#!/bin/bash

# Optional: prune Docker
docker volume prune -af 2>&1 > /dev/null
docker image prune -af 2>&1 > /dev/null
docker builder prune -af 2>&1 > /dev/null

# Set field seperator to new line
IFS=$'\n'

# Get 25 largest directories in ./overlay2
clear
echo "Searching for large directories.."
overlay=($(du -sh /var/lib/docker/overlay2/* | sort -hr | head -n 25))

clear
echo "Containers that use a lot of space:"

# Iterate through lines
for layer in "${overlay[@]}"; do

   # Extract size
   size=$(echo $layer | awk '{print $1}')

   # Extract layer ID
   layer_id=$(echo $layer | awk '{print $2}' | sed 's|/var/lib/docker/overlay2/||g')

   # Extract container name
   container_name=$(docker inspect $(docker ps -qa) |  jq -r 'map([.Name, .GraphDriver.Data.MergedDir]) | .[] | "\(.[0])\t\(.[1])"' \
    | grep -w $layer_id | awk '{print $1}' | sed 's|/||g')

   # Filter out layers without container
   if [[ -n $container_name ]]; then
      echo "$size $container_name ($layer_id)"
   fi
done