action.yml

name: 'Wipe Github Actions cache'
description: 'Wipes all Github Actions caches for a repository.'
branding:
  icon: 'archive'
  color: 'orange'
inputs:
  github-token:
    description: 'Your GITHUB_TOKEN.'
    required: false
    default: ${{ github.token }}
  dry-run:
    description: 'List caches only, do not clear them.'
    required: false
    default: 'false'
  page-size:
    description: 'Page size for cache listing.'
    required: false
    default: '100'
runs:
  using: "composite"
  steps:
    - name: List caches
      id: list-caches
      shell: bash
      env:
        GH_TOKEN: ${{ inputs.github-token }}
        PAGE_SIZE: ${{ inputs.page-size }}
      run: |
        function list_caches {
          local pageindex="$1"
          gh api \
            -H 'Accept: application/vnd.github+json' \
            "/repos/${GITHUB_REPOSITORY}/actions/caches?per_page=${PAGE_SIZE}&page=${pageindex}"
        }

        pageindex=1

        echo "fetching page ${pageindex}..."
        first="$(list_caches "${pageindex}")"
        total_count="$(jq -r '.total_count' <<< "${first}")"
        all_ids="$(jq '.actions_caches[].id' <<< "${first}" | tr '\n' ' ')"

        remaining="$((total_count-PAGE_SIZE))"
        echo "  cache ids in page ${pageindex}: ${all_ids}, ${remaining} remaining."
        while [[ $remaining > 0 ]]; do
          pageindex="$((pageindex+1))"
          echo "fetching page ${pageindex}..."
          ids="$(list_caches "${pageindex}" | jq '.actions_caches[].id' | tr '\n' ' ')"

          all_ids="${all_ids} ${ids}"
          remaining="$((remaining-PAGE_SIZE))"
          if [[ $remaining < 0 ]]; then remaining=0; fi
          echo "  cache ids in page ${pageindex}: ${ids}, ${remaining} remaining."
        done

        echo "cache ids total: ${all_ids}"
        echo "cache_ids=$all_ids" >> "$GITHUB_OUTPUT"

    - name: Wipe caches
      id: wipe
      shell: bash
      env:
        GH_TOKEN: ${{ inputs.github-token }}
      run: |
        for id in ${{ steps.list-caches.outputs.cache_ids }}; do
          if [[ "${{ inputs.dry-run }}" == 'true' ]]; then
            echo "would delete cache $id using following command:"
            echo gh api \
              --method DELETE \
              -H 'Accept: application/vnd.github+json' \
              "/repos/${GITHUB_REPOSITORY}/actions/caches/$id"
          else
            echo "deleting cache $id"
            gh api \
              --method DELETE \
              -H 'Accept: application/vnd.github+json' \
              "/repos/${GITHUB_REPOSITORY}/actions/caches/$id"
          fi
        done