Debug-action-cache |best| -

Understanding the Debug-Action-Cache In the world of modern software development, speed is a competitive advantage. As codebases grow, build times often become a bottleneck, leading developers to implement remote caching or action caching (commonly seen in tools like Bazel, Gradle, or Nx). While these systems drastically reduce build times by reusing outputs from previous tasks, they introduce a unique set of challenges. When a cache returns an incorrect or outdated result—a phenomenon known as "cache poisoning"—understanding how to debug the action cache becomes a critical skill. The Role of the Action Cache

• Cache pinning (lock a cache version).
• Cache diffing (show what changed between two cache hits).
• Native CLI (gh cache inspect).

2. Use the actions/cache Debug Output

If using actions/cache@v3, add the verbose input: debug-action-cache

hashFiles('package-lock.json') = d41d8cd98f00b204e9800998ecf8427e

Hermeticity: Ensure your build actions don't access the internet or arbitrary file system locations. Understanding the Debug-Action-Cache In the world of modern

env:
  ACTIONS_RUNNER_DEBUG: true
  ACTIONS_STEP_DEBUG: true

Local Testing: Use tools like nektos/act or the GitHub Local Actions VS Code extension to run your workflows locally and test cache logic without waiting for cloud runners. Cache pinning (lock a cache version)