Hi,
as back-config does currently not have support for the delete operation (config_back_delete() just returns LDAP_UNWILLING_TO_PERFORM currently) I am trying to figure out what is needed to get at least delete support for simple overlays (e.g. ppolicy or memberof) running.
What I am currently doing is: - renumber the indexes of the siblings of the overlay that's going to be deleted - remove the CfEntryInfo of the overlay from the internal config tree - remove the Entry from the underlying LDIF database
Additionally I need to remove the overlay's slap_overinst structure from the overlay list of the backend and in case it was the last overlay, restore the original BackendInfo structure and delete the SLAP_DBFLAG_GLOBAL_OVERLAY flag from the BackendDB structure of the underlying database (for global overlays). Currently I use the overlay_destroy_one() function for this task. This also calls the db_destroy() hook of the overlay which should take are of free resources held by the overlay.
I am a bit unsure about the db_destroy() part. Is that enough or is it needed to call the db_close() hooks (when provided by the overlay) before calling db_destroy()? Did I miss something else? Is anybody else currently working on this?
Up to now I am testing this only with some simpler overlays (memberof, pcache), I assume that deleting overlays that instantiate their own databases (like pcache, translucent(?)) might get a little more hairy.