[libvirt] Re: [PATCH] also allow use of XZ for Qemu image compression

[Daniel Veillard]

On Wed, Sep 09, 2009 at 10:17:48AM +0200, Jim Meyering wrote:
> Jim Meyering wrote:
> ...
> > At Chris' suggestion, I've added a comment warning not to do what I did ;-)
> >
> > To make it even more obvious that these numbers matter,
> > I've assigned explicit constants in the enum:
> >
> >   +    QEMUD_SAVE_FORMAT_RAW = 0,
> >   +    QEMUD_SAVE_FORMAT_GZIP = 1,
> >   +    QEMUD_SAVE_FORMAT_BZIP2 = 2,
> >
> > Currently, if someone accidentally adds this (mistakenly reused number):
> >
> >   +    QEMUD_SAVE_FORMAT_OOPS = 2,
> >
> > the compiler won't catch it.
> > However, with a small additional change to use VIR_ENUM_DECL
> > and VIR_ENUM_IMPL, thus replacing the if/elsif/ chains,
> > and the compiler *would* detect that mistake.
> > It'd also help to factor out the QEMUD_SAVE_FORMAT_<> to "<>"
> > association, rather than having literals like "gzip" and "bzip2"
> > in two places.
> >
> > Now that I've described that, I'll prepare a separate patch.
> 
> This depends on the preceding patch.

  yup using VIR_ENUM_IMPL, and VIR_ENUM_DECL is a good cleanup,
could you apply this to the current git, we will then reduce options
later,

  ACK,

Daniel

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