change cx subnet delegation command.

Author: sivakami

.pipelines/swiftv2-long-running/scripts/create_vnets.sh

@@ -79,22 +79,23 @@ delegate_subnet() {
     subnet_id=$(az network vnet subnet show -g "$RG" --vnet-name "$vnet" -n "$subnet" --query id -o tsv)
     modified_custsubnet="${subnet_id//\//%2F}"
 
+    responseFile="delegate_response.txt"
+    cmd_delegator_curl="'curl -X PUT http://localhost:8080/DelegatedSubnet/$modified_custsubnet'"
+    cmd_containerapp_exec="az containerapp exec -n subnetdelegator-westus-u3h4j -g subnetdelegator-westus --subscription 9b8218f9-902a-4d20-a65c-e98acec5362f --command $cmd_delegator_curl"
+    
     while [ $attempt -le $max_attempts ]; do
         echo "Attempt $attempt of $max_attempts..."
 
-        # Use az containerapp exec with --command properly formatted for non-interactive execution
-        response=$(az containerapp exec \
-            -n subnetdelegator-westus-u3h4j \
-            -g subnetdelegator-westus \
-            --subscription 9b8218f9-902a-4d20-a65c-e98acec5362f \
-            --command "curl -X PUT http://localhost:8080/DelegatedSubnet/$modified_custsubnet" 2>&1 || echo "EXEC_FAILED")
-
-        if [[ $response == *"success"* ]]; then
+        # Use script command to provide PTY for az containerapp exec
+        script --quiet -c "$cmd_containerapp_exec" "$responseFile"
+        
+        if grep -qF "success" "$responseFile"; then
             echo "Subnet Delegator successfully registered the subnet"
+            rm -f "$responseFile"
             return 0
         else
             echo "Subnet Delegator failed to register the subnet (attempt $attempt)"
-            echo "Response: $response"
+            cat "$responseFile"
 
             if [ $attempt -lt $max_attempts ]; then
                 echo "Retrying in 5 seconds..."
@@ -106,6 +107,7 @@ delegate_subnet() {
     done
 
     echo "[ERROR] Failed to delegate subnet after $max_attempts attempts"
+    rm -f "$responseFile"
     exit 1
 }