Doesn't work on Flatpak: "Rust-analyzer failed to load workspace: Failed to read Cargo metadata from Cargo.toml file"

[DanielProg39]

Sorry, I know that similar issues were opened several times (#3118, #3885), but I have no idea about what causes my problem.
This is what notification from rust-analyzer looks like:

rust-analyzer failed to load workspace: Failed to read Cargo metadata from Cargo.toml file /home/user/projects/fibonacci/Cargo.toml, Some(Version { major: 1, minor: 62, patch: 1 }): Failed to run "/home/user/.cargo/bin/cargo" "metadata" "--format-version" "1" "--manifest-path" "/home/user/projects/fibonacci/Cargo.toml" "--filter-platform" "x86_64-unknown-linux-gnu": cargo metadata exited with an error: error: could not execute process rustc -vV (never executed) Caused by: No such file or directory (os error 2)

This is just an example, for showcasing I made a repo for that project, you can have a look on Cargo.toml and any other files here.

[lnicola]

error: could not execute process rustc -vV

Sounds like it couldn't run that. How did you install Rust, and do rustc -vV and cargo metadata work from the VS Code terminal (if you are using VS Code, that is)?

And please provide the information requested in the issue template:

rust-analyzer version: (eg. output of "rust-analyzer: Show RA Version" command, accessible in VSCode via Ctrl/⌘+Shift+P)

rustc version: (eg. output of rustc -V)

relevant settings: (eg. client settings, or environment variables like CARGO, RUSTC, RUSTUP_HOME or CARGO_HOME)

[DanielProg39]

rust-analyzer version: 0.3.1361-standalone
rustc version: 1.62.1 (e092d0b6b 2022-07-16)
relevant settings: idk, didn't change anything)

As far as I can remember, I installed Rust using a command provided on website, it just worked since then, I updated it couple times and didn't have any problems.
I use VSCodium, a libre fork of VS Code (binary provided by foss license) which doesn't change anything, I suppose.

do rustc -vV and cargo metadata work from the VS Code terminal

So here what I got:

rustc -vV

rustc 1.62.1 (e092d0b6b 2022-07-16)
binary: rustc
commit-hash: e092d0b6b43f2de967af0887873151bb1c0b18d3
commit-date: 2022-07-16
host: x86_64-unknown-linux-gnu
release: 1.62.1
LLVM version: 14.0.5

cargo metadata

warning: please specify --format-version flag explicitly to avoid compatibility problems
{"packages":[{"name":"fibonacci","version":"0.1.0","id":"fibonacci 0.1.0 (path+file:///home/user/projects/fibonacci)","license":null,"license_file":null,"description":null,"source":null,"dependencies":[],"targets":[{"kind":["bin"],"crate_types":["bin"],"name":"fibonacci","src_path":"/home/user/projects/fibonacci/src/main.rs","edition":"2021","doc":true,"doctest":false,"test":true}],"features":{},"manifest_path":"/home/user/projects/fibonacci/Cargo.toml","metadata":null,"publish":null,"authors":[],"categories":[],"keywords":[],"readme":null,"repository":null,"homepage":null,"documentation":null,"edition":"2021","links":null,"default_run":null,"rust_version":null}],"workspace_members":["fibonacci 0.1.0 (path+file:///home/user/projects/fibonacci)"],"resolve":{"nodes":[{"id":"fibonacci 0.1.0 (path+file:///home/user/projects/fibonacci)","dependencies":[],"deps":[],"features":[]}],"root":"fibonacci 0.1.0 (path+file:///home/user/projects/fibonacci)"},"target_directory":"/home/user/projects/fibonacci/target","version":1,"workspace_root":"/home/user/projects/fibonacci","metadata":null}

[lnicola]

So here what I got:

Did you run those from a terminal, or from the Code terminal? Does anything change if you run Code from a terminal?

[DanielProg39]

Ah, do you mean that I have to launch Code from the terminal? Well I ran those using terminal inside Code.
I checked an output with one using Code terminal when Code launched from terminal and with one using my system terminal emulator. It is the same everywhere.

[lnicola]

We just run cargo metadata with some arguments, if that can't find rustc, it's probably not our fault. Most users have problems because their PATH doesn't contain ~/.cargo/bin when they run Code from their DE, while running it from a terminal fixes this. Are you sure you don't have any weird environment variables set? You can try env | grep -P 'RUST|CARGO'.

[DanielProg39]

You can try env | grep -P 'RUST|CARGO'.

I tried, it returned nothing. I'm confused. I've compiled my programs many times succesfully and never had an issue.
It also could be that I use the Flatpak version of VSCodium and launch it in terminal with flatpak run com.vscodium.codium, so it, basically doesn't change anything. It also can be because maybe (I don't remember exactly) I had installed "Rust" add-on previously (I deleted it before installing rust-analyzer). What do you think?

[lnicola]

I think we have an issue or two about the Flatpak version. That seems like it could cause problems.

[DanielProg39]

Thanks, I will reinstall VSCodium asap and tell you about results

[DanielProg39]

Installing VSCodium from .deb repo resolved the problem. Probably an issue is about something with Flatpak