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Here's a proof-of-concept implementation of "docker pull" in bash (YMMV, I think it has broken since I wrote it): https://gist.github.com/tlrobinson/c85dca269f4405ad4201

Looks good!

I'd marked 'docker pull' as out of scope because I thought it would be fairly hard to interface with their API from bash, looks like I was wrong.

The only hard bit is parsing the JSON, which I use jq for (http://stedolan.github.io/jq/)

I think the v2 API requires hitting an auth endpoint too.

There are some images still in registry v1, I recon a problem like that where it gives you another URL