From 89c151c720eb12da6d8371b33279b7f6d3a09a99 Mon Sep 17 00:00:00 2001
From: Christos Choutouridis <hoo2@hoo2.net>
Date: Sat, 26 Sep 2026 20:34:56 +0300
Subject: [PATCH] FIX: renderer checks was in wrong place

---
 source/topology_renderer.py | 33 +++++++++------------------------
 1 file changed, 9 insertions(+), 24 deletions(-)

diff --git a/source/topology_renderer.py b/source/topology_renderer.py
index e6cf602..837dd0c 100644
--- a/source/topology_renderer.py
+++ b/source/topology_renderer.py
@@ -136,17 +136,11 @@ def _render_interface_configuration(interface: PlannedInterface) -> List[str]:
         )
 
     if interface.addressing is AddressingMode.STATIC:
-        if interface.address is None:
-            raise ValueError(
-                "planned static interface %s:%s has no address"
-                % (interface.node, interface.logical_interface)
-            )
-
         lines.append(
             "        _node_cmd(%s, 'ip', 'addr', 'add', %s, 'dev', %s)"
             % (
                 node,
-                _python_string(interface.address),
+                repr(interface.address),
                 name,
             )
         )
@@ -200,19 +194,8 @@ def _render_service_start(service: PlannedService, index: int) -> List[str]:
     Returns:
         Generated Python source lines that start and track the service.
 
-    Raises:
-        ValueError: If the plan contains an unsupported service type or
-            incompatible settings object.
     """
 
-    if service.type is not ServiceType.DHCP_SERVER:
-        raise ValueError(
-            "unsupported planned service type %r" % service.type.value
-        )
-
-    if not isinstance(service.settings, PlannedDHCPServerSettings):
-        raise ValueError("DHCP service has incompatible planned settings")
-
     node = "nodes[%s]" % _python_string(service.node)
     lease_file = "/tmp/mininet-dnsmasq-%d.leases" % index
     pid_file = "/tmp/mininet-dnsmasq-%d.pid" % index
@@ -240,6 +223,12 @@ def _render_service_start(service: PlannedService, index: int) -> List[str]:
     rendered_args = ", ".join(_python_string(arg) for arg in args)
 
     return [
+        "        _node_cmd(%s, 'rm', '-f', %s, %s)"
+        % (
+            node,
+            _python_string(lease_file),
+            _python_string(pid_file),
+        ),
         "        pid = _start_background(",
         "            %s," % node,
         "            [%s]," % rendered_args,
@@ -259,9 +248,6 @@ def render_python(plan: ExecutionPlan) -> str:
         Python source code that creates the network, applies configuration,
         starts services, opens the Mininet CLI, and performs structured cleanup.
 
-    Raises:
-        ValueError: If the supplied plan contains an operation that this
-            renderer cannot serialize.
     """
 
     lines: List[str] = [
@@ -320,7 +306,7 @@ def render_python(plan: ExecutionPlan) -> str:
                     _python_string(node.name),
                 )
             )
-        elif node.type is NodeType.SWITCH:
+        else:
             lines.append(
                 "        nodes[%s] = net.addSwitch(%s, failMode=%r)"
                 % (
@@ -329,8 +315,6 @@ def render_python(plan: ExecutionPlan) -> str:
                     node.switch_fail_mode,
                 )
             )
-        else:
-            raise ValueError("unsupported planned node type %r" % node.type)
 
     lines.extend(["", "        # Create links."])
     for link in plan.links:
@@ -474,6 +458,7 @@ def _self_test() -> None:
     assert "net.addLink(" in source
     assert "cls=TCLink" in source
     assert "dnsmasq" in source
+    assert "rm', '-f', '/tmp/mininet-dnsmasq-0.leases'" in source
     assert "CLI(net)" in source
     assert "dhclient" in source