cache/README.md

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# cache
This GitHub Action allows caching dependencies and build outputs to improve workflow execution time.
## Usage
### Pre-requisites
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).
### Inputs
* `path` - A directory to store and save the cache
* `key` - An explicit key for restoring and saving the cache
* `restore-keys` - An ordered list of keys to use for restoring the cache if no cache hit occurred for key
### Outputs
* `cache-hit` - A boolean value to indicate an exact match was found for the key
> See [Skipping steps based on cache-hit](#Skipping-steps-based-on-cache-hit) for info on using this output
### Example workflow
```yaml
name: Example Caching with npm
on: push
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v1
- name: Cache node_modules
uses: actions/cache@preview
with:
path: node_modules
key: ${{ runner.os }}-node
- name: Install Dependencies
run: npm install
- name: Build
run: npm run build
- name: Test
run: npm run test
```
## Ecosystem Examples
### Node - npm
```yaml
- uses: actions/cache@preview
with:
path: node_modules
key: ${{ runner.os }}-node
```
### Node - Yarn
```yaml
- uses: actions/cache@preview
with:
path: ~/.cache/yarn
key: ${{ runner.os }}-yarn-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}
restore-keys: |
${{ runner.os }}-yarn-
```
### C# - Nuget
```yaml
- uses: actions/cache@preview
with:
path: ~/.nuget/packages
key: ${{ runner.os }}-nuget-${{ hashFiles('**/packages.lock.json') }}
restore-keys: |
${{ runner.os }}-nuget-
```
### Java - Gradle
```yaml
- uses: actions/cache@preview
with:
path: ~/.gradle/caches
key: gradle-${{ runner.os }}-${{ hashFiles('**/*.gradle') }}
restore-keys: |
gradle-${{ runner.os }}-
```
### Java - Maven
```yaml
- uses: actions/cache@preview
with:
path: ~/.m2/repository
key: ${{ runner.os }}-maven
```
## Cache Limits
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.
## Skipping steps based on cache-hit
Using the `cache-hit` output, subsequent steps (such as install or build) can be skipped when a cache hit occurs on the key.
Example:
```yaml
steps:
- uses: actions/checkout@v1
- uses: actions/cache@preview
id: cache
with:
path: path/to/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles')}}
- name: Install Dependencies
if: steps.cache.outputs.cache-hit != 'true'
run: /install.sh
```
> Note: The `id` defined in `actions/cache` must match the `id` in the `if` statement (i.e. `steps.[ID].outupts.cache-hit`)
## Contributing
We would love for you to contribute to `@actions/cache`, pull requests are welcome! Please see the [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
## License
The scripts and documentation in this project are released under the [MIT License](LICENSE)