I.1. 获得源代码通过Git

使用 Git 你可以从源代码库复制一份完整源代码到你的本机上，这样你就可以离线访问所有的代码历史和分支。这是开发或者测试补丁最为快捷并且灵活的方式。

Git

你将需要一个已经安装的Git，你可以从 http://git-scm.com得到。大多数操作系统已经默认安装有最新版的 Git ，或者在软件包管理系统里提供了下载安装。
为了开始使用Git源码库，从官方的镜像里制作一份克隆：
```
git clone git://git.postgresql.org/git/postgresql.git
```
这将会完全拷贝源到你的本地机器上，所以直到拷贝完成会花费一段时间，尤其当你的网络连接非常慢时候。代码文件会放置在当前目录一个新的名为 postgresql 的子目录里。

Git的镜像同样可以通过HTTP协议来获取，假如你的防火墙阻止你通过Git协议访问。仅需要修改URL的协议为 http，例如：
```
git clone http://git.postgresql.org/git/postgresql.git
```
HTTP协议是效率较低的相比于Git协议，所以使用起来会更慢。
每当你想在系统得到最近更新时， cd 到源目录，运行：
```
git fetch
```

Git 不仅仅获取资源，还能做很多其它的事情。更多详情，参考 Git 手册页，或者查看网站 http://git-scm.com。

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