Virtual-environments: Use rustup's minimal profile and remove rust-docs component

[lzutao]

Tool information

• Tool name: rustup
• Add or update? use rustup set profile minimal and remove rust-docs component
• Desired version: None
• Approximate size: None
• Rationale:
  rust-docs component is rarely used on most Rust project CI, except some Rust linter
  or spelling checker.
  Compare size with/without installing rust-docs:

400M    /home/lzutao/.rustup/toolchains/nightly-2020-03-19-x86_64-unknown-linux-gnu
733M    /home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu

Also, the Rust stable toolchain on Windows is not always up-to-date.
So many users may want to manually run rustup update stable on CI.
But rust-docs is large and contains of many files, which is slow for removing
and reinstalling.
Travis uses minimal profile and doesn't install rust-docs component with no problem.

Area for Triage: Rust

Question, Bug, or Feature?: Feature

Virtual environments affected

• [x] macOS 10.15
• [x] Ubuntu 16.04 LTS
• [x] Ubuntu 18.04 LTS
• [x] Windows Server 2016 R2
• [x] Windows Server 2019

Can this tool be installed during the build?

Are you willing to submit a PR?

If I could figure out how to do that.

[lzutao]

note for me: https://github.com/actions/virtual-environments/search?q=rustup&unscoped_q=rustup

[maxim-lobanov]

Hello @lzutao , thank you for contribution. I have run validation builds in your PR.
As for the macOS, it is not open-sourced for now so we will take care about macOS changes by ourselves after Windows / Ubuntu PR is merged.

On macOS, we use the following code to install Rust:

brew install rustup-init
rustup-init -y --no-modify-path

So it looks like we should just add --default-toolchain=stable --profile=minimal parameters to rustup-init line. Please confirm since you have more context with Rust.

[lzutao]

Yes, that's it.
If you run rustup-init --help, you will have the help menu:

The installer for rustup

USAGE:
    rustup [FLAGS] [OPTIONS]

FLAGS:
    -v, --verbose           Enable verbose output
    -q, --quiet             Disable progress output
    -y                      Disable confirmation prompt.
        --no-modify-path    Don't configure the PATH environment variable
    -h, --help              Prints help information
    -V, --version           Prints version information

OPTIONS:
        --default-host <default-host>              Choose a default host triple
        --default-toolchain <default-toolchain>    Choose a default toolchain to install
        --profile <profile>                         [default: default]  [possible values: minimal, default, complete]
    -c, --component <components>...                Component name to also install
    -t, --target <targets>...                      Target name to also install

[maxim-lobanov]

Windows / Ubuntu changes will be deployed in a few days.
@lzutao , I have done the same changes for macOS, they will be deployed next week

[lzutao]

Thanks for letting me know about that!

[maxim-lobanov]

Changes should be delivered to all images. Thank you for contribution.
Please let me know if something works incorrectly