On Thu, Feb 17, 2011 at 05:30:02PM -0700, Eric Blake wrote:
> On 02/17/2011 01:19 PM, Justin Clift wrote:
> > On 18/02/2011, at 7:12 AM, Eric Blake wrote:
> > <snip>
> >>
> >> [note to self - it might be possible to drop the nc dependency in the
> >> future, once I finish my conversion from -migration exec: to -migration
> >> fd:, since the spec file only targets distros with new-enough qemu
> >> 0.12.0 or newer; nc would still be needed for qemu 0.10.0, though]
> >
> > Does your conversion affect how libvirt uses ssh for general communication?
> >
> > Pretty sure I've seen some part of libvirt (other than migration) use
> > nc + ssh for general communication to remote qemu (ie with qemu+ssh://).
>
> git grep '"nc"' has two hits:
>
> src/qemu/qemu_migration.c: const char *args[] = { "nc", "-U",
> unixfile, NULL };
>
> Will still need to exist for qemu 0.10.x and 0.11.x (so we'd need it for
> RHEL 5.6, but not for Fedora or RHEL 6; we've already got other
> RHEL-version-related checks in the specfile to make that a conditional
> dependency).
>
> src/remote/remote_driver.c: cmd_argv[j++] = strdup (netcat ?
> netcat : "nc");
>
> Oh wow - we need to convert remote_driver.c over to virCommand.
> However, that's the only other use of "nc", and it involves running nc
> on the remote host, not on the local host, so you _don't_ need to
> 'Requires: nc' just because you installed libvirt-client; rather, it
> seems like it should be libvirt (the server package) that should be
> requiring nc.
>
> In other words, I think we have a missing dependency if you install
> libvirt but not libvirt-client; the reality is that both packages should
> require nc (and libvirt-client can make the dependency conditional if I
> improve migration on newer qemu).
libvirt requires libvirt-client, so its impossible to install
it without libvirt-client already present.
Daniel
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