cache/README.md

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# cache
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This action allows caching dependencies and build outputs to improve workflow execution time.
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<a href="https://github.com/actions/cache/actions?query=workflow%3ATests"><img alt="GitHub Actions status" src="https://github.com/actions/cache/workflows/Tests/badge.svg?branch=master&event=push"></a>
## Documentation
See ["Caching dependencies to speed up workflows"](https://help.github.com/github/automating-your-workflow-with-github-actions/caching-dependencies-to-speed-up-workflows).
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## What's New in V2
* Added support for caching multiple paths,
```yaml
- name: Cache multiple relative paths
uses: actions/cache@v2
with:
path: |
node_modules
dist
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
```
```yaml
- name: Cache multiple absolute paths
uses: actions/cache@v2
with:
path: |
~/cache
/path/to/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
```
[glob patterns](https://github.com/actions/toolkit/tree/master/packages/glob),
```yaml
- name: Cache using glob patterns
uses: actions/cache@v2
with:
path: |
**/*.ts
**/node_modules
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
```
and single file caches.
```yaml
- name: Cache single file
uses: actions/cache@v2
with:
path: cache.tar
key: ${{ runner.os }}
```
* Increased perfomance and improved cache sizes using `zstd` compression
> Note this feature is off for Windows runner that are using `bsdtar` (e.g., windows-latest hosted runner) due to a bug in ziping large random files with `bsdtar`
* Allowed caching for all events with a ref
> See [events that trigger workflow](https://help.github.com/en/actions/reference/events-that-trigger-workflows) for info on which events do not have a `GITHUB_REF`
* Released the [`@actions/cache`](https://github.com/actions/toolkit/tree/master/packages/cache) npm package to allow other actions to utilize caching
* Added a best-effort cleanup step to delete the archive after extraction to reduce storage space
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## 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
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* `path` - Directories to store and save the cache. Supports pattern matching, multipath and single file cache
> See [`@actions/glob`](https://github.com/actions/toolkit/tree/master/packages/glob) for supported patterns.
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* `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
### Cache scopes
The cache is scoped to the key and branch. The default branch cache is available to other branches.
See [Matching a cache key](https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows#matching-a-cache-key) for more info.
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### Example workflow
```yaml
name: Caching Primes
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on: push
jobs:
build:
runs-on: ubuntu-latest
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steps:
- uses: actions/checkout@v2
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- name: Cache Primes
id: cache-primes
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uses: actions/cache@v2
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with:
path: prime-numbers
key: ${{ runner.os }}-primes
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- name: Generate Prime Numbers
if: steps.cache-primes.outputs.cache-hit != 'true'
run: /generate-primes.sh -d prime-numbers
- name: Use Prime Numbers
run: /primes.sh -d prime-numbers
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```
## Implementation Examples
Every programming language and framework has its own way of caching.
See [Examples](examples.md) for a list of `actions/cache` implementations for use with:
- [C# - Nuget](./examples.md#c---nuget)
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- [D - DUB](./examples.md#d---dub)
- [Elixir - Mix](./examples.md#elixir---mix)
- [Go - Modules](./examples.md#go---modules)
- [Haskell - Cabal](./examples.md#haskell---cabal)
- [Java - Gradle](./examples.md#java---gradle)
- [Java - Maven](./examples.md#java---maven)
- [Node - npm](./examples.md#node---npm)
- [Node - Lerna](./examples.md#node---lerna)
- [Node - Yarn](./examples.md#node---yarn)
- [OCaml/Reason - esy](./examples.md##ocamlreason---esy)
- [PHP - Composer](./examples.md#php---composer)
- [Python - pip](./examples.md#python---pip)
- [R - renv](./examples.md#r---renv)
- [Ruby - Bundler](./examples.md#ruby---bundler)
- [Rust - Cargo](./examples.md#rust---cargo)
- [Scala - SBT](./examples.md#scala---sbt)
- [Swift, Objective-C - Carthage](./examples.md#swift-objective-c---carthage)
- [Swift, Objective-C - CocoaPods](./examples.md#swift-objective-c---cocoapods)
- [Swift - Swift Package Manager](./examples.md#swift---swift-package-manager)
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## Creating a cache key
A cache key can include any of the contexts, functions, literals, and operators supported by GitHub Actions.
For example, using the [`hashFiles`](https://help.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#hashfiles) function allows you to create a new cache when dependencies change.
```yaml
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- uses: actions/cache@v2
with:
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path: |
path/to/dependencies
some/other/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
```
Additionally, you can use arbitrary command output in a cache key, such as a date or software version:
```yaml
# http://man7.org/linux/man-pages/man1/date.1.html
- name: Get Date
id: get-date
run: |
echo "::set-output name=date::$(/bin/date -u "+%Y%m%d")"
shell: bash
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- uses: actions/cache@v2
with:
path: path/to/dependencies
key: ${{ runner.os }}-${{ steps.get-date.outputs.date }}-${{ hashFiles('**/lockfiles') }}
```
See [Using contexts to create cache keys](https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows#using-contexts-to-create-cache-keys)
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## Cache Limits
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A repository can have up to 5GB of caches. Once the 5GB limit is reached, older caches will be evicted based on when the cache was last accessed. Caches that are not accessed within the last week will also be evicted.
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## 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:
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- uses: actions/checkout@v2
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- uses: actions/cache@v2
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id: cache
with:
path: path/to/dependencies
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key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
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- 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].outputs.cache-hit`)
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## 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.
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## License
The scripts and documentation in this project are released under the [MIT License](LICENSE)