make sure os is defined
make sure os is defined

We need to assert os is defined to ensure that the remain tasks will do
right things.
twaldrop/ursula,wupeiran/ursula,blueboxgroup/ursula,channus/ursula,channus/ursula,lihkin213/ursula,ddaskal/ursula,ddaskal/ursula,blueboxgroup/ursula,fancyhe/ursula,nirajdp76/ursula,rongzhus/ursula,twaldrop/ursula,fancyhe/ursula,blueboxgroup/ursula,blueboxgroup/ursula,lihkin213/ursula,nirajdp76/ursula,panxia6679/ursula,fancyhe/ursula,pgraziano/ursula,pgraziano/ursula,knandya/ursula,knandya/ursula,rongzhus/ursula,edtubillara/ursula,wupeiran/ursula,knandya/ursula,pgraziano/ursula,nirajdp76/ursula,panxia6679/ursula,wupeiran/ursula,rongzhus/ursula,lihkin213/ursula,wupeiran/ursula,pgraziano/ursula,panxia6679/ursula,lihkin213/ursula,ddaskal/ursula,twaldrop/ursula,edtubillara/ursula,nirajdp76/ursula,edtubillara/ursula,knandya/ursula,channus/ursula,panxia6679/ursula,edtubillara/ursula,fancyhe/ursula,twaldrop/ursula,rongzhus/ursula,channus/ursula,ddaskal/ursula