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<h1 class="post-title"><a href="https://blog.dich.bid/about-git/">乱七八糟:Git使用简明手册</a></h1>
<div class="post-meta-inline">
<span class="post-date">
2023-12-15
</span>
</div>
<span class="post-tags-inline">
:: tags:&nbsp;
<a class="post-tag" href="https://blog.dich.bid/tags/luan-qi-ba-zao/">#乱七八糟</a></span>
<div class="post-content">
<p>前言 Git作为现代软件开发中不可或缺的版本控制工具常常让初学者感到困惑。本文旨在介绍 Git 的全流程安装和基本使用,希望能够帮助新手更轻松地理解和掌握 Git 的基本概念和操作。</p>
<span id="continue-reading"></span>
<p>我们以Github为例子过一遍Git的安装/配置/连接和第一次提交.</p>
<h2 id="1-an-zhuang-git">1.安装Git</h2>
<ul>
<li>
<p>Windows官网下载<a href="https://git-scm.com/download/">Git-download</a>或者使用Scoop/WinGet等等.</p>
</li>
<li>
<p>LinuxUbuntu:<code>sudo apt install git</code> / Arch:<code>sudo pacman -S git</code></p>
</li>
</ul>
<p>安装完成后可以在终端中检测版本:</p>
<pre style="background-color:#151515;color:#e8e8d3;"><code><span> git -v
</span><span>git version 2.51.2
</span></code></pre>
<h2 id="2-chuang-jian-mi-yao">2.创建密钥</h2>
<p>在推送代码到Github的时候我们需要进行认证有密码认证和密钥认证两种方法现在推荐使用密钥认证。</p>
<ul>
<li>首先生成一对公私钥,这里的邮箱可以随意填写:</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">ssh-keygen -t</span><span> rsa</span><span style="color:#ffb964;"> -b</span><span> 4096</span><span style="color:#ffb964;"> -C </span><span style="color:#556633;">&quot;</span><span style="color:#99ad6a;">your_email@example.com</span><span style="color:#556633;">&quot;
</span></code></pre>
<p>你会看到如下所示的提示,像我一样填写路径的时候就可以顺便给它改个名字否则会使用默认名id_rsa:</p>
<pre style="background-color:#151515;color:#e8e8d3;"><code><span> ssh-keygen -t rsa -b 4096 -C &quot;your_email@example.com&quot;
</span><span>Generating public/private rsa key pair.
</span><span>Enter file in which to save the key (/home/dich/.ssh/id_rsa): /home/dich/.ssh/Github
</span></code></pre>
<p>随后一直按回车即可.</p>
<ul>
<li>生成的这对公私钥位于<code>~/.ssh/config</code>路径下在Windows中就是<code>C盘/User/你的用户名</code>下,带.pub后缀的文件为公钥不带.pub后缀的为私钥,打开公钥复制全部内容然后将公钥添加到Github的<code>Settings-SSH and GPG keys</code>中。</li>
</ul>
<blockquote>
<p>当你添加完毕后就无法在Github的设置中再次查看它了确保了安全性.</p>
</blockquote>
<ul>
<li>随后编辑 <code>~/.ssh/config</code> 文件这个文件的作用是让Git知道主机对应的密钥例如</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#888888;"># GitHub
</span><span>
</span><span style="color:#ffb964;">Host</span><span> github
</span><span> </span><span style="color:#ffb964;">HostName</span><span> github.com
</span><span> </span><span style="color:#ffb964;">User</span><span> git
</span><span> </span><span style="color:#ffb964;">IdentityFile ~</span><span>/.ssh/Github
</span><span>
</span><span style="color:#888888;"># Gitee
</span><span>
</span><span style="color:#ffb964;">Host</span><span> gitee
</span><span> </span><span style="color:#ffb964;">HostName</span><span> gitee.com
</span><span> </span><span style="color:#ffb964;">User</span><span> git
</span><span> </span><span style="color:#ffb964;">IdentityFile ~</span><span>/.ssh/Gitee
</span></code></pre>
<blockquote>
<p>这边的IdentityFile是你的私钥位置即为不带pub后缀的文件。如果你不想将私钥放在~/.ssh/下,可以查看我的另一篇<a href="https://blog.dich.bid/network-ssh/">博客</a></p>
</blockquote>
<ul>
<li>设置好上面这些后就可以测试连接到Github,如果成功则显示successfully.</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;"></span><span> ssh</span><span style="color:#ffb964;"> -T</span><span> git@github.com
</span><span>
</span><span style="color:#ffb964;">Hi</span><span> Dichgrem! You</span><span style="color:#556633;">&#39;</span><span style="color:#99ad6a;">ve successfully authenticated, but GitHub does not provide shell access.
