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Date: Thu, 09 Aug 2007 15:32:45 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command
	line options from qcow2 images
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To: Avi Kivity <avi@qumranet.com>
Cc: =?ISO-8859-1?Q?Jorge_Luc=E1ngeli_Obes?= <t4m5yn@gmail.com>, qemu-devel@nongnu.org

Avi Kivity wrote:
> Anthony Liguori wrote:
>>
>> If you're looking for a low-end solution, another possibility would 
>> be having a "new" file format which consisted of:
>>
>> #!/path/to/qemu [<args> ...] <nl>
>> <standard disk image>
>>
>> And then make the appropriate changes to QEMU such that it can skip 
>> the first line in a disk image file.  This has a few nice side 
>> effects.  The disk image is directly executable and it makes it very 
>> clear to the user that they have to trust the disk image.  The other 
>> nice thing is that it would work with file formats other than qcow2.
>
> Well, it would be nice to align the disk image to a sector boundary 
> (or, better, a page boundary).  But yes, a very good idea.

That has the very nice side effect of allowing you to edit the command 
line with a text editor provided you don't cross the sector boundary.  
Filling with spaces would be pretty nice.

Regards,

Anthony Liguori