Enable ZFS storage driver with CentOS v7 libvirt v2.0.0 storage driver

ZFS support is already supported in libvirt. This change simply enables it for the CentOS binary RPM.

Steps:

1. Install ZFS on Linux repository
   
2. Make a few small changes to the RPM SPEC file
3. Build the updated binary

Build

$ rpm -Uvh http://buildlogs.centos.org/c7.1611.01/libvirt/20161112020435/2.0.0-10.el7.x86_64/libvirt-2.0.0-10.el7.src.rpm
$ cd rpmbuild/SPECS/
$ rpmbuild -ba libvirt.spec 

Links

• http://zfsonlinux.org/

Appendices

libvirt.spec changes

$ diff -u libvirt.spec~ libvirt.spec
--- libvirt.spec~       2016-12-18 09:47:49.805082595 +1300
+++ libvirt.spec        2016-12-18 10:37:10.941082595 +1300
@@ -69,6 +69,7 @@
     %define with_storage_sheepdog 0
 %endif
 %define with_storage_gluster 0%{!?_without_storage_gluster:1}
+%define with_storage_zfs     0%{!?_without_storage_zfs:1}
 %define with_numactl          0%{!?_without_numactl:1}

 # A few optional bits off by default, we enable later
@@ -217,7 +218,7 @@
 Summary: Library providing a simple virtualization API
 Name: libvirt
 Version: 2.0.0
-Release: 10%{?dist}%{?extra_release}
+Release: 10zfs%{?dist}%{?extra_release}
 License: LGPLv2+
 Group: Development/Libraries
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
@@ -593,6 +594,9 @@
 BuildRequires: glusterfs-api-devel >= 3.4.1
 BuildRequires: glusterfs-devel >= 3.4.1
 %endif
+%if %{with_storage_zfs}
+BuildRequires: zfs >= 0.6.5.8
+%endif
 %if %{with_storage_sheepdog}
 BuildRequires: sheepdog
 %endif
@@ -825,6 +829,10 @@
 # For Sheepdog support
 Requires: sheepdog
 %endif
+%if %{with_storage_zfs}
+# For ZFS support
+Requires: zfs
+%endif
 %if %{with_qemu}
 # From QEMU RPMs
 Requires: /usr/bin/qemu-img
@@ -1284,6 +1292,12 @@
     %define arg_storage_gluster --without-storage-gluster
 %endif

+%if %{with_storage_zfs}
+    %define arg_storage_zfs --with-storage-zfs
+%else
+    %define arg_storage_zfs --without-storage-zfs
+%endif
+
 %if %{with_numactl}
     %define arg_numactl --with-numactl
 %else
@@ -1391,6 +1405,7 @@
            %{?arg_storage_rbd} \
            %{?arg_storage_sheepdog} \
            %{?arg_storage_gluster} \
+           %{?arg_storage_zfs} \
            %{?arg_numactl} \
            %{?arg_numad} \
            --with-capng \
@@ -2104,6 +2119,9 @@


 %changelog
+* Sun Dec 18 2016 Greg Brackley <greg-libvirt-zfs@lucidsolutions.co.nz> - 2.0.0-10
+- enable ZFS support
+
 * Wed Sep 21 2016 Jiri Denemark <jdenemar@redhat.com> - 2.0.0-10
 - virtlogd: Don't stop or restart along with libvirtd (rhbz#1372576)