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

[Jim Meyering]

Daniel Veillard wrote:

> 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,

Thanks.
Pushed that, along with the other ack'd changes.

Note that that includes the one to use strchrnul,
which required updated .gnulib/.

And a .gnulib/ update requires that anyone building
re-run ./autogen.sh.  But don't worry: if anyone forgets,
"make" will fail with a diagnostic telling them to do just that.