重装系统后重新关联 GitHub

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重装系统后， 系统盘文件都会被清空，会删除 .ssh 目录下绑定好的 ssh 公钥和私钥，此时 git push 本地仓库，便会报错：

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$ git push
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

对此，需要本地重新关联 GitHub 账号，才能继续 push 本地仓库。

本地创建 ssh key

在命令行窗口输入 ssh-keygen -t rsa -C "your_email@youremail.com"，这里要将 your_email@youremail.com 改为自己指定的邮箱。然后，敲三次回车，就生成了 ssh key。

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$ ssh-keygen -t rsa -C "liupaopao520@163.com"
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/Administrator/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /c/Users/Administrator/.ssh/id_rsa
Your public key has been saved in /c/Users/Administrator/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:v9WQpeyCOJKOJG2vKrCbFfKnIo7tbFnZ4Qnp8LVSU2E liupaopao520@163.com
The key's randomart image is:
+---[RSA 3072]----+
|        E.       |
|       ..        |
|     . .      .  |
|  . o =    . +   |
|*Oo* . .   +     |
|OBB.o     .      |
+----[SHA256]-----+

生成的 ssh key 文件位于 C:\Users\Administrator\.ssh 目录下，打开 id_rsa.pub，复制里面的公钥。

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$ pwd
/c/Users/Administrator/.ssh

$ ls
id_rsa  id_rsa.pub  known_hosts

$ cat id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQDEy......l8xl8s8VEc= liupaopao520@163.com

GitHub 添加 ssh key

进入 GitHub 网站，进入 Account Settings，左边选择 SSH and GPG keys，然后在 SSH keys 分类里，点击 New SSH keys，Title 随便填，粘贴刚才复制的 Key。

打开 git bash，输入 ssh -T git@github.com，验证是否关联成功。看到如下信息，则说明已成功关联 GitHub。

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$ ssh -T git@github.com
Hi HanxuLiu! You've successfully authenticated, but GitHub does not provide shell access.