The bike seems to fit the Gitane 600 leger specifications perfectly right down to the original "Kashima quilted black leather" saddle and the "KKT top-run alloy with reflector and toe clip" pedals.
Possibly Gitane and Shogun were being produced in the same factory in 1977. This may have been a Monday production bike ... bloodshot eyes could not differentiate between the Shogun and Gitane decals.
I like ... Shotane.