Set dogdroid lockscreen PIN

local function savePIN(pin)
    local file = fs.open("/disk/security/PIN.config", "w")
    file.write(pin)
    file.close()
end

local function confirmPIN(pin)
    term.clear()
    term.setCursorPos(1,1)
    print("Confirm PIN:")
    local confirm = read("*")
    return pin == confirm
end

local function startDevice()
    term.clear()
    term.setCursorPos(1,1)
    print("Starting Device...")
    os.sleep(5)
    shell.run("/disk/os/lock.lua")
end

-- Main program
term.clear()
term.setCursorPos(1,1)
print("Enter new PIN:")
local newPIN = read("*")
if confirmPIN(newPIN) then
    savePIN(newPIN)
    startDevice()
else
    print("PINs do not match. Aborting.")
end