This bug was fixed in the package curtin - 0.1.0~bzr425-0ubuntu1~16.04.1

---------------
curtin (0.1.0~bzr425-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  [ Scott Moser ]
  * debian/new-upstream-snapshot: add writing of debian changelog entries.

  [ Ryan Harper ]
  * New upstream snapshot.
    - unittest,tox.ini: catch and fix issue with trusty-level mock of open
    - block/mdadm: add option to ignore mdadm_assemble errors  (LP: #1618429)
    - curtin/doc: overhaul curtin documentation for readthedocs.org
      (LP: #1351085)
    - curtin.util: re-add support for RunInChroot  (LP: #1617375)
    - curtin/net: overhaul of eni rendering to handle mixed ipv4/ipv6 configs
    - curtin.block: refactor clear_holders logic into block.clear_holders and
      cli cmd
    - curtin.apply_net should exit non-zero upon exception.  (LP: #1615780)
    - apt: fix bug in disable_suites if sources.list line is blank.
    - vmtests: disable Wily in vmtests
    - Fix the unittests for test_apt_source.
    - get CURTIN_VMTEST_PARALLEL shown correctly in jenkins-runner output
    - fix vmtest check_file_strippedline to strip lines before comparing
    - fix whitespace damage in tests/vmtests/__init__.py
    - fix dpkg-reconfigure when debconf_selections was provided.
      (LP: #1609614)
    - fix apt tests on non-intel arch
    - Add apt features to curtin.  (LP: #1574113)
    - vmtest: easier use of parallel and controlling timeouts
    - mkfs.vfat: add force flag for formating whole disks  (LP: #1597923)
    - block.mkfs: fix sectorsize flag  (LP: #1597522)
    - block_meta: cleanup use of sys_block_path and handle cciss knames
      (LP: #1562249)
    - block.get_blockdev_sector_size: handle _lsblock multi result return
      (LP: #1598310)
    - util: add target (chroot) support to subp, add target_path helper.
    - block_meta: fallback to parted if blkid does not produce output
      (LP: #1524031)
    - commands.block_wipe:  correct default wipe mode to 'superblock'
    - tox.ini: run coverage normally rather than separately
    - move uefi boot knowledge from launch and vmtest to xkvm

 -- Ryan Harper <ryan.har...@canonical.com>  Mon, 03 Oct 2016 13:43:54
-0500

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

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https://bugs.launchpad.net/bugs/1524031

Title:
  attempting to preserve disk curtin expects PTTYPE in blkid output

Status in curtin:
  Fix Committed
Status in curtin package in Ubuntu:
  Fix Released
Status in curtin source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * On a Trusty host, if users enable storage disk preserve feature,
     the use of blkid expects PTTYPE value in the output, however, this is
     not present in Trusty blkid output.  This prevents Trusty hosts from
     preserving existing partitions.

     Curtin has been updated to fallback to using parted to determine how to
     preserve existing partitions on disks when directed.
     
  [Test Case]

   * Install proposed curtin package and deploy in a Trusty ephemeral
     environment with the following storage configuration:

     storage:
      version: 1
      config:
        - id: vdg
          model: Unknown Model
          preserve: true
          ptable: gpt
          serial: 64bddb21-61f3-4869-8
          type: disk
          wipe: superblock

    PASS: Successfully deploy image while preserving the original partition
          table.

    FAIL: Deployment fails with the following error:

        line 530, in disk_handler
                out.splitlines()))[0].split("=")[-1]
        IndexError: list index out of range
        list index out of range

  
  [Regression Potential]

   * No known other failures when using parted as replacement for blkid
     partition data.


  [Original Description]
  On a trusty host, this storage configuration breaks:

  storage:
    version: 1
    config:
      - id: vdg
        model: Unknown Model
        preserve: true
        ptable: gpt
        serial: 64bddb21-61f3-4869-8
        type: disk
        wipe: superblock

  like this:

  Running command ['partprobe', '/dev/vdg'] with allowed return codes [0, 1] 
(shell=False, capture=False)
  Running command ['udevadm', 'settle'] with allowed return codes [0] 
(shell=False, capture=False)
  Running command ['blkid', '-o', 'export', '/dev/vdg'] with allowed return 
codes [0] (shell=False, capture=True)
  An error occured handling 'vdg': IndexError - list index out of range
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/curtin/commands/main.py", line 208, in 
main
      ret = args.func(args)
    File "/usr/lib/python3/dist-packages/curtin/commands/block_meta.py", line 
63, in block_meta
      meta_custom(args)
    File "/usr/lib/python3/dist-packages/curtin/commands/block_meta.py", line 
1208, in meta_custom
      handler(command, storage_config_dict)
    File "/usr/lib/python3/dist-packages/curtin/commands/block_meta.py", line 
530, in disk_handler
      out.splitlines()))[0].split("=")[-1]
  IndexError: list index out of range
  list index out of range

  From this code here:

          # Check state of current ptable
          try:
              (out, _err) = util.subp(["blkid", "-o", "export", disk],
                                      capture=True)
          except util.ProcessExecutionError:
              raise ValueError("disk '%s' has no readable partition table or \
                  cannot be accessed, but preserve is set to true, so cannot \
                  continue")
          current_ptable = list(filter(lambda x: "PTTYPE" in x,
                                       out.splitlines()))[0].split("=")[-1]

  And the output of blkid -o export /dev/vdg on trusty instance is:

  # blkid -o export /dev/vdg
  UUID=ef30955b-8aa0-453f-a37d-d631a09a6f7c
  UUID_SUB=9a21ae23-6f14-405d-9e9a-8955855132d5
  TYPE=btrfs

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