zeraien/power-safety.sh

## power-safety.sh
#!/bin/bash
# If you are too cheap (like me) to buy an expensive "smart" UPS,
# this script will allow you to use a Raspberry Pi or any SSH-enabled device
# to automatically shut down your DiskStation when the Pi loses power.
# Meaning you simply plug the "heartbeat device" into regular power,
# and your DiskStation into a UPS, and when the regular power is dead,
# the heartbeat device will die thus your synology will be unable to reach it
# and shut down in due time (10min default).

# This script will check if a given ssh command responds
# with the correct phrase.
# If correct phrase is given, a timestamp is put into a text file.
# The timestamp is the time at which the machine should shutdown.
# A simple shell script called "powertest.sh" is placed on an
# SSH server, in this case a raspberry pi that is plugged into the
# regular grid power. If grid power goes down, the raspberry pi
# will die, so this script will not receive a reply, in which case
# the shutdown will occur 10 minutes since the last successful
# connection.

# HOSTNAME or IP of your heartbeat machine
HEARTBEAT_IP="powertest"

# the phrase that the heartbeat machine should respond with
TEST_PHRASE="power is on"

# the shutdown command
SHUTDOWN_CMD="synoshutdown --shutdown"

# the file where the scheduled shutdown time is stored
# this file just stores epoch seconds, when time is reached
# the shutdown will commence.
TIME_FILE=~/power_down_at

# how long can heartbeat not respond?
GRACE_SECONDS=600

# Synology DiskStation NAS LED and Beeps
# You can make your diskstation beep or change the LED state from the command line.
# Must be run as root.
# Example to make a long beep: `# echo 3 > /dev/ttyS1`
#
# Echo one of these for the desired effect:
# 2 - short beep
# 3 - longer beep
# 4 - blue power LED on
# 5 - blue power LED blink
# 6 - blue power LED off
# 7 - status LED off
# 8 - status LED on
# 9 - status LED blink
function signal() {
    echo $1 > /dev/ttyS1
}

NEXT_AT=$((`date +'%s'`+$GRACE_SECONDS))
if [[ -e $TIME_FILE ]]; then
    RESULT="`ssh $HEARTBEAT_IP . ./powertest.sh`"
    NOW=(`date +'%s'`)
    POWER_DOWN_AT=(`cat $TIME_FILE`)
    REMAINING=$(($POWER_DOWN_AT - $NOW))
    echo "Seconds until shutdown: $REMAINING"

    if [[ $REMAINING -lt 30 ]]; then
        # extra final heartbeat warning
        signal 3
        sleep 1
    fi

    if [[ $REMAINING -lt -300 ]] || [[ $RESULT == $TEST_PHRASE ]]; then
        # normal state - set shutdown time to 10 minutes from now
        signal 4
        signal 8
        echo $NEXT_AT > $TIME_FILE
    elif [[ $REMAINING -lt 0 ]]; then
        # the end, shutdown!
        echo "Will power down now, running $SHUTDOWN_CMD."
        echo `$SHUTDOWN_CMD`
    else
        # warn user that we do not detect a heartbeat
        signal 2
        signal 2
        signal 9
        echo "No connection to dead man's switch - $REMAINING seconds until shutdown."
    fi
else
    echo $NEXT_AT > $TIME_FILE
fi
	#!/bin/bash
	# If you are too cheap (like me) to buy an expensive "smart" UPS,
	# this script will allow you to use a Raspberry Pi or any SSH-enabled device
	# to automatically shut down your DiskStation when the Pi loses power.
	# Meaning you simply plug the "heartbeat device" into regular power,
	# and your DiskStation into a UPS, and when the regular power is dead,
	# the heartbeat device will die thus your synology will be unable to reach it
	# and shut down in due time (10min default).

	# This script will check if a given ssh command responds
	# with the correct phrase.
	# If correct phrase is given, a timestamp is put into a text file.
	# The timestamp is the time at which the machine should shutdown.
	# A simple shell script called "powertest.sh" is placed on an
	# SSH server, in this case a raspberry pi that is plugged into the
	# regular grid power. If grid power goes down, the raspberry pi
	# will die, so this script will not receive a reply, in which case
	# the shutdown will occur 10 minutes since the last successful
	# connection.

	# HOSTNAME or IP of your heartbeat machine
	HEARTBEAT_IP="powertest"

	# the phrase that the heartbeat machine should respond with
	TEST_PHRASE="power is on"

	# the shutdown command
	SHUTDOWN_CMD="synoshutdown --shutdown"

	# the file where the scheduled shutdown time is stored
	# this file just stores epoch seconds, when time is reached
	# the shutdown will commence.
	TIME_FILE=~/power_down_at

	# how long can heartbeat not respond?
	GRACE_SECONDS=600

	# Synology DiskStation NAS LED and Beeps
	# You can make your diskstation beep or change the LED state from the command line.
	# Must be run as root.
	# Example to make a long beep: `# echo 3 > /dev/ttyS1`
	#
	# Echo one of these for the desired effect:
	# 2 - short beep
	# 3 - longer beep
	# 4 - blue power LED on
	# 5 - blue power LED blink
	# 6 - blue power LED off
	# 7 - status LED off
	# 8 - status LED on
	# 9 - status LED blink
	function signal() {
	echo $1 > /dev/ttyS1
	}

	NEXT_AT=$((`date +'%s'`+$GRACE_SECONDS))
	if [[ -e $TIME_FILE ]]; then
	RESULT="`ssh $HEARTBEAT_IP . ./powertest.sh`"
	NOW=(`date +'%s'`)
	POWER_DOWN_AT=(`cat $TIME_FILE`)
	REMAINING=$(($POWER_DOWN_AT - $NOW))
	echo "Seconds until shutdown: $REMAINING"

	if [[ $REMAINING -lt 30 ]]; then
	# extra final heartbeat warning
	signal 3
	sleep 1
	fi

	if [[ $REMAINING -lt -300 ]] \|\| [[ $RESULT == $TEST_PHRASE ]]; then
	# normal state - set shutdown time to 10 minutes from now
	signal 4
	signal 8
	echo $NEXT_AT > $TIME_FILE
	elif [[ $REMAINING -lt 0 ]]; then
	# the end, shutdown!
	echo "Will power down now, running $SHUTDOWN_CMD."
	echo `$SHUTDOWN_CMD`
	else
	# warn user that we do not detect a heartbeat
	signal 2
	signal 2
	signal 9
	echo "No connection to dead man's switch - $REMAINING seconds until shutdown."
	fi
	else
	echo $NEXT_AT > $TIME_FILE
	fi
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