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David Johnson authored
We try to emulate the standard Docker CLI's image handling. Thus, if user specifies an image like 'ubuntu', we turn that into 'ubuntu:latest'. If user does not supply a registry host, we try 'registry.hub.docker.com'. If they do not specify a registry host or specify a registry host that is either registry-1.docker.io or registry.hub.docker.com, and their image does not contain a /, we prepend 'library/' to it (I *think* this is the right heuristic, but it's inference). For Dockerfiles, we must be able to download it, and it must contain a line matching ^\s*FROM (i.e. a valid FROM instruction, which all Dockerfiles must have). We try to support DOS-mode textfiles too, but only ASCII. Might need to loosen these checks.
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