Re: [Xen-devel] [PATCH] xl: Special case tap/aio for disk validation

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("Re: [Xen-devel] [PATCH] xl: Special case tap/aio for disk 
validation"):
> FWIW xend notices a relative path and wacks a "/dev/" on the front.

Oh dear.  So is the syntax
   some:pile:of:useless:prefixes:sponge
allowed to mean /dev/sponge ?  What if you want to refer to
/dev/sponge:1 ?  I guess that probably doesn't work right now.

So the right algorithm is:
   - rhs starts with '/': it's a pathname
   - rhs has a colon: it's a prefix
   - rhs has neither: hope it's a pathname in /dev
?

> Shall we pre-deprecate the someprefix: along with all the
> tap:{aio,ioemu,FOO}: stuff while we are at this? IOW the syntax we want
> to actually support going forward would be:
>       (raw|vhd|qcow2|qcow):/path/to/something
> with the toolstack being at liberty to best decide how to achieve the
> necessary format support? (optionally raw: as the default). All the rest
> of the format is really semantically meaningless and supported only for
> compatibility with existing configuration files.

Yes.

Ian.

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