[Rpm-maint] [rpm-software-management/rpm] RFE: Move transaction processing to a subprocess (#1526)

[Neal Gompa (ニール・ゴンパ)]

Subprocessing a transaction would make this much more brittle, since it would expose RPM to weaknesses in POSIX itself wrt system software data replacement. Think for example if rpm is upgrading rpm: having a separate binary means that we need to design a complex method to handle that the rpm binaries are being replaced, rather than relying on the in-memory program data footprint that comes from DNF using librpm and holding it in memory while it works through everything.

RPM already has locking semantics to implement a "write once, read many" setup, so I'm not sure we actually _need_ to do much more than beef this up with the SQLite database backend.

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