Do rustup installed components such as rls supposed to be usable on NixOS?

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1

I think I had rls functional at some point after installed via:

rustup component add rls rust-analysis rust-src

Today when I wanted to test my LSP client with it, I got the os error -2 error:

zsh: no such file or directory: /home/doron/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rls

Thankfully, nixos.rls is usable so I’m using it at the moment.

2

You might have to run rustup update if you changed your NixOS. Some of
the patches libraries might no longer be available.

3

No, didn’t help:

$ ls -l $(where rls)
lrwxrwxrwx 1 root root 65 Jan  1  1970 /run/current-system/sw/bin/rls -> /nix/store/2syaznc6mbxyfhdds8fdq8svjwp8mx7z-rustup-1.21.1/bin/rls
$ rls
error: command failed: 'rls'
error: caused by: No such file or directory (os error 2)
$ rustup component add rls rust-analysis rust-src
info: component 'rls' for target 'x86_64-unknown-linux-gnu' is up to date
info: component 'rust-analysis' for target 'x86_64-unknown-linux-gnu' is up to date
info: component 'rust-src' is up to date
$ rustup update
info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'

  stable-x86_64-unknown-linux-gnu unchanged - (error reading rustc version)

info: cleaning up downloads & tmp directories

That message saying “error reading rustc version” is suspicious but I don’t know what to do with it…

4

rustup update solved this for me

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5

rustup toolchain uninstall stable && rustup toolchain install stable solved for me. Seems to be some unmatching after an update or something.

6

Yeah, rustup does binary patching exactly once at install time. When the linker used for that patching vanishes, the rustup managed binaries will also stop working.

A workflow that is slightly more prefered and still considers your tool-chain.toml is described by @viperML in this blogpost:

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7

I should dig more in the docs to help improving that eventually. thanks for the heads up

8

Sidenote: Is there a reason to use RLS over Rust Analyzer? I thought RLS was deprecated and actually removed from current rust versions now

9

The original post was from 2020 when rust-analyzer was not the official language server

10

This post is around 1 year old.