cookbooks/aws-parallelcluster-environment/templates/cfn_hup_configuration/ComputeFleet/cfn-hup-update-action.sh.erb

#!/bin/bash
set -ex

# This script is invoked by cfn-hup as part of its update hook action.
# This script runs on each node of ComputeFleet to monitor the shared location for latest dna.json and extra.json files and run ParallelCluster Cookbook recipes.
#
# Usage:   ./cfn-hup-update-action.sh

function run_cookbook_recipes() {
    LATEST_DNA_LOC=<%= @monitor_shared_dir %>
    LATEST_DNA_FILE=$LATEST_DNA_LOC/<%= @launch_template_resource_id %>-dna.json
    LATEST_EXTRA_FILE=$LATEST_DNA_LOC/extra.json

    GET_DNA_FILE=true
    while $GET_DNA_FILE; do
        if [[ -f $LATEST_DNA_FILE ]]; then
          GET_DNA_FILE=false
          cp $LATEST_DNA_FILE /tmp/dna.json
          chown root:root /tmp/dna.json
          chmod 000644 /tmp/dna.json
          cp $LATEST_EXTRA_FILE /tmp/extra.json
          chown root:root /tmp/extra.json
          chmod 000644 /tmp/extra.json
          mkdir -p /etc/chef/ohai/hints
          touch /etc/chef/ohai/hints/ec2.json
          jq -s ".[0] * .[1]" /tmp/dna.json /tmp/extra.json > /etc/chef/dna.json || ( echo "jq not installed"; cp /tmp/dna.json /etc/chef/dna.json )
          cd /etc/chef
          cinc-client --local-mode --config /etc/chef/client.rb --log_level info --logfile /var/log/chef-client.log --force-formatter --no-color --chef-zero-port 8889 --json-attributes /etc/chef/dna.json --override-runlist aws-parallelcluster-entrypoints::update && /opt/parallelcluster/scripts/fetch_and_run -postupdate

        fi

        sleep 60
    done
}


main() {
  PATH=/usr/local/bin:/bin:/usr/bin:/opt/aws/bin;
  . /etc/parallelcluster/pcluster_cookbook_environment.sh;
  echo "We monitor <%= @monitor_shared_dir %> to check for <%= @launch_template_resource_id %>-dna.json has been added and run ParallelCluster cookbook recipes."
  run_cookbook_recipes
}


main "$@"