
yes Carrefour will be open

In France, a general strike is only done by public services and state workers.

As our train company is still public (to simplify.....), this is an "union fortress"... and they have the mean to block the whole country.
Carrefour is (hopefully) a private company, and employees never do strike.
With its half-public status, the ACO won't go on strike either. Did you imagine if ACO would be on strike next week?
It would be no controllers at the entrance of the campsites...
... but no race either to attend !