Toolchain file not properly resolving Rust 1.79

[Rigidity]

Verification

• I searched for recent similar issues at https://github.com/rust-lang/rustup/issues?q=is%3Aissue+is%3Aopen%2Cclosed and found no duplicates.
• I am on the latest version of Rustup according to https://github.com/rust-lang/rustup/tags and am still able to reproduce my issue.

Problem

I have the following rust-toolchain.toml file in my project:

[toolchain]
channel = "1.79"
components = ["rustfmt", "clippy"]

And when I run any cargo command, it fails with:

error: the 'cargo' binary, normally provided by the 'cargo' component, is not applicable to the '1.79-aarch64-apple-darwin' toolchain

Changing the rust-toolchain.toml to either of these resolves the issue (though is not what I want):

[toolchain]
channel = "1.78"
components = ["rustfmt", "clippy"]

[toolchain]
channel = "stable"
components = ["rustfmt", "clippy"]

Steps

1. Create a new Rust project with cargo init
2. Create a rust-toolchain.toml file and add channel = "1.79" to the [toolchain] section
3. Run a cargo command (even with 1.79 installed, this fails)

Possible Solution(s)

No response

Notes

I have attempted to do all of the following before filing this bug:

• Update Rustup
• Reinstall Rustup
• Update my toolchain
• Reinstall both stable and 1.79
• Reinstall the cargo and clippy components manually
• Delete the ~/.rustup directory
• Delete the ~/.cargo directory
• Ensured that the toolchain does in fact contain the required components
• Ensured that the installed version of Cargo is in fact 1.79

Rustup version

rustup 1.27.1 (54dd3d00f 2024-04-24)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.79.0 (129f3b996 2024-06-10)`

Installed toolchains

Default host: aarch64-apple-darwin
rustup home:  /Users/rigidity/.rustup

installed toolchains
--------------------

stable-aarch64-apple-darwin
1.79.0-aarch64-apple-darwin (default)
1.78-aarch64-apple-darwin
1.79-aarch64-apple-darwin

active toolchain
----------------

stable-aarch64-apple-darwin (overridden by '/Users/rigidity/Desktop/chia-rs/rust-toolchain.toml')
rustc 1.79.0 (129f3b996 2024-06-10)

OS version

MacOS 14.5

[Rigidity]

I've cloned Rustup and added some debug logging and discovered that apparently I have two toolchain folders:

• 1.79.0-aarch64-apple-darwin
• 1.79-aarch64-apple-darwin

The former has cargo and the latter doesn't. But both have some somponents.

When I use 1.78, it resolves to the 1.78-aarch64-apple-darwin folder, but there is no duplication with this version, so it finds cargo fine.

[Rigidity]

So changing it to channel = "1.79.0" works, but channel = "1.79" finds the wrong directory.

[Rigidity]

This is reproducible by running rustup toolchain install 1.79 instead of rustup toolchain install 1.79.0
To me at least, these should resolve to the same thing until 1.79.1 is released? Not sure what the best path forward is here.

[rami3l]

Duplicate of #3104.