参考：
https://github.com/google/earthenterprise/wiki/Development:-Git-Contributions
在linux中，通过ssh-agent方式连接到github，使用自己的账户fork的Repository
以gee为例子。
ssh-keygen -t ed25519 -C "[email protected]"
/root/.ssh/id_ed25519 // id_ed25519可以自己设置
提示设置password:eval "$(ssh-agent -s)"
提示：Agent pid 9360
ssh-add ~/.ssh/id_ed25519
提示：
Enter passphrase for /root/.ssh/id_ed25519:
Identity added: /root/.ssh/id_ed25519 ([email protected])cat .ssh/id_ed25519.pub
拷贝：打印出来的内容
Adding a new SSH key to your GitHub account
在浏览器中，打开github--account--settings--SSH and GPG keys---SSHE
把上面拷贝的内容黏贴进去
title自己填写在https://github.com/google/earthenterprise 页面点击 fork，在自己的账户形成一个fork版本
即：https://github.com/aganliang/earthenterprise
git clone [email protected]:aganliang/earthenterprise.git
提示：
正克隆到 'earthenterprise'...
The authenticity of host 'github.com (192.30.255.113)' can't be established.
RSA key fingerprint is SHA256:nThb****xdCARLviKw6E5SY8.
RSA key fingerprint is MD5:16:27:ac:a5:******4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,192.30.255.113' (RSA) to the list of known hosts.
remote: Enumerating objects: 14655, done.
remote: Total 14655 (delta 0), reused 0 (delta 0), pack-reused 14655
接收对象中: 100% (14655/14655), 329.39 MiB | 6.95 MiB/s, 完成.
处理 delta 中: 100% (7102/7102), 完成.
正在更新文件: 100% (9739/9739), 完成.
过滤内容: 100% (48/48), 461.69 MiB | 4.95 MiB/s, 完成.
// move into the repository directory
cd earthenterprise
// set the upstream
git remote add upstream git://github.com/google/earthenterprise.git
使用方法：
git checkout master
git fetch upstream
git pull upstream master
git push
git fetch upstream --tags
git push --tags