This was raised by MTG in their testing that dumping the CRL Cache through Kleopatra does not work.
And indeed, what Kleopatra does is to send:
"dirmngr --flush" to clear the CRL Cache.
"gpgsm --call-dirmngr listcrls" to show the CRL Cache.
I can see that flush removes the files in the CRL cache but "gpgsm --call-dirmngr listcrls" lists the same CRL's before and after the flush. Killing dirmngr resolves this.
So I think dirmngr needs to also flush any in memory cache when flushing. I guess the problem is that the flush is called on a new dirmngr instance. Any advice about how Kleo should call the flush?
import http://files.intevation.de/users/aheinecke/aheinecke-2018.pem gpgsm --with-validation -k firstname.lastname@example.org gpgsm --call-dirmngr listcrls dirmngr --flush gpgsm --call-dirmngr listcrls
I think this is low priority because that is mostly a development / testing feature and I don't think that we have any regression here.