So we want to use it for Mumble, but also for the mailserver lxc container.

It's applicable to every jail/container/chroot/constrained environment where a symlink isn't possible.

We're in November/December.

I'd list Certbot, the Let's encrypt client here.

We implement the interface.

So describe here briefly our implementation goals.

The description do that very well by the way.

We probably need to check here we've in the config the target directory, if not we should raise MisconfigurationError.

As we won't use the others, we can avoid to document them.

Implement this.

The logger object can be used here to explain what we are doing.

logger.info("Copying certificate files")

Here we should instead raise a PluginError.

By the way, plugins shouldn't print anything directly to stdout, instead they should use the logger interface.

that's more_info I think.

Enhancements are a way to "improve" the target situation (for example edit config files to declare the certificate). We don't do that here.

Ah yes, okay okay, a different implementation for Mumble and the mailserver is perhaps needed if we want to do this :p

raise PluginError instead

Is the target folder enough?

Services configuration files expect sometimes other patterns to name certificates, for example private.pem and public.pem files.

Probably better to let in the configuration set the final name.

Also useful not to have to modify servers config for 0001 Let's encrypt certificates names.