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<h1 id="通过-configtoml-对-cargo-进行配置"><a class="header" href="#通过-configtoml-对-cargo-进行配置">通过 config.toml 对 Cargo 进行配置</a></h1>
<p>Cargo 相关的配置有两种，第一种是对自身进行配置，第二种是对指定的项目进行配置，关于后者请查看 <a href="https://course.rs/cargo/reference/manifest.html">Cargo.toml 清单</a>。对于普通用户而言第二种才是我们最常使用的。</p>
<p>本文讲述的是如何对 Cargo 相关的工具进行配置，该配置中的部分内容可能会覆盖掉 <code>Cargo.toml</code> 中对应的部分，例如关于 <code>profile</code> 的内容。</p>
<h2 id="层级结构"><a class="header" href="#层级结构">层级结构</a></h2>
<p>在前面我们已经见识过如何为 Cargo 进行全局配置：<code>$HOME/.cargo/config.toml</code>，事实上，还支持在一个 <code>package</code> 内对它进行配置。</p>
<p>总体原则是：<code>Cargo</code> 会顺着当前目录往上查找，直到找到目标配置文件。例如我们在目录 <code>/projects/foo/bar/baz</code> 下调用 Cargo 命令，那查找路径如下所示：</p>
<ul>
<li><code>/projects/foo/bar/baz/.cargo/config.toml</code></li>
<li><code>/projects/foo/bar/.cargo/config.toml</code></li>
<li><code>/projects/foo/.cargo/config.toml</code></li>
<li><code>/projects/.cargo/config.toml</code></li>
<li><code>/.cargo/config.toml</code></li>
<li><code>$CARGO_HOME/config.toml</code> 默认是 :
<ul>
<li>Windows: <code>%USERPROFILE%\.cargo\config.toml</code></li>
<li>Unix: <code>$HOME/.cargo/config.toml</code></li>
</ul>
</li>
</ul>
<p>有了这种机制，我们既可以在全局中设置默认的配置，又可以每个包都设定独立的配置，甚至还能做版本控制。</p>
<p>如果一个 <code>key</code> 在多个配置中出现，那这些 <code>key</code> 只会保留一个：最靠近 Cargo 执行目录的配置文件中的 key 的值将被最终使用(因此， $HOME 下的都是最低优先级)。<strong>需要注意的是，如果 <code>key</code> 的值是数组，那相应的值将被合并( join )</strong>。</p>
<p>对于工作空间而言，<code>Cargo</code> 的搜索策略是从 root 开始，对于内部成员中包含的 <code>.cargo.toml</code> 会自动忽略。例如一个工作空间拥有两个成员，每个成员都有配置文件: <code>/projects/foo/bar/baz/mylib/.cargo/config.toml</code> 和 <code>/projects/foo/bar/baz/mybin/.cargo/config.toml</code>，但是 <code>Cargo</code> 并不会读取它们而是从工作空间的根( <code>/projects/foo/bar/baz/</code> )开始往上查找。</p>
<blockquote>
<p>注意：Cargo 还支持没有 <code>.toml</code> 后缀的 <code>.cargo/config</code> 文件。对于 <code>.toml</code> 的支持是从 Rust 1.39 版本开始，同时也是目前最推荐的方式。<strong>但若同时存在有后缀和无后缀的文件，Cargo 将使用无后缀的!</strong></p>
</blockquote>
<h2 id="配置文件概览"><a class="header" href="#配置文件概览">配置文件概览</a></h2>
<p>下面是一个完整的配置文件，并对<strong>常用的选项</strong>进行了翻译，大家可以参考下:</p>
<pre><code class="language-toml">paths = [&quot;/path/to/override&quot;] # 覆盖 `Cargo.toml` 中通过 path 引入的本地依赖
[alias] # 命令别名
b = &quot;build&quot;
c = &quot;check&quot;
t = &quot;test&quot;
r = &quot;run&quot;
rr = &quot;run --release&quot;
space_example = [&quot;run&quot;, &quot;--release&quot;, &quot;--&quot;, &quot;\&quot;command list\&quot;&quot;]
[build]
jobs = 1 # 并行构建任务的数量，默认等于 CPU 的核心数
rustc = &quot;rustc&quot; # rust 编译器
rustc-wrapper = &quot;…&quot; # 使用该 wrapper 来替代 rustc
rustc-workspace-wrapper = &quot;…&quot; # 为工作空间的成员使用 该 wrapper 来替代 rustc
rustdoc = &quot;rustdoc&quot; # 文档生成工具
target = &quot;triple&quot; # 为 target triple 构建 ( `cargo install` 会忽略该选项)
target-dir = &quot;target&quot; # 存放编译输出结果的目录
rustflags = [&quot;…&quot;, &quot;…&quot;] # 自定义flags，会传递给所有的编译器命令调用
rustdocflags = [&quot;…&quot;, &quot;…&quot;] # 自定义flags，传递给 rustdoc
incremental = true # 是否开启增量编译
dep-info-basedir = &quot;…&quot; # path for the base directory for targets in depfiles
pipelining = true # rustc pipelining
[doc]
browser = &quot;chromium&quot; # `cargo doc --open` 使用的浏览器,
# 可以通过 `BROWSER` 环境变量进行重写
[env]
# Set ENV_VAR_NAME=value for any process run by Cargo
ENV_VAR_NAME = &quot;value&quot;
# Set even if already present in environment
ENV_VAR_NAME_2 = { value = &quot;value&quot;, force = true }
# Value is relative to .cargo directory containing `config.toml`, make absolute
ENV_VAR_NAME_3 = { value = &quot;relative/path&quot;, relative = true }
[cargo-new]
vcs = &quot;none&quot; # 所使用的 VCS ('git', 'hg', 'pijul', 'fossil', 'none')
[http]
debug = false # HTTP debugging
proxy = &quot;host:port&quot; # HTTP 代理，libcurl 格式
