将rustc安装在其他用户的主目录中时，如何执行？

Question

I downloaded and installed the Rust compiler via:

sudo curl https://sh.rustup.rs -sSf | sh

Although prefixed with sudo, it still installs to a local directory: $HOME/.cargo

From the account where it is installed, doing rustc --version gives 1.16.0 (...) .

I would like to execute rustc from a Linux account different than the one in which it was installed. Is this possible?

I created a logical link to the .cargo directory and added $HOME/.cargo/bin to the front of my PATH.

But, rustc --version from this other account gives this puzzling message:

error: no default toolchain configured

Answer 1

If you install via rustup (which is recommended) you have two important folders in your home directory: .cargo and .rustup (and depending on your version a soft link .multirust pointing to .rustup for backwards-compatibility reasons). So you also have to create a link to .rustup . That's what the strange error message is all about.

I would like to execute rustc from a Linux account different than the one in which it was installed. Is this possible?

This, however, is a different question. It's important to note that many commands, even just cargo build , will attempt to write in one of those directories (in case of cargo build to cache downloaded crates). If the second user has full read/write/execute permissions inside both directories mentioned above, it should work -- but it's quite questionable if that's a good solution. If you want, you can move both folders anywhere you like, give both users full permissions to both and create soft-links per user.

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But again, depending on how much privacy is needed, it gets more complicated (but if, say, you have an account for your work and one account for your hobby stuff, this isn't that important). Here is an overview over both folders:

• ~/.cargo/<several files> : small, user specific, somewhat confidential files (may contain login data for crates.io)
• ~/.cargo/bin : installed programs and proxies for programs (around 100MB), execute permission needed
• ~/.cargo/registry : library cache, can get quite big, not confidential
• ~/.rustup/toolchains : installed compiler versions and everything else you can install via rustup
• ~/.rustup/<tmp and update-hashes> : somewhat temporary files
• ~/.rustup/settings.toml : small, user specific

So depending in your needs you can have real .cargo and .rustup folders in your home directory and just soft link the folders like .cargo/bin and so on.