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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.OTPVersion do
   6   @spec version() :: String.t() | nil
   7   def version do
   8     # OTP Version https://erlang.org/doc/system_principles/versions.html#otp-version
   9     [
  10       Path.join(:code.root_dir(), "OTP_VERSION"),
  11       Path.join([:code.root_dir(), "releases", :erlang.system_info(:otp_release), "OTP_VERSION"])
  12     ]
  13     |> get_version_from_files()
  14   end
  15
  16   @spec get_version_from_files([Path.t()]) :: String.t() | nil
  17   def get_version_from_files([]), do: nil
  18
  19   def get_version_from_files([path | paths]) do
  20     if File.exists?(path) do
  21       path
  22       |> File.read!()
  23       |> String.replace(~r/\r|\n|\s/, "")
  24     else
  25       get_version_from_files(paths)
  26     end
  27   end
  28 end