VFS: add an exists() function

kernel/include/fs/VFS.h

@@ -42,6 +42,8 @@ namespace VFS
 
     Node* resolve_path(const char* filename, Node* root = nullptr);
 
+    bool exists(const char* pathname);
+
     void mount(Node* mountpoint, Node* mounted);
     void mount(const char* pathname, Node* mounted);
 

kernel/src/fs/VFS.cpp

@@ -160,6 +160,11 @@ int VFS::mkdir(const char* pathname)
     return result;
 }
 
+bool VFS::exists(const char* pathname)
+{
+    return resolve_path(pathname) != nullptr;
+}
+
 void VFS::mount(Node* mountpoint, Node* mounted)
 {
     if (!mountpoint || !mounted) return;