roles: don't build VDDK plugin for new nbdkit

In nbdkit from 1.2.4 the VDDK plugin is already prebuilt and does not
need to be built separately. In fact we should not even try to build it
as this will fail -- the SRPM is missing needed spec file.

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>

Author: nyoxi

tasks/install.yml

@@ -29,8 +29,29 @@
     - nbdkit
     - nbdkit-plugin-python2
 
+- name: Register nbdkit version
+  yum:
+    list: nbdkit
+  register: pkg_nbdkit
+
+- set_fact:
+    pkg_nbdkit: "{{ pkg_nbdkit.results | selectattr('yumstate', '==', 'installed') | first }}"
+
+- debug: var=pkg_nbdkit
+
 - include_tasks: "vddk-install.yml"
+
+# With nbdkit before 1.2.4 we had to build our own version of VDDK plugin
 - include_tasks: "nbdkit-plugin-vddk-rpm.yml"
+  when:
+    - pkg_nbdkit.epoch == "0"
+    - pkg_nbdkit.version is version_compare('1.2.4', '<')
+
+# With nbdkit 1.2.4 and newer we just make sure the package is installed
+- name: Make sure VDDK plugin is installed
+  yum:
+    state: "{{ v2v_yum_check }}"
+    name: nbdkit-plugin-vddk
 
 - name: Install virt-v2v
   yum: