github多用户提交错误Permission to repo denied to

背景：同一台电脑的public key同时添加到了github的两个账户，导致user1的仓库没法正常提交。
解决办法：为两个账户分别配置ssh key，配置~/.ssh/config文件（windows下也是这个路径，在git bash中可以识别~）
错误：

$ git push
remote: Permission to user1/python.git denied to user2.
fatal: unable to access 'https://github.com/user1/python.git/': The requested URL returned error: 403

解决：
环境：windows 7+ git bash
1、在github上删除两个账户的ssh key
2、生成两个ssh key
切换到ssh key的目录
$ cd ~/.ssh/
只需要修改文件名为user1_rsa, passphrase留空回车即可。

$ ssh-keygen -t rsa -C "user1"
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/waston/.ssh/id_rsa): user1_rsa
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in user1_rsa.
Your public key has been saved in user1_rsa.pub.
The key fingerprint is:
SHA256:BJ5FGpGBCwM+Vw9769IACYHKoWD8gJURyYuSNOJQjUY user1
The key's randomart image is:
+---[RSA 2048]----+
|=OEB +==o        |
|BBX =.=*         |
|@*=B o+o.        |
|*o+.o ...        |
|.    . .S        |
|      +          |
|     . o         |
|      .          |
|                 |
+----[SHA256]-----+

同样方式生成user2_rsa
3、把user1_rsa_pub的内容上传到github后台, user2同样操作 https://help.github.com/articles/adding-a-new-ssh-key-to-your-github-account/ 4、修改~/.ssh/config文件内容为：

#Default GitHub
Host github.com
HostName github.com
User git
IdentityFile ~/.ssh/user1_rsa
IdentitiesOnly yes

Host github2
HostName github.com
User git
IdentityFile ~/.ssh/user2_rsa
IdentitiesOnly yes

5、添加你的ssh密钥到ssh-agent中
$ eval "$(ssh-agent -s)"
Agent pid 40672
$ ssh-add ~/.ssh/user1_rsa
Identity added: /c/Users/waston/.ssh/user1_rsa (/c/Users/waston/.ssh/user1_rsa)
$ ssh-add ~/.ssh/user2_rsa
Identity added: /c/Users/waston/.ssh/user2_rsa (/c/Users/waston/.ssh/user2_rsa)
6、测试
user1仓库测试:

cat@cat-pc MINGW64 /f/github/python (master)
$ ssh -T github.com
Hi user1! You've successfully authenticated, but GitHub does not provide shell access.
cat@cat-pc MINGW64 /f/github/python (master)
$ git push
Everything up-to-date

user2仓库测试:

$ ssh -T github2
Hi user2! You've successfully authenticated, but GitHub does not provide shell access.
cat@cat-pc MINGW64 /h/z8 (master)
$ git remote -v
origin  git@github.com:user2/z.git (fetch)
origin  git@github.com:user2/z.git (push)
cat@cat-pc MINGW64 /h/z8 (master)
$ git remote set-url origin git@github2:user2/z.git
cat@cat-pc MINGW64 /h/z8 (master)
$ git push
Everything up-to-date

其它：
#提示文件不存在，检查下rsa文件名或者重新生成key
$ ssh -T github2
no such identity: /c/Users/waston/.ssh/user2_rsa: No such file or directory
Permission denied (publickey).

参考：

Git 最著名报错 “ERROR: Permission to XXX.git denied ... - 简书
http://www.jianshu.com/p/12badb7e6c10

Quick Tip: How to Work with GitHub and Multiple Accounts
https://code.tutsplus.com/tutorials/quick-tip-how-to-work-with-github-and-multiple-accounts--net-22574

git - Using Multiple SSH Public Keys - Super User
https://superuser.com/questions/272465/using-multiple-ssh-public-keys

Error: Permission to user/repo denied to user/other-repo - User Documentation

https://help.github.com/articles/error-permission-to-user-repo-denied-to-user-other-repo/