Public bug reported:
at some point recently, qemu-nbd (and qemu also) started complaining
about raw devices.
qemu-nbd will actually refuse to connect and exit failure unless you
specify --format if it does not detect the format.
the end result is that on wily right now:
mount-image-callback partititioned-disk-image.raw /bin/bash
will fail.
Additionally, because of the way it fails, it actually never disconnects
from the device.
It looks like this:
$ sudo mount-image-callback -vvv /tmp/disk.img -- /bin/bash
WARNING: Image format was not specified for '/tmp/disk.img' and probing guessed
raw.
Automatically detecting the format is dangerous for raw images, write
operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
failed to qemu-nbd connect /tmp/disk.img to /dev/nbd0
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: cloud-image-utils 0.27-0ubuntu18
ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
Uname: Linux 4.1.0-3-generic x86_64
ApportVersion: 2.18-0ubuntu9
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Sep 4 12:32:24 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-07-23 (43 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
PackageArchitecture: all
SourcePackage: cloud-utils
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: cloud-utils (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug wily
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https://bugs.launchpad.net/bugs/1492386
Title:
mount-image-callback: must specify format to qemu-nbd
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