Add "volumes" parameter in Kubernetes context

This new parameter, "volumes", will allow the user to automatically create
new volumes. Example of Kubernetes context definition:

  context:
    type: Kubernetes
    servers:
      host:
        image: ...
        commands: ...
        volumes:
          - name: volume1              # mandatory
            <volume type definition>   # mandatory

The volume type and the definition must be one of the supported ones in
Kubernetes [1].

[1] https://kubernetes.io/docs/concepts/storage/volumes/#types-of-volumes

JIRA: YARDSTICK-1152

Change-Id: I44a91c605f047de4f286407e28fb5aa2e921b00a
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/yardstick/common/exceptions.py b/yardstick/common/exceptions.py
index 966b15cf8..5f362b356 100644
--- a/yardstick/common/exceptions.py
+++ b/yardstick/common/exceptions.py
@@ -195,6 +195,10 @@ class WaitTimeout(YardstickException):
     message = 'Wait timeout while waiting for condition'
 
 
+class KubernetesTemplateInvalidVolumeType(YardstickException):
+    message = 'No valid "volume" types present in %(volume)s'
+
+
 class ScenarioCreateNetworkError(YardstickException):
     message = 'Create Neutron Network Scenario failed'
 
diff --git a/yardstick/common/kubernetes_utils.py b/yardstick/common/kubernetes_utils.py
index d60c9b23a..ee8e8edcd 100644
--- a/yardstick/common/kubernetes_utils.py
+++ b/yardstick/common/kubernetes_utils.py
@@ -199,3 +199,9 @@ def get_pod_list(namespace='default'):      # pragma: no cover
 def get_pod_by_name(name):  # pragma: no cover
     pod_list = get_pod_list()
     return next((n for n in pod_list.items if n.metadata.name.startswith(name)), None)
+
+
+def get_volume_types():
+    """Return the "volume" types supported by the current API"""
+    return [vtype for vtype in client.V1Volume.attribute_map.values()
+            if vtype != 'name']