[libvirt] Which symbols can be used in file paths in libvirt's XMLs?

Daniel P. Berrange berrange at redhat.com
Wed Jul 1 16:36:11 UTC 2015

On Wed, Jul 01, 2015 at 07:22:33PM +0300, Dmitry Guryanov wrote:
> Hello,
> There is an absFilePatch type in docs/schemas/basictypes.rng rng schema:
>   <define name="absFilePath">
>     <data type="string">
>       <param
> name="pattern">/[a-zA-Z0-9_\.\+\-\\&"'<>/%,:]+</param>
>     </data>
>   </define>
> There are quite few symbols in this set of the ones, which linux allows to
> have in file paths. For example spaces or curly braces are not allowed.
> There are a lot of elements of this type in other rng schems, for example:


> So the question is, where did this path pattern come from? Is it possible to
> use file paths with another symbols or there will be some problems?

I think this regex pattern is a bit of a misguided attempt to perform
semantic validation on the XML content. I'd probably be inclined to
simplify it to '/.*' and just delegate all other validation to drivers
as they desire.

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