name: cache-folly
description: Cache folly build to speed up CI
outputs:
  cache-hit:
    description: Whether the cache was hit
    value: ${{ steps.cache-folly-build.outputs.cache-hit }}
runs:
  using: composite
  steps:
  - name: Extract FOLLY_COMMIT_HASH from Makefile
    id: extract-folly-hash
    shell: bash
    run: |
      FOLLY_COMMIT_HASH=$(grep '^FOLLY_COMMIT_HASH' Makefile | awk '{print $3}')
      echo "hash=$FOLLY_COMMIT_HASH" >> $GITHUB_OUTPUT
  - name: Cache folly build
    id: cache-folly-build
    uses: actions/cache@v4
    with:
      # Cache the folly build directory
      path: /tmp/fbcode_builder_getdeps-Z__wZrocksdbZrocksdbZthird-partyZfollyZbuildZfbcode_builder-root/installed
      # Key is based on:
      # - OS and architecture
      # - The specific folly commit hash from Makefile
      # - The container image version to account for different compiler/library versions
      key: folly-build-${{ runner.os }}-${{ runner.arch }}-${{ steps.extract-folly-hash.outputs.hash }}-ubuntu22.1-v1