#!/bin/bash

## SYNOPSIS ##
#
# Based on http://wiki.natenom.name/mumble/tools/mumble-db-tmpfs
#
# This scripts copies your mumble database and log from a backup directory into a tmpfs and dumps them with unmount
# switching between two ini files so mumble could run from ram and from sd as well.
# I decided to put the log file too in the ram disk because the life span of a SD card is severely related to the write cycles.
# You can run this script on boot/shutdown (google a bit to know how)
#
# Run this script as a SuperUser
#
# A big thank to Natenom!


## PREPARATION ##
#
# Make a directory where tmpfs will be mounted (i.e. /var/tmp/ or /home/pi/tmpfs/)
#
# In /etc/ make two copies of your mumble-server.ini named mumble-server.ram and mumble-server.sd
# in the first one you have to replace the path in "database=" and "logfile=" with your tmpfs directory
# in the second one set your backup directory path
#
# Now copy your database and log files in the backup directory (you can find their location in the original .ini file)
#
# It's good if you make a backup of mumble-server.ini and mumble-server.sqlite



_tmpfs_dir="[tmpfs location]"                   # Must be the same as database="[path of file] and logfile=[path of file] in mumble-server.ram
_database_backup_dir="[backup location]"        # The same path as in mumble-server.sd
_mumble_ini_dir="/etc"                          # *.ini file location. /etc by default
_owner="mumble-server"                          # Name of the user the mumble-server runs as (to set file permissions), you can get it from mumble-server.ini

case $1 in
  start)
      if [ "$(mount | grep ${_tmpfs_dir})" != "" ]; then        # Checking if _tmpfs_dir is already mounted... you have to use an empty ramdisk, this script may unmount
          echo "tmpfs partition already exists. Script halted." # the partition causing data loss if other process uses the same tmpfs!
      else

          echo "${_tmpfs_dir} is not mounted. Mounting..."
          mount tmpfs -t tmpfs "${_tmpfs_dir}"                  # Mounting tmpfs in _tmpfs_dir

          #if you use debian < 6.x, remove -n
          cp ${_mumble_ini_dir}/mumble-server.ram ${_mumble_ini_dir}/mumble-server.ini  # Using mumble-server.ram as *.ini file
          cp -n ${_database_backup_dir}/mumble-server.sqlite ${_tmpfs_dir}/             # Putting database and logfile in the tmpfs
          cp -n ${_database_backup_dir}/mumble-server.log ${_tmpfs_dir}/

          chown ${_owner} ${_tmpfs_dir}/mumble-server.sqlite                            # Fixing permissions
          chgrp ${_owner} ${_tmpfs_dir}/mumble-server.sqlite
          chown ${_owner} ${_tmpfs_dir}/mumble-server.log
          chgrp ${_owner} ${_tmpfs_dir}/mumble-server.log
          /etc/init.d/mumble-server restart                                             # Mumble server restart
          echo "Mumble server is up, database running from ram."
      fi
      ;;
  stop)
      if [ "$(mount | grep ${_tmpfs_dir})" != "" ]; then
          cp ${_tmpfs_dir}/mumble-server.sqlite ${_database_backup_dir}/                # Dumping database and logfile to disk
          cp ${_tmpfs_dir}/mumble-server.log ${_database_backup_dir}/

          chown ${_owner} ${_database_backup_dir}/mumble-server.sqlite                  # Fixing permissions
          chgrp ${_owner} ${_database_backup_dir}/mumble-server.sqlite
          chown ${_owner} ${_database_backup_dir}/mumble-server.log
          chgrp ${_owner} ${_database_backup_dir}/mumble-server.log

          /etc/init.d/mumble-server stop                                                # Shutting down mumble server
          cp ${_mumble_ini_dir}/mumble-server.sd ${_mumble_ini_dir}/mumble-server.ini   # Using mumble-server.sd as *.ini file
                                                                                        # so if you run mumble now it'll works (slowly)
          umount "${_tmpfs_dir}"                                                        # Unmounting tmpfs
          echo "Mumble server halted and tmpfs unmounted."
          echo "You can now reboot your system safely or restart mumble-server from sd"
      else
          echo "${_tmpfs_dir} is not mounted."
      fi
      ;;
  *)
      echo "$0 start|stop"
      ;;
esac