dovecot - Aug 2014 - Need help to compile and install a minimal dovecot imap plugin

I am trying to create a plugin that adds a new IMAP capability. So far I have
this:



const char *foo_plugin_version = DOVECOT_ABI_VERSION;

static struct module *foo_module;
static imap_client_created_func_t *next_hook_client_created;

static void foo_client_created(struct client **client)
{
    str_append((*client)->capability_string, " XFOO");

    if (next_hook_client_created != NULL) {
      next_hook_client_created(client);
    }
}

void foo_plugin_init(struct module *module)
{
  i_info(?init?);
  foo_module = module;
  next_hook_client_created = imap_client_created_hook_set(foo_client_created);
}

void foo_plugin_deinit(void)
{
  i_info(?deinit?);
  imap_client_created_hook_set(next_hook_client_created);
}

const char foo_plugin_binary_dependency[] = "imap?;



On Fedora 20, with the dovecot and dovecot-devel packages installed, I compile
this with:

cc -Wall -shared -fPIC -DHAVE_CONFIG_H -I/usr/include/dovecot -o
lib20_foo_plugin.so foo-plugin.c



And then install with:

sudo cp lib20_foo_plugin.so /usr/lib64/dovecot/

(I also have mail_plugin_dir = /usr/lib64/dovecot in 10-mail.conf)



I enable this plugin in /etc/dovecot/conf.d/20-imap.conf with:

protocol imap {
  mail_plugins = $mail_plugins foo
}


But ? nothing happens. No warnings, no errors, no crashes.

How do I debug this? Am I missing something obvious?

Does the naming of the plugin matter?

 S.

> On Aug 30, 2014, at 1:36 PM, Stefan Arentz <stefan at arentz.ca>
wrote:
> 
> I am trying to create a plugin that adds a new IMAP capability.
To get a much simpler example working, I?ve created a very simple ?empty? plugin
to get the basics works.

https://github.com/st3fan/dovecot-empty-plugin
<https://github.com/st3fan/dovecot-empty-plugin>

This compiles, but there is no way I can get it to actually load.

On Ubuntu 12.04.5 I have moved the empty_plugin.so to /usr/lib/dovecot/modules
and I have added it to the dovecot configuration as follows:

protocol imap {
	mail_plugins = $mail_plugins empty
}

In /etc/dovecot/conf.d/20-imap.conf

No results however.

Should it actually be possible to add a new plugin to an existing install of
Dovecot? Or is the plugin list hardcoded or somehow fixed?

 S.