github-cache-cleanup.yml

name: Purge All GitHub Caches

on:
  workflow_dispatch:
  workflow_call:

permissions:
  actions: write
  contents: read

jobs:
  purge-cache:
    runs-on: ubuntu-latest

    steps:
      - name: Verify GH CLI
        run: |
          set -euo pipefail
          if ! command -v gh >/dev/null 2>&1; then
            echo "gh CLI not found. Installing..."
            curl -fsSL https://github.com/cli/cli/releases/latest/download/gh_$(uname -s)_amd64.tar.gz -o /tmp/gh.tar.gz
            tar -xzf /tmp/gh.tar.gz -C /tmp
            sudo /tmp/gh_*/bin/gh --version || true
          fi
          gh --version

      - name: Purge all caches
        if: github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch' || github.run_attempt > 1
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          echo "========================================="
          echo "🗑️  Purging All GitHub Caches"
          echo "Repository: $GITHUB_REPOSITORY"
          echo "Started at: $(date -u '+%Y-%m-%d %H:%M:%S UTC')"
          echo "========================================="
          
          TOTAL_DELETED=0
          TOTAL_FAILED=0
          ITERATION=1
          MAX_ITERATIONS=50
          
          # Helper: delete single cache id with retries
          delete_cache() {
            local id="$1"
            local attempt=1
            local max_attempts=3
            while [ "$attempt" -le "$max_attempts" ]; do
              if gh api --method DELETE "repos/$GITHUB_REPOSITORY/actions/caches/$id" --silent >/dev/null 2>&1; then
                return 0
              fi
              sleep $((attempt * 2))
              attempt=$((attempt + 1))
            done
            return 1
          }
          
          while true; do
            echo "-----------------------------------------"
            echo "🔄 Iteration $ITERATION"
            echo "-----------------------------------------"
          
            # Fetch all cache ids using pagination; output one id per line
            if ! OUTPUT=$(gh api --paginate "repos/$GITHUB_REPOSITORY/actions/caches" --jq '.actions_caches[].id' 2>&1); then
              echo "❌ Failed to list caches"
              echo "Output: $OUTPUT"
              exit 1
            fi
          
            # Read into array safely
            mapfile -t CACHE_IDS < <(printf '%s\n' "$OUTPUT")
          
            # Trim and filter empties
            FILTERED=()
            for id in "${CACHE_IDS[@]}"; do
              id_trimmed="$(printf '%s' "$id" | tr -d '[:space:]')"
              if [ -n "$id_trimmed" ]; then
                FILTERED+=("$id_trimmed")
              fi
            done
            CACHE_IDS=("${FILTERED[@]}")
          
            if [ ${#CACHE_IDS[@]} -eq 0 ]; then
              echo "No more caches found. Done!"
              break
            fi
          
            echo "Found ${#CACHE_IDS[@]} cache(s) to delete"
            echo ""
          
            COUNTER=0
            for cache_id in "${CACHE_IDS[@]}"; do
              COUNTER=$((COUNTER+1))
              echo "[$COUNTER/${#CACHE_IDS[@]}] Deleting cache ID: $cache_id"
              if delete_cache "$cache_id"; then
                echo "  ✅ Deleted $cache_id"
                TOTAL_DELETED=$((TOTAL_DELETED+1))
              else
                echo "  ❌ Failed to delete $cache_id"
                TOTAL_FAILED=$((TOTAL_FAILED+1))
              fi
            done
          
            echo ""
            echo "Iteration $ITERATION summary: deleted $COUNTER this pass"
            echo "Total deleted so far: $TOTAL_DELETED"
            echo "Total failed so far: $TOTAL_FAILED"
            echo ""
          
            ITERATION=$((ITERATION+1))
            if [ "$ITERATION" -gt "$MAX_ITERATIONS" ]; then
              echo "⚠️  Reached max iterations ($MAX_ITERATIONS). Stopping."
              break
            fi
          
            # Small pause to avoid hitting rate limits
            sleep 1
          done
          
          echo ""
          echo "========================================="
          echo "✅ Purge Completed!"
          echo "Ended at: $(date -u '+%Y-%m-%d %H:%M:%S UTC')"
          echo "Total deleted: $TOTAL_DELETED"
          echo "Total failed: $TOTAL_FAILED"
          echo "========================================="