parted use not well tested

[aeva black]

PXE driver is now using parted for creating the partition table, and parted can be run against a flat file as though it were a disk, so we should test some edge cases:

- the cross product of 0, 1, 5 (in whatever unit) for each of (swap, root, ephemeral)
- corner case for sum(swap, root, ephemeral) = reported size of disk
- partitioning a disk with a bad but non-null partition table
- partition a disk, don't erase the partition table, and just partition it again with a differently sized root partition

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/94620

[Dmitry Tantsur (divius)]

@devananda, what did you mean by "bad" in "partitioning a disk with a bad but non-null partition table"?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/94620
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=fc7dfcc543d2517746c66927536ef78846f45b26
Submitter: Jenkins
Branch: master

commit fc7dfcc543d2517746c66927536ef78846f45b26
Author: Dmitry Tantsur <email address hidden>
Date: Wed May 21 15:46:05 2014 +0200

    Add some real-world testing on DiskPartitioner

    This patch adds some integration tests for DiskPartitioner by using
    it on a temporary file. As a side effect, this patch adds
    disk_partitioner.list_partitions() helper, which is used by the test,
    but can by used for anything else later.

    The new tests are currently skipped on gate-ironic-python26, as
    there is no `parted` utility there.
    Also these tests do not cover destroy_disk_metadata, as it can't
    be executed on a file.

    Change-Id: I53bf2d207b7d15a0673be6a6786c47500b9eb499
    Closes-Bug: #1306153