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Update README for v2
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README.md
136
README.md
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@ -2,9 +2,13 @@
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This GitHub Action can be used to execute a Gradle build on any platform supported by GitHub Actions.
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**Note:** The following documentation is for `gradle/gradle-build-action@v2`, currently in Beta release.
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You can view the documentation for the latest stable release (v1.5.1) [on the GitHub Marketplace](https://github.com/marketplace/actions/gradle-build-action?version=v1.5.1).
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## Usage
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The following workflow will run `./gradlew build` using the wrapper from the repository on ubuntu, macos and windows. The only prerequisite is to have Java installed: you define the version of Java you need to run the build using the `actions/setup-java` action.
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The following workflow will run `./gradlew build` on ubuntu, macos and windows.
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The only prerequisite is to have Java installed: you define the version of Java you need to run the build using the `actions/setup-java` action.
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```yaml
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# .github/workflows/gradle-build-pr.yml
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@ -21,12 +25,26 @@ jobs:
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- uses: actions/setup-java@v1
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with:
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java-version: 11
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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with:
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arguments: build
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```
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## Gradle arguments
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It is possible to configure multiple Gradle executions to run sequentially in the same job.
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Each invocation will start its run with the filesystem state remaining from the previous execution.
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```yaml
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- uses: gradle/gradle-build-action@v2
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with:
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arguments: assemble
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- uses: gradle/gradle-build-action@v2
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with:
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arguments: check
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```
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## Gradle Execution
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### Command-line arguments
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The `arguments` input can used to pass arbitrary arguments to the `gradle` command line.
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@ -42,42 +60,47 @@ arguments: build -DsystemProperty=bar
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See `gradle --help` for more information.
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If you need to pass environment variables, simply use the GitHub Actions workflow syntax:
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If you need to pass environment variables, use the GitHub Actions workflow syntax:
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```yaml
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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env:
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CI: true
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with:
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arguments: build
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```
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## Run a build from a different directory
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### Gradle build located in a subdirectory
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By default, the action will execute Gradle in the root directory of your project.
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Use the `build-root-directory` input to target a Gradle build in a subdirectory.
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```yaml
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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with:
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build-root-directory: some/subdirectory
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```
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## Use a specific `gradle` executable
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### Using a specific Gradle executable
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The action will first look for a Gradle wrapper script in the root directory of your project.
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If not found, `gradle` will be executed from the PATH.
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Use the `gradle-executable` input to execute using a specific Gradle installation.
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```yaml
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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with:
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gradle-executable: path/to/gradle
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gradle-executable: /path/to/installed/gradle
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```
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## Use a Gradle wrapper from a different directory
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This mechanism can also be used to target a Gradle wrapper script that is located in a non-default location.
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### Download, install and use a specific Gradle version
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The `gradle-build-action` is able to download and install a specific Gradle version to execute.
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```yaml
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- uses: gradle/gradle-build-action@v1
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with:
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gradle-executable: path/to/gradlew
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```
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## Setup and use a declared Gradle version
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```yaml
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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with:
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gradle-version: 6.5
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```
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@ -94,7 +117,7 @@ Moreover, you can use the following aliases:
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| `nightly` | The latest [nightly](https://gradle.org/nightly/), fails if none. |
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| `release-nightly` | The latest [release nightly](https://gradle.org/release-nightly/), fails if none. |
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This can be handy to, for example, automatically test your build with the next Gradle version once a release candidate is out:
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This can be handy to automatically verify your build works with the latest release candidate of Gradle:
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```yaml
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# .github/workflows/test-gradle-rc.yml
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- uses: actions/setup-java@v1
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with:
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java-version: 11
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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with:
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gradle-version: release-candidate
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arguments: build --dry-run # just test build configuration
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## Caching
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This action provides 3 levels of caching to help speed up your GitHub Actions:
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- `distributions` caches any distributions downloaded to satisfy a `gradle-version` parameter ;
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- `gradle-user-home` caches downloaded dependencies, wrapper distributions, and other stuff from the Gradle User home directory ;
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- `project-dot-gradle` caches stored [configuration-cache](https://docs.gradle.org/nightly/userguide/configuration_cache.html) state, saving time configuring the build.
