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

[Demi Marie Obenour]

> > I'm concerned that re-implementing parts of rpm has the potential to double the surface area for bugs. I get that writing code in C is more difficult and error prone than other languages.
> 
> This has generally been borne out to be true, so I generally will advocate for people to _not_ take the rpm-ostree/rpm-oxide approach, as it leads to broken user experiences.

I wrote rpm-oxide because of the large number of memory unsafety bugs found in librpm, together with the slow speed at which they have been patched.  I believe rpm-ostree had to reimplement much of librpm because there is no reasonable way to use librpm from a multithreaded program.

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