Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images

[Anthony Liguori]

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