Clear unused overlay2 layers

script.sh

#!/bin/bash

# Set the overlay2 directory path
OVERLAY2_DIR="/var/lib/docker/overlay2"

# Get all folders in overlay2
overlay2_folders=$(ls -1 $OVERLAY2_DIR)

# List all Docker objects (images, containers, volumes, etc.)
docker_objects=$(docker ps -aq)  # All containers, running or stopped
docker_objects+=" $(docker images -q)"  # All images

# Check each Docker object
for hash in $overlay2_folders; do
  is_hash_used=""
  for object in $docker_objects; do
    docker inspect $object | grep -q "$hash" && echo "[OK] $hash" && is_hash_used=1 && break
  done
  test -z "$is_hash_used" && echo "[TO_DELETE] $hash" && mv $OVERLAY2_DIR/$hash ~/to_delete
done

# for object in $docker_objects; do
#     # Get all hashes used by the object
#     object_inspect=$(docker inspect $object)

#     # Merge the hashes into the referenced list
#     for hash in $object_hashes; do
#         if [[ ! " ${referenced_hashes[@]} " =~ " $hash " ]]; then
#             referenced_hashes+=("$hash")
#         fi
#     done
# done

# Now compare and remove unreferenced folders
# for folder in $overlay2_folders; do
#     if [[ ! " ${referenced_hashes[@]} " =~ " $folder " ]]; then
#         echo "Deleting unused overlay2 folder: $folder"
#         rm -rf "${OVERLAY2_DIR}/${folder}"
#     fi
# done

# echo "Cleanup complete."