[libvirt] libvirt needs to dynamically support kvm-img and/or qemu-img

[Daniel Veillard]

On Thu, May 28, 2009 at 09:04:55AM -0500, Doug Goldstein wrote:
> Several distros out there install "kvm-img" when they install KVM and
> do not install "qemu-img". The following patch checks for kvm-img and
> qemu-img and does the right thing. I've taken it a step further and
> made the check a run-time check instead of a build-time check since
> people are able to remove and install KVM, QEMU and Xen components as
> they please and as such may invalidate the build-time check. The patch
> prefers "kvm-img" over "qemu-img" over "qcow-create" since there was a
> comment that libvirt wanted to support a feature of qemu-img that
> wasn't present in upstream qemu releases, however the feature is
> present in kvm-img.
> 
> The patch adds a new util function called "virFindFileInPath()" which
> merely searches PATH for the actual location of the binary. It might
> be worth-while to make some of the other build-time tool checks
> run-time with that function since it would allow users to get more
> features just by installing new tools and wouldn't require distros to
> disable features because they don't want libvirt to be too dependency
> heavy.

  Looks reasonnable to me, but the malloc/free calls should be turned
into VIR_ALLOC_N/VIR_FREE. I don't think I would commit this for 0.6.4
though so that will have to be processed next week,

Daniel

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