Shell script to find docker image descendants

docker_desc.sh

#!/bin/bash
parent_short_id=$1
parent_id=`docker inspect --format '{{.Id}}' $1`

get_kids() {
   local parent_id=$1
   docker inspect --format='ID {{.Id}} PAR {{.Parent}}' $(docker images -a -q) | grep "PAR ${parent_id}" | sed -E "s/ID ([^ ]*) PAR ([^ ]*)/\1/g"
}

print_kids() {
   local parent_id=$1
   local prefix=$2
   local tags=`docker inspect --format='{{.RepoTags}}' ${parent_id}`
   echo "${prefix}${parent_id} ${tags}"

   local children=`get_kids "${parent_id}"`

   for c in $children;
   do
       print_kids "$c" "$prefix  "
   done
}

print_kids "$parent_id" ""

sudo touch /usr/local/bin/docker-tree
sudo chmod +x /usr/local/bin/docker-tree
sudo chown dev /usr/local/bin/docker-tree
curl -L https://gist.githubusercontent.com/bscheshirwork/cc1d7e4f087822a685a8f2cbcef3e01d/raw/5eb7b37455e3af98c8537da998b7c94f6622c68f/docker_desc.sh -o /usr/local/bin/docker-tree