cache.yml

name: 🧹

on:
  workflow_dispatch:
  schedule:
    - cron: "47 20 * * 6"

concurrency:
  group: scheduled-maintenance
  cancel-in-progress: false

permissions:
  actions: write
  contents: read

env:
  TZ: Asia/Tokyo

jobs:
  cleanup:
    name: Clear Actions caches
    runs-on: ubuntu-latest
    steps:
      - name: Confirm repository is idle
        id: activity
        shell: bash
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

          active_runs="$(
            for status in queued in_progress requested waiting pending; do
              gh api --paginate \
                -H "Accept: application/vnd.github+json" \
                -H "X-GitHub-Api-Version: 2026-03-10" \
                "/repos/${GITHUB_REPOSITORY}/actions/runs?status=${status}&per_page=100" \
                --jq '.workflow_runs[] | [.id, .name, .run_number, .status] | @tsv'
            done |
              awk -F '\t' -v current="${GITHUB_RUN_ID}" '$1 != current {
                printf "%s #%s (%s)\n", $2, $3, $4
              }'
          )"

          if [[ -n "${active_runs}" ]]; then
            echo "ready=false" >> "${GITHUB_OUTPUT}"
            {
              echo "## Cache cleanup"
              echo
              echo "Cleanup was skipped because other workflow runs were active:"
              echo
              while IFS= read -r run; do
                echo "- ${run}"
              done <<< "${active_runs}"
            } >> "${GITHUB_STEP_SUMMARY}"
            exit 0
          fi

          echo "ready=true" >> "${GITHUB_OUTPUT}"

      - name: Delete repository caches
        if: steps.activity.outputs.ready == 'true'
        shell: bash
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

          mapfile -t cache_ids < <(
            gh api --paginate \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2026-03-10" \
              "/repos/${GITHUB_REPOSITORY}/actions/caches?per_page=100" \
              --jq '.actions_caches[].id'
          )

          for cache_id in "${cache_ids[@]}"; do
            gh api --method DELETE \
              -H "Accept: application/vnd.github+json" \
              -H "X-GitHub-Api-Version: 2026-03-10" \
              "/repos/${GITHUB_REPOSITORY}/actions/caches/${cache_id}" \
              --silent
          done

          {
            echo "## Cache cleanup"
            echo
            echo "- Deleted: \`${#cache_ids[@]}\`"
            echo "- Completed: \`$(date +'%Y-%m-%d %H:%M')\`"
          } >> "${GITHUB_STEP_SUMMARY}"