link support stable

src/DirectoryTree.cpp

@@ -127,6 +127,11 @@ bool Directory::detachNode(const Key& key) {
     return false;
   }
 
+  if (removeNode->key.incomingLinksHard || removeNode->key.incomingLinksDynamic) {
+    gError = "Cannot modify node with incoming hard links";
+    return false;
+  }
+
   removeNode->mParent = nullptr;
   mMembers.remove(DirectoryKey(key));
 

src/FileSystem.cpp

@@ -170,7 +170,10 @@ bool FileSystem::moveNode(const Path &source, const Path &target) {
     return false;
   }
 
-  assert(sourceParentDirectory->detachNode(key));
+  if (!sourceParentDirectory->detachNode(key)) {
+    return false;
+  }
+
   assert(targetDirectory->attachNode(key, sourceNode));
 
   return true;

test/Tests.cpp

@@ -34,6 +34,9 @@ int main() {
   interpreter.interpret("copy a /");
 
   interpreter.interpret("mdl a/b/c /a-copy/k");
+
+  interpreter.interpret("move a/b/c /a-copy");
+
   interpreter.interpret("del /a-copy/k/c");
 
   return UnitTest::RunAllTests();