Since we can't get rid of all unmet dependencies (at least not in every
possible plugin configuration) the message is more confusing than
helpful. In particular because a detailed warning about plugin features
that failed to load due to unmet dependencies is only logged on level 2.
Unloading libraries calls any library constructor/destructor functions. Some
libraries can't handle that in our excessive unit test use. GnuTLS leaks
a /dev/urandom file descriptor, letting unit tests fail with arbitrary
out-of-resources errors.
This now works because all plugins use the same config namespace.
If <ns>.load_modular is true, the list of plugins to load is determined
via the value of the <ns>.plugins.<name>.load options.
Using includes the following is possible:
charon {
load_modular = yes
plugins {
include strongswan.d/charon/*.conf
}
}
charon-cmd {
load_modular = yes
plugins {
include strongswan.d/charon-cmd/*.conf
}
}
Where each .conf file would contain something like:
<name> {
load = yes
<option> = <value>
}
To increase the priority of individual plugins load = <priority> can be
used (the default is 1). For instance, to use openssl instead of the
built-in crypto plugins set in strongswan.d/charon/openssl.conf:
openssl {
load = 10
}
If two plugins have the same priority their order in the default plugin
list is preserved. Plugins not found in that list are ordered
alphabetically before other plugins with the same priority.
Still log an error message if critical features fail, as loaded
plugins/features are not logged in that case.
This way loaded plugins are printed before failed features and
the relation is easier to make for users. It also allows programs
to log this message on a different level.
With the new implementation the plugins don't have to be listed in any
special order, dependencies are properly resolved. The order only
matters if two plugins provide the same feature.
This allows daemons and other components to register plugin features
like those provided by plugins (following the same lifecycle).
The added features are internally handled like they were added by a
plugin.
Tobias Brunner