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From: Avi Kivity <avi@qumranet.com>
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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: Anthony Liguori <anthony@codemonkey.ws>
Cc: =?ISO-8859-1?Q?Jorge_Luc=E1ngeli_Obes?= <t4m5yn@gmail.com>, qemu-devel@nongnu.org

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.