This file is indexed.

/usr/share/initramfs-tools/hooks/cryptroot-unlock is in cryptsetup 2:1.7.3-4.

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

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case "$1" in
prereqs)
	 prereqs
	 exit 0
	;;
esac

cp -p /usr/share/cryptsetup/initramfs/bin/cryptroot-unlock "$DESTDIR/bin/cryptroot-unlock"

if [ -f /etc/initramfs-tools/etc/motd ]; then
	cp /etc/initramfs-tools/etc/motd "$DESTDIR/etc/motd"
else
	cat >>"$DESTDIR/etc/motd" <<- EOF
		To unlock root partition, and maybe others like swap, run \`cryptroot-unlock\`
	EOF
fi