centos中下载源代码包

Centos中各种软件的源代码在：http://vault.centos.org
很多情况下想学习一下Centos中各种软件的源代码，又不想全部下载。
以centos6.6为例：
1）在/etc/yum.repos.d/下建立一个Centos-Vault-Src.repo
[C6.6src-base]
name=CentOS-6.6src - Base
baseurl=http://vault.centos.org/6.6/os/Source
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.6src-updates]
name=CentOS-6.6src - Updates
baseurl=http://vault.centos.org/6.6/updates/Source
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.6src-extras]
name=CentOS-6.6src - Extras
baseurl=http://vault.centos.org/6.6/extras/Source
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

[C6.6src-centosplus]
name=CentOS-6.6src - CentOSPlus
baseurl=http://vault.centos.org/6.6/centosplus/Source
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
enabled=1

2）sudo yum makecache
看第1步设置是否正确

3）下载软件源代码包
例如ls的源代码

3.1）rpm -qf /bin/ls
coreutils-8.4-37.el6.i686
＃说明ls命令的源代码包在coreutils中

3.2) yumdownloader --source coreutils
coreutils-8.4-37.el6.src.rpm

3.3)
#进一步可以安装查看源代码
rpmbuild --rebuild coreutils-8.4-37.el6.src.rpm

3.3)(optional)
rpm -ivh coreutils-8.4-37.el6.src.rpm
cd ~/rpmbuild
cd ~/rpmbuild/SPECS
rpmbuild -ba coreutils.spec

3.3)(optional)
rpm2cpio coreutils-8.4-37.el6.src.rpm| cpio -id
#然后自己逐一编译之
cd coreutils-8.4
patch -Np1 -i ../coreutils-8.4-ls-leak.patch
...

./configure
make