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Each of these are enabled by default. To save caching space, you can disable any of them as follows:
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```yaml
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distributions-cache-enabled: true
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gradle-user-home-cache-enabled: true
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project-dot-gradle-cache-enabled: true
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```
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The distributions cache uses a cache key that is unique to the downloaded distribution. This will not change over time.
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The `gradle-user-home` and `project-dot-gradle` caches compute a cache key based on the current commit and the Gradle invocation.
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As such, these are likely to change on each subsequent run of GitHub actions, allowing the most recent state to always be available in the GitHub actions cache.
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By default, this action aims to cache any and all reusable state that may be speed up a subsequent build invocation.
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At this time it is not possible to fine-tune this caching. If you have a legitimate use case for fine-grained caching or restricting which files are cached, please raise an issue.
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The state that is cached includes:
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- Any distributions downloaded to satisfy a `gradle-version` parameter ;
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- A subset of the Gradle User Home directory, including downloaded dependencies, wrapper distributions, and the local build cache ;
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- Any [configuration-cache](https://docs.gradle.org/nightly/userguide/configuration_cache.html) data stored in the project `.gradle` directory.
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To reduce the space required for caching, this action makes a best effort to reduce duplication in cache entries.
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Caching is enabled by default. You can disable caching for the action as follows:
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```yaml
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cache-disabled: true
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```
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At this time it is not possible to fine-tune the caching performed by this action.
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If you have a legitimate use case for fine-grained caching or restricting which files are cached, please raise an issue.
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### Cache keys
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For cached distributions, the cache key is unique to the downloaded distribution. This will not change over time.
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The state of the Gradle User Home and configuration-cache are highly dependent on the Gradle execution, so the cache key is composed of the current commit hash and the GitHub actions job id.
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As such, the cache key is likely to change on each subsequent run of GitHub actions.
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This allows the most recent state to always be available in the GitHub actions cache.
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To reduce duplication between cache entries, certain artifacts are cached independently based on their identity.
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Artifacts that are cached independently include downloaded dependencies, downloaded wrapper distributions and generated Gradle API jars.
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For example, this means that all jobs executing a particular version of the Gradle wrapper will share common entries for wrapper distributions and for generated Gradle API jars.
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### Using the caches read-only
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In some circumstances, it makes sense for a Gradle invocation to read any existing cache entries but not to write changes back.
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For example, you may want to write cache entries for builds on your `main` branch, but not for any PR build invocations.
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You can enable read-only caching for any of the caches asfollows:
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You can enable read-only caching for any of the caches as follows:
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```yaml
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distributions-cache-enabled: read-only
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gradle-user-home-cache-enabled: read-only
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project-dot-gradle-cache-enabled: read-only
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cache-read-only: true
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```
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## Build scans
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If your build publishes a [build scan](https://gradle.com/build-scans/) the `gradle-build-action` action will emit the link to the published build scan as an output named `build-scan-url`.
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If your build publishes a [build scan](https://gradle.com/build-scans/) the `gradle-build-action` action will:
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- Add a notice with the link to the GitHub Actions user interface
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- Emit the link to the published build scan as an output named `build-scan-url`.
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You can then use that link in subsequent actions of your workflow.
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For example:
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You can then use that link in subsequent actions of your workflow. For example:
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```yaml
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# .github/workflows/gradle-build-pr.yml
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on: pull_request
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jobs:
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gradle:
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strategy:
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matrix:
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os: [ubuntu-latest, macos-latest, windows-latest]
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runs-on: ${{ matrix.os }}
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: actions/setup-java@v1
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with:
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java-version: 11
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- uses: gradle/gradle-build-action@v1
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- uses: gradle/gradle-build-action@v2
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id: gradle
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with:
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arguments: build
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id: gradle
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- name: "Comment build scan url"
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uses: actions/github-script@v3
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if: github.event_name == 'pull_request' && failure()
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