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Re: [libvirt] storage: inconsistent in 'format' scheme between document and implementation



On Thu, May 21, 2009 at 03:57:28PM +0900, Ryota Ozaki wrote:
> Hi,
> 
> I've found a problem that a 'format' element in storage-{pool,vol} XML
> doesn't behave as described in the document.
> 
> The document says that a format of {pool,vol} is specified as the value of
> a format element, like:
> 
> 	<target>
>           <path>/var/lib/virt/images/sparse.img</path>
>           <format>qcow2</format>
>           <permissions>
> 
> However, the implementation doesn't follow this:
> 
>     if (options->formatFromString) {
>         char *format = virXPathString(conn,
> "string(/volume/target/format/@type)", ctxt);
>         if (format == NULL)
>             ret->target.format = options->defaultFormat;
>         else
>             ret->target.format = (options->formatFromString)(format);
> 
>         if (ret->target.format < 0) {
>             virStorageReportError(conn, VIR_ERR_XML_ERROR,
>                                   _("unknown volume format type %s"), format);
>             VIR_FREE(format);
>             goto cleanup;
>         }
>         VIR_FREE(format);
>     }
> 
> The implementation assumes that a format of {pool,vol} is specified as
> the attribute of a format element, like:
> 
> 	<target>
>           <path>/var/lib/virt/images/sparse.img</path>
>           <format type='qcow2' />
>           <permissions>
> 
> Thus, we need to fix either the document or the implementation.
> (I guess the implementation is correct, right?)

Yes, the code is always correct :-P  If only because people will be using
it in the way it works, rather than the way its documented.


Daniel
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