[1.17.0-rc1] Portainer can't connect to Gitea Container registry

[helmut72]

Description

Portainer shows following message when adding a Gitea Container registry:

Portainer was not able to use this registry management features. You might need to update the configuration used by Portainer to access this registry.

Note: Portainer registry management features are only supported with registries exposing the [v2 registry API](https://docs.docker.com/registry/spec/api/).

Gitea Version

1.17-rc1

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

Gitea from Docker

Database

No response

[lunny]

What's the registry url?

[helmut72]

Using the same url like on my own Docker registry registry.example.com and in your docs: gitea.example.com.

Both with authentication. Then I wanted to select browse in Portainer and the message appears on gitea.example.com.

Edit: Could it be that browsing in the registry isn't possible?

[KN4CK3R]

/v2/_catalog is not implemented if that endpoint is needed. Is there a way to test your bug with Portainer CE or only with the business version?

[helmut72]

Browsing is only supported with business version. Using that because it's free for 5 nodes and it comes with good a good registry browser. I'm limited on time for debugging, will try to do it next days.

[helmut72]

Back to an SSH for an hour. I've enabled access log in Gitea, but just got this log entry when I want to start browsing with Portainer when the error appears:

"OPTIONS /v2/ HTTP/1.1" 405 0

[Fogapod]

"OPTIONS /v2/ HTTP/1.1" 405 0

Do you have CORS enabled in gitea config?

[helmut72]

I don't have CORS enabled, then it should be disabled.

[KN4CK3R]

I added support for /v2/_catalog and got some problems which prevent a PR but in general it works.
Github/Gitlab may got the same problems which may be the reason they don't provide this endpoint.

[helmut72]

Wow! But it's up to you. I never used Github/Gitlab registry, just the container image from Docker and I'm used to browse the registry.