packagefs: do not use auto-generated attributes for root node

The root node does not come from any package, so it shouldn't have the
SYS:PACKAGE_FILE attribute. Remove it from there.

Fixes #12453

Change-Id: Icb695bb90644753d4af1c4215c4ad3c2dd9c5e68
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5951
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>

src/add-ons/kernel/file_systems/packagefs/nodes/UnpackingDirectory.cpp

@@ -7,6 +7,7 @@
 #include "UnpackingDirectory.h"
 
 #include "DebugSupport.h"
+#include "EmptyAttributeDirectoryCookie.h"
 #include "UnpackingAttributeCookie.h"
 #include "UnpackingAttributeDirectoryCookie.h"
 #include "Utils.h"
@@ -232,6 +233,19 @@ RootDirectory::RootDirectory(ino_t id, const timespec& modifiedTime)
 }
 
 
+status_t
+RootDirectory::OpenAttributeDirectory(AttributeDirectoryCookie*& _cookie)
+{
+	if (HasVFSInitError())
+		return B_ERROR;
+
+	_cookie = new(std::nothrow) EmptyAttributeDirectoryCookie;
+	if (_cookie == nullptr)
+		return B_NO_MEMORY;
+	return B_OK;
+}
+
+
 timespec
 RootDirectory::ModifiedTime() const
 {

src/add-ons/kernel/file_systems/packagefs/nodes/UnpackingDirectory.h

@@ -58,6 +58,9 @@ public:
 								RootDirectory(ino_t id,
 									const timespec& modifiedTime);
 
+	virtual	status_t			OpenAttributeDirectory(
+									AttributeDirectoryCookie*& _cookie) override;
+
 	virtual	timespec			ModifiedTime() const;
 
 private: