Check for build file modifications after %check

[Manthey, Norbert]

Dear all,

due to the recent xz-utils supply chain problem, we looked into
modifying the rpmbuild tool to fail the build if relevant files are
modified during the '%check' phase. We found a similar request in
github: https://github.com/rpm-software-management/rpm/issues/3010

Is there any discussion about what approach to follow, and how to close
the identified gap?

Instead of jailing the process, we wondered whether hashing and
validating the existing files might be a viable, and more easy to
provide, building block. We provided a very simple and incomplete proof
of concept, which works for small packages:
https://github.com/rpm-software-management/rpm/pull/3039

Best,
Norbert



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