Don't throw when we fail to find a device.

Instead, set it to None and let the caller handle things.

Change-Id: Ic4f27fdb52ebd6bc5b4048e4e688ec7bd2509bfa

python-packages/gdbrunner/__init__.py

@@ -63,6 +63,7 @@ class ArgumentParser(argparse.ArgumentParser):
                 msg += "\n       Try specifying its location with --adb."
             sys.exit(msg.format(adb_path))
 
+        try:
             if result.device == "-a":
                 result.device = adb.get_device(adb_path=adb_path)
             elif result.device == "-d":
@@ -71,6 +72,9 @@ class ArgumentParser(argparse.ArgumentParser):
                 result.device = adb.get_emulator_device(adb_path=adb_path)
             else:
                 result.device = adb.get_device(result.serial, adb_path=adb_path)
+        except (adb.DeviceNotFoundError, adb.NoUniqueDeviceError, RuntimeError):
+            # Don't error out if we can't find a device.
+            result.device = None
 
         return result
 

scripts/gdbclient.py

@@ -210,6 +210,10 @@ end
 def main():
     args = parse_args()
     device = args.device
+
+    if device is None:
+        sys.exit("ERROR: Failed to find device.")
+
     props = device.get_props()
 
     root = os.environ["ANDROID_BUILD_TOP"]