ConnectedSlotSnippet not invoked when connecting two snaps

[Jonathan Cave]

I have a slot declared on a gadget snap of type gpio, for example:

name: gadget-snap
...
slots:
  my-gpio:
    interface: gpio
    number: 346
...

I install a snap with a plug that wants to use this slot:

name: app-snap
...
apps:
  my-app:
    command: gpio-up
    plugs: [gpio]
...

When the plug and slot are connected I would expect that ConnectedSlotSnippet is called on gadget-snap. Currently it is not. In this particular example the result is that the code in ConnectedSlotSnippet for the gpio interface [1] is not called and the gpio is not exported.

[1] https://github.com/snapcore/snapd/blob/master/interfaces/builtin/gpio.go#L129

[Zygmunt Krynicki (zyga)]

I believe this is not the case.

This pull request https://github.com/snapcore/snapd/pull/1951 contains a regression test for this that shows we do call the ConnectedSlotSnippet method.

Details start at: https://github.com/snapcore/snapd/pull/1951/files#diff-d63f90d47aab6c5372ae154516d8d43bR105