: Caches are typically isolated by operating system. A cache created on ubuntu-latest will not be available for a windows-latest runner.
name: Cache Debug
Once set, re-run your workflow. You will see logs prefixed with [debug] inside the cache step.
. This happens when a previous run successfully saved a state that is technically valid but functionally broken. debug-action-cache
- name: Cache Node Modules uses: actions/cache@v4 with: path: ~/.npm key: $ runner.os -node-$ hashFiles('**/package-lock.json') Use code with caution.
Mastering the Action Cache: A Complete Guide to Debugging Cache Misses and Optimizing CI/CD Build Systems
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. : Caches are typically isolated by operating system
But what happens when caching breaks? What happens when your cache restore takes 10 minutes, or worse, corrupts your build?
gh secret set ACTIONS_RUNNER_DEBUG --body true
use backslashes ( C:\Users\runneradmin\.npm ) and case-insensitive paths. You will see logs prefixed with [debug] inside
By mastering these techniques, you can ensure your Bazel builds remain fast and efficient, minimizing re-execution and maximizing the utility of the action cache. If you'd like me to dive deeper, I can explain: How to set up with Docker How to fix specifically non-hermetic actions
- name: Cache dependencies uses: actions/cache@v4 with: path: | ~/.npm node_modules key: $ runner.os -npm-$ hashFiles('package-lock.json') restore-keys: | $ runner.os -npm-
Run Bazel with --verbose_failures to see if there are errors reading from or writing to the remote cache 2.2.1.
You can use this report to document findings after debugging cache misses, corruption, or restore failures.