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#!/usr/bin/env bash

# Read one ECR tag. Only ImageNotFound is optional; AWS and response errors fail.

set -euo pipefail

REPOSITORY="${1:?repository required}"

TAG="${2:?tag required}"

ALLOW_MISSING="${3:-}"

if [ -n "$ALLOW_MISSING" ] && [ "$ALLOW_MISSING" != '--allow-missing' ]; then

echo 'ERROR: expected --allow-missing or no third argument' >&2

exit 1

export AWS_PAGER=''

aws ecr batch-get-image --repository-name "$REPOSITORY" --image-ids imageTag="$TAG" --output json |

ALLOW_MISSING="$ALLOW_MISSING" python3 -c '

import json, os, re, sys

response = json.load(sys.stdin)

images, failures = response["images"], response["failures"]

if failures:

if not images and len(failures) == 1 and failures[0]["failureCode"] == "ImageNotFound" and os.environ["ALLOW_MISSING"]:

print("")

sys.exit(0)

raise SystemExit("ERROR: ECR image lookup failed: " + ", ".join(f["failureCode"] for f in failures))

if len(images) != 1:

raise SystemExit("ERROR: expected exactly one ECR image")

digest = images[0]["imageId"]["imageDigest"]

if not re.fullmatch(r"sha256:[0-9a-f]{64}", digest):

raise SystemExit("ERROR: invalid ECR image digest")

print(digest)