#!/usr/bin/env bash

# check script curently running and exit or continue
me="$(basename "$0")";
result=$(ps aux | grep -i "$me" | grep -v "grep" | wc -l)
echo "running: $result"
if [ "$result" -gt 3 ]
   then
        exit
fi

# declarations
DIR_VOLUMES=/mnt/NASbarracuda1TB/keese/seafile-arm/volumes # path to seafile docker volumes dir
DIR_BACKUP=/mnt/NASbarracuda1TB/backup/keese/seafile # where to store the backup

# mysql credentials to access databases inside seafile-mysql docker
MYSQL_USER=root
MYSQL_PASSWORD=mysqlrootpasswd

# specify seafile-mysql docker name and temporary backup location inside the docker
DOCKER_SEAFILE_MYSQL=seafile-mysql


#------------------------------------------------------------
# warning: only change below if you know what you are doing!


# build dependend dir paths
DIR_BACKUP_DB=${DIR_BACKUP}/db
TIMESTAMP=$(date +"%Y-%m-%d-%H-%M-%S")
DOCKER_BACKUP_DIR=/home/backup
DOCKER_BACKUP_DIR_TIMESTAMP="${DOCKER_BACKUP_DIR}/${TIMESTAMP}"
DIR_BACKUP_LOGS=${DIR_BACKUP}/logs
LOGFILE_STATUS="${TIMESTAMP}_rsync_status.log"
LOGFILE_PATH="${DIR_BACKUP_LOGS}/${LOGFILE_STATUS}"


# 1) backup seafile databases
docker exec -ti ${DOCKER_SEAFILE_MYSQL} sh -c "mkdir -p ${DOCKER_BACKUP_DIR_TIMESTAMP}" # create remporary backup dir inside docker
IFS=$'\n\r' # set the IFS to a newline character, so that a whole line can be assigned to an array element
DATABASES=( $(docker exec -ti ${DOCKER_SEAFILE_MYSQL} sh -c "mysql -e 'show databases' -s --skip-column-names -u ${MYSQL_USER} -p${MYSQL_PASSWORD}") ) # parse database names into array

# loop databases and dump tables to sql files inside temporary docker backup folder
for i in "${DATABASES[@]:1}"
do
   : 
   docker exec -ti  ${DOCKER_SEAFILE_MYSQL} sh -c "mysqldump --single-transaction -h localhost -u ${MYSQL_USER} -p${MYSQL_PASSWORD} --opt ${i} > ${DOCKER_BACKUP_DIR_TIMESTAMP}/${i}.sql"
done

# 2) copy backup database files to host and cleanup
docker cp ${DOCKER_SEAFILE_MYSQL}:${DOCKER_BACKUP_DIR_TIMESTAMP} ${DIR_BACKUP_DB}
docker exec -ti ${DOCKER_SEAFILE_MYSQL} sh -c "rm -r ${DOCKER_BACKUP_DIR}"

# 3) backup seafile docker volumes folder
rsync -azh --log-file "${LOGFILE_PATH}" ${DIR_VOLUMES} ${DIR_BACKUP}