launchd service doesn't receive SIGTERM in AWS instance termination

Hello, here is what I'm doing:

I creating AWS macOS instance

I then set up a /Library/LaunchDaemon plist file that runs a bash script:

Code Block 
  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "XXXXX/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <dict>
    <key>Label</key>
    <string>aws-ec2-mac-amis.cloud-connect</string>
    <key>ProgramArguments</key>
    <array>
      <string>/usr/bin/env</string>
      <string>/Users/ec2-user/aws-ec2-mac-amis/cloud-connect.bash</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>WorkingDirectory</key>
    <string>/Users/ec2-user</string>
    <key>StandardErrorPath</key>
    <string>/var/log/cloud-connect.log</string>
    <key>StandardOutPath</key>
    <string>/var/log/cloud-connect.log</string>
    <key>EnableTransactions</key>
    <true/>
    <key>ExitTimeOut</key>
    <string>300</string>
  </dict>
  </plist>

I've tried this same list without EnableTransactions and there is no difference.

This works and my bash script runs just fine:

Code Block 
#!/bin/bash
set -exo pipefail
[[ ! $EUID -eq 0 ]] && echo "RUN AS ROOT!" && exit 1
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
cd $SCRIPT_DIR
echo "Waiting for networking..."
while ! ping -c 1 -n github.com &> /dev/null; do sleep 1; done
git pull
. ./_helpers.bash
disjoin() {
  set -x
  /usr/local/bin/ankacluster disjoin &
  CERTS=""
  [[ ! -z "$CLOUD_CONNECT_CERT" ]] && CERTS="--cert $CLOUD_CONNECT_CERT"
  [[ ! -z "$CLOUD_CONNECT_KEY" ]] && CERTS="$CERTS --cert-key $CLOUD_CONNECT_KEY"
  [[ ! -z "$CLOUD_CONNECT_CA" ]] && CERTS="$CERTS --cacert $CLOUD_CONNECT_CA"
  NODE_ID="$(curl -s $CERTS "${ANKA_CONTROLLER_ADDRESS}/api/v1/node" | jq -r ".body | .[] | select(.node_name==\"$(hostname)\") | .node_id")"
  curl -s $CERTS -X DELETE "${ANKA_CONTROLLER_ADDRESS}/api/v1/node" -H "Content-Type: application/json" -d "{\"node_id\": \"$NODE_ID\"}"
}
# Grab the ENVS the user sets in user-data
if [[ ! -e $CLOUD_CONNECT_PLIST_PATH ]]; then
  mkdir -p $LAUNCH_LOCATION
cat > $CLOUD_CONNECT_PLIST_PATH <<EOD
  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
  <plist version="1.0">
  <dict>
    <key>Label</key>
    <string>aws-ec2-mac-amis.cloud-connect</string>
    <key>ProgramArguments</key>
    <array>
      <string>/usr/bin/env</string>
      <string>/Users/ec2-user/aws-ec2-mac-amis/cloud-connect.bash</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>WorkingDirectory</key>
    <string>/Users/ec2-user</string>
    <key>StandardErrorPath</key>
    <string>/var/log/cloud-connect.log</string>
    <key>StandardOutPath</key>
    <string>/var/log/cloud-connect.log</string>
    <key>EnableTransactions</key>
    <true/>
    <key>ExitTimeOut</key>
    <string>300</string>
  </dict>
  </plist>
EOD
  launchctl load -w $CLOUD_CONNECT_PLIST_PATH
else
  echo "$(date) ($(whoami)): Attempting join..."
  # Check if user-data exists
  [[ ! -z "$(curl -s XXXX/latest/user-data | grep 404)" ]] && echo "Could not find required ANKA_CONTROLLER_ADDRESS in instance user-data!" && exit 1
  # create user ENVs for this session
  $(curl -s XXXX/latest/user-data | sed 's/\"//g') 
  # IF the user wants to change the IP address for the registry domain name (if they want to use a second EC2 registry for better speed), handle setting the /etc/hosts
  if [[ ! -z "$ANKA_REGISTRY_OVERRIDE_IP" && ! -z "$ANKA_REGISTRY_OVERRIDE_DOMAIN" ]]; then
      modify_hosts $ANKA_REGISTRY_OVERRIDE_DOMAIN $ANKA_REGISTRY_OVERRIDE_IP
  fi
  # Ensure that anytime the script stops, we disjoin first
  /usr/local/bin/ankacluster join $ANKA_CONTROLLER_ADDRESS $ANKA_JOIN_ARGS
  trap disjoin 0 # Disjoin after we joined properly to avoid unloading prematurely
  set +x
  while true; do
    sleep 1 &
    wait $!
  done
fi

I see the process running, and the host has connected to the remote server's controller:

Code Block 
root            46851   0.0  0.0  4283172   1120   ??  Ss    8:49PM   0:00.09 /bin/bash /Users/ec2-user/aws-ec2-mac-amis/cloud
-connect.bash

However, when I terminate the AWS instance, the process stays running and the bash script's trap is never attempted (at least according to the logs).

This could very well be an AWS specific issue, however, I wanted to check here and see if I was potentially missing something important.

Some things that do work:

1. I can sudo shutdown -r now inside of the host and it disjoins properly before the host shuts down.

2. I can sudo launchctl -w unload inside of the host and it disjoins properly, too.