没有实际安装，可以使用msysgit代替
1：安装git
2：安装cygwin window下的unix模拟环境
3：Gitosis 是一套用来管理 authorized_keys文件和实现简单连接限制的脚本
- msysGit - is the name of this project, a build environment for Git for Windows, which releases the official binaries
- MinGW - is a minimalist development environment for native Microsoft Windows applications.
- MSYS - is a Bourne Shell command line interpreter system, is used by MinGW (and others), was forked _in the past_ from Cygwin
- Cygwin - a Linux like environment, which was used in the past to build Git for Windows, nowadays has no relation to msysGit