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Re: [libvirt] [PATCH 1/2] qemu: Add callback struct for qemuBuildCommandLine



On 05/15/2013 11:25 AM, Osier Yang wrote:
> Since 0d70656afded, it starts to access the sysfs files to build
> the qemu command line (by virSCSIDeviceGetSgName, which is to find
> out the scsi generic device name by adpater:bus:target:unit), there
> is no way to work around, qemu wants to see the scsi generic device
> like "/dev/sg6" anyway.
>
> And there might be other places which need to access sysfs files
> when building qemu command line in future.

Then instead of the very specific callback function you've added, why
not add a "sysfsroot" that would be accessed by any commandline-building
function that needed access to sysfs?

This patch is needed to fix a regression, so this may not be the best
time to be discussing what is the optimum design, but we should try to
keep it as simple as possible, and having a callback object that must be
completely filled in by any caller seems complicated (I notice you
didn't check for the possibility of the callback pointers being NULL).
Has anyone enumerated exactly what are the actions currently performed
inside qemuBuildCommandLine() that shouldn't be there?


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