slots-per-plug should be sufficient with "allow-auto-connection"

[Jamie Strandboge]

https://forum.snapcraft.io/t/plug-slot-declaration-rules-greedy-plugs/12438 describes support for 'slots-per-plug' and 'plugs-per-slot' for allow-connection and allow-auto-connection (though today, snapd only honors 'slots-per-plug: *' with allow-auto-connection).

When I tried to use this in plugs:
{
  "serial-port": {
    "allow-auto-connection": {
      "slots-per-plug": "*"
    }
  }
}

The store errored and said: "could not sign assertion (assertion snap-declaration: allow-auto-connection in plug rule for interface "serial-port" must specify at least one of plug-attributes, slot-attributes, slot-snap-type, slot-publisher-id, slot-snap-id, on-classic, on-store, on-brand, on-model)".

I was able to workaround this be using this instead:

{
  "serial-port": {
    "allow-auto-connection": {
     "slot-snap-type": [
       "app"
      ],
      "slots-per-plug": "*"
    }
  }
}

At a minimum, the store should allow specifying my first try, above. It is less clear if the store should error for deny*, *-installation, allow-connection or plugs-per-slot. My inclination would be to enforce "slots-per-plug": "*" with allow-auto-connection, erroring on everything else, but I'll defer to you.

[Daniel Manrique (roadmr)]

Hi,

The "could not sign assertion" message comes from the snap assertion service, we probably need to update that service to allow for what you described.

[Samuele Pedroni (pedronis)]

Because of other work SAS should now be up-to-date, Jamie could you try again?

[Jamie Strandboge (jdstrand)]

This is resolved now.