bashup/bashup-backup-mysql.sh

#!/bin/bash
#
# Bashup - A set of bash scripts for managing backups.
# https://git.stack-source.com/msb/bashup
# MIT License Copyright (c) 2021 Matthew Saunders Brown

# load include file
source $(dirname $0)/bashup.sh

bashup::set_existing_backups
bashup::set_retention_array

# create backup for today
if [[ " ${retention_array[@]} " =~ " ${today} " ]]; then

  # create backup (date) dir if it doesn't already exist
  if [ ! -d "$backup_storage_dir/$today" ]; then

    mkdir $backup_storage_dir/$today

  fi

  # only proceed if mysql has not already been backed up
  if [[ ! -d $backup_storage_dir/$today/mysql ]]; then

    mkdir $backup_storage_dir/$today/mysql
    mysqladmin --defaults-extra-file=$defaults_extra_file refresh

    # create array of all existing databases
    databases=($(mysql --defaults-extra-file=$defaults_extra_file -E -e 'show databases;'|grep : |awk '{ print $2 }' |tr '\n' ' '));

    for database in "${databases[@]}"; do

      if [[ " ${exclusions[@]} " =~ " ${database} " ]]; then
        # do nothing, db is in exclusions array
        one=1;
      else
        mysqldump --defaults-extra-file=$defaults_extra_file --opt --quote-names --events --databases $database | gzip > $backup_storage_dir/$today/mysql/$database.sql.gz
      fi

    done

  fi

fi

# remove expired backups
for existing_backup in "${existing_backups[@]}"; do

  if [[ " ${retention_array[@]} " =~ " ${existing_backup} " ]]; then

    # keep $existing_backup, do nothing
    one=1;

  else

    if [[ -d $backup_storage_dir/$existing_backup/mysql ]]; then

      rm -r $backup_storage_dir/$existing_backup/mysql

    fi

    if [ -z "$(ls -A $backup_storage_dir/$existing_backup)" ]; then

      rm -r $backup_storage_dir/$existing_backup

    fi

  fi

done

bashup::unmount_storage_dir

exit 0