RFE: Add support for generating version range dependencies

[ignatenkobrain]

Currently gem2rpm generates multiple lines if one dependency required which leads to problems.

RPM 4.14 (since F27) will get ability to specify things like BuildRequires: (rubygem(foo) >= 5.1 with rubygem(foo) < 5.3), or even more complicated cases would work as well: BuildRequires: ((rubygem(foo) >= 5.1 with rubygem(foo) < 5.3) or (rubygem(foo_ext) >= 5.1 with rubygem(foo_ext) < 5.3))

[voxik]

Several things:

1. The generated BR are commented out by default and used more or less just as scaffold for packager.
2. Versioned BR are generally discouraged [1].
3. Is the "with" operator actually approved? Is it mentioned in guidelines? Support of RPM is one thing and guidelines are another thing (you remember tilde in versions, right?)

[ignatenkobrain]

Versioned BR are generally discouraged [1].

Thanks for pointer, I will make sure that it is updated when we will get with richop approved.

Is the "with" operator actually approved? Is it mentioned in guidelines? Support of RPM is one thing and guidelines are another thing (you remember tilde in versions, right?)

No, it's not yet implemented in RPM, but will be very soon. It's not mentioned in guidelines, but https://fedoraproject.org/wiki/Changes/Packaging_Rust_applications_and_libraries explicitly mention this and this change has been already approved by FESCo. And supporting with is only way how we will get rust packaging in Fedora.

---

At this point I'm waiting for final version of with richop support. Once it is there, I will submit Rust packaging guidelines + some other wiki pages for FPC approval.

[ignatenkobrain]

P.S. I created this bug just for feature to be implemented, doesn't have to be turned on by default. So once FPC approves it, we could just flip the switch on.

[ignatenkobrain]

@voxik btw, this functionality already available in F27+ RPM/DNF/etc., so you can already try it locally. I'm still trying to get rel-eng support for it.