Merge remote-tracking branch 'origin/pr/299'

* origin/pr/299:
  add tests
  fix QubesOS/qubes-issues/issues/9354

qubesadmin/tests/tools/qvm_device.py

@@ -86,26 +86,40 @@ def test_001_list_assigned_required(self):
         # This shouldn't be listed
         self.expected_device_call(
             'test-vm2', 'Available',
-            b"0\0dev2 ident='dev1' devclass='testclass' backend_domain='test-vm2'\n")
-        self.expected_device_call('test-vm3', 'Available')
+            b"0\0dev2 ident='dev2' devclass='testclass' backend_domain='test-vm2'\n")
+        self.expected_device_call(
+            'test-vm3', 'Available',
+            b"0\0dev3 ident='dev3' devclass='testclass' backend_domain='test-vm3' vendor='evil inc.' product='test-device-3'\n"
+        )
         self.expected_device_call('test-vm1', 'Attached')
         self.expected_device_call('test-vm2', 'Attached')
         self.expected_device_call('test-vm3', 'Attached')
         self.expected_device_call('test-vm1', 'Assigned')
-        self.expected_device_call('test-vm2', 'Assigned')
         self.expected_device_call(
-            'test-vm3', 'Assigned',
+            'test-vm2', 'Assigned',
             b"0\0test-vm1+dev1 ident='dev1' devclass='testclass' "
             b"backend_domain='test-vm1' attach_automatically='yes' "
+            b"required='yes' _option='other option' _extra_opt='yes'\n"
+            b"test-vm3+dev3 ident='dev3' devclass='testclass' "
+            b"backend_domain='test-vm3' attach_automatically='yes' "
             b"required='yes'\n"
         )
+        self.expected_device_call(
+            'test-vm3', 'Assigned',
+            b"0\0test-vm1+dev1 ident='dev1' devclass='testclass' "
+            b"backend_domain='test-vm1' attach_automatically='yes' "
+            b"required='yes' _option='test option'\n"
+        )
 
         with qubesadmin.tests.tools.StdoutBuffer() as buf:
             qubesadmin.tools.qvm_device.main(
                 ['testclass', 'list', 'test-vm3'], app=self.app)
             self.assertEqual(
                 buf.getvalue(),
-                'test-vm1:dev1  ?******: itl test-device  test-vm3\n'
+                'test-vm1:dev1  ?******: itl test-device          '
+                'test-vm2 (option=other option, extra_opt=yes), '
+                'test-vm3 (option=test option)\n'
+                'test-vm3:dev3  ?******: evil inc. test-device-3  test-vm2\n'
             )
 
     def test_002_list_attach(self):

qubesadmin/tools/qvm_device.py

@@ -91,8 +91,7 @@ def list_devices(args):
     for dev in result:
         for vm in app.domains:
             frontends = _load_frontends_info(vm, dev, args.devclass)
-            if frontends is not None:
-                result[dev].frontends.append(frontends)
+            result[dev].frontends.extend(frontends)
 
     qubesadmin.tools.print_table(prepare_table(result.values()))
 
@@ -132,19 +131,20 @@ def _load_frontends_info(vm, dev, devclass):
     Returns string of vms to which a device is connected or `None`.
     """
     if vm == dev.backend_domain:
-        return None
+        return
 
     try:
         for assignment in vm.devices[devclass].get_dedicated_devices():
             if dev != assignment:
-                return None
+                continue
             if assignment.options:
-                return '{!s} ({})'.format(
+                yield '{!s} ({})'.format(
                     vm, ', '.join('{}={}'.format(key, value)
                     for key, value in assignment.options.items()))
-            return str(vm)
+            else:
+                yield str(vm)
     except qubesadmin.exc.QubesVMNotFoundError:
-        return None
+        pass
 
 
 def attach_device(args):