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To help tailor this guide, what (e.g., GitHub Actions, GitLab, Bazel) are you using, and what specific programming language or framework is running inside your pipeline? Share public link
: Set to true to enable verbose individual step logs. Add Debugging Variables to Your Workflow
[Restore Phase] ---> Looks for matching key ---> Downloads cache if found | [Execution Phase] -> Runs build/test scripts using cached assets | [Save Phase] ------> Evaluates if key exists -> Uploads new cache if key is unique
If the hash changes between two runs where you made no dependency changes, an automated script (like an internal linter or formatter) is altering the file mid-run. 4. Leverage Cache Eviction Clearances debug-action-cache
[debug] restoreKeys: [ 'Linux-pip-', 'Linux-' ] [debug] GET response for key 'Linux-pip-main-2d711b': 404 [debug] GET response for key 'Linux-pip-': 200 (Stored key: 'Linux-pip-staging-9c4a7b')
To debug the cache effectively, one must understand how it works under the hood.
: Systems like Next.js and Ruby on Rails cache asset compilation and data fetching layer by layer. To help tailor this guide, what (e
on: workflow_dispatch: inputs: debug_level: description: 'Debug level' default: 'full' type: choice options: ['full', 'basic']
: Provides a raw look at the current state of the local action cache. Common Troubleshooting Steps
Some advanced users also set RUNNER_TOOL_CACHE_DEBUG to true , but ACTIONS_STEP_DEBUG triggers the specific debug-action-cache protocol. Before modifying your workflow file
Step-by-Step Guide to Executing a debug-action-cache Workflow
GitHub Actions hides verbose system logs by default. Before modifying your workflow file, enable system-wide diagnostic logging to expose the hidden mechanics of the actions/cache step. To do this, add a secret to your GitHub repository: Go to > Secrets and variables > Actions . Create a New repository secret . Name: ACTIONS_STEP_DEBUG Value: true
In the world of modern DevOps, speed is currency. Every minute your Continuous Integration (CI) pipeline runs costs money and slows down developer feedback loops. GitHub Actions introduced to solve this—storing dependencies like node_modules , pip , or apt packages to avoid re-downloading them on every run.
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