[systemd-devel] [PATCH 0/5] systemd-importd - support for pulling from V2 Dkr registries

Pavel Odvody podvody at redhat.com
Fri May 8 15:31:47 PDT 2015

On Fri, 2015-05-08 at 14:33 -0400, Vincent Batts wrote:
> On 08/05/15 11:31 +1000, Daurnimator wrote:
> >On 8 May 2015 at 01:46, Pavel Odvody <podvody at redhat.com> wrote:
> >>  - To access the V2 registry we need to send a special User-Agent
> >>    docker/1.6.0
> >
> >Is this really required?
> >Can we request they change something server side?
> I would have to double check the behavior on their docker hub, but for
> local registries this user agent header is not required. It is the
> expectation that a docker registry can always be served as a static file
> tree (pull only).
> vb


$ curl -XGET https://registry-1.docker.io/v2/library/node/manifests/latest
<title>404 Not Found</title>
<h1>Not Found</h1>
<p>The requested URL was not found on the server.  If you entered the URL manually please check your spelling and try again.</p>

$ curl -XGET -H"User-Agent: docker/1.6.0" https://registry-1.docker.io/v2/library/node/manifests/latest                                          
{"errors":[{"code":"UNAUTHORIZED","message":"access to the requested resource is not authorized","detail":[{"Type":"repository","Name":"library/node","Action":"pull"}]}]}

I actually added a little clarification in my 5th patch:

"User-Agent: do" /* otherwise we get load-balanced(!) to a V1 registyry */ 
(I got this information from Andy G.)

The second request obviously fails due to the bearer token not being provided,
but at least we can see that we're hitting the correct endpoint here.

I think that this is the correct behavior, since the original systemd-pull 
workflow was to check the Hub first and obtain the token, which I'm simply
following here, however the token is now obtained from a separate endpoint.

The thing is that the argument is --dkr-index-url, so we're actually specifying
the Hub URL here and there's no way to specify a registry alone.
(the "mirror" registry is received in HTTP headers from the Hub)

Sounds like a topic for another patch?

I hope that the pull-only policy will be relaxed soon :) A lot of roundtrips ...

Pavel Odvody <podvody at redhat.com>
Software Engineer - EMEA ENG Developer Experience
5EC1 95C1 8E08 5BD9 9BBF 9241 3AFA 3A66 024F F68D
Red Hat Czech s.r.o., Purky┼łova 99/71, 612 45, Brno

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