init.d script for automated-ebs-snapshots tool

automated-ebs-snapshots

#!/bin/sh
### BEGIN INIT INFO
# Provides:          automated-ebs-snapshots
# Required-Start:    $local_fs $network $named $time $syslog
# Required-Stop:     $local_fs $network $named $time $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Description:       automated-ebs-snapshots
### END INIT INFO

# Known issue: after restarting the system pid file remains with dead process id, `start` function checks for that and sanitize the pid file.

CONFIG=/home/ec2-user/auomated_ebs_config.conf
SCRIPT="/usr/local/bin/automated-ebs-snapshots --config $CONFIG --list && /usr/local/bin/automated-ebs-snapshots --config $CONFIG --daemon start"
RUNAS=ec2-user
NAME=automated-ebs-snapshots

PIDFILE=/tmp/automatic-ebs-snapshots.pid
LOGFILE=/var/log/$NAME.log

start() {
  if [ -f $PIDFILE -a -z "$(ps axf | grep $(cat ${PIDFILE}) | grep -v grep)" ]; then
    local CMD="rm -f $PIDFILE"
    su -c "$CMD" $RUNAS
    echo 'Sanitized empty PID file…' >&2
  fi
  echo 'Starting service…' >&2
  local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
  su -c "$CMD" $RUNAS
  echo 'Service started' >&2
}

stop() {
  echo 'Stopping service…' >&2
  su -c "/usr/local/bin/automated-ebs-snapshots --config $CONFIG --daemon stop" $RUNAS
  echo 'Service stopped' >&2
}

uninstall() {
  echo -n "Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] "
  local SURE
  read SURE
  if [ "$SURE" = "yes" ]; then
    stop
    echo "Notice: log file was not removed: '$LOGFILE'" >&2
    update-rc.d -f <NAME> remove
    rm -fv "$0"
  fi
}

status() {
        printf "%-50s" "Checking $NAME..."
    if [ -f $PIDFILE ]; then
        PID=$(cat $PIDFILE)
            if [ -z "$(ps axf | grep ${PID} | grep -v grep)" ]; then
                printf "%s\n" "The process appears to be dead but pidfile still exists"
            else
                echo "Running, the PID is $PID"
            fi
    else
        printf "%s\n" "Service not running"
    fi
}


case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    status
    ;;
  uninstall)
    uninstall
    ;;
  restart)
    stop
    start
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart|uninstall}"
esac