Cleanup AWS ECR untagged images

cleanup_ecr_untagged_images.sh

#!/bin/bash

function delete_image () {
  local repo_name=$1
  local image_digest=$2
  echo "${image_digest}"
  aws --out=json \
    ecr \
    batch-delete-image \
    --repository-name="${repo_name}" \
    --image-ids \
    imageDigest="${image_digest}"
}

# Check requirements
function require {
  command -v "$1" > /dev/null 2>&1 || {
    echo "Some of the required software is not installed:"
    echo "    please install $1" >&2;
    exit 1;
  }
}

# Check for AWS, AWS Command Line Interface
require aws

# Check for jq, Command-line JSON processor
require jq

repositories=$(aws --out=json \
  ecr \
  describe-repositories | \
  jq '.repositories[].repositoryName' | \
  sed 's/"//g'
)

for repo_name in ${repositories}
do
  echo "${repo_name}"
  images=$(aws --out=json \
    ecr \
    list-images \
    --repository-name="${repo_name}" | \
    jq '.imageIds[] | select(.imageTag == null) | .imageDigest'
  )

  # alternative
  # images=$(aws --out=json \
  #   ecr \
  #   list-images \
  #   --repository-name="${repo_name}" \
  #   --filter tagStatus=UNTAGGED | \
  #   jq '.imageIds[] | .imageDigest'
  # )

  for image_digest in ${images}
  do
    delete_image "${repo_name}" "${image_digest}"
  done
done