Request for greedy plug: certbot:plugin interface

[erica]

Hello! As discussed here, the Certbot snap has an interface (certbot:plugin) that may be connected to multiple slots. The Certbot team publishes several first-party snaps that we’d like to auto-connect to that plug (our certbot-dns-* snaps). We’d like the plug in the Certbot snap to auto-connect to all matching slots in snaps published by us.

We also expect that third parties will create additional snaps that use that interface; those shouldn’t automatically connect.

I see the information page about greedy plugs here; is there specific information we can provide to help this get set up properly?

Thank you!

[erica]

Any update on this? Do we need to write the declarations ourselves?

[galgalesh]

The declarations are written by the store team but first the @reviewers need to vote on this request, I think.

edit: looks like I don’t have the power to summon reviewers so @jdstrand will have to do, I guess.

[jdstrand]

@galgalesh

edit: looks like I don’t have the power to summon reviewers so @jdstrand will have to do, I guess.

I’ve adjusted the reviewers settings so anyone can mention the team.

[jdstrand]

@galgalesh

The declarations are written by the store team but first the @reviewers need to vote on this request, I think.

This requires something from me before the others vote. This is being tracked in our queue and will be addressed soon. Sorry for the delay.

[erica]

Thank you, glad to hear it hasn’t gotten lost.

[jdstrand]

So sorry for the delay!

Since the request only changes the greediness of the auto-connection, and not cross-publisher connections, in the interest of time I simply granted this (@reviewers - please speak up if you feel this is in error).

I chose to use this for the plugs of the snap declaration:

{
  "content": {
    "allow-auto-connection": [
      {
        "plug-attributes": {
          "content": "certbot-1"
        },
        "slot-attributes": {
          "content": "$PLUG(content)"
        },
        "slots-per-plug": "*",
        "slot-publisher-id": [
          "$PLUG_PUBLISHER_ID"
        ]
      },
      {
        "plug-attributes": {
          "content": "$SLOT(content)"
        },
        "slot-publisher-id": [
          "$PLUG_PUBLISHER_ID"
        ]
      }
    ]
  }
}

This limits the greediness to the certbot snap’s content plug that uses content: certbot-1 with the idea that if you add another content plug, it will behave normally (ie, auto-connect if same publisher without greediness).

I tested this and after following the instructions in the other topic, everything seems to work:

Interface                 Plug                                       Slot                              Notes
content[metadata-1]       certbot-dns-digitalocean:certbot-metadata  certbot:certbot-metadata          -
content[metadata-1]       certbot-dns-luadns:certbot-metadata        certbot:certbot-metadata          -
content[certbot-1]        certbot:plugin                             certbot-dns-digitalocean:certbot  -
content[certbot-1]        certbot:plugin                             certbot-dns-luadns:certbot        -

Please test and let us know how it goes.

[erica]

Just tested this myself and all looks good, thank you so much for doing this!

[jdstrand]

Awesome!