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<ol class="chapter"><li class="affix"><a href="index.html">Introduction</a></li><li><a href="getting-started/index.html"><strong aria-hidden="true">1.</strong> Getting Started</a></li><li><ol class="section"><li><a href="getting-started/installation.html"><strong aria-hidden="true">1.1.</strong> Installation</a></li><li><a href="getting-started/first-steps.html"><strong aria-hidden="true">1.2.</strong> First Steps with Cargo</a></li></ol></li><li><a href="guide/index.html"><strong aria-hidden="true">2.</strong> Cargo Guide</a></li><li><ol class="section"><li><a href="guide/why-cargo-exists.html"><strong aria-hidden="true">2.1.</strong> Why Cargo Exists</a></li><li><a href="guide/creating-a-new-project.html"><strong aria-hidden="true">2.2.</strong> Creating a New Project</a></li><li><a href="guide/working-on-an-existing-project.html"><strong aria-hidden="true">2.3.</strong> Working on an Existing Project</a></li><li><a href="guide/dependencies.html"><strong aria-hidden="true">2.4.</strong> Dependencies</a></li><li><a href="guide/project-layout.html"><strong aria-hidden="true">2.5.</strong> Project Layout</a></li><li><a href="guide/cargo-toml-vs-cargo-lock.html"><strong aria-hidden="true">2.6.</strong> Cargo.toml vs Cargo.lock</a></li><li><a href="guide/tests.html"><strong aria-hidden="true">2.7.</strong> Tests</a></li><li><a href="guide/continuous-integration.html"><strong aria-hidden="true">2.8.</strong> Continuous Integration</a></li><li><a href="guide/build-cache.html"><strong aria-hidden="true">2.9.</strong> Build Cache</a></li></ol></li><li><a href="reference/index.html"><strong aria-hidden="true">3.</strong> Cargo Reference</a></li><li><ol class="section"><li><a href="reference/specifying-dependencies.html"><strong aria-hidden="true">3.1.</strong> Specifying Dependencies</a></li><li><a href="reference/manifest.html"><strong aria-hidden="true">3.2.</strong> The Manifest Format</a></li><li><a href="reference/config.html" class="active"><strong aria-hidden="true">3.3.</strong> Configuration</a></li><li><a href="reference/environment-variables.html"><strong aria-hidden="true">3.4.</strong> Environment Variables</a></li><li><a href="reference/build-scripts.html"><strong aria-hidden="true">3.5.</strong> Build Scripts</a></li><li><a href="reference/publishing.html"><strong aria-hidden="true">3.6.</strong> Publishing on crates.io</a></li><li><a href="reference/pkgid-spec.html"><strong aria-hidden="true">3.7.</strong> Package ID Specifications</a></li><li><a href="reference/source-replacement.html"><strong aria-hidden="true">3.8.</strong> Source Replacement</a></li><li><a href="reference/external-tools.html"><strong aria-hidden="true">3.9.</strong> External Tools</a></li><li><a href="reference/unstable.html"><strong aria-hidden="true">3.10.</strong> Unstable Features</a></li></ol></li><li><a href="faq.html"><strong aria-hidden="true">4.</strong> FAQ</a></li></ol>
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<a class="header" href="reference/config.html#configuration" id="configuration"><h2>Configuration</h2></a>
<p>This document will explain how Cargo’s configuration system works, as well as
available keys or configuration. For configuration of a project through its
manifest, see the <a href="reference/manifest.html">manifest format</a>.</p>
<a class="header" href="reference/config.html#hierarchical-structure" id="hierarchical-structure"><h3>Hierarchical structure</h3></a>
<p>Cargo allows local configuration for a particular project as well as global
configuration, like git. Cargo extends this to a hierarchical strategy.
If, for example, Cargo were invoked in <code>/projects/foo/bar/baz</code>, then the
following configuration files would be probed for and unified in this order:</p>
<ul>
<li><code>/projects/foo/bar/baz/.cargo/config</code></li>
<li><code>/projects/foo/bar/.cargo/config</code></li>
<li><code>/projects/foo/.cargo/config</code></li>
<li><code>/projects/.cargo/config</code></li>
<li><code>/.cargo/config</code></li>
<li><code>$HOME/.cargo/config</code></li>
</ul>
<p>With this structure, you can specify configuration per-project, and even
possibly check it into version control. You can also specify personal defaults
with a configuration file in your home directory.</p>
<a class="header" href="reference/config.html#configuration-format" id="configuration-format"><h3>Configuration format</h3></a>
<p>All configuration is currently in the <a href="https://github.com/toml-lang/toml">TOML format</a> (like the manifest),
with simple key-value pairs inside of sections (tables) which all get merged
together.</p>
<a class="header" href="reference/config.html#configuration-keys" id="configuration-keys"><h3>Configuration keys</h3></a>
<p>All of the following keys are optional, and their defaults are listed as their
value unless otherwise noted.</p>
<p>Key values that specify a tool may be given as an absolute path, a relative path
or as a pathless tool name. Absolute paths and pathless tool names are used as
given. Relative paths are resolved relative to the parent directory of the
<code>.cargo</code> directory of the config file that the value resides within.</p>
<pre><code class="language-toml"># An array of paths to local repositories which are to be used as overrides for
