Set up GraalVM components with gu.

src/gu.ts

@@ -0,0 +1,38 @@
+import {GRAALVM_PLATFORM} from './constants'
+import {exec} from '@actions/exec'
+import {join} from 'path'
+
+const COMPONENT_TO_POST_INSTALL_HOOK = new Map<string, Map<string, string>>([
+  [
+    'linux',
+    new Map<string, string>([
+      ['ruby', 'languages/ruby/lib/truffle/post_install_hook.sh']
+      // ['R', 'languages/R/bin/configure_fastr'] (GR-36105: cannot be run non-interactively)
+    ])
+  ],
+  [
+    'darwin',
+    new Map<string, string>([
+      ['ruby', 'languages/ruby/lib/truffle/post_install_hook.sh']
+      // ['R', 'languages/R/bin/configure_fastr'] (GR-36105: cannot be run non-interactively)
+    ])
+  ]
+  // No post install hooks for Windows (yet)
+])
+
+export async function setUpGUComponents(
+  graalVMHome: string,
+  components: string[]
+): Promise<void> {
+  await exec('gu', ['install', '--no-progress'].concat(components))
+
+  const platformHooks = COMPONENT_TO_POST_INSTALL_HOOK.get(GRAALVM_PLATFORM)
+  if (platformHooks) {
+    for (const component of components) {
+      const postInstallHook = platformHooks.get(component)
+      if (postInstallHook) {
+        await exec(`"${join(graalVMHome, postInstallHook)}"`)
+      }
+    }
+  }
+}

src/main.ts

@@ -4,6 +4,7 @@ import * as graalvm from './graalvm'
 import {join} from 'path'
 import {mkdirP} from '@actions/io'
 import {setUpDependencies} from './dependencies'
+import {setUpGUComponents} from './gu'
 import {setUpGraalVMTrunk} from './graalvm-trunk'
 import {setUpWindowsEnvironment} from './msvc'
 
@@ -50,6 +51,15 @@ async function run(): Promise<void> {
     if (setJavaHome) {
       core.exportVariable('JAVA_HOME', graalVMHome)
     }
+
+    // Set up GraalVM components (if any)
+    if (components.length > 0) {
+      if (graalvmVersion === c.VERSION_TRUNK) {
+        // components built from source, nothing to do
+      } else {
+        await setUpGUComponents(graalVMHome, components)
+      }
+    }
   } catch (error) {
     if (error instanceof Error) core.setFailed(error.message)
   }