default-branch-cache.yaml

# because apparently caches are isolated across branches
name: default-branch-cache

on:
  push:
    branches:
      - main

env:
  CARGO_TERM_COLOR: always

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
          override: true
      - name: Restore Cargo Cache
        id: cargo-cache
        uses: actions/cache/restore@v3
        with:
          path: |
            ~/.cargo/bin/
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
            target/
          # We can do this now because we use specific verison and update with Dependabot
          # but if we make the deps any less specifc, we'll have to fix
          key: ${{ runner.os }}-deps-${{ hashFiles('**/Cargo.toml') }}-${{ hashFiles('**/*.rs') }}
          # start from the previous set of cached dependencies
          restore-keys: |
            ${{ runner.os }}-deps-${{ hashFiles('**/Cargo.toml') }}-
            ${{ runner.os }}-deps-
      # TODO: do a `cargo fetch` here first
      - name: Check
        run: cargo check --workspace --tests --examples --benches
      - name: Build
        run: cargo build --workspace --tests --examples --benches
      - name: Delete old cache
        run: |
          gh extension install actions/gh-actions-cache

          REPO=${{ github.repository }}
          BRANCH=${{ github.ref }}

          echo "Fetching list of cache key"
          cacheKeysForPR=$(gh actions-cache list -R $REPO -B $BRANCH | cut -f 1 )

          ## Setting this to not fail the workflow while deleting cache keys.
          set +e
          echo "Deleting caches..."
          for cacheKey in $cacheKeysForPR
          do
              gh actions-cache delete $cacheKey -R $REPO -B $BRANCH --confirm
          done
          echo "Done"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Save Cargo Cache
        uses: actions/cache/save@v3
        with:
          path: |
            ~/.cargo/bin/
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
            target/
          key: ${{ steps.cargo-cache.outputs.cache-primary-key }}