rust: Fails since Rust 1.87.0 (2025-05-15)

[liskin]

Rust 1.87.0 has finally removed the long deprecated RLS (see also Previous Components), but the rust feature unfortunately installs that component unconditionally:

features/src/rust/install.sh

Line 206 in 4f8a62a

rustup component add rls rust-analysis rust-src rustfmt clippy 2>&1

This results in a build error:

#17 21.24 Installing common Rust dependencies...
#17 21.39 error: toolchain 'stable-x86_64-unknown-linux-gnu' does not contain component 'rls' for target 'x86_64-unknown-linux-gnu'; did you mean 'rustc'?
#17 21.40 ERROR: Feature "Rust" (ghcr.io/devcontainers/features/rust) failed to install! Look at the documentation at ********/devcontainers/features/tree/main/src/rust for help troubleshooting this error.
#17 ERROR: process "/bin/sh -c cp -ar /tmp/build-features-src/rust_2 /tmp/dev-container-features  && chmod -R 0755 /tmp/dev-container-features/rust_2  && cd /tmp/dev-container-features/rust_2  && chmod +x ./devcontainer-features-install.sh  && ./devcontainer-features-install.sh  && rm -rf /tmp/dev-container-features/rust_2" did not complete successfully: exit code: 1

and "This codespace is currently running in recovery mode due to a container error."

Can we please drop rls and rust-analysis from the rustup component add invocation?

[NeoScript]

I can second this. I was about to post an issue myself when I first saw this

This is my error log when trying to add the devcontainer feature to a python based devcontainer

[2025-05-15T22:54:47.556Z] 
46.02 Installing common Rust dependencies...
46.09 error: toolchain 'stable-x86_64-unknown-linux-gnu' does not contain component 'rls' for target 'x86_64-unknown-linux-gnu'; did you mean 'rustc'?
46.10 ERROR: Feature "Rust" (ghcr.io/devcontainers/features/rust) failed to install! Look at the documentation at https://github.com/devcontainers/features/tree/main/src/rust for help troubleshooting this error.
[2025-05-15T22:54:47.556Z] ------
[2025-05-15T22:54:47.556Z] failed to solve: process "/bin/sh -c cp -ar /tmp/build-features-src/rust_4 /tmp/dev-container-features  && chmod -R 0755 /tmp/dev-container-features/rust_4  && cd /tmp/dev-container-features/rust_4  && chmod +x ./devcontainer-features-install.sh  && ./devcontainer-features-install.sh  && rm -rf /tmp/dev-container-features/rust_4" did not complete successfully: exit code: 1

I would recommend adding rust-analyzer as a replacement for rls. Additionally, perhaps we drop support for versions of rust older than 1.64 to prevent issues since rust-analyzer was released during 1.64

Sources:
https://doc.rust-lang.org/stable/releases.html#misc-6
rust-lang/rust#98640

[liskin]

I would recommend adding rust-analyzer as a replacement for rls.

I don't think this is necessary. VSCode downloads and uses its own copy of rust-analyzer. Not sure if enough people use emacs/neovim in a devcontainer/Codespaces to justify installing it using rustup as well.

(I mean, not that I really care… but if I were to add it I'd like to understand why I'm doing it.)

[KarstenB]

Just ran into this as well. I also think that most tools either install it themselves or don't use it. Complete removal is fine for me. Another option would be to add a components option and allow to override the components that are to be installed.