This file is indexed.

/lib/partman/init.d/03kernelmodules_xfs 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

mkdir -p /var/lib/partman

cat /proc/modules |
while read module_name x; do
	if [ "$module_name" = xfs ]; then
		>/var/lib/partman/xfs
		exit 0
	fi
done

if modprobe xfs >/dev/null 2>/dev/null; then
	>/var/lib/partman/xfs
	exit 0
fi

if grep -q xfs /proc/filesystems; then
	>/var/lib/partman/xfs
fi