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toolshed lib_src nerves_runtime fw_validate.ex
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lib_src/nerves_runtime/fw_validate.ex 

defmodule Toolshed.NervesRuntime.FwValidate do

  @doc """

  Validate a firmware image



  All official Nerves Systems automatically validate newly installed firmware.

  For some systems, it's possible to disable this so that new firmware gets

  one chance to boot. If it's not "validated" before a reboot, then the device

  reverts to the old firmware.

  """

  @spec fw_validate() :: :ok | {:error, String.t()}

  def fw_validate() do

    Nerves.Runtime.validate_firmware()

  catch

    :error, :undef ->

      # Fall back to the old Nerves way

      case System.cmd("fw_setenv", ["nerves_fw_validated", "1"]) do

        {_, 0} -> :ok

        {output, _} -> {:error, output}

      end

  end

end