Make pytest require code coverage only on full test suite run

I am using something like

# .coveragerc
fail_under = 100

and

# pytest.ini
[pytest]
addopts = --cov=modname/ --cov-report=term-missing

to make it so that my test suite runs the coverage and fails if it isn't 100%.

This works, but the problem is that if I run only a subset of the tests, like

pytest some/specific/test.py

it then complains that the coverage is not 100%, because of course that one single test file doesn't cover the entire codebase. Is there a better way to make pytest run coverage, but only when running the full test suite?

Using a tip from https://github.com/pytest-dev/pytest-cov/issues/418#issuecomment-657219659, I came up with the following (in conftest.py):

def pytest_configure(config):
    if config.args not in [[], ['mylib'], ['mylib/']]:
        cov = config.pluginmanager.get_plugin('_cov')
        cov.options.no_cov = True
        if cov.cov_controller:
            cov.cov_controller.pause()

This also has the benefit of actually disabling coverage, not just the reporting, which makes the tests run faster in these cases.