[Rpm-maint] [rpm-software-management/rpm] RFE: Depenencies matching to system properties out side of packages (#446)

[Florian Festi]

This has come up in #438 
For now there is no way to use the dependency system to configure the system depending on hardware or other properties. There is something like this in libzypp (used by openSUSE) which injects system Provides into the transaction.
Quoting from #438:
Main use of such a mechanism will installing packages for hardware support based on the presence of said hardware. This will in most cases require pattern matching as addressing each hardware variant is not practical. IIRC libzypp does have some special idiom for this that uses patterns.
The next thing is that most package installations happen on an empty system. So any mechanism that relies too heavily on scripts/programs on the system is doomed to fail. Especially as the dependency resolution is done before anything gets installed.

One possible implementation could be a "exists(FNMATCH)" special name. That would look into the actual file system and not rely on the rpm database. But someone still needs to evaluate if this is feasible and actually solving the real world use cases - especially during first installation.

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