mac更新系统后git出现的一系列问题

1.xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

1.解决方法：

打开命令终端运行 xcode-select --install 回车后，系统弹出下载xcode组件，点击确认，下载完成后即可。 mac中很多软件都需要依赖xcode的先关组件。

2.Please make sure you have the correct access rights；git 报 Permission denied (publickey).

终端执行git pull,git push命令出错

1 Update failed
2 XXXXXXX: Permission denied (publickey).
3 Could not read from remote repository.
4 Please make sure you have the correct access rights
5 and the repository exists.

一、问题出现原因

查询资料得知任何运行OpenSSH 8.8 或更新版本的系统默认使用 SHA-1 哈希算法禁用 RSA 签名。之前的命令，不再适用，算法导致旧的RSA签名无效。

二、解决步骤

删除.ssh文件夹重新生成
使用ed25519的算法生成密钥，之后再直接复制密钥去对应的机器。
代码如下：

 1 ssh-keygen -t ed25519 
 2 Generating public/private ed25519 key pair.
 3 Enter file in which to save the key (/Users/nathan15/.ssh/id_ed25519): 
 4 Created directory '/Users/nathan15/.ssh'.
 5 Enter passphrase (empty for no passphrase): 
 6 Enter same passphrase again: 
 7 Your identification has been saved in /Users/nathan15/.ssh/id_ed25519
 8 Your public key has been saved in /Users/nathan15/.ssh/id_ed25519.pub
 9 The key fingerprint is:
10 SHA256:8i/vdXHhOE5BEDWPWtJFr/Rm8jK6dm43fAlgXQlKKsU nathan15@JNPG67WMJG
11 The key's randomart image is:
12 +--[ED25519 256]--+
13 |        .. ++=oo.|
14 |        .Eo + =o.|
15 |       . . o.=oo.|
16 |        .  o+o+o.|
17 |      . S ...++.=|
18 |       o    o..B |
19 |        .   ..* o|
20 |        .. ..oo*o|
21 |         ++.o=..o|
22 +----[SHA256]-----+

在文件夹中是看不到.ssh文件

可以执行此命令查看.ssh文件内容

1 cat ~/.ssh/id_ed25519.pub