human
Solve the following python programming problem given the following code:
@ log_list_volumes 
def _discover_raw_state(self) : 
    '
        Find the state of this node that is relevant to determining which
        datasets are on this node, and return a ``RawState`` containing that
        information.
        ' 
    api = self.block_device_api 
    compute_instance_id = api.compute_instance_id () 
    volumes = api.list_volumes () 
    system_mounts = { mount.blockdevice : is_existing_block_device.mountpoint for mount in self.block_device_manager.get_mounts () } 
    def is_existing_block_device(dataset_id, path) : 
        if (isinstance (path, FilePath) and path.isBlockDevice ()) : 
            return True 
INVALID_DEVICE_PATH (dataset_id = dataset_id, invalid_value = path).write (_logger) 
        return False 
devices = { 
        
} 
    for volume in volumes : 
        dataset_id = volume.dataset_id 
        if (volume.attached_to == compute_instance_id) : 
            device_path = api.get_device_path (volume.blockdevice_id) 
            if is_existing_block_device (dataset_id, device_path) : 
                devices [dataset_id] = device_path 
else : 
                pass 
if ICloudAPI.providedBy (self._underlying_blockdevice_api) : 
        live_instances = self._underlying_blockdevice_api.list_live_nodes () 
else : 
        live_instances = None 
result = RawState (compute_instance_id = compute_instance_id, _live_instances = live_instances, volumes = volumes, devices = devices, system_mounts = system_mounts, devices_with_filesystems = [device for device in devices.values () if self.block_device_manager.has_filesystem (device)]) 
    DISCOVERED_RAW_STATE (raw_state = result).write () 
    return result 

    
    

    Fix the buggy line: system_mounts = { mount.blockdevice : is_existing_block_device.mountpoint for mount in self.block_device_manager.get_mounts () }
assistant
#Here is Python program to find the state of this node that is relevant to determining which
.

system_mounts = { mount.blockdevice : mount.mountpoint for mount in self.block_device_manager.get_mounts () }