
	cd $dev
	partitions=
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		[ "$fs" != free ] || continue
		partitions="$partitions $id,$num"
	done
	close_dialog

	for part in $partitions; do
		id=${part%,*}
		num=${part#*,}
		[ -f $id/method -a ! -f $id/format \
		  -a -f $id/acting_filesystem ] || continue
		filesystem=$(cat $id/acting_filesystem)
		case $filesystem in
		    fat16|fat32)
			log "Check the file system in $dev/$id"
			template=partman-basicfilesystems/progress_checking
			RET=''
			db_metaget  partman/filesystem_short/"$filesystem" description || RET=''
			[ "$RET" ] || RET="$filesystem"
			db_subst $template TYPE "$RET"
			db_subst $template PARTITION "$num"
			db_subst $template DEVICE $(humandev $(cat device))
			name_progress_bar $template
			open_dialog CHECK_FILE_SYSTEM $id
			read_line status
			close_dialog
			if [ "$status" != good ]; then
				db_subst partman-basicfilesystems/check_failed TYPE "$filesystem"
				db_subst partman-basicfilesystems/check_failed PARTITION "$num"
				db_subst partman-basicfilesystems/check_failed DEVICE $(humandev $(cat device))
				db_set partman-basicfilesystems/check_failed true
				db_input critical partman-basicfilesystems/check_failed || true
				db_go || true
				db_get partman-basicfilesystems/check_failed
				if [ "$RET" = true ]; then
					exit 1
				fi
			fi
			;;
		esac
	done
done