# dependencies. For more information see the Specifying Dependencies guide.
paths = ["/path/to/override"]
[cargo-new]
# This is your name/email to place in the `authors` section of a new Cargo.toml
# that is generated. If not present, then `git` will be probed, and if that is
# not present then `$USER` and `$EMAIL` will be used.
name = "..."
email = "..."
# By default `cargo new` will initialize a new Git repository. This key can be
# set to `hg` to create a Mercurial repository, or `none` to disable this
# behavior.
vcs = "none"
# For the following sections, $triple refers to any valid target triple, not the
# literal string "$triple", and it will apply whenever that target triple is
# being compiled to. 'cfg(...)' refers to the Rust-like `#[cfg]` syntax for
# conditional compilation.
[target.$triple]
# This is the linker which is passed to rustc (via `-C linker=`) when the `$triple`
# is being compiled for. By default this flag is not passed to the compiler.
linker = ".."
# Same but for the library archiver which is passed to rustc via `-C ar=`.
ar = ".."
# If a runner is provided, compiled targets for the `$triple` will be executed
# by invoking the specified runner executable with actual target as first argument.
# This applies to `cargo run`, `cargo test` and `cargo bench` commands.
# By default compiled targets are executed directly.
runner = ".."
# custom flags to pass to all compiler invocations that target $triple
# this value overrides build.rustflags when both are present
rustflags = ["..", ".."]
[target.'cfg(...)']
# Similar for the $triple configuration, but using the `cfg` syntax.
# If several `cfg` and $triple targets are candidates, then the rustflags
# are concatenated. The `cfg` syntax only applies to rustflags, and not to
# linker.
rustflags = ["..", ".."]
# Configuration keys related to the registry
[registry]
index = "..." # URL of the registry index (defaults to the central repository)
token = "..." # Access token (found on the central repo’s website)
[http]
proxy = "host:port" # HTTP proxy to use for HTTP requests (defaults to none)
# in libcurl format, e.g. "socks5h://host:port"
timeout = 60000 # Timeout for each HTTP request, in milliseconds
cainfo = "cert.pem" # Path to Certificate Authority (CA) bundle (optional)
check-revoke = true # Indicates whether SSL certs are checked for revocation
[build]
jobs = 1 # number of parallel jobs, defaults to # of CPUs
rustc = "rustc" # the rust compiler tool
rustdoc = "rustdoc" # the doc generator tool
target = "triple" # build for the target triple
target-dir = "target" # path of where to place all generated artifacts
rustflags = ["..", ".."] # custom flags to pass to all compiler invocations
incremental = true # whether or not to enable incremental compilation
dep-info-basedir = ".." # full path for the base directory for targets in depfiles
[term]
verbose = false # whether cargo provides verbose output
color = 'auto' # whether cargo colorizes output
# Network configuration
[net]
retry = 2 # number of times a network call will automatically retried
# Alias cargo commands. The first 3 aliases are built in. If your
# command requires grouped whitespace use the list format.
[alias]
b = "build"
t = "test"
r = "run"
rr = "run --release"
space_example = ["run", "--release", "--", "\"command list\""]
</code></pre>
<a class="header" href="reference/config.html#environment-variables" id="environment-variables"><h3>Environment variables</h3></a>
<p>Cargo can also be configured through environment variables in addition to the
TOML syntax above. For each configuration key above of the form <code>foo.bar</code> the
environment variable <code>CARGO_FOO_BAR</code> can also be used to define the value. For
example the <code>build.jobs</code> key can also be defined by <code>CARGO_BUILD_JOBS</code>.</p>
<p>Environment variables will take precedent over TOML configuration, and currently
only integer, boolean, and string keys are supported to be defined by
environment variables. This means that <a href="reference/source-replacement.html">source replacement</a>, which is expressed by
tables, cannot be configured through environment variables.</p>
<p>In addition to the system above, Cargo recognizes a few other specific
<a href="reference/environment-variables.html">environment variables</a>.</p>
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