</span></code></pre>
<h2 id="3-pei-zhi-git">3.配置Git</h2>
<p>在正式连接到仓库前我们还需要让Git知道我们的用户名和邮箱地址。</p>
<ul>
<li>显示当前的Git配置</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --list
</span></code></pre>
<ul>
<li>设置提交代码时的用户信息,这里的name推荐和你的GitHub用户名一致邮箱可以不为真实邮箱比如<code>no-reply@github.com</code></li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> config </span><span style="color:#8fbfdc;">[</span><span>--global</span><span style="color:#8fbfdc;">]</span><span> user.name </span><span style="color:#556633;">&quot;</span><span style="color:#99ad6a;">[name]</span><span style="color:#556633;">&quot;
</span><span style="color:#ffb964;">git</span><span> config </span><span style="color:#8fbfdc;">[</span><span>--global</span><span style="color:#8fbfdc;">]</span><span> user.email </span><span style="color:#556633;">&quot;</span><span style="color:#99ad6a;">[email address]</span><span style="color:#556633;">&quot;
</span></code></pre>
<blockquote>
<p>注意如果你填写了你的真实邮箱同时这个仓库又是Public的那么其他人可以看到你的邮箱</p>
</blockquote>
<ul>
<li>配置默认主分支为Main</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> init.defaultBranch main
</span></code></pre>
<p>这里的设置是因为Git目前默认的主分支名为 master ,而 Github 默认分支名为 main ,这样可以保持一致。</p>
<h2 id="4-chuang-jian-cang-ku">4.创建仓库</h2>
<p>配置完Git之后我们就可以连接到远程的仓库了。首先创建一个Git仓库一般有两种方法</p>
<ul>
<li>方法一(推荐)在远程创建后下载到本地</li>
</ul>
<p>我们在Github中的<code>repositories</code>下New一个仓库然后在绿色的Code按钮中复制链接克隆远端服务器上的仓库</p>
<pre style="background-color:#151515;color:#e8e8d3;"><code><span>git clone git@github.com:Dichgrem/script.git
</span></code></pre>
<blockquote>
<p>如果你前面没有配置密钥就会发现无法使用这个命令克隆仓库。那么什么时候使用HTTPS的克隆呢比如其他人的仓库你没有权限又不想fork一份的情况下就可以使用HTTPS.</p>
</blockquote>
<ul>
<li>方法二:在本地初始化之后连接到远程</li>
</ul>
<p>创建一个新文件夹,然后在那个文件夹下运行以下命令:</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> init</span><span style="color:#ffb964;"> --initial-branch</span><span>=main
</span></code></pre>
<ul>
<li>在Github上创建一个同名仓库随后添加远程链接</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> remote add origin &lt;remote_repository_url&gt;
</span></code></pre>
<blockquote>
<p>如果你运行<code>git remote -v</code>发现URL为HTTP格式则可以用下面的命令改为Git格式</p>
</blockquote>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#888888;"># 例如git remote set-url origin git@github.com:Dichgrem/dichos.git
</span></code></pre>
<h2 id="4-tui-song-dai-ma">4.推送代码</h2>
<ul>
<li>添加</li>
</ul>
<p>在Git仓库中新建或修改文件后使用如下命令把它们添加到暂存区</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> add *
</span></code></pre>
<ul>
<li>提交</li>
</ul>
<p>随后使用如下命令提交改动:</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> commit</span><span style="color:#ffb964;"> -m </span><span style="color:#556633;">&quot;</span><span style="color:#99ad6a;">代码提交信息</span><span style="color:#556633;">&quot;
</span><span style="color:#888888;"># 例如git commit -m &quot;update:mycode&quot;
</span></code></pre>
<p>现在,你的改动已经提交到了 <strong>HEAD</strong>,但是还没到你的远端仓库。</p>
<ul>
<li>推送改动</li>
</ul>
<p>执行如下命令以将这些改动提交到远端仓库,随后即可在GitHub上查看</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> push origin main
</span></code></pre>
<blockquote>
<p>想学习更多Git操作可以使用这个<a href="https://learngitbranching.js.org/?locale=zh_CN">Git练习网站</a></p>
</blockquote>
<h2 id="5-commitgui-fan">5.Commit规范</h2>
<ul>
<li>提交信息的基本格式,例如</li>
</ul>
<pre style="background-color:#151515;color:#e8e8d3;"><code><span>feat:add_highlight
</span></code></pre>
<ul>
<li>常见的 Commit 类型</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">-</span><span> feat新功能的添加
