A proof of concept for deploying in two phases

deploy.coffee

Q = require 'q'
exec = Q.denodify require('child_process').exec

nodes = for i in [1..10]
  -> exec "deploy.sh -n=#{ i }"

makeDeploySet = (start, end)
  ->
    set = (deploy() for deploy in nodes[start..end])
    $.when.apply null, set

postToSlack = (message)->
  msg.send message

deployA = makeDeploySet 0, 5
deployB = makeDeploySet 6, 10

deploy = deployA().then -> deployB()
deploy.fin postToSlack