GitUp & SSH

今天上午由于 SouceTree 一直无法 push 成功，无奈开始搜寻新的 git 客户端，试过 Tower和 GitHub Desktop 后，还是觉得 GitUP 最简单、易用。

官网这样描述它的优点：

使用 GitUp，您将获得一个真正高效的 Mac 版 Git 客户端：
一个实时的交互式回购图（修改，重新排列，修正，合并提交…）
几乎所有操作（甚至变基和合并）的无限撤消/重做
Time Machine 之类的快照，用于一键回滚到以前的 repo 状态
在 Git 中本机不存在的功能，如可视化提交拆分器或统一的 reflog 浏览器
即时搜索整个存储库，包括差异内容，
一个快得离谱的 UI，通常比命令行更快。

下载后，打开界面有两种添加仓库的方式，一种是直接添加本地仓库，根据我的实践：

当本地仓库是从远端克隆下来的时候，此时对仓库进行操作后，可以正常推送到远端，如果是新建的空白仓库，则无法 push（不知道是不是我还没找到在哪里设置 upstream，不过我找了半天，大概率应该是没有）。
通过 ssh or https 直接添加远程仓库。这种方式是我现在正在用的，缺点是需要先在 github 上面新建一个空白仓库。

遇到的问题

添加远程仓库，修改完成提交时，又遇到了无法 push 的问题，好在 GitUp 的错误提示界面非常友好（我下了很多 git 软件，只有 GitUp 在不能 push 时告诉我，可能是因为没有添加 SSH 代理），谷歌了解决方式如下：

Set up SSH on macOS/Linux

Use this section to create a default identity and SSH key on macOS or Linux. By default, the system adds keys to the /Users//.ssh directory on macOS and /home//.ssh on Linux.

Step 1. Set up your default identity

From the terminal, enter ssh-keygen at the command line. The command prompts you for a file to save the key in:

$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/emmap1/.ssh/id_rsa):     

Press the Enter or Return key to accept the default location.

We recommend you keep the default key name unless you have a reason to change it.

To create a key with a name or path other than the default, specify the full path to the key. For example, to create a key called my-new-ssh-key, enter a path like the one shown at the prompt:
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$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/emmap1/.ssh/id_rsa): /Users/emmap1/.ssh/my-new-ssh-key      

Enter and re-enter a passphrase when prompted. The command creates your default identity with its public and private keys. The whole interaction will look similar to the following:

$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/emmap1/.ssh/id_rsa):
Created directory '/Users/emmap1/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/emmap1/.ssh/id_rsa.
Your public key has been saved in /Users/emmap1/.ssh/id_rsa.pub.
The key fingerprint is:
4c:80:61:2c:00:3f:9d:dc:08:41:2e:c0:cf:b9:17:69 emmap1@myhost.local 
The key's randomart image is:
+--[ RSA 2048]----+
|*o+ooo.     |
|.+.=o+ .     |
|. *.* o .    |
| . = E o     |
|  o . S    |
|  . .      |
|   .      |
|         |
|         |
+-----------------+     

List the contents of ~/.ssh to view the key files.

$ ls ~/.ssh 
id_rsa  id_rsa.pub 

The command displays two files, one for the public key (for example id_rsa.pub) and one for the private key (for example, id_rsa).

Step 2. Add the key to the ssh-agent

If you don’t want to type your password each time you use the key, you’ll need to add it to the ssh-agent.

To start the agent, run the following:
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$ eval `ssh-agent` Agent pid 9700
Enter ssh-add followed by the path to the private key file:

macOS $ ssh-add -K ~/.ssh/

Linux $ ssh-add ~/.ssh/
(macOS only) So that your computer remembers your password each time it restarts, open (or create) the ~/.ssh/config file and add these lines to the file:
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Host * UseKeychain yes

最后在相应平台（我是 GitHUb）的设置界面把刚才生成的 SSH 添加上就可以了，在这里可以使用

1	`pbcopy < ~/.ssh/id_rsa.pub`

指令快速将 SSH 复制到剪切板。

然后就可以愉快的玩耍啦~