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/bin/live-medium-eject is in live-tools 1:20151214+nmu1.

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

# 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 netboot
   grep -qs "netboot" /proc/cmdline || \
   grep -qs "root=/dev/nfs" /proc/cmdline || \
   grep -qs "root=/dev/cifs" /proc/cmdline || \
# Exit if system is findiso
   grep -qs "find_iso" /proc/cmdline || \
# Exit if system is toram
   grep -qs "toram" /proc/cmdline || \
# Exit if user disabled medium eject
   grep -qs "cdrom-detect/eject=false" /proc/cmdline || \
   grep -qs "noeject" /proc/cmdline
then
	exit 0
fi

# Reading configuration files from filesystem and live-medium
for _FILE in /etc/live/tools.conf /etc/live/tools/* \
	     /lib/live/mount/medium/live/tools.conf /lib/live/mount/medium/live/tools/*
do
	if [ -e "${_FILE}" ]
	then
		. "${_FILE}"
	fi
done

# Setting defaults
LIVE_MEDIUM_EJECT_VERBOSE="${LIVE_MEDIUM_EJECT_VERBOSE:-true}"

# Ejecting live-medium
_DEVICE="$(awk '/\/lib\/live\/mount\/medium / { print $1 }' /proc/mounts) | sed -e 's|/dev/||' -e 's|[0-9].*$||')"

if [ ! -b "/dev/${_DEVICE}" ]
then
	exit 0
fi

case "${_DEVICE}" in
	sd*)
		if readlink "/sys/block/${_DEVICE}" | grep -q usb
		then
			# ignoring usb mass storage devices
			# (they need coldreboot to recover)
			exit 0
		fi
		;;
esac

if [ -x "$(which eject 2> /dev/null)" ]
then
	eject -p -m /dev/${_DEVICE} > /dev/null 2>&1
fi

case "${LIVE_MEDIUM_EJECT_VERBOSE}" in
	true)
		if [ -x /bin/plymouth ] && plymouth --ping
		then
			plymouth message --text="Please remove the live-medium, close the tray (if any) and press ENTER to continue:"
			plymouth watch-keystroke > /dev/null
		else
			stty sane < /dev/console

			printf "\n\nPlease remove the live-medium, close the tray (if any) and press ENTER to continue:" > /dev/console

			read x < /dev/console
		fi
		;;
esac