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feature doesn't seem to be implemented on RHEL-7, tested with 
yum-utils-1.1.31-24.el7

+++ This bug was initially created as a clone of Bug #710469 +++

It came to my attention that the logic for --source in yumdownloader is not going to work with the repos that we've created in the CDN.  yumdownloader only looks at repos with a label of <base repo>-source.  For example, if you have a repo of binary rpms named rhel-6-workstation-rpms, it expects the SRPMs to be in rhel-6-workstation-rpms-source.  However, in the CDN the repo is named rhel-6-workstation-source-rpms.

One low-tech solution would be to have yum downloader check for this pattern as well.  Something like:

srcrepo = repo.id.replace('-rpms', '-source-rpms')
if srcrepo in src_repos:
    src_repos[srcrepo] = True

Alternatively, we could use yum repo tagging to explicitly list the label of the source repo in the repodata of the binary repo.

 This is fixed in el6, so I guess it's a regression. We forgot to turn the rhn_source_repos default to on, so it's a one line change.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0401.html