Traditionally rpm-related daemons have been watching for changes in
/var/lib/rpm/Packages file, but hardcoded paths were always ugly and no longer
feasible at all because of multiple supported backends with different file
names and semantics over them.
We recently added rpmdbCookie() API for checking if the database has changed,
and rpmdbStat() and rpmdbFStat() go to the same direction as well, but none of
these serve the daemon case particularly well as it should not be necessary to
poll.
I know sqlite supports notification hooks, and IIRC BDB does too. I think ndb
doesn't keep track of who has the db open and no idea how easy/hard
implementing that would be. @mlschroe, thoughts ?
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