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91 lines
2.7 KiB
Markdown
91 lines
2.7 KiB
Markdown
# cache
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This GitHub Action allows caching dependencies and build outputs to improve workflow execution time.
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<a href="https://github.com/actions/cache"><img alt="GitHub Actions status" src="https://github.com/actions/cache/workflows/Tests/badge.svg"></a>
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## Usage
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### Pre-requisites
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Create a workflow `.yml` file in your repositories `.github/workflows` directory. An [example workflow](#example-workflow) is available below. For more information, reference the GitHub Help Documentation for [Creating a workflow file](https://help.github.com/en/articles/configuring-a-workflow#creating-a-workflow-file).
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### Inputs
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* `path` - A directory to store and save the cache
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* `key` - An explicit key for restoring and saving the cache
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* `restore-keys` - An ordered list of keys to use for restoring the cache if no cache hit occurred for key
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### Outputs
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* `cache-hit` - A boolean value to indicate an exact match was found for the key
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> See [Skipping steps based on cache-hit](#Skipping-steps-based-on-cache-hit) for info on using this output
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### Example workflow
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```yaml
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name: Example Caching with npm
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on: push
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v1
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- name: Cache node modules
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uses: actions/cache@preview
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with:
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path: node_modules
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key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
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restore-keys: |
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${{ runner.os }}-node-
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- name: Install Dependencies
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run: npm install
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- name: Build
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run: npm run build
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- name: Test
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run: npm run test
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```
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## Ecosystem Examples
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See [Examples](examples.md)
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## Cache Limits
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Individual caches are limited to 200MB and a repository can have up to 2GB of caches. Once the 2GB limit is reached, older caches will be evicted based on when the cache was last accessed.
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## Skipping steps based on cache-hit
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Using the `cache-hit` output, subsequent steps (such as install or build) can be skipped when a cache hit occurs on the key.
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Example:
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```yaml
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steps:
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- uses: actions/checkout@v1
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- uses: actions/cache@preview
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id: cache
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with:
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path: path/to/dependencies
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key: ${{ runner.os }}-${{ hashFiles('**/lockfiles')}}
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- name: Install Dependencies
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if: steps.cache.outputs.cache-hit != 'true'
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run: /install.sh
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```
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> Note: The `id` defined in `actions/cache` must match the `id` in the `if` statement (i.e. `steps.[ID].outputs.cache-hit`)
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## Contributing
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We would love for you to contribute to `@actions/cache`, pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
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## License
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The scripts and documentation in this project are released under the [MIT License](LICENSE)
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