steps:
  # Rustup is currently installed on Windows and Linux, but not macOS.
  # It is installed in /usr/local/cargo/bin/ or C:\Program Files\Rust\.cargo\bin\
  # This steps ensures that rustup is installed, mainly for macOS, or if the
  # azure image changes in the future.
  - bash: |
      set -ex
      if [ -x "`command -v rustup`" ]; then
        echo `command -v rustup` `rustup -V` already installed
        rustup self update
      else
        if [ "$AGENT_OS" = "Windows_NT" ]; then
          curl -sSf -o rustup-init.exe https://win.rustup.rs
          ./rustup-init.exe -y --default-toolchain $TOOLCHAIN
          echo "##vso[task.prependpath]$USERPROFILE/.cargo/bin"
        else
          curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $TOOLCHAIN
          echo "##vso[task.prependpath]$HOME/.cargo/bin"
        fi
      fi
    displayName: Install rustup

  - bash: |
      set -ex
      rustup update $TOOLCHAIN
      rustup default $TOOLCHAIN
    displayName: Install rust

  - bash: |
      set -ex
      rustc -Vv
      cargo -V
    displayName: Query rust and cargo versions