Super primitive database backup script

backup.sh

#!/bin/bash

backup_date=$(date +%s)
defaults_file=./my.cnf
destination=./backups
basename=backup
cleanup=false
cleanup_interval="+30"
dryrun=false
compress=false
verbose=false
declare -a databases

while getopts "b:c:d:i:n:sxjv" opt; do
  case $opt in
    b) destination=$OPTARG;;
    c) defaults_file=$OPTARG;;
    d) databases+=("$OPTARG");;
    i) cleanup_interval=$OPTARG;;
    n) basename=$OPTARG;;
    s) dryrun=true;;
    x) cleanup=true;;
    j) compress=true;;
    v) verbose=true;;
  esac
done

log() {
  if [ "$verbose" = true ]; then
    echo $1
  fi
}

backup_file_path="$destination/$basename-$backup_date.sql"
backup_command="mysqldump --defaults-file=$defaults_file --databases ${databases[*]} > $backup_file_path"
compress_command="bzip2 $backup_file_path"
outdated_backups_command="find $destination -daystart -maxdepth 1 -mtime $cleanup_interval -print"

if [ "$dryrun" = true ]; then
  echo $backup_command
  if [ "$compress" = true ]; then
    echo $compress_command
  fi
  if [ "$cleanup" = true ]; then
    echo "These files would be deleted:"
    $outdated_backups_command
  fi
else
  log "Creating backup file..."
  eval $backup_command
  if [ "$compress" = true ]; then
    log "Compressing backup file..."
    eval $compress_command
  fi
  if [ "$cleanup" = true ]; then
    log "Cleaning up old backups..."
    eval $outdated_backups_command | xargs -r -d "\n" rm
  fi
  log "Done."
fi