No such file or directory (os error 2) when doing cargo run

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1

I installed Rust on my M1 Mac mini.

I can't get it to build my rust project - it says "No such file or directory (os error 2)"

Notice below how the Cargo.toml file it says it cannot find is two directories up.

Can anyone suggest what might be wrong?

thanks!

username@M1-Mac-mini ffmq % cargo run
error: failed to read `/Users/username/devel/Cargo.toml`

Caused by:
  No such file or directory (os error 2)
username@M1-Mac-mini ffmq % pwd
/Users/username/devel/ffmq/ffmq
username@M1-Mac-mini ffmq % find .
.
./Cargo.toml
./LICENSE
./README.md
./.gitignore
./src
./src/main.rs
./src/main.rs.working
username@M1-Mac-mini ffmq %
2

What are the contents of the Cargo.toml file you do have? In particular, does it have a [workspace] section?

3

It does not have a workspace section. Does it need that? That same exact code compiles fine on Linux.

[package]
name = "foo"
version = "0.3.0"
authors = ["foo <foo@example.com>"]
edition = "2018"
license = "MIT"
description = "foo"
keywords = ["foo", "foo"]
repository = ""
readme = "README.md"

[dependencies]
....
4

No, I was just speculating about a possible cause for the problem.

5

Could you run this command, which enables extra logging, and show us the results?

CARGO_LOG=debug cargo run
6 
username@M1-Mac-mini mqstoreserver % CARGO_LOG=debug cargo run
[2021-10-29T23:16:40Z DEBUG cargo::core::workspace] find_root - trying /Users/username/devel/ffmq/Cargo.toml
[2021-10-29T23:16:40Z DEBUG cargo::core::workspace] find_root - found pointer
[2021-10-29T23:16:40Z DEBUG cargo::core::workspace] find_root - pointer /Users/username/devel/ffmq/../Cargo.toml
[2021-10-29T23:16:40Z DEBUG cargo] exit_with_error; err=CliError { error: Some(failed to read `/Users/username/devel/Cargo.toml`

    Caused by:
        No such file or directory (os error 2)), exit_code: 101 }
[2021-10-29T23:16:40Z DEBUG cargo] display_error; err=failed to read `/Users/username/devel/Cargo.toml`

    Caused by:
        No such file or directory (os error 2)
error: failed to read `/Users/username/devel/Cargo.toml`

Caused by:
  No such file or directory (os error 2)
username@M1-Mac-mini mqstoreserver %
7

I believe the problem is that the parent directory has a Cargo.toml with an invalid workspace field, something like this:

/Users/username/devel/ffmq/Cargo.toml

[package]
name = "foo"
workspace = ".."

This makes Cargo look for a workspace in /Users/username/devel/Cargo.toml, which does not exist. To fix this, change or remove the workspace value in /Users/username/devel/ffmq/Cargo.toml.

2 Likes
8

You sir, were perfectly correct.

9

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