ssl-version = &quot;tlsv1.3&quot; # TLS version to use
ssl-version.max = &quot;tlsv1.3&quot; # 最高支持的 TLS 版本
ssl-version.min = &quot;tlsv1.1&quot; # 最小支持的 TLS 版本
timeout = 30 # HTTP 请求的超时时间，秒
low-speed-limit = 10 # 网络超时阈值 (bytes/sec)
cainfo = &quot;cert.pem&quot; # path to Certificate Authority (CA) bundle
check-revoke = true # check for SSL certificate revocation
multiplexing = true # HTTP/2 multiplexing
user-agent = &quot;…&quot; # the user-agent header
[install]
root = &quot;/some/path&quot; # `cargo install` 安装到的目标目录
[net]
retry = 2 # 网络重试次数
git-fetch-with-cli = true # 是否使用 `git` 命令来执行 git 操作
offline = true # 不能访问网络
[patch.&lt;registry&gt;]
# Same keys as for [patch] in Cargo.toml
[profile.&lt;name&gt;] # profile 配置，详情见&quot;如何在 Cargo.toml 中配置 profile&quot; : https://course.rs/cargo/reference/profiles.html#profile设置
opt-level = 0
debug = true
split-debuginfo = '...'
debug-assertions = true
overflow-checks = true
lto = false
panic = 'unwind'
incremental = true
codegen-units = 16
rpath = false
[profile.&lt;name&gt;.build-override]
[profile.&lt;name&gt;.package.&lt;name&gt;]
[registries.&lt;name&gt;] # 设置其它的注册服务： https://course.rs/cargo/reference/specify-deps.html#从其它注册服务引入依赖包
index = &quot;…&quot; # 注册服务索引列表的 URL
token = &quot;…&quot; # 连接注册服务所需的鉴权 token
[registry]
default = &quot;…&quot; # 默认的注册服务名称: crates.io
token = &quot;…&quot;
[source.&lt;name&gt;] # 注册服务源和替换source definition and replacement
replace-with = &quot;…&quot; # 使用给定的 source 来替换当前的 source，例如使用科大源来替换crates.io源以提升国内的下载速度：[source.crates-io] replace-with = 'ustc'
directory = &quot;…&quot; # path to a directory source
registry = &quot;…&quot; # 注册源的 URL ，例如科大源: [source.ustc] registry = &quot;git://mirrors.ustc.edu.cn/crates.io-index&quot;
local-registry = &quot;…&quot; # path to a local registry source
git = &quot;…&quot; # URL of a git repository source
branch = &quot;…&quot; # branch name for the git repository
tag = &quot;…&quot; # tag name for the git repository
rev = &quot;…&quot; # revision for the git repository
[target.&lt;triple&gt;]
linker = &quot;…&quot; # linker to use
runner = &quot;…&quot; # wrapper to run executables
rustflags = [&quot;…&quot;, &quot;…&quot;] # custom flags for `rustc`
[target.&lt;cfg&gt;]
runner = &quot;…&quot; # wrapper to run executables
rustflags = [&quot;…&quot;, &quot;…&quot;] # custom flags for `rustc`
[target.&lt;triple&gt;.&lt;links&gt;] # `links` build script override
rustc-link-lib = [&quot;foo&quot;]
rustc-link-search = [&quot;/path/to/foo&quot;]
rustc-flags = [&quot;-L&quot;, &quot;/some/path&quot;]
rustc-cfg = ['key=&quot;value&quot;']
rustc-env = {key = &quot;value&quot;}
rustc-cdylib-link-arg = [&quot;…&quot;]
metadata_key1 = &quot;value&quot;
metadata_key2 = &quot;value&quot;
[term]
verbose = false # whether cargo provides verbose output
color = 'auto' # whether cargo colorizes output
progress.when = 'auto' # whether cargo shows progress bar
progress.width = 80 # width of progress bar
</code></pre>
<h2 id="环境变量"><a class="header" href="#环境变量">环境变量</a></h2>
<p>除了 <code>config.toml</code> 配置文件，我们还可以使用环境变量的方式对 Cargo 进行配置。</p>
<p>配置文件的中的 key <code>foo.bar</code> 对应的环境变量形式为 <code>CARGO_FOO_BAR</code>，其中的<code>.</code>、<code>-</code> 被转换成 <code>_</code>，且字母都变成大写的。例如，<code>target.x86_64-unknown-linux-gnu.runner</code> key 转换成环境变量后变成 <code>CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER</code>。</p>
<p>就优先级而言，环境变量是比配置文件更高的。除了上面的机制，Cargo 还支持一些<a href="https://doc.rust-lang.org/stable/cargo/reference/environment-variables.html">预定义的环境变量</a>。</p>
<blockquote>
<p>官方 Cargo Book 中本文的内容还有<a href="https://doc.rust-lang.org/stable/cargo/reference/config.html#configuration-keys">很多</a>，但是剩余内容对于绝大多数用户都用不到，因此我们并没有涵盖其中。</p>
</blockquote>
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