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/bin/live-medium-cache is in live-tools 1:20171207.

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The actual contents of the file can be viewed below.

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#!/bin/sh

# live-tools(7) - System Support Scripts
# Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
#
# This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
# This is free software, and you are welcome to redistribute it
# under certain conditions; see COPYING for details.

set -e

# Exit if system is not a live system
if ! grep -qs "boot=live" /proc/cmdline || \
# Exit if system is toram
   grep -qs "toram" /proc/cmdline
then
	exit 0
fi

# Try to cache everything we're likely to need after ejecting.  This
# is fragile and simple-minded, but our options are limited.
cache_path()
{
	path="${1}"

	if [ -d "${path}" ]
	then
		find "${path}" -type f | xargs cat > /dev/null 2>&1
	elif [ -f "${path}" ]
	then
		if [ -x /usr/bin/file ] && file -L "${path}" | grep -q 'dynamically linked'
		then
			# ldd output can be of three forms:
			# 1. linux-vdso.so.1 =>  (0x00007fffe3fb4000)
			#    This is a virtual, kernel shared library and we want to skip it
			# 2. libc.so.6 => /lib/libc.so.6 (0x00007f5e9dc0c000)
			#    We want to cache the third word.
			# 3. /lib64/ld-linux-x86-64.so.2 (0x00007f5e9df8b000)
			#    We want to cache the first word.
			ldd "${path}" | while read line
			do
				if echo "$line" | grep -qs ' =>  '
				then
					continue
				elif echo "$line" | grep -qs ' => '
				then
					lib=$(echo "${line}" | awk '{ print $3 }')
				else
					lib=$(echo "${line}" | awk '{ print $1 }')
				fi
				cache_path "${lib}"
			done
		fi

		cat "${path}" >/dev/null 2>&1
	fi
}

echo "live-tools: caching reboot files..."

prompt=1

case "${NOPROMPT}" in
	yes)
		prompt=
		;;
esac

for path in $(which halt) $(which reboot) /etc/rc?.d /etc/default $(which stty) /bin/plymouth
do
	cache_path "${path}"
done

mount -o remount,ro /lib/live/mount/overlay > /dev/null 2>&1

# Remounting any persistence devices read-only
for _MOUNT in $(awk '/\/lib\/live\/mount\/persistence/ { print $2 }' /proc/mounts)
do
	mount -o remount,ro ${_MOUNT} > /dev/null 2>&1
done

# Flush filesystem buffers
sync