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07d2ad30e5
If the daemon is configured to use a mirror for the default (Docker Hub) registry, the endpoint did not fall back to querying the upstream if the mirror did not contain the given reference. For pull-through registry-mirrors, this was not a problem, as in that case the registry would forward the request, but for other mirrors, no fallback would happen. This was inconsistent with how "pulling" images handled this situation; when pulling images, both the mirror and upstream would be tried. This patch brings the daemon-side lookup of image-manifests on-par with the client-side lookup (the GET /distribution endpoint) as used in API 1.30 and higher. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>