[libvirt] [PATCH v2] Drop UML driver

[Daniel P. Berrangé]

On Fri, Dec 14, 2018 at 09:04:03PM +0100, Michal Privoznik wrote:
> The driver is unmaintained, untested and severely broken for
> quite some time now. Since nobody even reported any issue with it
> let us drop it.
> 
> Signed-off-by: Michal Privoznik <mprivozn at redhat.com>

[snip]

> diff --git a/libvirt.spec.in b/libvirt.spec.in
> index 71cd45c603..09472dcadc 100644
> --- a/libvirt.spec.in
> +++ b/libvirt.spec.in
> @@ -20,7 +20,6 @@
>  # The hypervisor drivers that run in libvirtd
>  %define with_qemu          0%{!?_without_qemu:1}
>  %define with_lxc           0%{!?_without_lxc:1}
> -%define with_uml           0%{!?_without_uml:1}
>  %define with_libxl         0%{!?_without_libxl:1}
>  %define with_vbox          0%{!?_without_vbox:1}
>  
> @@ -111,13 +110,12 @@
>  %endif
>  
>  
> -# RHEL doesn't ship OpenVZ, VBox, UML, PowerHypervisor,
> +# RHEL doesn't ship OpenVZ, VBox, PowerHypervisor,
>  # VMware, libxenserver (xenapi), libxenlight (Xen 4.1 and newer),
>  # or HyperV.
>  %if 0%{?rhel}
>      %define with_openvz 0
>      %define with_vbox 0
> -    %define with_uml 0
>      %define with_phyp 0
>      %define with_vmware 0
>      %define with_xenapi 0
> @@ -178,7 +176,7 @@
>  %endif
>  
>  
> -%if %{with_qemu} || %{with_lxc} || %{with_uml}
> +%if %{with_qemu} || %{with_lxc}
>  # numad is used to manage the CPU and memory placement dynamically,
>  # it's not available on many non-x86 architectures.
>      %ifnarch s390 s390x %{arm} riscv64
> @@ -231,9 +229,6 @@ Requires: libvirt-daemon-driver-lxc = %{version}-%{release}
>  %if %{with_qemu}
>  Requires: libvirt-daemon-driver-qemu = %{version}-%{release}
>  %endif
> -%if %{with_uml}
> -Requires: libvirt-daemon-driver-uml = %{version}-%{release}
> -%endif
>  %if %{with_vbox}
>  Requires: libvirt-daemon-driver-vbox = %{version}-%{release}
>  %endif

Because the main "libvirt" RPM depended on "libvirt-daemon-driver-uml",
there will be existing users with that sub-RPM installed, even if they
were never using it.

Deleting the sub-RPM thus breaks the upgrade path, because RPM will
not see any newer "libvirt-daemon-driver-uml" sub-RPM to upgrade to.

It is thus required to add an

   Obsoletes: libvirt-daemon-driver-uml <= 5.0.0

to the main libvirt RPM.

Regards,
Daniel
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