Pineapple Juice Cake

INGREDIENTS:

One package (15.25 ounces) Cake mixes, either buttercream or yellow (I like Pillsbury or Betty Crocker)
one-third cup of vegetable oil
one-third cup pineapple juice
Four big eggs

Regarding the glaze:
Two cups of sugar powder
one-third cup pineapple juice
Four tsp unsalted butter