Fix typos linter: rename ot to xfer

Author: weneghawi

docs/TESTING_TFTP.md

@@ -23,8 +23,6 @@ apiVersion: networking.metal.ironcore.dev/v1alpha1
 kind: Device
 metadata:
   name: device-tftp-test
-  labels:
-    networking.metal.ironcore.dev/device-ip: "100.100.5.155"
 spec:
   endpoint:
     address: 100.100.5.155:22
@@ -43,6 +41,10 @@ kubectl -n netop-dev-minmin patch device device-tftp-test \
   --type=merge -p '{"status":{"serialNumber":"tftp-test-serial"}}' --subresource=status
 ```
 
+Note: the controller automatically sets `device-ip` and `device-serial` labels from
+`spec.endpoint.address` and `status.serialNumber` on every reconcile — no need to add
+them manually.
+
 Verify server logs
 ```
 kubectl -n netop-dev-minmin logs deployment/network-operator-controller-manager --tail=200 | grep -E "TFTP|tftp"
@@ -69,12 +71,16 @@ kubectl -n netop-dev-minmin exec tftp-test -- sh -c \
 ```
 Expected: server error (unknown serial).
 
-2) **Wrong client IP** (simulate by changing `DeviceIPLabel` or use a pod from a different IP):
+2) **Wrong client IP** (simulate by changing `spec.endpoint.address` to a different IP):
 ```
 kubectl -n netop-dev-minmin patch device device-tftp-test \
-  --type=merge -p '{"metadata":{"labels":{"networking.metal.ironcore.dev/device-ip":"203.0.113.10"}}}'
+  --type=merge -p '{"spec":{"endpoint":{"address":"203.0.113.10:22"}}}'
 ```
-Then retry TFTP; expect IP mismatch error.
+The controller will update `DeviceIPLabel` to `203.0.113.10` on the next reconcile.
+Then retry TFTP from the original pod; expect IP mismatch error.
+
+Note: do not patch `DeviceIPLabel` directly — the controller reconciles it from
+`spec.endpoint.address` and will overwrite any manual change.
 
 Cleanup
 ```

internal/tftp/server.go

@@ -38,8 +38,8 @@ func New(addr string, verify bool, reader client.Reader, logger *log.Logger) *Se
 func (s *Server) Start(ctx context.Context) error {
 	readHandler := func(filename string, rf io.ReaderFrom) error {
 		srcIP := ""
-		if ot, ok := rf.(tftp.OutgoingTransfer); ok {
-			ra := ot.RemoteAddr()
+		if xfer, ok := rf.(tftp.OutgoingTransfer); ok {
+			ra := xfer.RemoteAddr()
 			srcIP = ra.IP.String()
 		}
 		if srcIP == "" {
@@ -91,8 +91,8 @@ func (s *Server) Start(ctx context.Context) error {
 			return errors.New("empty bootscript")
 		}
 
-		if ot, ok := rf.(tftp.OutgoingTransfer); ok {
-			ot.SetSize(int64(len(bootScript)))
+		if xfer, ok := rf.(tftp.OutgoingTransfer); ok {
+			xfer.SetSize(int64(len(bootScript)))
 		}
 
 		n, err := rf.ReadFrom(bytes.NewReader(bootScript))