This file is indexed.

/lib/partman/choose_method/25filesystem/choices is in ubiquity 2.18.7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

. /usr/share/debconf/confmodule

dev=$1
id=$2

filesystems=$(
	for i in /lib/partman/valid_filesystems/*; do
		[ -x $i ] || continue
		( $i $dev $id existing
		  $i $dev $id formatable ) | sort -u
	done
)

allowed=$filesystems
for i in /lib/partman/veto_filesystems/*; do
	[ -x $i ] || continue
	allowed=$($i $dev $id "$allowed")
done

for fs in $allowed; do
	db_metaget partman/filesystem_long/$fs description || RET=''
	RET=${RET:-$fs}
	printf "${fs}\t${RET}\n"
done