通过货物安装周转箱时出错:指定的软件包没有二进制文件 [英] Error installing a crate via cargo: specified package has no binaries

问题描述

我正在尝试使用Cargo在我的系统(Arch Linux)上安装Rust板条箱.我可以搜索箱子并找到所需的东西，例如:

I'm trying to install a Rust crate on my system (Arch Linux) using Cargo. I can search for crates and find what I need, for example:

 $ cargo search curl | head -n3
    Updating registry `https://github.com/rust-lang/crates.io-index`
curl (0.3.0)             Rust bindings to libcurl for making HTTP requests
curl-sys (0.2.0)         Native bindings to the libcurl library

当我尝试安装它时，出现以下错误:

When I try to install it, I get the following error:

 $ cargo install curl
    Updating registry `https://github.com/rust-lang/crates.io-index`
error: specified package has no binaries

这是什么意思?我必须首先从源代码构建它吗?如果不首先安装Cargo，那有什么意义呢?

What does this mean? Do I have to build it from source first? What's the point of Cargo if it does not install it in the first place?

 $ uname -a
Linux 4.6.1-2-ARCH #1 SMP PREEMPT Thu Jun 2 15:46:17 CEST 2016 x86_64 GNU/Linux
 $ rustc --version
rustc 1.9.0
 $ cargo --version
cargo 0.10.0 (10ddd7d 2016-04-08)

推荐答案

cargo install用于安装恰好通过crates.io分发的二进制软件包.

cargo install is used to install binary packages that happen to be distributed through crates.io.

如果要使用板条箱作为依赖项，请将其添加到您的Cargo.toml.

If you want to use a crate as a dependency, add it to your Cargo.toml.

阅读 The Rust入门指南和《货物入门指南》 获取更多信息.简而言之:

Read the Rust getting started guide and the Cargo getting started guide for further information. In short:

cargo new my_project
cd my_project
echo 'curl = "0.3.0"' >> Cargo.toml

有趣的是，您可以使用cargo install，可以更轻松地修改您的Cargo.toml文件以添加依赖项！

Amusingly, you can install a third-party Cargo subcommand called cargo-edit using cargo install that makes it easier to modify your Cargo.toml file to add dependencies!

cargo install cargo-edit
cargo add curl

---

要注意的重要一点是，每个货物项目都管理和编译了一组独立的依赖项(某些背景信息).因此，安装已编译库没有任何意义.库的每个版本的源代码将被本地缓存，从而避免了多次下载.

---

An important thing to note is that every Cargo project manages and compiles a separate set of dependencies (some background info). Thus it doesn't make sense to install a compiled library. The source code for each version of a library will be cached locally, avoiding downloading it multiple times.

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