</span><span>
</span><span style="color:#ffb964;">-</span><span> fix修复 Bug
</span><span>
</span><span style="color:#ffb964;">-</span><span> docs文档相关的修改
</span><span>
</span><span style="color:#ffb964;">-</span><span> style代码格式、排版等不影响代码逻辑的调整
</span><span>
</span><span style="color:#ffb964;">-</span><span> refactor代码重构不涉及新功能或 Bug 修复
</span><span>
</span><span style="color:#ffb964;">-</span><span> perf性能优化
</span><span>
</span><span style="color:#ffb964;">-</span><span> test添加或修改测试代码
</span><span>
</span><span style="color:#ffb964;">-</span><span> build构建相关的变更如依赖管理、构建脚本等
</span><span>
</span><span style="color:#ffb964;">-</span><span> ci持续集成相关的修改
</span><span>
</span><span style="color:#ffb964;">-</span><span> chore其他杂项维护不涉及源代码或测试文件的修改
</span><span>
</span><span style="color:#ffb964;">-</span><span> revert回滚到上一个版本的提交
</span></code></pre>
<h2 id="6-gityuan-li">6.Git原理</h2>
<ul>
<li>三棵树</li>
</ul>
<p>一个Git仓库的目录里面包括<code>工作目录</code>(即我们要追踪的代码)以及<code>.git</code>目录Git 在这里存储自己的数据。Git 维护了三棵“树”:第一个是你的 <code>工作目录</code>,它持有实际文件;第二个是 <code>暂存区Index</code>,它像个缓存区域,临时保存你的改动;最后是 <code>HEAD</code>,它指向你最后一次提交的结果。</p>
<p><img src="http://marklodato.github.io/visual-git-guide/basic-usage.svg.png" alt="git-tree" /></p>
<ul>
<li><code>.git</code> 目录结构</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">.git/
</span><span style="color:#ffb964;">├──</span><span> HEAD
</span><span style="color:#ffb964;">├──</span><span> config
</span><span style="color:#ffb964;">├──</span><span> description
</span><span style="color:#ffb964;">├──</span><span> hooks/
</span><span style="color:#ffb964;">├──</span><span> index
</span><span style="color:#ffb964;">├──</span><span> info/
</span><span style="color:#ffb964;"></span><span> └── exclude
</span><span style="color:#ffb964;">├──</span><span> logs/
</span><span style="color:#ffb964;"></span><span> ├── HEAD
</span><span style="color:#ffb964;"></span><span> └── refs/
</span><span style="color:#ffb964;">├──</span><span> objects/
</span><span style="color:#ffb964;"></span><span> ├── info/
</span><span style="color:#ffb964;"></span><span> └── pack/
</span><span style="color:#ffb964;">├──</span><span> refs/
</span><span style="color:#ffb964;"></span><span> ├── heads/
</span><span style="color:#ffb964;"></span><span> ├── remotes/
</span><span style="color:#ffb964;"></span><span> └── tags/
</span></code></pre>
<ul>
<li>objects存储 Git 的所有对象,包括:
<ul>
<li>blob文件内容</li>
<li>tree目录结构</li>
<li>commit提交对象记录提交信息和指向的树对象</li>
<li>tag标签对象
这些对象以 SHA-1 哈希命名,前两位作为子目录,其余作为文件名</li>
</ul>
</li>
<li>refs存储所有引用包括
<ul>
<li>heads本地分支</li>
<li>remotes远程分支</li>
<li>tags标签</li>
</ul>
</li>
<li>HEAD指向当前检出的分支或提交。例如<code>ref: refs/heads/main</code> 表示当前位于 <code>main</code> 分支</li>
<li>config仓库级别的配置文件包含用户名、邮箱、远程仓库等信息</li>
<li>description用于描述仓库仅供 GitWeb 等工具使用</li>
<li>hooks存放 Git 钩子脚本的目录,可用于在特定操作前后执行自定义脚本,如 <code>pre-commit</code><code>post-merge</code></li>
<li>index暂存区staging area的索引文件记录了即将提交的文件信息</li>
<li>info包含辅助信息<code>exclude</code> 文件用于定义仓库级别的忽略规则</li>
<li>logs记录了引用如分支、标签的更新历史有助于追踪操作记录</li>
</ul>
<hr />
<h2 id="7-tips">7.Tips</h2>
<h3 id="verified">Verified</h3>
<p>在 GitHub 的 commit 历史中看到的 “Verified” 标记,表示该提交是经过 签名验证signed commit 的,也就是 GitHub 能确认这个 commit 的确是由声明的提交者签名并发布的。可以通过GPG或者SSH配置</p>
<ul>
<li>GPG方式</li>
</ul>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">sudo</span><span> pacman</span><span style="color:#ffb964;"> -S</span><span> gnupg //安装 GPG
