Debug-action-cache __exclusive__ -
To debug a GitHub Actions cache issue, the most direct method is to enable Step Debug Logging. This reveals detailed cache keys, hit/miss logs, and download URLs in your workflow run. 🛠️ Essential Debugging Steps
- Debug Step: List the directory structure before attempting to cache.
7. Prevention / Recommendations
- Enable debug logging permanently for cache troubleshooting in a separate workflow.
- Use cache version prefix (e.g.,
v1-...) to allow manual invalidation. - Regularly audit cache size with
gh cache list --repo <repo>. - For self-hosted runners, configure an external cache backend (e.g.,
@actions/cachewith Azure Blob).
Hermeticity: Ensure your build actions don't access the internet or arbitrary file system locations. debug-action-cache
In modern DevOps, the "action cache" stores intermediate build artifacts and dependencies. However, debugging these caches is notoriously difficult because they are often opaque, immutable, and distributed across various runner environments. A debug-action-cache utility serves as a diagnostic bridge, allowing engineers to inspect the state of cached assets without manual intervention. 2. The Problem: The "Black Box" Cache To debug a GitHub Actions cache issue, the