91288384_an_RPM_package___FedoraProject__Action
[Stage] src [Reads] %_sourcedir [Writes] %_srcrpmdir [Action] 
This creates a source RPM package (.src.rpm) inside the source RPM directory %_srcrpmdir (usually ~/rpmbuild/SRPMS). These files are needed for reviewing and updating packages.
How to create an RPM package - FedoraProject