#!/bin/bash

# rd_audio_sync
#
# Syncronize a Rivendell audio archive with the master server.
#
#   (C) Copyright 2004,2016 Fred Gleason <fredg@paravelsystems.com>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License version 2 as
#   published by the Free Software Foundation.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public
#   License along with this program; if not, write to the Free Software
#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# Usage:
#  rd_audio_sync <master-hostname>
#

#
# Configuration and Paths
#
MODULE_NAME=rivendell
CHECK_FILE=repl.chk
BACKUP_DIR=/var/snd.standby
NICE_ADJ=15
RSYNC=/usr/bin/rsync
NICE=/usr/bin/nice

#
# Check that rd_audio_sync is not already running
#
lockdir=/var/tmp/rd_audio_sync.lock
if mkdir "$lockdir" 2> /dev/null ; then
        #echo >&2 "successfully acquired lock"

        # Remove lockdir when the script finishes, or when it receives a signal
        trap 'rm -rf "$lockdir"' 0    # remove directory when script finishes
        trap "exit 2" 1 2 3 15        # terminate script when receiving signal
else
        echo >&2 "cannot acquire lock, giving up on $lockdir"
        exit 0
fi

#
# Check that the master is alive and well
#
$RSYNC $1::$MODULE_NAME/$CHECK_FILE > /dev/null 2> /dev/null
if [ $? -ne 0 ] ; then
   echo "rd_audio_sync: check file not found, aborting"
  exit 1
fi

#
# Replicate
#
$NICE -n $NICE_ADJ $RSYNC --times --dirs --delete $1::$MODULE_NAME/*.wav $BACKUP_DIR > /dev/null 2> /dev/null
if [ $? -ne 0 ] ; then
  echo "rd_audio_sync: replication returned an error, check rsyncd logs"
  exit 2
fi

#
# Cleanup partially transferred files left by buggy versions of rsync (i.e. 2.6.8)
#
$NICE -n $NICE_ADJ rm $BACKUP_DIR/.*wav.* 2> /dev/null

exit 0


# End of rd_audio_sync



