Support running on linux without hardware accleration.

src/emulator-manager.ts

@@ -17,6 +17,12 @@ export async function launchEmulator(apiLevel: number, target: string, arch: str
 
   // start emulator
   console.log('Starting emulator.');
+
+  // turn off hardware acceleration on Linux
+  if (process.platform === 'linux') {
+    emulatorOptions += ' -accel off';
+  }
+
   await exec.exec(`sh -c \\"${process.env.ANDROID_HOME}/emulator/emulator -avd test ${emulatorOptions} &"`, [], {
     listeners: {
       stderr: (data: Buffer) => {

src/main.ts

@@ -7,9 +7,15 @@ import { parseScript } from './script-parser';
 
 async function run() {
   try {
-    // only support running on macOS
+    // only support running on macOS or Linux
     if (process.platform !== 'darwin') {
-      throw new Error('This action is expected to be run within a macOS virtual machine to enable hardware acceleration.');
+      if (process.platform === 'linux') {
+        console.warn(
+          `You're running a Linux VM where hardware acceleration is not available. Please consider using a macOS VM instead to take advantage of native hardware acceleration support provided by HAXM.`
+        );
+      } else {
+        throw new Error('Unsupported virtual machine: please use either macos or ubuntu VM.');
+      }
     }
 
     // API level of the platform and system image
@@ -68,12 +74,8 @@ async function run() {
     // install SDK
     await installAndroidSdk(apiLevel, target, arch, emulatorBuild);
 
-    try {
-      // launch an emulator
-      await launchEmulator(apiLevel, target, arch, profile, emulatorOptions, disableAnimations);
-    } catch (error) {
-      core.setFailed(error.message);
-    }
+    // launch an emulator
+    await launchEmulator(apiLevel, target, arch, profile, emulatorOptions, disableAnimations);
 
     // execute the custom script
     try {

src/sdk-installer.ts

@@ -2,30 +2,35 @@ import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 
 const BUILD_TOOLS_VERSION = '29.0.3';
-const CMDLINE_TOOLS_URL = 'https://dl.google.com/android/repository/commandlinetools-linux-6200805_latest.zip';
+const CMDLINE_TOOLS_URL_MAC = 'https://dl.google.com/android/repository/commandlinetools-linux-6200805_latest.zip';
+const CMDLINE_TOOLS_URL_LINUX = 'https://dl.google.com/android/repository/commandlinetools-linux-6200805_latest.zip';
 
 /**
  * Installs & updates the Android SDK for the macOS platform, including SDK platform for the chosen API level, latest build tools, platform tools, Android Emulator,
  * and the system image for the chosen API level, CPU arch, and target.
  */
 export async function installAndroidSdk(apiLevel: number, target: string, arch: string, emulatorBuild?: string): Promise<void> {
+  const isOnMac = process.platform === 'darwin';
   console.log('Installing new cmdline-tools.');
-  await exec.exec(`mkdir ${process.env.ANDROID_HOME}/cmdline-tools`);
-  await exec.exec(`curl -fo commandlinetools.zip ${CMDLINE_TOOLS_URL}`);
-  await exec.exec(`unzip -q commandlinetools.zip -d ${process.env.ANDROID_HOME}/cmdline-tools`);
-  await exec.exec(`rm -f commandlinetools.zip`);
+  const sdkUrl = isOnMac ? CMDLINE_TOOLS_URL_MAC : CMDLINE_TOOLS_URL_LINUX;
+  await exec.exec(`sudo mkdir ${process.env.ANDROID_HOME}/cmdline-tools`);
+  await exec.exec(`curl -fo commandlinetools.zip ${sdkUrl}`);
+  await exec.exec(`sudo unzip -q commandlinetools.zip -d ${process.env.ANDROID_HOME}/cmdline-tools`);
+  await exec.exec(`sudo rm -f commandlinetools.zip`);
 
   // add paths for commandline-tools and platform-tools
   core.addPath(`${process.env.ANDROID_HOME}/cmdline-tools/tools:${process.env.ANDROID_HOME}/cmdline-tools/tools/bin:${process.env.ANDROID_HOME}/platform-tools`);
+  await exec.exec(`sh -c \\"sudo chmod -R 777 ${process.env.ANDROID_HOME}"`);
 
   console.log('Installing latest build tools, platform tools, and platform.');
+
   await exec.exec(`sh -c \\"sdkmanager --install 'build-tools;${BUILD_TOOLS_VERSION}' platform-tools 'platforms;android-${apiLevel}' > /dev/null"`);
   if (emulatorBuild) {
     console.log(`Installing emulator build ${emulatorBuild}.`);
-    await exec.exec(`curl -fo emulator.zip https://dl.google.com/android/repository/emulator-darwin-${emulatorBuild}.zip`);
-    await exec.exec(`rm -rf ${process.env.ANDROID_HOME}/emulator`);
-    await exec.exec(`unzip -q emulator.zip -d ${process.env.ANDROID_HOME}`);
-    await exec.exec(`rm -f emulator.zip`);
+    await exec.exec(`curl -fo emulator.zip https://dl.google.com/android/repository/emulator-${isOnMac ? 'darwin' : 'linux'}-${emulatorBuild}.zip`);
+    await exec.exec(`sudo rm -rf ${process.env.ANDROID_HOME}/emulator`);
+    await exec.exec(`sudo unzip -q emulator.zip -d ${process.env.ANDROID_HOME}`);
+    await exec.exec(`sudo rm -f emulator.zip`);
   } else {
     console.log('Installing latest emulator.');
     await exec.exec(`sh -c \\"sdkmanager --install emulator > /dev/null"`);