Cleaner docker registry by only tag latest

clean-registry.bash

#!/usr/bin/env bash
set -e

data="$(dirname "$0")/registry/data"
reg="$data/docker/registry/v2/repositories"

for n1 in $(ls $reg -t); do
  for n2 in $(ls $reg/$n1 -t); do
    repo=$n1/$n2
    tag=$reg/$repo/_manifests/tags/latest/index/sha256
    revs=$reg/$repo/_manifests/revisions/sha256

    for hash in $(ls $tag -t | tail -n +2); do
      echo "rm -> $repo -> $hash"
      rm -rf $tag/$hash
      rm -rf $revs/$hash
    done

    before=$(date -r $tag/$(ls -t $tag) +"%Y-%m-%d %H:%M:00")
    find $revs/ -type d ! -newermt "$before" | xargs rm -rf
  done
done

echo "exec garbage-collect"
docker exec -it ctr-ship.docker-registry bin/registry garbage-collect /etc/docker/registry/config.yml

du -md1 $data