function validate_changes(revision_text, branchname)
  local stdin, stdout, pid = spawn_pipe("mtn", "automate", "inventory")

  -- this should get headers properly
  print "Getting format"
  local format = response:read("*l")
  if(format ~= "format-version: 2") then
    print("Don't know that format: " .. format)
    return true
  end
  response:read("*l") --ending empty line

  request:write("l9:inventorye\n")
  request:flush()

  local cmd_number, size, stream, data
  cmd_number = response:read("*n")
  response:read(1) -- ":"
  stream = response:read(1)
  response:read(1) -- ":"
  size = response:read("*n")
  response:read(1) -- ":"
  data = response:read(size)

  if stream == "m" then
    print("Inventory result:")
    print(size)
    print(data)
  end

  return false, "still testing"
end