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Story #2735

Updated by ipanova@redhat.com about 5 years ago

We state that are able to sync and serve both v1 and v2 content. 

 I tried to docker pull with newer docker client the v1 content and it is not working, unless i install older docker client. 
 The reason why it is not working is that docker client is not making the fail-over to v1 registry because of 302 redirect that eventually server responds with 404 html, but docker client expects a json with specific error code. This prevents docker client to failover to v1 protocol and then therefore therefor to fetch v1 content. 

 In other words the current situation is : it is impossible to docker pull v1 and v2 content with one docker client version. 

 <pre> 
 [ipanova@ina crane]$ pulp-admin docker repo list 

 +----------------------------------------------------------------------+ 
                           Docker Repositories 
 +----------------------------------------------------------------------+ 

 Id:                    synctest 
 Display Name:          None 
 Description:           None 
 Content Unit Counts:  
   Docker Blob:       45 
   Docker Manifest: 75 
   Docker Tag:        96 

 Id:                    v1synctest 
 Display Name:          None 
 Description:           None 
 Content Unit Counts:  
   Docker Image: 27 


 [ipanova@ina crane]$ docker pull localhost:1234/synctest 
 Using default tag: latest 
 latest: Pulling from synctest 
 Digest: sha256:32f093055929dbc23dec4d03e09dfe971f5973a9ca5cf059cbfb644c206aa83f 
 Status: Image is up to date for localhost:1234/synctest:latest 
 [ipanova@ina crane]$ docker pull localhost:1234/v1synctest:1-ubuntu 
 Error response from daemon: error parsing HTTP 404 response body: invalid character '<' looking for beginning of value: "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>404 Not Found</title>\n</head><body>\n<h1>Not Found</h1>\n<p>The requested URL /pulp/docker/v2/v1synctest/manifests/1/1-ubuntu was not found on this server.</p>\n</body></html>\n" 


 </pre> 

 There are just 3 reasons reason which would allow docker client to fallback to v1 protocol 1) 401 unauthorized 2) 404 manifest unknown 3) i do not remember 

 we need to implement 2 case which would look like: 

 <pre> 
     x = {"errors": [{"code": "MANIFEST_UNKNOWN","message": "manifest unknown","detail": {}}]} 

     response = current_app.make_response(json.dumps(x)) 
     response.headers['Content-Type'] = 'application/json' 
     response.headers['Docker-Distribution-API-Version'] = 'registry/2.0' 
     response.status_code = 404 
     return response 
 </pre> 

 In order to allow crane to make such stuff ^^ this would imply changes in pulp docker publish and there would be a new redirect file version. The json metadata would contain tags for schema1_data as well. 
 Some changes in crane logic will need nee to be done accordingly. So before doing blindly the redirect, crane first would check existence of the tag    in schema2_data schema2 data then in schema1_data, then the it would issue instead of 302, the mentioned above 404 and this would allow docker client to make the failover to v1 

 This changes would fix https://pulp.plan.io/issues/2536 

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