os

local oldPull = os.pullEvent;
os.pullEvent = os.pullEventRaw;

term.clear()

os.loadAPI("/.sys/crashfix")
os.loadAPI("/.sys/bootloader")

term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)

term.setCursorPos(1,1)

print("Press s to boot into Safe Mode")
print("Press a to boot into advanced boot")
print("Press o to boot into PowerOS")

local event, key = os.pullEvent("key")

if key == keys.s then
  bootloader.safe = true
  bootloader.os = false
  bootloader.advanced = false
  shell.run("/.sys/kernel")
elseif key == keys.a then
  bootloader.os = false
  bootloader.advanced = true
  bootloader.safe = false
  shell.run("/.sys/kernel")
elseif key == keys.o then
  bootloader.advanced = false
  bootloader.safe = false
  bootloader.os = true
  shell.run("/.sys/kernel")
else
  os.reboot()
end

os.pullEvent = oldPull;