mysql docker container start and wait until ready

mysql-container

#!/bin/bash

MYSQL_ROOT_PASSWORD=root

function docker_container_ip {                                        
  docker inspect "$1" | jq -r '.[0] | .NetworkSettings | .IPAddress'  
}            

echo "Run mysql container"                                                  
mysql_id=$(docker run -d -e MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD mysql) 
mysql_host=`docker_container_ip "$mysql_id"`                                


function wait_until_mysql_ready {                                                            
printf 'Waiting for mysql'                                                                 
while [ 1 ]                                                                                  
do                                                                                           
  printf '.'                                                                                 
  local response=`mysql -h "$mysql_host" -u root -p"$MYSQL_ROOT_PASSWORD" -e "SHOW DATABASES" 2> /dev/null`                                                                               
  if [ $(grep 'information_schema'<<< "$response" -c) -ne 0 ]                                
  then                                                                                       
    printf '\n'                                                                              
    break                                                                                    
  fi                                                                                         
  sleep 1                                                                                    
done                                                                                         
}