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-# GitHub Action for GraalVM
+# GitHub Action for GraalVM [![build-test](https://github.com/graalvm/setup-graalvm/actions/workflows/test.yml/badge.svg)](https://github.com/graalvm/setup-graalvm/actions/workflows/test.yml)
+This GitHub action sets up [GraalVM Community Edition][repo] and GraalVM components such as [Native Image][native-image] and [GraalVM languages][graalvm-languages].
+
+## Key Features
+
+This action:
+
+- supports GraalVM CE [releases], [nightly builds][nightly], building from [source][repo], and [Mandrel][mandrel] (see [options](#options))
+- has built-in support for GraalVM components and the [GraalVM updater][gu]
+- exports a `$GRAALVM_HOME` environment variable
+- adds `$GRAALVM_HOME/bin` to the `$PATH` environment variable<br>(GraalVM tools such as `gu` and GraalVM languages can be invoked directly)
+- sets `$JAVA_HOME` to `$GRAALVM_HOME` by default<br>(can be disabled via `set-java-home: 'false'`, see [options](#options))
+- sets up Windows environments with build tools using [vcvarsall.bat][vcvarsall]
+
+
+## Templates
+
+### Quickstart Template
+
+```yml
+name: GraalVM build
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: graalvm/setup-graalvm@v1
+        with:
+          version: 'latest'
+          java-version: '11'
+          components: 'native-image'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Example step
+        run: |
+          echo "GRAALVM_HOME: $GRAALVM_HOME"
+          echo "JAVA_HOME: $JAVA_HOME"
+          java --version
+          gu --version
+          native-image --version
+```
+
+### Complex Native Image Template
+
+```yml
+name: GraalVM Native Image build
+on: [push, pull_request]
+jobs:
+  build:
+    name: ${{ matrix.version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        version: [latest, nightly, '21.3.0']
+        os: [macos-latest, windows-latest, ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: graalvm/setup-graalvm@v1
+        with:
+          version: ${{ matrix.version }}
+          java-version: '11'
+          components: 'native-image'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and run HelloWorld.java
+        run: |
+          javac HelloWorld.java
+          native-image HelloWorld
+          ./helloworld
+        if: runner.os != 'Windows'
+      
+      - name: Build and run HelloWorld.java on Windows
+        run: |
+          javac.exe HelloWorld.java
+          native-image.cmd HelloWorld
+          ./helloworld.exe
+        if: runner.os == 'Windows'
+      
+      - name: Upload binary
+        uses: actions/upload-artifact@v2
+        with:
+          name: helloworld-${{ matrix.os }}-${{ matrix.version }}
+          path: helloworld*
+```
+
+
+## Options
+
+| Name            | Default  | Description |
+|-----------------|:--------:|-------------|
+| `version`<br>*(required)* | n/a | `X.Y.Z` (e.g., `22.0.0`) for a specific [GraalVM release][releases]<br>`latest` for [latest stable release][stable],<br>`nightly` for [latest nightly build][nightly],<br>`trunk` for building GraalVM from [source][repo] (slow, can take several minutes),<br>`mandrel-X.Y.Z` (e.g., `mandrel-21.3.0.0-Final`) for a specific [Mandrel release][mandrel-releases], or<br>`mandrel-latest` for [latest Mandrel stable release][mandrel-stable]. |
+| `java-version`<br>*(required)* | n/a | `'11'` or `'17'` for a specific Java version.<br>(`'8'` and `'16'` are supported for GraalVM 21.2 and earlier.) |
+| `components`    | `''`     | Comma-spearated list of GraalVM components (e.g., `native-image` or `ruby,nodejs`) that will be installed by the [GraalVM Updater][gu]. |
+| `github-token`  | `''`     | Token for communication with the GitHub API. Please set to `${{ secrets.GITHUB_TOKEN }}` (see [templates](#templates)) to allow the action to authenticate with the GitHub API, which helps to reduce rate limiting issues. |
+| `set-java-home` | `'true'` | If set to `'true'`, instructs the action to set `$JAVA_HOME` to the path of the GraalVM installation. |
+
+## Contributing
+
+We welcome code contributions. To get started, you will need to sign the [Oracle Contributor Agreement][oca] (OCA).
+
+Only pull requests from committers that can be verified as having signed the OCA can be accepted.
+
+
+[graalvm-languages]: https://www.graalvm.org/reference-manual/languages/
+[gu]: https://www.graalvm.org/reference-manual/graalvm-updater/
+[mandrel]: https://github.com/graalvm/mandrel
+[mandrel-releases]: https://github.com/graalvm/mandrel/releases
+[mandrel-stable]: https://github.com/graalvm/mandrel/releases/latest
+[native-image]: https://www.graalvm.org/native-image/
+[nightly]: https://github.com/graalvm/graalvm-ce-dev-builds/releases/latest
+[oca]: https://oca.opensource.oracle.com
+[releases]: https://github.com/graalvm/graalvm-ce-builds/releases
+[repo]: https://github.com/oracle/graal
+[stable]: https://github.com/graalvm/graalvm-ce-builds/releases/latest
+[vcvarsall]: https://docs.microsoft.com/en-us/cpp/build/building-on-the-command-line