cache-clean.yml

name: Cache Clean

on:
  workflow_dispatch:
    inputs:
      all-branches:
        type: boolean
        description: "Delete caches for all branches (nuclear option)"
  pull_request:
    types:
      - closed

permissions:
  actions: write

jobs:
  clear-cache:
    runs-on: ubuntu-latest
    steps:
      - name: Delete caches
        uses: actions/github-script@v7
        with:
          script: |
            let totalDeleted = 0;
            let totalBytes = 0;
            let pageSize = 100;
            let inputs = context.payload.inputs;
            let ref = context.ref;

            if (inputs && inputs["all-branches"] == "true") {
              console.warn("Deleting caches for all branches");
              ref = undefined;
            }

            function sizeInMb(size) {
              return (size / 1024 / 1024).toFixed(2);
            }

            async function fetchCaches(params) {
              return github.rest.actions.getActionsCacheList({
                owner: context.repo.owner,
                repo: context.repo.repo,
                ...params
              });
            }

            async function fetchAllCaches(ref) {
              let currentPage = 1;
              let currentCaches = await fetchCaches({ per_page: pageSize, page: currentPage, ref: ref });
              let totalCount = currentCaches.data.total_count;
              let allCaches = currentCaches.data.actions_caches;

              console.log(`Found ${totalCount} caches for ref ${ref} (page ${currentPage} of ${Math.ceil(totalCount / pageSize)})`);

              while (true) {
                if (allCaches.length >= totalCount || currentPage > 100) {
                  break;
                } else {
                  currentPage++;
                  currentCaches = await fetchCaches({ per_page: pageSize, page: currentPage, ref: ref });
                  allCaches = allCaches.concat(currentCaches.data.actions_caches);
                }
              }

              return allCaches;
            }

            async function deleteCachesForRef(ref) {
              let caches = await fetchAllCaches(ref);
              for (let cache of caches) {
                totalDeleted++;
                totalBytes += cache.size_in_bytes;

                await github.rest.actions.deleteActionsCacheById({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  cache_id: cache.id
                });

                console.log(`Deleted cache ${cache.id} (${sizeInMb(cache.size_in_bytes)} MB) for ref ${cache.ref}`);
              }
            }

            await deleteCachesForRef(ref);
            let totalMb = sizeInMb(totalBytes);
            console.log(`Clear completed, deleted ${totalDeleted} caches (${totalMb} MB)`);