Some bugfixes.

scripts/digest_registry.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+ref="${1:-library/ubuntu:latest}"
+repo="${ref%:*}"
+tag="${ref##*:}"
+acceptM="application/vnd.docker.distribution.manifest.v2+json"
+acceptML="application/vnd.docker.distribution.manifest.list.v2+json"
+token=$(curl -s "https://auth.docker.io/token?service=registry.docker.io&scope=repository:${repo}:pull" | jq -r '.token')
+curl -H "Accept: ${acceptM}" \
+     -H "Accept: ${acceptML}" \
+     -H "Authorization: Bearer $token" \
+     -I -s "https://registry-1.docker.io/v2/${repo}/manifests/${tag}"