periodicShutdown.sh

#!/bin/bash

########################################################################################
# This script is designed to be called with no arguments as a periodic cron job. It    #
# will check for instances that have been spun up, and shut them down after a set time #
# period elapses (currently set to 2 weeks). They will be able to be started back up   #
# manually if desired. To determine an instance's age, the directory timestamp of the  #
# instance root folder is used. When an instance is started up afterwards (or          #
# recreated for some reason), the timestamp should be updated and then automatically   #
# not be shut down again by this script.                                               #
########################################################################################

###############
# Basic Setup #
###############

# Echo out what we're doing
echo "Checking for any instances to shut down (current time: $(date))."

# Enter the folder of instances
cd ~/CICD_TestInstances || { echo "Test Instances Folder Missing, Aborting."; exit 1; }

# Save current time
NOW=$(date +"%s")

# Calculate time offset. seconds * minutes * days * 2 weeks
(( TIMEOUT = 60*60*24*14 ))

# Loop through each folder and check if it's time to shut it down
for entry in "."/*
do
  entry=${entry:2}
  echo "$entry"

  # See if it's running
  if docker ps --format '{{.Names}}' | grep -q "$entry"; then
    echo "Instance is running."

    # Check the modified time
    INSTANCETIME=$(stat -c %Y "$entry")  # Checks the modified time of the instance folder

    # Compare
    (( DAYSOLD = ( ( NOW - INSTANCETIME ) / ( 60*60*24 ) ) ))
    echo "Instance is $DAYSOLD days old ($(stat -c %y "$entry"))."

    # Check if too old
    if (( ( NOW - INSTANCETIME ) > TIMEOUT )); then
        echo "Shutting down instance."

        # Enter the folder to shut it down
        cd "$entry/PollBuddy" || { echo "Failed to cd into instance, aborting."; exit 1; }
        docker-compose -p "$entry" down
        cd ../../ || { echo "Failed to cd out of instance, aborting."; exit 1; }
        echo "Instance has been shut down."

    else
        echo "Instance does not need to be shut down."
    fi

  else
    echo "Instance not running, ignoring."
  fi

  echo "---"

done

echo "Instance check complete on $(date)."
echo ""

# Exit
exit 0