srpms?

[Ken Teh]

There was a discussion on the issue of srpms or lack of in SL7.  I don't build 
packages much so did not pay attention to it.  I am now in need of an srpm that 
shows how a particular rpm was built.  Specifically, the stuff in the spec file. 
 I need the package for a Fedora 25 system where it is not available except as 
a tarball.

Is there a quick write-up on how one handles this nowadays setting aside the 
pros and cons of this issue?

thanks