Treat 'index.docker.io' repo names as 'docker.io' #874
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Fixes the problem described in docker/compose#1622 (comment). Auth lookups were failing for private images specified as
docker.io/username/image
.I'm still a bit unsure as to exactly how we're supposed to treat each type of key we encounter in an auth file (e.g. whether we're supposed to strip all URLs of scheme and path, or just special-case the Docker index). I had a go at reading the Docker client code but it's hard to follow. So I'm not 100% sure we're doing the right thing here.