Hi, I'm having issues understanding the exact behavior of having a customized Rust toolchain installation. I want to install cargo and related Rust toolchains to a specified location inside my project for our other tooling to use.
According to the document I found here (Installation - The rustup book), I can set RUSTUP_HOME and CARGO_HOME to the destination I want before I call rustup. But I still have some questions that I can't get answers to from the related docs:

• According to the same doc, I need to ensure RUSTUP_HOME and CARGO_HOME are defined in the env vars and CARGO_HOME/bin is in the PATH. Is that enough to use the toolchain I installed? Or is there any further actions I need to do to avoid interleaving between the user-level installation under $HOME/.cargo and $HOME/.rustup?
• What's the role of CARGO_HOME/env? Initially I though when sourcing this file, it's like Python's virtual env and it does all env settings automatically. But by looking at its content, it seems to only add CARGO_HOME/bin to the PATH.

In general, are there any references/resources I can look into for interacting with Rust toolchains with both the default installation (under $HOME) and customized installation?

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