pg_backup_rotated.sh

#!/bin/bash
 
###########################
####### LOAD CONFIG #######
###########################
 
while [ $# -gt 0 ]; do
        case $1 in
                -c)
                        CONFIG_FILE_PATH="$2"
                        shift 2
                        ;;
                *)
                        ${ECHO} "Unknown Option \"$1\"" 1>&2
                        exit 2
                        ;;
        esac
done
 
if [ -z $CONFIG_FILE_PATH ] ; then
        SCRIPTPATH=$(cd ${0%/*} && pwd -P)
        CONFIG_FILE_PATH="${SCRIPTPATH}/pg_backup.config"
fi
 
if [ ! -r ${CONFIG_FILE_PATH} ] ; then
        echo "Could not load config file from ${CONFIG_FILE_PATH}" 1>&2
        exit 1
fi
 
source "${CONFIG_FILE_PATH}"
 
###########################
#### PRE-BACKUP CHECKS ####
###########################
 
# Make sure we're running as the required backup user
if [ "$BACKUP_USER" != "" -a "$(id -un)" != "$BACKUP_USER" ] ; then
	echo "This script must be run as $BACKUP_USER. Exiting." 1>&2
	exit 1
fi
 
 
###########################
### INITIALISE DEFAULTS ###
###########################
 
if [ ! $HOSTNAME ]; then
	HOSTNAME="localhost"
fi;
 
if [ ! $USERNAME ]; then
	USERNAME="postgres"
fi;
 
 
###########################
#### START THE BACKUPS ####
###########################
 
function perform_backups()
{
	SUFFIX=$1
	FINAL_BACKUP_DIR=$BACKUP_DIR"`date +\%Y\%m\%d`$SUFFIX-"
 
	#echo "Making backup directory in $FINAL_BACKUP_DIR"
 
	#if ! mkdir -p $FINAL_BACKUP_DIR; then
	#	echo "Cannot create backup directory in $FINAL_BACKUP_DIR. Go and fix it!" 1>&2
	#	exit 1;
	#fi;
 
 
	###########################
	### SCHEMA-ONLY BACKUPS ###
	###########################
 
	for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ }
	do
	        SCHEMA_ONLY_CLAUSE="$SCHEMA_ONLY_CLAUSE or datname ~ '$SCHEMA_ONLY_DB'"
	done
 
	SCHEMA_ONLY_QUERY="select datname from pg_database where false $SCHEMA_ONLY_CLAUSE order by datname;"
 
	echo -e "\n\nPerforming schema-only backups"
	echo -e "--------------------------------------------\n"
 
	SCHEMA_ONLY_DB_LIST=`psql -h "$HOSTNAME" -U "$USERNAME" -At -c "$SCHEMA_ONLY_QUERY" postgres`
 
	echo -e "The following databases were matched for schema-only backup:\n${SCHEMA_ONLY_DB_LIST}\n"
 
	for DATABASE in $SCHEMA_ONLY_DB_LIST
	do
	        echo "Schema-only backup of $DATABASE"
 		
	        if ! pg_dump -Fp -s -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip --stdout | s3cmd --reduced-redundancy put - $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress --no-encrypt; then
	                echo "[!!ERROR!!] Failed to backup database schema of $DATABASE" 1>&2
	        else
	                s3cmd mv $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE"_SCHEMA.sql.gz
	        fi
	done
 
 
	###########################
	###### FULL BACKUPS #######
	###########################
 
	for SCHEMA_ONLY_DB in ${SCHEMA_ONLY_LIST//,/ }
	do
		EXCLUDE_SCHEMA_ONLY_CLAUSE="$EXCLUDE_SCHEMA_ONLY_CLAUSE and datname !~ '$SCHEMA_ONLY_DB'"
	done
 
	FULL_BACKUP_QUERY="select datname from pg_database where not datistemplate and datallowconn $EXCLUDE_SCHEMA_ONLY_CLAUSE order by datname;"
 
	echo -e "\n\nPerforming full backups"
	echo -e "--------------------------------------------\n"
 
	for DATABASE in `psql -h "$HOSTNAME" -U "$USERNAME" -At -c "$FULL_BACKUP_QUERY" postgres`
	do
		if [ $ENABLE_PLAIN_BACKUPS = "yes" ]
		then
			echo "Plain backup of $DATABASE"
 			
			if ! pg_dump -Fp -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip --stdout | s3cmd --reduced-redundancy put - $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress --no-encrypt; then
	                	echo "[!!ERROR!!] Failed to produce plain backup database schema of $DATABASE" 1>&2
	        	else
	                	s3cmd mv $FINAL_BACKUP_DIR"$DATABASE".sql.gz.in_progress $FINAL_BACKUP_DIR"$DATABASE".sql.gz
	        	fi
		fi
 
		if [ $ENABLE_CUSTOM_BACKUPS = "yes" ]
		then
			echo "Custom backup of $DATABASE"
 			if ! pg_dump -Fc -h "$HOSTNAME" -U "$USERNAME" "$DATABASE" | gzip --stdout | s3cmd --reduced-redundancy put - $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress --no-encrypt; then
	                	echo "[!!ERROR!!] Failed to produce custom backup database schema of $DATABASE" 1>&2
	        	else
	                	s3cmd mv $FINAL_BACKUP_DIR"$DATABASE".custom.in_progress $FINAL_BACKUP_DIR"$DATABASE".custom
	        	fi
		fi
 
	done
 
	echo -e "\nAll database backups complete!"
}
 
# MONTHLY BACKUPS
 
DAY_OF_MONTH=`date +%d`
 
if [ $DAY_OF_MONTH -eq 1 ];
then
	# Delete all expired monthly directories
	find $BACKUP_DIR -maxdepth 1 -name "*-monthly" -exec rm -rf '{}' ';'
 
	perform_backups "-monthly"
 
	exit 0;
fi
 
# WEEKLY BACKUPS
 
DAY_OF_WEEK=`date +%u` #1-7 (Monday-Sunday)
EXPIRED_DAYS=`expr $((($WEEKS_TO_KEEP * 7) + 1))`
 
if [ $DAY_OF_WEEK = $DAY_OF_WEEK_TO_KEEP ];
then
	# Delete all expired weekly directories
	find $BACKUP_DIR -maxdepth 1 -mtime +$EXPIRED_DAYS -name "*-weekly" -exec rm -rf '{}' ';'
 
	perform_backups "-weekly"
 
	exit 0;
fi
 
# DAILY BACKUPS
 
# Delete daily backups $DAYS_TO_KEEP days old or more
#find $BACKUP_DIR -maxdepth 1 -mtime +$DAYS_TO_KEEP -name "*-daily" -exec rm -rf '{}' ';'

#set $deldate to date minus $DAYS_TO_KEEP
deldate=`date +"%Y%m%d" --date="$DAYS_TO_KEEP days ago"`

#remove leading bucket name from s3 object displayed by "s3cmd ls $bucketname"
#compare first 8 chars of s3 object name (minus bucket name) with $deldate, 
#if first 8 chars of s3 object name::int <= $deldate then delete those s3 objects
s3cmd ls $BACKUP_DIR | awk -v bucket="$BACKUP_DIR" -v deldate="$deldate" '{gsub(bucket,"",$4);if (substr($4,0,9)<=deldate) system("s3cmd info " bucket$4)}' 
#replace s3cmd info by s3cmd del

perform_backups "-daily"