</span><span style="color:#ffb964;">gpg --full-generate-key</span><span> //生成 GPG 密钥
</span><span style="color:#ffb964;">gpg --list-secret-keys --keyid-format</span><span>=long //查看你生成的密钥 ID
</span><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> user.signingkey ABCDEF1234567890 //让 Git 使用该密钥签名
</span><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> commit.gpgsign true //启用自动签名所有提交
</span><span style="color:#ffb964;">gpg --armor --export</span><span> ABCDEF1234567890 //导出公钥并添加到 GitHub
</span></code></pre>
<p>然后前往<code>GitHub → Settings → SSH and GPG keys → New GPG key</code>粘贴并保存。</p>
<ul>
<li>SSH方式</li>
</ul>
<p>可以用你平时登录 GitHub 的同一个 SSH 密钥:</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> gpg.format ssh //让 Git 使用 SSH 格式签名
</span><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> user.signingkey </span><span style="color:#ffb964;">~</span><span>/.ssh/Github.pub //指定使用的 SSH 公钥
</span><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> commit.gpgsign true //表示自动签名所有提交
</span></code></pre>
<p>然后前往<code>Settings → SSH and GPG keys → New SSH key → Signing key</code>粘贴并保存。</p>
<ul>
<li>本地查看</li>
</ul>
<p>首先创建这个文件:</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">mkdir -p ~</span><span>/.ssh
</span><span style="color:#ffb964;">nano ~</span><span>/.ssh/allowed_signers
</span></code></pre>
<p>写入你的 <code>test@mail.com ssh-ed25519 AAAABBBBBBBBBBBBBBBBxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx</code>并保存。
随后配置Git信任该文件</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> config</span><span style="color:#ffb964;"> --global</span><span> gpg.ssh.allowedSignersFile </span><span style="color:#ffb964;">~</span><span>/.ssh/allowed_signers
</span></code></pre>
<p>随后使用<code>git log --show-signature</code>即可查看本地log中的</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">Good </span><span style="color:#556633;">&quot;</span><span style="color:#99ad6a;">git</span><span style="color:#556633;">&quot;</span><span> signature for test@mail.com with ED25519 key SHA256:ssh-ed25519 AAAABBBBBBBBBBBBBBBBBBBBB
</span></code></pre>
<h3 id="sheng-cheng-bu-ding">生成补丁</h3>
<p>比如你修改了项目中的<code>fs/proc/base.c</code>,然后</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> add fs/proc/base.c
</span><span style="color:#ffb964;">git</span><span> commit</span><span style="color:#ffb964;"> -m </span><span style="color:#556633;">&quot;</span><span style="color:#99ad6a;">fix:base</span><span style="color:#556633;">&quot;
</span><span style="color:#ffb964;">git</span><span> format-patch origin/16.0
</span></code></pre>
<p>即可在目录下生成补丁<code>0001-fix-base.patch</code>.</p>
<h3 id="shan-chu-qian-yi-ge-ti-jiao-ji-lu">删除前一个提交记录</h3>
<p>有时候手滑或者不想使用一个commit说明可以用以下命令撤销上一个 commit</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> reset</span><span style="color:#ffb964;"> --soft</span><span> HEAD</span><span style="color:#ffb964;">~</span><span>1
</span></code></pre>
<p>这个命令会撤销上一个 commit但保留文件修改代码仍然在工作区。适用于 想要重新提交amend或调整 commit 的情况。</p>
<p>如果你想彻底删除更改(不保留代码修改),可以使用:</p>
<pre data-lang="bash" style="background-color:#151515;color:#e8e8d3;" class="language-bash "><code class="language-bash" data-lang="bash"><span style="color:#ffb964;">git</span><span> reset</span><span style="color:#ffb964;"> --hard</span><span> HEAD</span><span style="color:#ffb964;">~</span><span>1
</span></code></pre>
<hr />
<p><strong>Done.</strong></p>
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