这是git的文件目录，大家可以看一看
https://opensource.wandisco.com/centos/7/git/x86_64/
执行命令1:
yum install http://opensource.wandisco.com/centos/7/git/x86_64/wandisco-git-release-7-2.noarch.rpm
执行命令2:
yum -y install git
执行命令3:
git version
得到：git version 2.31.1