如何指定默认情况下在 Cargo 工作区的根目录中运行的 crate `cargo run`?

问题描述

现在我有一个包含三个成员的 Cargo 工作区.

Right now I have a Cargo workspace with three members.

[workspace]
members = [
    "foo",
    "bar",
    "baz",
]

如果我在根目录中运行 cargo run，我会收到这个错误:

If I run cargo run in the root directory, I get this error:

错误:清单路径 /home/lukas/dev/mahboi/Cargo.toml 是一个虚拟清单，但此命令需要针对此工作区中的实际包运行

这是有道理的.我可以运行 cargo run -p foo 并且它可以工作.但问题是:foo 是唯一可执行的 crate，我会经常执行它，所以如果我能运行 cargo run 并执行它会很好.

That makes sense. I can run cargo run -p foo and it works. But the thing is: foo is the only crate that is executable and I will execute it very often, so it would be nice if I could just run cargo run and execute it.

我尝试使用 default-members 键，但这没有帮助:

I tried to use the default-members key, but this didn't help:

default-members = ["foo"]

是否有另一种方法告诉 Cargo cargo run 应该执行 foo crate(相当于在 中运行 cargo runfoo/ 子目录)?我也会接受使 root crate 非虚拟的答案(即添加一个 [package] 键).

---

Is there another way to tell Cargo that cargo run should execute the foo crate (equivalent to running cargo run in the foo/ subdirectory)? I would also accept answers that make the root crate non virtual (i.e. add a [package] key).

推荐答案

Single Binary

这个 从 Rust 1.30 开始可用.这是我测试过的完整文件集:

Single Binary

This is available as of Rust 1.30. Here is the complete set of files I tested with:

Cargo.toml

[workspace]
members = [
    "foo",
    "bar",
    "baz",
]

foo/Cargo.toml

[package]
name = "foo"
version = "0.1.0"
authors = ["An Devloper <[email protected]>"]

[dependencies]

foo/src/main.rs

fn main() {
    println!("Hello, world!");
}

bar/Cargo.toml

[package]
name = "bar"
version = "0.1.0"
authors = ["An Devloper <[email protected]>"]

[dependencies]

bar/src/lib.rs

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}

baz/Cargo.toml

[package]
name = "baz"
version = "0.1.0"
authors = ["An Devloper <[email protected]>"]

[dependencies]

baz/src/lib.rs

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}

$ tree .
.
├── Cargo.lock
├── Cargo.toml
├── bar
│   ├── Cargo.toml
│   └── src
│       └── lib.rs
├── baz
│   ├── Cargo.toml
│   └── src
│       └── lib.rs
├── foo
│   ├── Cargo.toml
│   └── src
│       └── main.rs
├── src
│   └── lib.rs
└── target
    └── ...

$ cargo run
   Compiling baz v0.1.0 (file:///private/tmp/example/baz)
   Compiling bar v0.1.0 (file:///private/tmp/example/bar)
   Compiling foo v0.1.0 (file:///private/tmp/example/foo)
    Finished dev [unoptimized + debuginfo] target(s) in 0.39s
     Running `target/debug/foo`
Hello, world!

多个二进制文件

从 Rust 1.37.0 开始，您可以使用 Cargo 的默认运行"功能来指定使用哪个.

Multiple Binaries

As of Rust 1.37.0 you can use Cargo's "default-run" feature to specify which one to use.

foo/Cargo.toml

[package]
name = "foo"
version = "0.0.1"
authors = ["An Devloper <[email protected]>"]
default-run = "foo"

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