Add support for Mandrel.

src/constants.ts

@@ -15,5 +15,7 @@ export const GRAALVM_GH_USER = 'graalvm'
 export const GRAALVM_PLATFORM = IS_WINDOWS ? 'windows' : process.platform
 export const JDK_HOME_SUFFIX = IS_MACOS ? '/Contents/Home' : ''
 
+export const MANDREL_NAMESPACE = 'mandrel-'
+
 export type LatestReleaseResponse =
   otypes.Endpoints['GET /repos/{owner}/{repo}/releases/latest']['response']

src/main.ts

@@ -6,6 +6,7 @@ import {mkdirP} from '@actions/io'
 import {setUpDependencies} from './dependencies'
 import {setUpGUComponents} from './gu'
 import {setUpGraalVMTrunk} from './graalvm-trunk'
+import {setUpMandrel} from './mandrel'
 import {setUpWindowsEnvironment} from './msvc'
 
 async function run(): Promise<void> {
@@ -37,10 +38,14 @@ async function run(): Promise<void> {
         graalVMHome = await setUpGraalVMTrunk(javaVersion, components)
         break
       default:
-        graalVMHome = await graalvm.setUpGraalVMRelease(
-          graalvmVersion,
-          javaVersion
-        )
+        if (graalvmVersion.startsWith(c.MANDREL_NAMESPACE)) {
+          graalVMHome = await setUpMandrel(graalvmVersion, javaVersion)
+        } else {
+          graalVMHome = await graalvm.setUpGraalVMRelease(
+            graalvmVersion,
+            javaVersion
+          )
+        }
         break
     }
 
@@ -56,6 +61,10 @@ async function run(): Promise<void> {
     if (components.length > 0) {
       if (graalvmVersion === c.VERSION_TRUNK) {
         // components built from source, nothing to do
+      } else if (graalvmVersion.startsWith(c.MANDREL_NAMESPACE)) {
+        core.warning(
+          `Mandrel does not support GraalVM components: ${componentsString}`
+        )
       } else {
         await setUpGUComponents(graalVMHome, components)
       }

src/mandrel.ts

@@ -0,0 +1,57 @@
+import * as c from './constants'
+import {downloadAndExtractJDK, getLatestRelease} from './utils'
+
+const MANDREL_REPO = 'mandrel'
+const MANDREL_TAG_PREFIX = c.MANDREL_NAMESPACE
+const MANDREL_DL_BASE = 'https://github.com/graalvm/mandrel/releases/download'
+
+export async function setUpMandrel(
+  graalvmVersion: string,
+  javaVersion: string
+): Promise<string> {
+  const mandrelVersion = graalvmVersion.substring(
+    c.MANDREL_NAMESPACE.length,
+    graalvmVersion.length
+  )
+
+  let mandrelHome
+  switch (mandrelVersion) {
+    case 'latest':
+      mandrelHome = await setUpMandrelLatest(javaVersion)
+      break
+    default:
+      mandrelHome = await setUpMandrelRelease(mandrelVersion, javaVersion)
+      break
+  }
+
+  return mandrelHome
+}
+
+async function setUpMandrelLatest(javaVersion: string): Promise<string> {
+  const latestRelease = await getLatestRelease(MANDREL_REPO)
+  const tag_name = latestRelease.tag_name
+  if (tag_name.startsWith(MANDREL_TAG_PREFIX)) {
+    const latestVersion = tag_name.substring(
+      MANDREL_TAG_PREFIX.length,
+      tag_name.length
+    )
+    return setUpMandrelRelease(latestVersion, javaVersion)
+  }
+  throw new Error(`Could not find latest Mandrel release: ${tag_name}`)
+}
+
+async function setUpMandrelRelease(
+  version: string,
+  javaVersion: string
+): Promise<string> {
+  const identifier = determineMandrelIdentifier(version, javaVersion)
+  const downloadUrl = `${MANDREL_DL_BASE}/${MANDREL_TAG_PREFIX}${version}/${identifier}${c.GRAALVM_FILE_EXTENSION}`
+  return downloadAndExtractJDK(downloadUrl)
+}
+
+function determineMandrelIdentifier(
+  version: string,
+  javaVersion: string
+): string {
+  return `mandrel-java${javaVersion}-${c.GRAALVM_PLATFORM}-amd64-${version}`
+}