Re: [Xen-devel] `xl create` can not parse `disk = ['target=/tmp/disk.img, vdev=xvdb']`

[Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>]

On 05/16/2014 10:51 AM, Ian Campbell wrote:
> On Fri, 2014-05-16 at 10:48 -0400, Zhigang Wang wrote:
>> On 05/16/2014 10:18 AM, Ian Campbell wrote:
>>> On Fri, 2014-05-16 at 10:14 -0400, Zhigang Wang wrote:
>>>> Hi,
>>>>
>>>> `xl create` cannot parse::
>>>>
>>>>     disk = ['target=/tmp/disk.img,vdev=xvdb']
>>>>
>>>> Error::
>>>>
>>>>     # xl create vm.cfg 
>>>>     Parsing config from vm.cfg
>>>>     vm.cfg: config parsing error in disk specification: no vdev specified 
>>>> in `target=/tmp/disk.img,vdev=xvdb'
>>>>
>>>> But can parse::
>>>>
>>>>     disk = ['vdev=xvdb,target=/tmp/disk.img']
>>>>
>>>> Is this a bug?
>>>
>>> No, it is expected, check the docs for the disk format strings.
>>>
>>> (User questions should go to xen-users@)
>>
>> Thanks for your answer.
>>
>> I checked: 
>> http://xenbits.xen.org/docs/4.4-testing/misc/xl-disk-configuration.txt
>>  
>> And I think here is what you referred to:
>>
>>     where each diskspec is in this form:
>>         
>>        [<key>=<value>|<flag>,]*,
>>          [<target>, [<format>, [<vdev>, [<access>]]]],
>>          [<key>=<value>|<flag>,]*
>>          [target=<target>]
>>
>> That means disk positional parameter also has orders.
> 
> Well, yes, that's what positional means.
> 
>>  I missed this point before.
> 
> More importantly you are apparently still missing:
> 
>         When this parameter is specified by name, ie with the "target="
>            syntax in the configuration file, it consumes the whole rest of the
>            <diskspec> including trailing whitespaces.  Therefore in that case
>            it must come last
> 
> Ian.

Sorry. Will read more carefully next time.

Zhigang


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