[Rpm-maint] [rpm-software-management/rpm] Make the default DB backend macro configurable (#157)

[Panu Matilainen]

Currently if rpm is built with --enable-ndb, all newly created databases are in that format. We'll need more control over the format to enable safe testing which is a prerequisite for wider testing.

We need a macro configurable (%_rpmdb_backend or such) to set the default backend for newly created databases and default to BDB regardless of build-time options to be on the safe side. To convert to another format, changing the macro value to another backend and doing `rpmdb --rebuilddb` should be enough as rebuilddb starts by creating a new db.

It should be possible to arbitrarily switch back and forth between backends by --rebuilddb. I suspect currently it only works going from BDB to NDB because the files from the old database are not cleaned out on rebuild, IIRC. So that might need fixing too.


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