CI: simplify script that adds virtual GPUs to test cluster (#246)

hack/e2e-util.sh

@@ -206,54 +206,12 @@ function wait_for_appwrapper_controller {
 
 function add_virtual_GPUs {
     # Patch nodes to provide GPUs resources without physical GPUs.
-    # This is intended to allow testing of our autopilot integration.
-
-    # Start communication with cluster
-    kubectl proxy --port=0 > .port.dat 2>&1 &
-    proxy_pid=$!
-
-    echo "Starting background proxy connection (pid=${proxy_pid})..."
-    echo "Waiting for proxy process to start."
-    sleep 5
-
-    kube_proxy_port=$(cat .port.dat | awk '{split($5, substrings, ":"); print substrings[2]}')
-    curl -s 127.0.0.1:${kube_proxy_port} > /dev/null 2>&1
-
-    if [[ ! $? -eq 0 ]]; then
-        echo "Calling 'kubectl proxy' did not create a successful connection to the kubelet needed to patch the nodes. Exiting."
-        kill -9 ${proxy_pid}
-        exit 1
-    else
-        echo "Connected to the kubelet for patching the nodes. Using port ${kube_proxy_port}."
-    fi
-
-    rm .port.dat
-
-    # Variables
-    resource_name="nvidia.com~1gpu"
-    resource_count="8"
-
-    # Patch nodes
+    # This enables testing of our autopilot integration.
+    echo "Adding virtual GPUs to all nodes"
     for node_name in $(kubectl get nodes --no-headers -o custom-columns=":metadata.name")
     do
-        echo "- Patching node (add): ${node_name}"
-
-        patching_status=$(curl -s --header "Content-Type: application/json-patch+json" \
-                                --request PATCH \
-                                --data '[{"op": "add", "path": "/status/capacity/'${resource_name}'", "value": "'${resource_count}'"}]' \
-                                http://localhost:${kube_proxy_port}/api/v1/nodes/${node_name}/status | jq -r '.status')
-
-        if [[ ${patching_status} == "Failure" ]]; then
-            echo "Failed to patch node '${node_name}' with GPU resources"
-            exit 1
-        fi
-
-        echo "Patching done!"
+        kubectl patch node $node_name --subresource=status --type=json -p='[{"op":"add","path":"/status/capacity/nvidia.com~1gpu","value":"8"}]'
     done
-
-    # Stop communication with cluster
-    echo "Killing proxy (pid=${proxy_pid})..."
-    kill -9 ${proxy_pid}
 }
 
 # clean up