Fixing a hole where the rain gets in

This has been the toughest couple of days of the house renovation process for us so far .  When the work on the new roof started the forecast was for a day of light rain and then a warm weekend.  As soon as things were opened up that changed to something much wetter and colder.  It's been 10-15 degrees colder than normal for this time of year and we had almost constant heavy rain.  The worst part was Friday night, when it rained steadily from early evening until late Saturday morning.  Larry set up a drainage system in the kitchen to funnel the water from the leak back outside, and that caught most of it.  But there was just too much water so it spread out into more areas than the drain could handle.  So we ended up with buckets all over the kitchen to catch the drips, and had to keep adding new containers and emptying the old ones throughout the night.  This is what we ended up with around 3am:

The biggest leak was dripping off the vent pipe over the stove, but fortunately that space was exactly the right size to fit our trash barrel which you can see wedged in there in this pic