add simple ios device check; decouple from android checks

agent/config.sample.yaml

@@ -32,3 +32,9 @@ auth_token: blahblahblah
 # Contact [email protected], [email protected] or [email protected] to
 # get a Firebase token.
 firebase_flutter_dashboard_token: blahblahblah
+
+# Whether the device tests on Android (true by default)
+tests_android: true
+
+# Whether the device tests on iOS (false by default)
+tests_ios: false

agent/lib/src/commands/ci.dart

@@ -106,16 +106,31 @@ class ContinuousIntegrationCommand extends Command {
     try {
       results['firebase-connection'] = await checkFirebaseConnection();
 
-      Map<String, HealthCheckResult> deviceChecks = await Adb.checkDevices();
-      results.addAll(deviceChecks);
+      if (config.testsIos) {
+        String deviceIds = await eval('ideviceinfo', <String>['-k', 'DeviceClass'], canFail: true);
+        results['has-healthy-ios-devices'] = deviceIds.contains('iPhone')
+          ? new HealthCheckResult.success('Found an iPhone')
+          : new HealthCheckResult.failure(
+            'This agent is configured to test on iOS devices. However, no '
+            'attached iOS devices were found.',
+          );
+      }
+
+      if (config.testsAndroid) {
+        Map<String, HealthCheckResult> deviceChecks = await Adb.checkDevices();
+        results.addAll(deviceChecks);
 
-      int healthyDeviceCount = deviceChecks.values
-        .where((HealthCheckResult r) => r.succeeded)
-        .length;
+        int healthyDeviceCount = deviceChecks.values
+          .where((HealthCheckResult r) => r.succeeded)
+          .length;
 
-      results['has-healthy-devices'] = healthyDeviceCount > 0
-        ? new HealthCheckResult.success('Found ${deviceChecks.length} healthy devices')
-        : new HealthCheckResult.failure('No healthy devices found');
+        results['has-healthy-android-devices'] = healthyDeviceCount > 0
+          ? new HealthCheckResult.success('Found ${deviceChecks.length} healthy devices')
+          : new HealthCheckResult.failure(
+            'This agent is configured to test on Android devices. However, no '
+            'attached Android devices were found.',
+          );
+      }
 
       try {
         String authStatus = await agent.getAuthenticationStatus();

agent/lib/src/utils.dart

@@ -269,12 +269,14 @@ void cd(dynamic directory) {
 
 class Config {
   Config({
-    this.baseCocoonUrl,
-    this.agentId,
-    this.firebaseFlutterDashboardToken,
-    this.authToken,
-    this.flutterDirectory,
-    this.runTaskFile
+    @required this.baseCocoonUrl,
+    @required this.agentId,
+    @required this.firebaseFlutterDashboardToken,
+    @required this.authToken,
+    @required this.flutterDirectory,
+    @required this.runTaskFile,
+    @required this.testsAndroid,
+    @required this.testsIos,
   });
 
   static void initialize(ArgResults args) {
@@ -304,7 +306,9 @@ class Config {
       firebaseFlutterDashboardToken: firebaseFlutterDashboardToken,
       authToken: authToken,
       flutterDirectory: flutterDirectory,
-      runTaskFile: runTaskFile
+      runTaskFile: runTaskFile,
+      testsAndroid: agentConfig['tests_android'] ?? true,
+      testsIos: agentConfig['tests_ios'] ?? false,
     );
   }
 
@@ -314,6 +318,8 @@ class Config {
   final String authToken;
   final Directory flutterDirectory;
   final File runTaskFile;
+  final bool testsAndroid;
+  final bool testsIos;
 
   String get adbPath {
     String androidHome = Platform.environment['ANDROID_HOME'];
@@ -338,6 +344,8 @@ agentId: $agentId
 flutterDirectory: $flutterDirectory
 runTaskFile: $runTaskFile
 adbPath: $adbPath
+testsAndroid: $testsAndroid
+testsIos: $testsIos
 '''.trim();
 }