Created attachment 647819 [details]
Storage log

Description of problem:
I am using pyanaconda.storage as standalone storage module. On system with MD RAID device, storage.devicetree.populate fails with following traceback:

Traceback (most recent call last):
  File "anaconda_init.py", line 34, in <module>
    storage.devicetree.populate()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/devicetree.py", line 1850, in populate
    self._populate()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/devicetree.py", line 1959, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/devicetree.py", line 1062, in addUdevDevice
    device = self.addUdevMDDevice(info)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/storage/devicetree.py", line 774, in addUdevMDDevice
    "devicetree as %s" % (name, device.name))
pyanaconda.storage.errors.DeviceTreeError: MD RAID device None already in devicetree as 0

Notice 'None' as value of 'name' variable in the output. I checked sources and my udev does not provide MD_DEVNAME property, i.e. udev_device_get_md_name returns None.

Version-Release number of selected component (if applicable):
anaconda-18.28-1.fc18.x86_64
systemd-195-6.fc18.x86_64

How reproducible:
always

Steps to Reproduce:
1. prepare RAID0: mdadm --create -l 0 -n 2 /dev/md0 /dev/sda1 /dev/sdb1
2. run the program below
  
Actual results:
traceback

Expected results:
initialized storage


Reproducer script:

from pyanaconda import anaconda_log
anaconda_log.init()

import pyanaconda.storage
import pyanaconda.platform
import os

os.system('udevadm control --env=ANACONDA=1')
os.system('udevadm trigger --subsystem-match block')
os.system('udevadm settle')
platform = pyanaconda.platform.getPlatform()
storage = pyanaconda.storage.Storage(platform=platform)
storage.devicetree.populate()