Rat king tweaks (#9000)

Content.Shared/Pulling/Components/SharedPullerComponent.cs

@@ -12,6 +12,12 @@
         [ViewVariables]
         public EntityUid? Pulling { get; set; }
 
+        /// <summary>
+        ///     Does this entity need hands to be able to pull something?
+        /// </summary>
+        [DataField("needsHands")]
+        public bool NeedsHands = true;
+
         protected override void Shutdown()
         {
             EntitySystem.Get<SharedPullingStateManagementSystem>().ForceDisconnectPuller(this);

Content.Shared/Pulling/Systems/SharedPullingSystem.Actions.cs

@@ -1,5 +1,6 @@
 using Content.Shared.ActionBlocker;
 using Content.Shared.Buckle.Components;
+using Content.Shared.Hands.EntitySystems;
 using Content.Shared.Physics.Pull;
 using Content.Shared.Pulling.Components;
 using Content.Shared.Pulling.Events;
@@ -13,10 +14,16 @@ namespace Content.Shared.Pulling
     {
         [Dependency] private readonly ActionBlockerSystem _blocker = default!;
         [Dependency] private readonly SharedContainerSystem _containerSystem = default!;
+        [Dependency] private readonly SharedHandsSystem _handsSystem = default!;
 
         public bool CanPull(EntityUid puller, EntityUid pulled)
         {
-            if (!EntityManager.HasComponent<SharedPullerComponent>(puller))
+            if (!EntityManager.TryGetComponent<SharedPullerComponent>(puller, out var comp))
+            {
+                return false;
+            }
+
+            if (comp.NeedsHands && !_handsSystem.TryGetEmptyHand(puller, out _))
             {
                 return false;
             }

Content.Shared/Pulling/Systems/SharedPullingSystem.cs

@@ -54,7 +54,7 @@ namespace Content.Shared.Pulling
 
         private void AddPullVerbs(EntityUid uid, SharedPullableComponent component, GetVerbsEvent<Verb> args)
         {
-            if (args.Hands == null || !args.CanAccess || !args.CanInteract)
+            if (!args.CanAccess || !args.CanInteract)
                 return;
 
             // Are they trying to pull themselves up by their bootstraps?