deploy: fix CSIStorageCapacity check on alpha clusters

"kubectl api-resources" does not list v1alpha1.storage.k8s.io even
when it is enabled, presumably because it gets superseeded by
v1beta1.storage.k8s.io. That means we need to go back to trying to use
the resource and grepping the output. To get around "-o pipefail", the
return code is explicitly ignored inside the pipe.

Author: pohly

deploy/kubernetes-distributed/deploy.sh

@@ -144,13 +144,19 @@ case "$CSI_PROVISIONER_TAG" in
     "") csistoragecapacities_api=v1alpha1;; # unchanged, assume version from YAML
     *) csistoragecapacities_api=v1beta1;; # set, assume that it is more recent *and* a version that uses v1beta1 (https://github.com/kubernetes-csi/external-provisioner/pull/584)
 esac
-resources=$(kubectl api-resources)
-if echo "$resources" | grep -q "csistoragecapacities.*storage.k8s.io/$csistoragecapacities_api"; then
-    have_csistoragecapacity=true
-else
+get_csistoragecapacities=$(kubectl get csistoragecapacities.${csistoragecapacities_api}.storage.k8s.io 2>&1 || true)
+if  echo "$get_csistoragecapacities" | grep -q "the server doesn't have a resource type"; then
     have_csistoragecapacity=false
+else
+    have_csistoragecapacity=true
+    echo "csistoragecapacities.${csistoragecapacities_api}.storage.k8s.io:"
+    show_lines=4
+    echo "$get_csistoragecapacities" | head -n $show_lines | sed -e 's/^/   /'
+    if [ $(echo "$get_csistoragecapacities" | wc -l) -gt $show_lines ]; then
+        echo "   ..."
+    fi
 fi
-echo "deploying with CSIStorageCapacity: $have_csistoragecapacity"
+echo "deploying with CSIStorageCapacity $csistoragecapacities_api: $have_csistoragecapacity"
 
 # deploy hostpath plugin and registrar sidecar
 echo "deploying hostpath components"