Re: block-nbd script and example config

[Arnd Schmitter <arnd_xen@yahoo.de>]

Anthony Liguori wrote:
> Nicholas Lee wrote:
>
>>> The only thing to think about is how do handle file devices with spaces
>>> in the filename.  This is going to be common I think.
>>>   
>>
>> Since it's a python variable can't you just run a validator on config
>> import and throw an exception if the devive block doesn't exist. 
>> Noting that device paths including special characters need to be
>> enclosured in "...".
>>
>> ie. export=phy:"/dev/vgname/bob your uncle; mate! device", ...
>>  
>>
> Double quotes are actually valid characters in a filename although 
> rarely used.
>
> A more bold way of approaching this would be to adopt a more qemu like 
> syntax of:
>
> hda1="/dev/vgname/bob you uncle; mate1"
> hda2="/root/rockhopper.img"
>
> We could use stat to figure out whether something was a file or a 
> device and use the appropriate script (file or phy).  For everything 
> else, we could use explicit urls such as:
>
> hda3="nbd://rockhopper.austin.ibm.com:1025"
>
> I like the syntax a lot but I'm not sure that marking a device 
> read-only works nicely anymore.  We could have a single readonly 
> attribute like:
>
> readonly=['hda1', 'hda2']
For readonly i would suggest a kind of following syntax:

hda1:r="/dev/..."
hda2:w="/dev/.."

Arnd


	

	
		
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