| 1 | #!/bin/sh
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| 2 | #
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| 3 | # Shutdown system if it has been idle for 1 hour and no active users are logged
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| 4 | # in.
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| 5 | #
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| 6 | # Usage: This script is mainly used on a home server used for building FreeBSD
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| 7 | # World and kernels. As soon it is done it can shutdown if not being used
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| 8 | # anymore. The system has Wake-On-Lan support and can thus be activated again
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| 9 | # from remote.
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| 10 | #
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| 11 | # Please run from cron every CRON_INTERVAL minutes:
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| 12 | # */5 * * * * * /usr/local/bin/power-saver
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| 13 | #
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| 14 | # Rick van der Zwet <info@rickvanderzwet.nl>
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| 15 | #
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| 16 |
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| 17 | CRON_INTERVAL=5
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| 18 | MAX_LOAD=0.10
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| 19 | MAX_IDLE=60
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| 20 |
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| 21 | # Stored as <epoch> <load>
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| 22 | DAT_FILE='/tmp/power-saver.dat'
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| 23 |
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| 24 | # Current values
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| 25 | EPOCH=`date "+%s"`
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| 26 | LOAD_15=`sysctl vm.loadavg | awk '{print $5}'`
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| 27 |
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| 28 | # Empty file needs to be created and filled
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| 29 | echo "$EPOCH $LOAD_15" >> $DAT_FILE || exit 1
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| 30 |
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| 31 | # Check if countdown has already been started
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| 32 | ps -x | grep -q '[0-9] shutdown' && exit 0
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| 33 |
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| 34 | # Check if all users are no longer active
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| 35 | SHORTEST_IDLE=`w -ih | awk '{print $5}' | head -1`
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| 36 | # Hack to make sure time is always in minutes
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| 37 | SHORTEST_IDLE_IN_MIN=`echo $SHORTEST_IDLE | awk -F: '{if (NF > 1){print $1 * 60 + $2}else{print $1}}'`
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| 38 | if [ -z "$SHORTEST_IDLE_IN_MIN" ]; then
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| 39 | # No users are currently logged in
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| 40 | continue
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| 41 | elif [ "$SHORTEST_IDLE_IN_MIN" = "-" ]; then
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| 42 | # User is still active an minute ago
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| 43 | exit 0
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| 44 | elif [ $SHORTEST_IDLE_IN_MIN -le $MAX_IDLE ]; then
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| 45 | # User is still active less than MAX_IDLE ago
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| 46 | exit 0
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| 47 | fi
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| 48 |
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| 49 | # Count the amount entries we are current on our way
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| 50 | IDLE_COUNTS=`awk -vMAX_LOAD=$MAX_LOAD -vMAX_IDLE=$MAX_IDLE -vEPOCH=$EPOCH \
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| 51 | 'BEGIN{MIN_TIME=EPOCH-MAX_IDLE;s=0}{if ($1 > MIN_TIME && $2 > MAX_LOAD){s += 1}}END{print s}' $DAT_FILE`
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| 52 |
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| 53 | # We are idle for over $MAX_IDLE time, starting shutdown
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| 54 | if [ $IDLE_COUNTS -gt `expr $MAX_IDLE / $CRON_INTERVAL` ]; then
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| 55 | echo shutdown -p "+15" "Cancel: sudo killall -SIGTERM shutdown"
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| 56 | fi
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