if conditions in requirements

[wolfv]

We came across some requirements that use "if" conditions. Should that be handled by this crate?

E.g.

      <rpm:entry name="(tpm2-tools if tpm2-tss)"/>

I actually don't know enough about RPM specs to understand what this is supposed to do.

[dralley]

These are called "boolean dependencies" or "rich dependencies", there's some documentation here:

https://rpm-software-management.github.io/rpm/manual/boolean_dependencies.html

I wouldn't be against adding functions on the Requirement struct to make them easier to handle. The work could likely be re-used in (or shared with) the rpm crate.