Article R61-1 of the French Code of Criminal Procedure
If the sentence enforcement judge orders the enforcement of the imprisonment provided for by the third paragraph of Article 131-36-1 of the Penal Code, his decision shall specify the duration of the imprisonment to be served. A copy of the decision is given to the offender and, if applicable, to his lawyer. This decision constitutes an order to the head of the designated prison to receive and detain the sentenced…