[Rpm-maint] [rpm-software-management/rpm] Make user/group info reliable operation across chroot (PR #2503)

[Panu Matilainen]

One possibility is to (perhaps optionally) fall back to NSS if local lookup fails, for the non-chroot case. 

That said, I'd rather leave that fallback out initially and only add later if it turns out unavoidable. The thing is, NSS in a chroot is a lost cause because doing the first lookup inside the chroot means the we or the alleged helper would try to dlopen() stuff from the chroot, which could be anything at all, or be entirely missing. So if we accept NSS use for packaged files, we'll accept forever having undefined behavior for verify in chroot, which is basically the case we're trying to solve here.

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