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#!/bin/bash
#
# Scripts to run by MySQL systemd service
#
# Needed argument: pre | post
#
# pre mode  :  try to perform sanity check for configuration, log, data
# post mode :  ping server until answer is received

sanity () {
  if [ ! -r /etc/mysql/my.cnf ]; then
    echo "MySQL configuration not found at /etc/mysql/my.cnf. Please create one."
    exit 1
  fi

  if [ ! -d /var/lib/mysql ] && [ ! -L /var/lib/mysql ]; then
    echo "MySQL data dir not found at /var/lib/mysql. Please create one."
    exit 1
  fi

  if [ ! -d /var/lib/mysql/mysql ] && [ ! -L /var/lib/mysql/mysql ]; then
    echo "MySQL system database not found. Please run mysql_install_db tool."
    exit 1
  fi
}

pinger () {
  server_up=false
  for i in $(seq 1 30); do
    sleep 1
    if mysqladmin ping >/dev/null 2>&1; then
      server_up=true
      break
    fi
  done
  if [ ! $server_up ]; then
    echo "MySQL server not started"
    exit 1
  fi
}

case $1 in
  "pre")  sanity ;;
  "post") pinger ;;
esac