centos-release 套件實例

1. 下載 SRPM 套件

   [dywang@dywH ~]$ cd rpmbuild/
   [dywang@dywH rpmbuild]$ wget http://dy.csie.cyut.edu.tw/moodle23/dywang/download/centos-release-6-4.el6.10.dyw.src.rpm
   

2. 安裝 SRPM 套件

   [dywang@dywH rpmbuild]$ rpm -ivh centos-release-6-4.el6.10.dyw.src.rpm 
      1:centos-release         ########################################### [100%]
   

3. 解打包壓縮

   [dywang@dywH rpmbuild]$ cd SOURCES/
   [dywang@dywH SOURCES]$ tar zxvf centos-release-6-4.tar.gz 
   centos-release-6/CentOS-Base.repo
   centos-release-6/CentOS-Debuginfo.repo
   centos-release-6/CentOS-Media.repo
   centos-release-6/CentOS-Vault.repo
   centos-release-6/EULA
   centos-release-6/GPL
   centos-release-6/RPM-GPG-KEY-CentOS-6
   centos-release-6/RPM-GPG-KEY-CentOS-Debug-6
   centos-release-6/RPM-GPG-KEY-CentOS-Security-6
   centos-release-6/RPM-GPG-KEY-CentOS-Testing-6
   

4. 修改 initscript 規格檔，此規格檔已修改過，可依自己的需求再修改，在 install 段落加入自己的 repo server，由於三個 repo server 內容都一樣，目的只在於若本地端存在，就不需要透過遠端 server 下載套件，以加快速度，其 skip_if_unavailable=1 是設定 repo server 無法連線就跳過，否則只要有一 server 無法連線就不能安裝。priority=n 則是指定repo server 的優先順序，n 可以從 1 到 99，數字越小越優先，不過要安裝 yum-plugin-priorities 套件才能生效，所以增加相依套件要求 Requires: yum-plugin-priorities。

   [dywang@dywH SOURCES]$ vim ../SPECS/centos-release.spec 
   Requires:   yum-plugin-priorities
   ........
   Release:        4%{?dist}.10.dyw
   ........
   %install
   ........
   
   # create /etc/system-release and /etc/dywang-release
   echo "De-Yu Wang Linux %{full_release_version} release (Taiwan)" > $RPM_BUILD_ROOT/etc/dywang-release
   ln -s dywang-release $RPM_BUILD_ROOT/etc/centos-release
   ln -s dywang-release $RPM_BUILD_ROOT/etc/system-release
   # write cpe to /etc/system/release-cpe
   echo "cpe:/o:centos:linux:%{version}:%{?beta:%{beta}}%{!?beta:GA}" > $RPM_BUILD_ROOT/etc/system-release-cpe
   
   # create /etc/issue and /etc/issue.net
   cp $RPM_BUILD_ROOT/etc/dywang-release $RPM_BUILD_ROOT/etc/issue
   echo "Kernel \r on an \m" >> $RPM_BUILD_ROOT/etc/issue
   cp $RPM_BUILD_ROOT/etc/issue $RPM_BUILD_ROOT/etc/issue.net
   echo >> $RPM_BUILD_ROOT/etc/issue
   
   # copy yum repos to /etc/yum.repos.d
   mkdir -p $RPM_BUILD_ROOT/etc/yum.repos.d/repotmp
   for file in *.repo; do
       install -m 644 $file $RPM_BUILD_ROOT/etc/yum.repos.d/repotmp
   done
   # create dywang repo
   cat > $RPM_BUILD_ROOT/etc/yum.repos.d/dywang.repo << EOF
   [dywlocal]
   name=De-Yu Wang Local
   baseurl=ftp://deyu.wang/pub/centos6/
   gpgcheck=0
   priority=1
   skip_if_unavailable=1
   [dywpxe]
   name=De-Yu Wang PXE
   baseurl=ftp://192.168.1.254/pub/centos6/
   gpgcheck=0
   priority=20
   skip_if_unavailable=1
   [dywang]
   name=De-Yu Wang
   baseurl=http://dy.csie.cyut.edu.tw/centos6/
   gpgcheck=0
   priority=30
   skip_if_unavailable=1
   EOF
   

5. 重建 centos-release RPM 及 SRPM 二進位檔

   [dywang@dywH SOURCES]$ rpmbuild -ba --clean --target=$(uname -m) ../SPECS/centos-release.spec
   

6. 查看新產生的 centos-release RPM 及 SRPM 二進位檔

   [dywang@dywH SOURCES]$ ll ../RPMS/x86_64/centos* ../SRPMS/centos*
   -rw-r--r--. 1 dywang dywang 19667 Jan 28 10:57 ../RPMS/x86_64/centos-release-6-4.el6.10.dyw.x86_64.rpm
   -rw-r--r--. 1 dywang dywang 18044 Jan 28 10:57 ../SRPMS/centos-release-6-4.el6.10.dyw.src.rpm