storage: modernize super() syntax

qubes/storage/__init__.py

@@ -99,7 +99,7 @@ class Volume:
 
         '''
 
-        super(Volume, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         assert isinstance(pool, Pool)
         assert source is None or (isinstance(source, Volume)
                                   and source.pool == pool)
@@ -717,7 +717,7 @@ class Pool:
     root_img_size = qubes.config.defaults['root_img_size']
 
     def __init__(self, name, revisions_to_keep=1, **kwargs):
-        super(Pool, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         self._volumes_collection = VolumesCollection(self)
         self.name = name
         self.revisions_to_keep = revisions_to_keep

qubes/storage/file.py

@@ -53,8 +53,7 @@ class FilePool(qubes.storage.Pool):
     driver = 'file'
 
     def __init__(self, revisions_to_keep=1, dir_path=None, **kwargs):
-        super(FilePool, self).__init__(revisions_to_keep=revisions_to_keep,
-                                       **kwargs)
+        super().__init__(revisions_to_keep=revisions_to_keep, **kwargs)
         assert dir_path, "No pool dir_path specified"
         self.dir_path = os.path.normpath(dir_path)
         self._volumes = []
@@ -182,7 +181,7 @@ class FileVolume(qubes.storage.Volume):
         self.dir_path = dir_path
         assert self.dir_path, "dir_path not specified"
         self._revisions_to_keep = 0
-        super(FileVolume, self).__init__(**kwargs)
+        super().__init__(**kwargs)
 
         if self.snap_on_start:
             img_name = self.source.vid + '-cow.img'

qubes/storage/kernels.py

@@ -33,7 +33,7 @@ class LinuxModules(Volume):
 
     def __init__(self, target_dir, kernel_version, **kwargs):
         kwargs['vid'] = ''
-        super(LinuxModules, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         self._kernel_version = kernel_version
         self.target_dir = target_dir
         assert self.revisions_to_keep == 0
@@ -156,7 +156,7 @@ class LinuxKernel(Pool):
 
     def __init__(self, name=None, dir_path=None):
         assert dir_path, 'Missing dir_path'
-        super(LinuxKernel, self).__init__(name=name, revisions_to_keep=0)
+        super().__init__(name=name, revisions_to_keep=0)
         self.dir_path = dir_path
 
     def init_volume(self, vm, volume_config):

qubes/storage/lvm.py

@@ -81,8 +81,7 @@ class ThinPool(qubes.storage.Pool):
     driver = 'lvm_thin'
 
     def __init__(self, volume_group, thin_pool, revisions_to_keep=1, **kwargs):
-        super(ThinPool, self).__init__(revisions_to_keep=revisions_to_keep,
-                                       **kwargs)
+        super().__init__(revisions_to_keep=revisions_to_keep, **kwargs)
         self.volume_group = volume_group
         self.thin_pool = thin_pool
         self._pool_id = "{!s}/{!s}".format(volume_group, thin_pool)
@@ -316,7 +315,7 @@ class ThinVolume(qubes.storage.Volume):
 
     def __init__(self, volume_group, **kwargs):
         self.volume_group = volume_group
-        super(ThinVolume, self).__init__(**kwargs)
+        super().__init__(**kwargs)
         self.log = logging.getLogger('qubes.storage.lvm.%s' % str(self.pool))
 
         if self.snap_on_start or self.save_on_stop:
@@ -742,7 +741,7 @@ class ThinVolume(qubes.storage.Volume):
                 '/dev/' + self._vid_snap, self.name, self.script,
                 self.rw, self.domain, self.devtype)
 
-        return super(ThinVolume, self).block_device()
+        return super().block_device()
 
     @property
     def usage(self):  # lvm thin usage always returns at least the same usage as