delete old docker images

delete-old-docker-images.sh

#!/bin/env bash

IFS='
'
long_ago=`date +%Y-%m-%d --date='2 weeks ago'`
for image in $(docker images --format '{{.CreatedAt}}|{{.Repository}}:{{.Tag}}')
do
  created=`echo ${image%|*} | grep -oP "^[^\s]+"`
  tag=${image#*|}
  if [ -z "$created" ] || [ -z "$tag" ]; then
    continue
  fi
  if [[ $created > $long_ago ]]; then
    echo "delete old image: $image"
    docker rmi $tag || true
  fi
done

docker prune images doesn't seem to support the until=24h filter, so I created this shell script to do roughly the same job.