3:40 a.m.
(More of a note to self to investigate)
$ qemu-img create -f luks --object secret,data=LETMEPASS,id=sec0 -o key-secret=sec0
encrypted.img 100M
Formatting 'encrypted.img', fmt=luks size=104857600 key-secret=sec0
$ rm -f data.img
$ truncate -s 100M data.img
$ nbdkit file encrypted.img --filter=luks passphrase=LETMEPASS --run 'nbdcopy data.img
$nbd'
nbdkit: backend.c:718: backend_zero: Assertion `c->can_zero > NBDKIT_ZERO_NONE'
failed.
write at offset 0 failed: Transport endpoint is not connected
nbdkit: nbdkit command was killed by signal 6
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines. Boot with a
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http://libguestfs.org/virt-v2v
6:47 a.m.
On Fri, Jun 10, 2022 at 09:40:48AM +0100, Richard W.M. Jones wrote:
(More of a note to self to investigate)
$ qemu-img create -f luks --object secret,data=LETMEPASS,id=sec0 -o key-secret=sec0
encrypted.img 100M
Formatting 'encrypted.img', fmt=luks size=104857600 key-secret=sec0
$ rm -f data.img
$ truncate -s 100M data.img
$ nbdkit file encrypted.img --filter=luks passphrase=LETMEPASS --run 'nbdcopy
data.img $nbd'
nbdkit: backend.c:718: backend_zero: Assertion `c->can_zero > NBDKIT_ZERO_NONE'
failed.
write at offset 0 failed: Transport endpoint is not connected
nbdkit: nbdkit command was killed by signal 6
It's a bug in server/backend.c:backend_zero() for not checking and
handling ZERO_EMULATE by calling into pwrite instead. I'll fix it
shortly. (I seem to recall that I had ZERO_EMULATE working when I
first introduced it; I'll have to check git history and see if a
refactoring accidentally lost it...)
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
7:01 a.m.
On Fri, Jun 10, 2022 at 06:47:44AM -0500, Eric Blake wrote:
On Fri, Jun 10, 2022 at 09:40:48AM +0100, Richard W.M. Jones wrote:
>
> (More of a note to self to investigate)
>
> $ qemu-img create -f luks --object secret,data=LETMEPASS,id=sec0 -o key-secret=sec0
encrypted.img 100M
> Formatting 'encrypted.img', fmt=luks size=104857600 key-secret=sec0
> $ rm -f data.img
> $ truncate -s 100M data.img
> $ nbdkit file encrypted.img --filter=luks passphrase=LETMEPASS --run 'nbdcopy
data.img $nbd'
> nbdkit: backend.c:718: backend_zero: Assertion `c->can_zero >
NBDKIT_ZERO_NONE' failed.
> write at offset 0 failed: Transport endpoint is not connected
> nbdkit: nbdkit command was killed by signal 6
It's a bug in server/backend.c:backend_zero() for not checking and
handling ZERO_EMULATE by calling into pwrite instead. I'll fix it
shortly. (I seem to recall that I had ZERO_EMULATE working when I
first introduced it; I'll have to check git history and see if a
refactoring accidentally lost it...)
I think so too (see patch I posted, which I withdraw).
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html
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