Example forcible, replace-on-success Luigi task

gistfile1.txt

# generation.py
class ForcibleTask(luigi.Task):
    force_task_families = luigi.ListParameter(
        positional=False, significant=False, default=[]
    )

    def complete(self):
        print("{}: check {}".format(self.get_task_family(), self.output().path))
        if not self.output().exists():
            self.oldinode = 0  # so any new file is considered complete
            return False
        curino = pathlib.Path(self.output().path).stat().st_ino
        try:
            x = self.oldinode
        except AttributeError:
            self.oldinode = curino

        if self.get_task_family() in self.force_task_families:
            # only done when file has been overwritten with new file
            return self.oldinode != curino

        return self.output().exists()

# Example usage
class Generate(ForcibleTask):
    date = luigi.DateParameter()
    def output(self):
        return luigi.LocalTarget(
            self.date.strftime("generated-%Y-%m-%d")
        )


# invocation

luigi --module generation Generate '--Generate-force-task-families=["Generate"]'