soooo...

turns out ALL of the disk operations can be performed with
gobject-introspection.

BUT it's unlikely that that'll be available everywhere, or that
the Arch Linux releng team would include it, etc.
So we have fallbacks to mimic it.

BUT please try to use gobject-introspection with libblockdev,
because it's going to be a lot faster and a lot less error-prone.

aif/disk/lvm.py

@@ -1,29 +1,3 @@
-try:
-    import dbus
-    has_mod = True
-except ImportError:
-    # This is ineffecient; the native dbus module is preferred.
-    # In Arch, this can be installed via the 'extra' repository package "python-dbus".
-    import subprocess
-    has_mod = False
-##
-import aif.disk.block
-import aif.disk.luks
-import aif.disk.mdadm
+from . import _common
 
-
-class PV(object):
-    def __init__(self, partobj):
-        self.devpath = None
-        pass
-
-
-class VG(object):
-    def __init__(self, vg_xml, lv_objs):
-        self.devpath = None
-        pass
-
-
-class LV(object):
-    def __init__(self, lv_xml, pv_objs):
-        pass
+BlockDev = _common.BlockDev