sap

#!/bin/sh
### BEGIN INIT INFO
# Provides: sap
# Required-Start: sapinit
# Default-Start: 2 3 5
# Default-Stop: 0 1 6
# Description: Starts SAP on this system, when restarting or after shutdown
### END INIT INFO

# Script variables
# TODO: Add check if user exists
SAPADMIN="<your user here>"

# Functions
# Starts SAP and initializes logging
startsap() {
  # If /var/lock/sap.lock exists, then SAP has been already started or is starting
  # Throw message and exit with return code 0
  # TODO: Add check if SAP is listening on certain ports
  if [ -f /var/lock/sap.lock ]; then
    echo "Sap is already starting or has been started, please take a look at /var/log/SAPStart log!"
    exit 0
  fi

  # Initialize log with actual date/time
  date > /var/log/SAPStart

  # Launch command under SAP admin user and return, because when booting up
  # we don't want to wait for SAP to start
  su $SAPADMIN -c "startsap >> /var/log/SAPStart" &

  # Create the file lock
  # TODO: Check return code of previous command
  touch /var/lock/sap.lock
}

stopsap() {
  # If /var/lock/sap.lock doesn't exist, then SAP has been already stopped
  # Throw message and exit with return code 0
  # TODO: Add check if SAP is listening on certain ports or not
  if [ ! -f /var/lock/sap.lock ]; then
    echo "Sap is already stopped, please take a look at /var/log/SAPStop log!"
    exit 0
  fi

  # Initialize log
  date > /var/log/SAPStop

  # Execute command under SAP admin user and log, we have no problem in waiting for command to finish
  su $SAPADMIN -c "stopsap >> /var/log/SAPStop"

  # Remove the file lock
  # TODO: Check return code of previous command
  rm -f /var/lock/sap.lock
}

# Main service
case "$1" in
  'restart')
    # Check if file exists or not, when exists, do only sapstart function, otherwise do both
    if [ ! -f /var/lock/sap.lock ]; then
      echo "SAP is not running, starting now!"
      startsap
    else
      echo "Stopping SAP..."
      stopsap

      echo "Starting SAP..."
      startsap
    fi
    ;;

  'start')
    echo "Starting SAP..."
    startsap
    ;;

  'status')
    # TODO: Port check
    if [ -f /var/lock/sap.lock ]; then
      echo "SAP is running!"
    else
      echo "SAP is NOT running!"
    fi
    ;;

  'stop')
    echo "Stopping SAP..."
    stopsap
    ;;
esac