Debug-action-cache Jun 2026

[debug] Resolved path: 'node_modules' -> '/home/runner/work/app/node_modules' [debug] Path exists: true [debug] Contents: [ 'react', 'lodash', '.bin' ]

However, caching systems are only as good as their correctness. When a cache returns an outdated artifact (a false positive) or misses an opportunity to reuse a valid one (a false negative), developers face broken builds and mysterious runtime errors.

Demystifying debug-action-cache : A Complete Guide to Troubleshooting Action Cache Issues

The cache action creates a .tar archive. Debug logs reveal segmentation: debug-action-cache

Set ACTIONS_RUNNER_DEBUG to true to view low-level background runner events.

In CI/CD environments (like GitHub Actions), an "action" or a "step" often downloads packages, compiles code, or sets up an environment. The action cache stores these outputs across workflow runs. How Cache Keys Work

Is this happening on , CI runners , or across both environments? Share public link How Cache Keys Work Is this happening on

"id": 123456, "key": "Linux-node-abc123", "size_in_bytes": 245000000, "created_at": "2025-04-01T10:00:00Z", "last_accessed_at": "2025-04-02T10:00:00Z"

After setting, re-run your workflow. The logs will now show detailed cache operations (e.g., “Cache not found for key”, “Restored cache with size X”).

A previous broken build successfully saved its incomplete or broken dependencies into the cache storage, causing all future runs to pull corrupted files. validates checksum integrity

Caching is the backbone of efficient Continuous Integration (CI), yet "cache poisoning" and "cache misses" frequently lead to non-deterministic build failures. This paper introduces a systematic approach to debug-action-cache mechanisms. We explore the implementation of a diagnostic layer that monitors cache hits, validates checksum integrity, and provides developers with actionable insights when a cache miss occurs .

to convert them to text for comparison (requires Bazel source code), as described in the official Bazel docs: