[Rpm-maint] [rpm-software-management/rpm] RPM with Copy on Write (#1470)

[Demi Marie Obenour]

> As I've said before in rpm-ostree we already carry a re-implementation of various chunks of librpm as part of the transactional/anti-hysteresis model. The concept of carrying "pristine" RPMs has been implemented from the start by importing RPMs into ostree commits, then using plain old hardlinks. For `apply-live` updates, that also inherently implements the "unpack all files, rename() into place" model.

Curious: what parts of librpm are *not* reimplemented?  In particular, are there any parts (other than rpmdb operations) that are neither reimplemented by rpm-ostree nor by rpm-oxide?

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