UDM Pro 2.x redeployer for existing Elastic Agent after fw/sw upgrade removes some files

elastic-agent

#!/bin/sh
exec /opt/Elastic/Agent/elastic-agent $@

elastic-agent.service

[Unit]
Description=Elastic Agent is a unified agent to observe, monitor and protect your system.
ConditionFileIsExecutable=/usr/bin/elastic-agent

[Service]
StartLimitInterval=5
StartLimitBurst=10
ExecStart=/usr/bin/elastic-agent

WorkingDirectory=/opt/Elastic/Agent

Restart=always

RestartSec=120
EnvironmentFile=-/etc/sysconfig/elastic-agent

[Install]
WantedBy=multi-user.target

redeployer.sh

#!/bin/bash

# Save original execution path
EXECPATH=$(pwd)

# Extract the path for the script
SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"

# Navigate to the script, regardless of whether we were there
cd $SCRIPTPATH

BINFILE=elastic-agent
BINPATH=/usr/bin
SVCFILE=elastic-agent.service
SVCPATH=/etc/systemd/system
LNKFILE=/opt/Elastic
LNKPATH=/volume1/Elastic

if [ ! -f "$BINPATH/$BINFILE" ]; then
  echo "$BINPATH/$BINFILE not found!"
  echo "Copying $BINFILE to $BINPATH..."
  cp $BINFILE $BINPATH/
else
  echo "$BINPATH/$BINFILE already present."
fi

if [ ! -f "$SVCPATH/$SVCFILE" ]; then
  echo "$SVCPATH/$SVCFILE not found!"
  echo "Copying $SVCFILE to $SVCPATH..."
  cp $SVCFILE $SVCPATH/
else
  echo "$SVCPATH/$SVCFILE already present."
fi

if [ ! -L "$LNKFILE" ]; then
  echo "Symlink $LNKFILE not found!"
  echo "Symlinking $LNKFILE to point to $LNKPATH..."
  ln -s $LNKPATH $LNKFILE
else
  echo "Symlink $LNKFILE already present."
fi

STATUS=$(OUTPUT=`/bin/systemctl status $SVCFILE`; echo $OUTPUT | awk -F\Active\:\  '{print $2}' | awk '{print $1,$2}')


if [ "$STATUS" != "active (running)" ]; then
  echo "Elastic Agent is not running. Restarting..."
  /bin/systemctl restart $SVCFILE
else
  echo "Elastic Agent is already properly running."
fi