Re: Re: [PATCH v4] qemu: add runtime config option for nbdkit

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On Fri, Jan 05, 2024 at 09:43:52AM +0100, Peter Krempa wrote:
> On Thu, Jan 04, 2024 at 23:39:38 +0100, Peter Krempa wrote:
> > On Thu, Jan 04, 2024 at 12:24:38 -0600, Jonathon Jongsma wrote:
> > > Currently when we build with nbdkit support, libvirt will always try to
> > > use nbdkit to access remote disk sources when it is available. But
> > > without an up-to-date selinux policy allowing this, it will fail.
> > > because the required selinux policies are not yet widely available, we
> > > have disabled nbdkit support on rpm builds for all distributions before
> > > Fedora 40.
> > >
> > > Unfortunately, this makes it more difficult to test nbdkit support.
> > > After someone updates to the necessary selinux policies, they would also
> > > need to rebuild libvirt to enable nbdkit support. By introducing a
> > > configure option (nbdkit_config_default), we can build packages with
> > > nbdkit support but have it disabled by default.
> > >
> > > Signed-off-by: Jonathon Jongsma <jjongsma@xxxxxxxxxx>
> > > Suggested-by: Andrea Bolognani <abologna@xxxxxxxxxx>
> > > ---
> > > changes in v4
> > >  - squashed in Andrea's suggested changes
> > >    - updated error message
> > >    - Changed one instance of WITH_NDBKIT to WITH_NBDKIT :)
> > >    - tested
> >
> > Looks like this broke the upstream CI on centos-stream-8 and mingw-fedoras:
> >
> > https://gitlab.com/libvirt/libvirt/-/jobs/5864171071
> >
> > Run-time dependency libnbd found: YES 1.6.0
> > meson.build:998:4: ERROR: Problem encountered: nbdkit support requires pidfd_open(2)
> > A full log can be found at /root/rpmbuild/BUILD/libvirt-10.0.0/x86_64-redhat-linux-gnu/meson-logs/meson-log.txt
> > error: Bad exit status from /var/tmp/rpm-tmp.HkQf7H (%build)
> >     Bad exit status from /var/tmp/rpm-tmp.HkQf7H (%build)
>
> Okay there are two issues:
>
> - rhel-8 lacks pidfd_open() thus nbdkit support won't work there, and
>   thus can't be force-enabled
>
> - mingw builds explicitly disable mingw, thus setting the new config
>   option breaks as meson doesn't allow it if it's not used
>
> Patch will be posted soon after CI build succeeds.

I'll wait for your patch instead of investigating myself then :)

-- 
Andrea Bolognani / Red Hat / Virtualization
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