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[Launchpad Bug Tracker <1641661@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package curtin - 0.1.0~bzr437-0ubuntu1~16.04.1

---------------
curtin (0.1.0~bzr437-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * debian/new-upstream-snapshot: change to not use bzr merge-upstream.
  * New upstream snapshot.
    - pep8: fix pep8 errors found with 'make pep8' on zesty.
    - Workaround failures caused by gpg2 daemons left running in chroot.
      (LP: #1645680)
    - Install u-boot-tools when running on a system with u-boot. (LP: #1640519)
    - block: fix partition kname for raid devices  (LP: #1641661)
    - Fix up tox errors that slipped in and new pycodestyle 2.1.0 complaints.
    - vmtests: adjust vmtest image sync metadata filenames
    - vmtests: Add centos support
    - Disable WilyTestRaid5Bcache vmtest
    - tools/xkvm: fix --netdev=<bridge>
    - bytes2human: fix for values larger than 32 bit int on 32 bit python2.

 -- Scott Moser <smoser@xxxxxxxxxx>  Wed, 18 Jan 2017 12:39:01 -0500

** Changed in: curtin (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1641661

Title:
  curtin fails to partition software raid md0

Status in curtin:
  Confirmed
Status in curtin package in Ubuntu:
  Fix Released
Status in curtin source package in Xenial:
  Fix Released
Status in curtin source package in Yakkety:
  Fix Committed
Status in curtin source package in Zesty:
  Fix Released

Bug description:
  ----- Begin SRU Template -----
  [Impact]
  Curtin is unable to partition md (raid) devices.
  A system configured to put partitions on a raided device will fail to
  install.

  [Test Case]
  We added 2 test paths for this code to curtin
  a.) unit tests - these will run in the build process, so successful build
      verifies that this has passed.
  b.) vmtests named: *MirrorbootPartitions

      vmtests are currently only run on trunk, but we can modify source
      to run with the packaged version.  So, then to test the md path
      with a vm install, we will:
      i) run a xenial system
      ii) enable proposed
      iii) install curtin
      iv) run vmtests of the Mirrorboot tests using curtin from the sru.

  [Regression Potential]
  Quite low, the path for failure would be if there were some cases
  when the device name for a mdadm partition was /dev/mdNM rather than
  /dev/mdNpM.

  [Other Info]
  The upstream merge proposal is at
   https://code.launchpad.net/~raharper/curtin/trunk.lp1641661/+merge/311275
  and shows the code that went in to fix this.

  ----- End SRU Template -----

  It seem curtin has problem with software RAID partitioning: md*
  Trying to deploy node in MAAS Version 2.0.0+bzr5189-0ubuntu1 (16.04.1).
  During partitioning stage curtin returns following error:

  An error occured handling 'md0-part1': OSError - could not get path to dev from kname: md01
  finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: failed: configuring partition: md0-part1
  finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: failed: curtin command block-meta
  Traceback (most recent call last):
    File "/curtin/curtin/commands/main.py", line 211, in main
      ret = args.func(args)
    File "/curtin/curtin/commands/block_meta.py", line 62, in block_meta
      meta_custom(args)
    File "/curtin/curtin/commands/block_meta.py", line 1041, in meta_custom
      handler(command, storage_config_dict)
    File "/curtin/curtin/commands/block_meta.py", line 550, in partition_handler
      get_path_to_storage_volume(info.get('id'), storage_config),
    File "/curtin/curtin/commands/block_meta.py", line 267, in get_path_to_storage_volume
      volume_path = block.kname_to_path(partition_kname)
    File "/curtin/curtin/block/__init__.py", line 114, in kname_to_path
      raise OSError('could not get path to dev from kname: {}'.format(kname))
  OSError: could not get path to dev from kname: md01
  could not get path to dev from kname: md01
  builtin command failed
  finish: cmd-install/stage-partitioning/builtin: FAIL: failed: running 'curtin block-meta custom'
  builtin took 8.861 seconds

  I've added commit which fixes mentioned error:
  http://bazaar.launchpad.net/~ruslan-
  lutcenko/curtin/curtin/revision/431

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