#!/bin/bash
#==============================================================================
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
# 0 2 * * * /bin/bash /tmp/backup.sh

#RSYNC -> sshpass -p 'ictmaatwerk' rsync /tmp/backups/. root@51.68.230.92:/tmp --delete -av --ignore-existing

#==============================================================================
# CUSTOM SETTINGS
#==============================================================================

# directory to put the backup files
BACKUP_DIR=/backup

# MYSQL Parameters
MYSQL_UNAME=root
MYSQL_PWORD=ictmaatwerk

# Don't backup databases with these names 
# Example: starts with mysql (^mysql) or ends with _schema (_schema$)
IGNORE_DB="(^mysql|_schema$)"

# include mysql and mysqldump binaries for cron bash user
PATH=$PATH:/usr/local/mysql/bin

# Number of days to keep backups
KEEP_BACKUPS_FOR=30 #days

#==============================================================================
# METHODS
#==============================================================================

# YYYY-MM-DD
TIMESTAMP=$(date +%F_%H:%M)

function delete_old_backups()
{
    # Delete mysql older x days
  echo "Deleting $BACKUP_DIR/*.sql.gz older than $KEEP_BACKUPS_FOR days"
  find $BACKUP_DIR -type f -name "*.sql.gz" -mtime +$KEEP_BACKUPS_FOR -exec rm {} \;
    # Delete html folder older x days
  echo "Deleting $BACKUP_DIR/*.tar.gz older than $KEEP_BACKUPS_FOR days"
  find $BACKUP_DIR -type f -name "*.tar.gz" -mtime +$KEEP_BACKUPS_FOR -exec rm {} \;
}

function mysql_login() {
  local mysql_login="-u $MYSQL_UNAME" 
  if [ -n "$MYSQL_PWORD" ]; then
    local mysql_login+=" -p$MYSQL_PWORD" 
  fi
  echo $mysql_login
}

function database_list() {
  local show_databases_sql="SHOW DATABASES WHERE \`Database\` NOT REGEXP '$IGNORE_DB'"
  echo $(mysql $(mysql_login) -e "$show_databases_sql"|awk -F " " '{if (NR!=1) print $1}')
}

function echo_status(){
  printf '\r'; 
  printf ' %0.s' {0..100} 
  printf '\r'; 
  printf "$1"'\r'
}

function backup_database(){
    backup_file="$BACKUP_DIR/$TIMESTAMP.$database.sql.gz" 
    output+="$database => $backup_file\n"
    echo_status "...backing up $count of $total databases: $database"
    $(mysqldump $(mysql_login) $database | gzip -9 > $backup_file)
}

function backup_databases(){
  local databases=$(database_list)
  local total=$(echo $databases | wc -w | xargs)
  local output=""
  local count=1
  for database in $databases; do
    backup_database
    local count=$((count+1))
  done
  echo -ne $output | column -t
}

function hr(){
  printf '=%.0s' {1..100}
  printf "\n"
}

#==============================================================================
# RUN SCRIPT
#==============================================================================
mkdir -p /backup
chmod -R 755 /backup
# MYSQL DUMP
delete_old_backups
hr
backup_databases
hr
printf "All backed up!\n\n"