tailscale 0.5.0

A work-in-progress Tailscale implementation
Documentation 
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name: setup rust
description: Setup rust toolchain and caches.

inputs:
  toolchain-version:
    description: Rust toolchain version to use.
    required: true

  builder-triple:
    description: Target-triple of builder system.
    required: true

  targets:
    description: Comma-separated list of additional targets to install.
    default: ""

  components:
    description: Comma-separated list of components installed with the toolchain.
    default: ""
    required: true

  cache-key:
    description: Cache-busting key. If you set this to anything other than its default, it will bust all caches and prevent sharing caches with other workflows.
    required: true
    default: init

outputs:
  toolchain_cache_hit:
    description: Did the rustup toolchain cache hit exactly?
    value: ${{ steps.cache-toolchain.outputs.cache-hit }}

  cache_hit:
    description: Did the cargo registry + `target/` cache hit exactly?
    value: ${{ steps.cache-rust.outputs.cache-hit }}

runs:
  using: composite

  steps:
    - name: Cache Rust toolchain
      id: cache-toolchain
      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
      with:
        path: ~/.rustup/toolchains
        key: rust-toolchain-${{ inputs.cache-key }}-${{ inputs.builder-triple }}-${{ inputs.toolchain-version }}-targets=${{ inputs.targets }}-components=${{ case(inputs.components == '', 'none', inputs.components) }}
        restore-keys: |
          rust-toolchain-${{ inputs.cache-key }}-${{ inputs.builder-triple }}-${{ inputs.toolchain-version }}-targets=${{ inputs.targets }}-components=
          rust-toolchain-${{ inputs.cache-key }}-${{ inputs.builder-triple }}-${{ inputs.toolchain-version }}-targets=

    - name: Install Rust toolchain
      id: install-toolchain
      uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # master 4/22/2026
      with:
        toolchain: ${{ inputs.toolchain-version }}
        components: ${{ inputs.components }}
        targets: ${{ inputs.builder-triple }},${{ inputs.targets }}

    - name: Set toolchain override
      shell: bash
      run: rustup override set ${{ inputs.toolchain-version }}

    - name: Limit dev-profile debug info
      shell: bash
      run: echo CARGO_PROFILE_DEV_DEBUG=line-tables-only >> $GITHUB_ENV

    - name: Cache cargo registry and target/
      id: cache-rust
      uses: Swatinem/rust-cache@c19371144df3bb44fab255c43d04cbc2ab54d1c4 # v2.9.1
      with:
        prefix-key: rust-${{ inputs.cache-key }}
        key: ${{ inputs.builder-triple }}-${{ inputs.toolchain-version }}
        cache-workspace-crates: true
        save-if: ${{ github.ref == 'refs/heads/main' }}
        cache-bin: false