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[Qemu-devel] Re: qemu-img help missing backing file


From: Juan Quintela
Subject: [Qemu-devel] Re: qemu-img help missing backing file
Date: Tue, 30 Mar 2010 15:04:24 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Kevin Wolf <address@hidden> wrote:
> Am 30.03.2010 14:32, schrieb Alexander Graf:
>> 
>> On 30.03.2010, at 14:30, Kevin Wolf wrote:
>> 
>>> Am 30.03.2010 14:22, schrieb Alexander Graf:
>>>> Howdy,
>>>>
>>>> I just wanted to create a backed qcow2 image and was irritated by qemu-img 
>>>> not showing me the correct command line option. It's just missing from the 
>>>> list:
>>> [...]
>>>> Is this intentional? The actual command still works:
>>>>
>>>>> address@hidden:~/git/qemu> qemu-img-kvm create -f qcow2 -b 
>>>>> /media/studio/images/SUSE/s390/sles11.raw /dev/shm/sles11-zipl.qcow2
>>>>> Formatting '/dev/shm/sles11-zipl.qcow2', fmt=qcow2 size=21474836480 
>>>>> backing_file='/media/studio/images/SUSE/s390/sles11.raw' encryption=off 
>>>>> cluster_size=0 
>>>
>>> -b still works to maintain compatibility with older versions. The
>>> documented way is -o backing_file=foo (the qemu-img output you quote
>>> even contains this option).
>> 
>> Interesting O_o. Maybe it'd be a good idea to give some examples in the help 
>> output? The same way the -e and -b options were having examples there too. 
>> That really makes them easier to find.
>
> Feel free to submit a patch. ;-)
>
> Examples sound like an easy way to make these features more visible
> again. Even better, but a bit more work, would be to include a
> dynamically generated list of all supported options like this:
>
> backing_file: File name of a base image (qcow, qcow2, vmdk)
> backing_fmt:  Image format of the base image (qcow2)
> encryption:   Encrypt the image (qcow, qcow2)

You can look at how this was done for -cpu

you do -cpu ?model

and it list the models.

Later, Juan.




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