Plant getting too big and a couple of other questions.

My plant is 1 week into flowering with about 30cm left of space to grow into. It's currently about 90cm tall. Is it likely to grow too big for the cupboard or am I going have to find a new place, it's already pretty cramped? Also just in general hows it looking? Oh yeah the stain is master kush if that makes a difference.
Oh and also, my plant sometimes gets a tiny bit of light during its dark periods, how much should I worry about this (like the amount of light produced by a couple of candles in a darkened room, for relatively short periods)?
One more thing! The roots are poking out above the soil a bit at the plants base, should I add more soil or just let them be?

Tinfoil=hotspots and yes cover the roots with soil so they are not showing other than that the plants look real good... the candle light shouldnt effect to much ( its just candle light) but i would still try to block any light leaks.. this could slow growth >>> it really depends on the strain ( some strains are more sensitive to light leaks )

Dont let no light leak in during night time

22 days flowering, how's it looking?

Looks nice but you need to get rid of that tinfoil and fix your light leak problem.

if you keep allowing light in during the dark period you are more than likely gonna produce light stress and your plant might hermie on you due to the photosynthesis being preformed during your dark cycle of the photoperiod.