CentOS系统如何获取命令的源代码

# CentOS-Base.repo  
#  
# The mirror system uses the connecting IP address of the client and the  
# update status of each mirror to pick mirrors that are updated to and  
# geographically close to the client.  You should use this for CentOS updates  
# unless you are manually picking other mirrors.  
#  
# If the mirrorlist= does not work for you, as a fall back you can try the   
# remarked out baseurl= line instead.  
#  
#  
  
[base]  
name=CentOS-$releasever - Base  
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os  
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
#released updates   
[updates]  
name=CentOS-$releasever - Updates  
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates  
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
#additional packages that may be useful  
[extras]  
name=CentOS-$releasever - Extras  
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras  
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
#additional packages that extend functionality of existing packages  
[centosplus]  
name=CentOS-$releasever - Plus  
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus  
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/  
gpgcheck=1  
enabled=0  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
#contrib - packages by Centos Users  
[contrib]  
name=CentOS-$releasever - Contrib  
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib  
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/  
gpgcheck=1  
enabled=0  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  

该文件中有两个变量：releasever和basearch，分别表示release版本和分支，如本人的机子上，这两个值分别为6和i386。注意，releasever并不会细分为次级版本，即不会是6.6之类的。

从该文件的内容可以知道，该文件共有5个节，也就是说本人的机子的软件来源有5处，分别为base、updates、extras、centosplus和contrib。所以只需要为如下的5处软件源指定其源代码的源即可。在文件的末尾加上如下的内容：

[base-src]  
name=CentOS-$releasever - Base src  
baseurl=http://vault.centos.org/6.6/os/Source/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
[updates-src]  
name=CentOS-$releasever - Updates src-centos  
baseurl=http://vault.centos.org/6.6/updates/Source/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
[extras-src]  
name=CentOS-$releasever -  Extras src-centos  
baseurl=http://vault.centos.org/6.6/extras/Source/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
[centosplus-src]  
name=CentOS-$releasever - Plus src-centos  
baseurl=http://vault.centos.org/6.6/centosplus/Source/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  
  
[contrib-src]  
name=CentOS-$releasever - Contrib src-centos  
baseurl=http://vault.centos.org/6.6/contrib/Soruce/  
gpgcheck=1  
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6