new_contents: import os
  
  import blivet
  from blivet.size import Size
  from blivet.util import set_up_logging, create_sparse_tempfile
  
  set_up_logging()
  b = blivet.Blivet()   # create an instance of Blivet (don't add system devices)
  
  # create a disk image file on which to create new devices
  disk1_file = create_sparse_tempfile("disk1", Size("100GiB"))
  b.disk_images["disk1"] = disk1_file
  disk2_file = create_sparse_tempfile("disk2", Size("100GiB"))
  b.disk_images["disk2"] = disk2_file
  
  b.reset()
  
  try:
      disk1 = b.devicetree.get_device_by_name("disk1")
      disk2 = b.devicetree.get_device_by_name("disk2")
  
      b.initialize_disk(disk1)
      b.initialize_disk(disk2)
  
      pv = b.new_partition(size=Size("50GiB"), fmt_type="lvmpv", parents=[disk1])
      b.create_device(pv)
      pv2 = b.new_partition(size=Size("50GiB"), fmt_type="lvmpv", parents=[disk2])
      b.create_device(pv2)
  
      # allocate the partitions (decide where and on which disks they'll reside)
      blivet.partitioning.do_partitioning(b)
  
      vg = b.new_vg(parents=[pv, pv2])
      b.create_device(vg)
  
      # create 80 GiB VDO pool
      # there can be only one VDO LV on the pool and these are created together
      # with one LVM call, we have 2 separate devices because there are two block
      # devices in the end and it allows to control the different "physical" size of
      # the pool and "logical" size of the VDO LV (which is usually bigger, accounting
      # for the saved space with deduplication and/or compression)
      pool = b.new_lv(size=Size("80GiB"), parents=[vg], name="vdopool", vdo_pool=True,
                      deduplication=True, compression=True)
      b.create_device(pool)
  
      # create the VDO LV with 400 GiB "virtual size" and ext4 filesystem on the VDO
      # pool
      lv = b.new_lv(size=Size("400GiB"), parents=[pool], name="vdolv", vdo_lv=True,
                    fmt_type="ext4")
      b.create_device(lv)
  
      print(b.devicetree)
  
      # write the new partitions to disk and format them as specified
      b.do_it()
      print(b.devicetree)
      input("Check the state and hit ENTER to trigger cleanup")
  finally:
      b.devicetree.teardown_disk_images()
      os.unlink(disk1_file)
      os.unlink(disk2_file)
  
subject: Add LVM VDO example