python click subcommand unified error handling

In the case where there are command groups and every sub-command may raise exceptions, how can I handle them all together in one place?

Given the example below:

import click


@click.group()
def cli():
    pass

@cli.command()
def foo():
    pass

if __name__ == '__main__':
    cli()

Both cli and foo may raise. I know that one possible solution is to place try-except around cli() in the if clause. But that does not work when you distribute a package. In setup.py, you have to specify an entry point (in this case, cli). The if clause will not be executed.