#!/bin/bash

# Script to backup Hall-D wiki
# May 15, 2008  David Lawrence
# April 18, 2014 - Updated  David Lawrence
#
# This script can be used to make a backup of the Hall-D wiki.
# It can be run in 2 modes. The first will simiply create a 
# full backup (as a tarball) in the current working directory.
# If, however, the "-c" command-line switch is used, then the
# tarball will be created in the BACKUPS directory on the halld
# work disk and older backups removed such that only the 5
# most recent ones are kept.
#

export DATABASE_HOST=cnidb.jlab.org
export DATABASE_NAME=halldwikidb
export DATABASE_USER=halldwiki
export DATABASE_PASS=wiki

export BACKUPDIR=wiki_backup_`date +%y-%m-%d`
export WIKI_ROOT=/group/halld/www/halldweb1/html/wiki
export CRON_BACKUP_DIR=/work/halld/BACKUPS/wiki
export CRON_BACKUP=0

# Check command line arguments
while getopts ":c" Option
do
  case $Option in
    c     ) CRON_BACKUP=1;;
    *     ) echo "Unimplemented option chosen.";;   # DEFAULT
  esac
done
shift $(($OPTIND - 1))

if [ $CRON_BACKUP -eq "1" ]
then
	mkdir -p $CRON_BACKUP_DIR
	cd $CRON_BACKUP_DIR
fi

echo "Working in directory:"
pwd

# Create directory to hold everything we want to tarball
mkdir $BACKUPDIR

echo "Dumping MySQL database from $DATABASE_HOST ..."
mysqldump -h $DATABASE_HOST --database $DATABASE_NAME -u $DATABASE_USER -p$DATABASE_PASS --add-drop-table -B > $BACKUPDIR/halldwikidb.sql

echo "Copying extensions ..."
cp -rp --no-dereference $WIKI_ROOT/extensions $BACKUPDIR/extensions.JLab
cp -p --no-dereference $WIKI_ROOT/README.JLab $BACKUPDIR

echo "Copying images ..."
cp -rp --no-dereference $WIKI_ROOT/images $BACKUPDIR

echo "Copying LocalSettings.php ..."
cp -p $WIKI_ROOT/LocalSettings.php $BACKUPDIR

echo "Creating tarball ..."
tar czf ${BACKUPDIR}.tgz $BACKUPDIR

rm -rf $BACKUPDIR

# If the "-c" option was specified, then remove backup files
# until we have no more than 5. Note that this part is only
# slightly modified from a script copied from:
# http://www.mediawiki.org/wiki/User:Flominator/Backup_MW
if [ $CRON_BACKUP -eq "1" ]
then
	# Count files in directory
	file_count=`ls -1A wiki_backup*.tgz | wc -l` 
 
	# Do until there are less than 6 files present
	while [ $file_count -ge 6 ]
	do
		# Delete alphabetically oldest file
		rm `ls -1Ar wiki_backup*.tgz | tail -1` 
		# Count files again
		file_count=`ls -1A wiki_backup*.tgz | wc -l`
	done
fi