when creating a partition of type fat, don't specify label

[Amrith Kumar]

When making an ext[234] partition, you can specify a volume label on the command line to mkfs with the -L option. This is however not a part of the options of mkfs; only of mke2fs [see man 8 mke2fs].

mkfs.fat provides no such thing [see man 8 mkfs.fat]

As a result, when creating a partition of type fat, I get the following failure in dib (see attach.txt, attached).

Here's the quick test of the failing command

$ sudo mkfs -t fat -L mkfs_boot /dev/mapper/loop0p5
mkfs.fat 3.0.28 (2015-05-16)
mkfs.fat: invalid option -- 'L'
Unknown option: ?
Usage: mkfs.fat [-a][-A][-c][-C][-v][-I][-l bad-block-file][-b backup-boot-sector]
       [-m boot-msg-file][-n volume-name][-i volume-id]
       [-s sectors-per-cluster][-S logical-sector-size][-f number-of-FATs]
       [-h hidden-sectors][-F fat-size][-r root-dir-entries][-R reserved-sectors]
       [-M FAT-media-byte][-D drive_number]
       [--invariant]
       [--help]
       /dev/name [blocks]

[Amrith Kumar (amrith)]

the correct option for fat and vfat is -n, the fix is trivial, I'll push it up shortly.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/481787

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/481787
Committed: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=59f416ae2082b026497d3b46cc805e3906553cec
Submitter: Jenkins
Branch: master

commit 59f416ae2082b026497d3b46cc805e3906553cec
Author: Amrith Kumar <email address hidden>
Date: Fri Jul 7 22:26:48 2017 -0400

    The correct option for label name in fat and vfat is '-n'

    The code in mkfs correctly extends the command line with a '-n' for
    vfat but does not currently do it for fat. This means that mkfs for
    fat ends up with a '-L' which is what you'd do for everything like
    ext[234].

    The change just treats fat like vfat in the one place where this check
    is required.

    Change-Id: If65dfd949acdadff33a564640fb42ea73026a786
    Closes-Bug: #1703063