Raise useful exception msg if file invalid.

ipa/ipa_gce.py

@@ -133,8 +133,21 @@ def _get_service_account_info(self):
         with open(self.service_account_file, 'r') as f:
             info = json.load(f)
 
-        self.service_account_email = info['client_email']
-        self.service_account_project = info['project_id']
+        self.service_account_email = info.get('client_email')
+        if not self.service_account_email:
+            raise GCEProviderException(
+                'Service account JSON file is invalid for GCE. '
+                'client_email key is expected. See getting started '
+                'docs for information on GCE configuration.'
+            )
+
+        self.service_account_project = info.get('project_id')
+        if not self.service_account_project:
+            raise GCEProviderException(
+                'Service account JSON file is invalid for GCE. '
+                'project_id key is expected. See getting started '
+                'docs for information on GCE configuration.'
+            )
 
     def _get_driver(self):
         """Get authenticated GCE driver."""

tests/gce/invalid-service-account.json

@@ -0,0 +1,11 @@
+{
+  "type": "service_account",
+  "project_id": "test",
+  "private_key_id": "1111",
+  "private_key": "",
+  "client_id": "1111",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "https://accounts.google.com/o/oauth2/token",
+  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/test%40test.iam.gserviceaccount.com"
+}

tests/test_ipa_gce.py

@@ -85,6 +85,29 @@ def test_gce_get_service_account_info(self,
             '[email protected]'
         assert provider.service_account_project == 'test'
 
+    @patch.object(GCEProvider, '_get_ssh_public_key')
+    @patch.object(GCEProvider, '_get_driver')
+    def test_gce_get_service_account_info_invalid(
+        self,
+        mock_get_driver,
+        mock_get_ssh_key
+    ):
+        """Test get service account info method."""
+        mock_get_driver.return_value = None
+        mock_get_ssh_key.return_value = None
+        provider = GCEProvider(**self.kwargs)
+
+        provider.service_account_file = \
+            'tests/gce/invalid-service-account.json'
+
+        with pytest.raises(GCEProviderException) as error:
+            provider._get_service_account_info()
+
+        msg = 'Service account JSON file is invalid for GCE. ' \
+            'client_email key is expected. See getting started ' \
+            'docs for information on GCE configuration.'
+        assert str(error.value) == msg
+
     @patch.object(GCEProvider, '_get_ssh_public_key')
     @patch('libcloud.compute.drivers.gce.GCENodeDriver')
     def test_gce_get_driver(self,