#!/bin/bash

# set -e

# source job.conf
BACKUP_DIR=/backups
CONFIG_DIR=/config
SSH_CF_DIR=/root/.ssh

gen_config(){
 	[ ! -f "$SSH_CF_DIR/id_rsa" ] && ssh-keygen -t rsa -b 4096 -f "$SSH_CF_DIR/id_rsa" -q -C "rdiff-backup-dockerized @ ${SSH_KEY_MARKER}" && chmod go-rwx $SSH_CF_DIR/id_rsa
	
	if [ ! -f "$SSH_CF_DIR/config" ]; then
		echo 'Host *' > "$SSH_CF_DIR/config"
		echo '   StrictHostKeyChecking no' >> "$SSH_CF_DIR/config"
		# echo '   UserKnownHostsFile=/dev/null' >> "$SSH_CF_DIR/config"
		
		chmod go-rwx $SSH_CF_DIR/config
	fi
	
	[ ! -f "$CONFIG_DIR/example_conf.sh" ] && cp /example_conf.sh "$CONFIG_DIR/example_conf.sh"
}

backup(){
	#Konfiguration resetten
	source "/reset-conf.sh"
	
	echo " "
	echo Start backup $1 
	echo ==================================================
	
	# neue Konfiguration lesen
	source "$CONFIG_DIR/$1"
	
	# SCHRITT 1:
	# sichern der MySQL-Datenbanken auf dem remote host
	# es muss auf dem remote host genug Platz auf der Festplatte geben damit Dump erfolgen kann!
	
	if [  ${#MYSQL_DB[@]} -gt 0 ]
	then
		[ "$MYSQL_DUMP_DIR" != "" ] && [ "$MYSQL_DUMP_DIR" != "/" ] && ssh ${REMOTE_USER}@${REMOTE_HOST} "[ ! -d \"$MYSQL_DUMP_DIR\" ] && mkdir -p \"$MYSQL_DUMP_DIR\""
		
		for db in "${MYSQL_DB[@]}"
		do
			ssh ${REMOTE_USER}@${REMOTE_HOST} "mysqldump -u \"$MYSQL_USER\" \"-p$MYSQL_PASS\" --add-drop-database --routines --single-transaction \"$db\" > \"$MYSQL_DUMP_DIR/$db.sql\""
		done
	
		# Ordner mit SQL-Dateien in die Sicherung aufnehmen
		FOLDERS+=("$MYSQL_DUMP_DIR")
	fi

	# SCHRITT 2:
	# die Sicherung der Ordner (inklusive der SQL-Dump)
	for dir in "${FOLDERS[@]}"
	do
		# prüfen ob das backup-ordner existiert ...
		if [ ! -d "$BACKUP_DIR/${REMOTE_HOST}${dir}" ];
		then
			# ... und gegebenfals anlegen
			mkdir -p "$BACKUP_DIR/${REMOTE_HOST}${dir}"
		fi
		
		# die eigentliche Sicherung ...	
		rdiff-backup --exclude-special-files "${REMOTE_USER}@${REMOTE_HOST}::${dir}" "$BACKUP_DIR/${REMOTE_HOST}${dir}"
		
		# alle Sicherungen die älter als $DELETE_OLD_FILES löschen
		rdiff-backup --remove-older-than $DELETE_OLD_FILES --force "$BACKUP_DIR/${REMOTE_HOST}${dir}"
	done
	
	# SCHRITT 3: 
	# die SQL-Dateien vom remote host wieder löschen 
	if [  ${#MYSQL_DB[@]} -gt 0 ]
	then
		[ "$MYSQL_DUMP_DIR" != "" ] && [ "$MYSQL_DUMP_DIR" != "/" ] && ssh ${REMOTE_USER}@${REMOTE_HOST} "rm -rf \"$MYSQL_DUMP_DIR/\"*.sql"
	fi
	echo Done backup $1 
	echo " "
}


# ACHTUNG NOCH NICHT FERTIG !!
restore(){
	for dir in "${FOLDERS[@]}"
	do
		rdiff-backup -r now "$BACKUP_DIR/${REMOTE_HOST}${dir}" "${REMOTE_USER}@${REMOTE_HOST}::${dir}"
	done
}

if [ "$1" == "--gen-config" ]; then
	gen_config
elif [ "$1" == "--backup" ]; then
	backup "$2"
else
	echo "nichts zu tun?"
fi