#!/bin/bash

LOCKFILE="/var/mail-state/lib-postfix/master.lock"

function log() {
  echo "[health] $@"
}

if [ -f "$LOCKFILE" ]; then
  PID=$(cat "$LOCKFILE")
  log "pid $PID"
  if kill -0 "$PID" 2>/dev/null; then
    if ss --listening --tcp | grep -P 'LISTEN.+:smtp' > /dev/null; then
      log "successfully listening to smtp"
      exit 0
    fi
  else
    # Not our postfix lock.
    exit 0
  fi
fi

log "bad health state"
exit 1