[Rpm-maint] [rpm-software-management/rpm] Unpack failure on update can cause unmodified %config files to be erased (Issue #3284)

[Panu Matilainen]

The actual issue is that any file unpack failure during an update can cause unmodified %config files to be deleted on the cleanup stage. This is because normally to-be-installed files are unpacked to a temporary suffix which is then safe to remove, but unmodified config files are handled with FA_TOUCH to only update their metadata instead of rewriting the file, and so must be skipped during cleanup. Affects all rpm >= 4.14 versions AFAICS.

If %_minimize_writes is used, this will have a much wider impact than just unmodified config files.

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