# to check a validation of a rpm package from redhat or not
$ rpm -qi firefox
Name        : firefox                      Relocations: (not relocatable)
Version     : 3.0.18                            Vendor: Red Hat, Inc.
Release     : 1.el5_4                       Build Date: Thu 04 Feb 2010 08:58:36 PM CST
Install Date: Sat 20 Feb 2010 10:07:06 AM CST      Build Host: ls20-bc2-14.build.redhat.com
Group       : Applications/Internet         Source RPM: firefox-3.0.18-1.el5_4.src.rpm
Size        : 15222260                         License: MPLv1.1 or GPLv2+ or LGPLv2+
Signature   : DSA/SHA1, Tue 09 Feb 2010 04:48:54 PM CST, Key ID 5326810137017186
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
URL         : http://www.mozilla.org/projects/firefox/
Summary     : Mozilla Firefox Web browser.
Description :
Mozilla Firefox is an open-source web browser, designed for standards
compliance, performance and portability.

yum install rpm-build rpmdevtools

# [How to create repository of source packages ?](https://access.redhat.com/solutions/2026833)
 # cat /etc/yum.repos.d/srpms.repo
  [rhel-src]
  name=Red Hat Enterprise Linux $releasever - $basearch - Source
  baseurl=http://ftp.redhat.com/pub/redhat/linux/enterprise/$releasever/en/os/SRPMS/
  enabled=1
  gpgcheck=1
  gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
 # rm -rf /var/cache/yum/*
 # yum clean all
  # reposync --repoid=rhel-src --source
 The Result of the command should be as below,
 # reposync --repoid=rhel-src --source
 [rhel-src: 1     of 6404  ] Downloading 389-ds-base-1.2.10.2-15.el6.src.rpm
 389-ds-base-1.2.10.2-15.el6.src.rpm
 [rhel-src: 2     of 6404  ] Downloading 389-ds-base-1.2.10.2-18.el6_3.src.rpm