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Re: [Xen-devel] [PATCH] tools: allow config file compatibility with new tap syntax



I've seen a couple references to the tap:tapdisk syntax in the last few days - For the record, the change responsible for this is 19346. It's not related to the blktap2 code at all.

The point of making this change was to allow folks to specify a blktap-like driver using qemu (with the syntax tap:ioemu).

The patch makes sense to me. I'd be very happy to be able to use the older tap:<driver> syntax.

--Dutch

On Tue, 9 Jun 2009, Andre Przywara wrote:

Hi,

recently the format of the tap syntax in the config file changed to using a 4 part specifier (tap:tapdisk:<format>:<filename>) instead of the old 3-part one (tap:<qcow>:<filename>). This breaks compatibility with existing config files, a guest start will throw a Python exception and will be aborted. AFAICS currently tap:tapdisk is redundant, so the attached patch simply catches the above mentioned exception and tries to parse the old format in this case. This will help our test work flow, because we can use the same config file for different Xen tools versions.

What is the purpose of the new :tapdisk: specifier? Is it really redundant (at least currently)? Please cry out if there is something that I have missed, otherwise please apply the patch. If applying this patch is not an option, I would opt for a better error message.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>

Regards,
Andre.

--
Andre Przywara
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