Kernel: Update ErrorOr API and add path find to VFS

These two are done on the same commit since Changes to Shell were
annoying to make work with only one change

kernel/kernel/FS/VirtualFileSystem.cpp

@@ -1,3 +1,5 @@
+#include <BAN/StringView.h>
+#include <BAN/Vector.h>
 #include <kernel/FS/VirtualFileSystem.h>
 
 namespace Kernel
@@ -23,4 +25,18 @@ namespace Kernel
 		return s_instance != nullptr;
 	}
 
+	BAN::ErrorOr<BAN::RefCounted<Inode>> VirtualFileSystem::from_absolute_path(BAN::StringView path)
+	{
+		if (path.front() != '/')
+			return BAN::Error::from_string("Path must be an absolute path");
+
+		auto inode = root_inode();
+		auto path_parts = TRY(path.split('/'));
+		
+		for (BAN::StringView part : path_parts)
+			inode = TRY(inode->directory_find(part));
+		
+		return inode;
+	}
+
 }