Reference please. I've never heard of this. Why wasn't he shot for it?
He wasn't shot because he was successful.
Basically, the resistance in northern France was to disrupt German lines of supply during the Normandy Invasion, then those in southern France to support Dragoon in August.
DeGaulle signaled the resistance in Vercors (an isolated plateau west of Grenoble in southern France) to rise up in connection with the Normandy landing. They did so, and proclaimed a free French republic independent of the Gaullists. Of course, it would be months before relief could reach them, and although the mountain assaults were difficult, the Germans did liquidate the rebellion. The British made some effort to support the Vercors by air from North Africa, but it really didn't impact the battle.
Google battle of vercors 1944
There have been 3 or 4 books, and there are a few articles that shed some light on the battle. For a contemporary propaganda piece, see http://trove.nla.gov.au/ndp/del/article/17919378 . It, of course, leaves out the Gaullist role.