Please create pull requests instead of asking for help on Homebrew‘s GitHubError: macOS 10.13

具体有什么用吾亦不知道。有时提示这个错误，有可能是别的错误引起的。

• 具体错误

Error: You are using macOS 10.13.
We (and Apple) do not provide support for this old version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Twitter or any other official channels. You are responsible for resolving
any issues you experience while you are running this
old version.

• 保存脚本brew.rb

#!/usr/bin/ruby
# This script installs to /usr/local only. To install elsewhere (which is
# unsupported) you can untar https://github.com/Homebrew/brew/tarball/master
# anywhere you like.
HOMEBREW_PREFIX = "/usr/local".freeze
HOMEBREW_REPOSITORY = "/usr/local/Homebrew".freeze
HOMEBREW_CACHE = "#{ENV["HOME"]}/Library/Caches/Homebrew".freeze
BREW_REPO = "git://mirrors.ustc.edu.cn/brew.git".freeze

# TODO: bump version when new macOS is released
MACOS_LATEST_SUPPORTED = "10.15".freeze
# TODO: bump version when new macOS is released
MACOS_OLDEST_SUPPORTED = "10.13".freeze

# no analytics during installation
ENV["HOMEBREW_NO_ANALYTICS_THIS_RUN"] = "1"
ENV["HOMEBREW_NO_ANALYTICS_MESSAGE_OUTPUT"] = "1"

# get nicer global variables
require "English"

module Tty
  module_function

  def blue
    bold 34
  end

  def red
    bold 31
  end

  def reset
    escape 0
  end

  def bold(code = 39)
    escape "1;#{code}"
  end

  def underline
    escape "4;39"
  end

  def escape(code)
    "\033[#{code}m" if STDOUT.tty?
  end
end

class Array
  def shell_s
    cp = dup
    first = cp.shift
    cp.map { |arg| arg.gsub " ", "\\ " }.unshift(first).join(" ")
  end
end

def ohai(*args)
  puts "#{Tty.blue}==>#{Tty.bold} #{args.shell_s}#{Tty.reset}"
end

def warn(warning)
  puts "#{Tty.red}Warning#{Tty.reset}: #{warning.chomp}"
end

def system(*args)
  abort "Failed during: #{args.shell_s}" unless Kernel.system(*args)
end

def sudo(*args)
  args.unshift("-A") unless ENV["SUDO_ASKPASS"].nil?
  ohai "/usr/bin/sudo", *args
  system "/usr/bin/sudo", *args
end

def getc
  system "/bin/stty raw -echo"
  if STDIN.respond_to?(:getbyte)
    STDIN.getbyte
  else
    STDIN.getc
  end
ensure
  system "/bin/stty -raw echo"
end

def wait_for_user
  puts
  puts "Press RETURN to continue or any other key to abort"
  c = getc
  # we test for \r and \n because some stuff does \r instead
  abort unless (c == 13) || (c == 10)
end

class Version
  include Comparable
  attr_reader :parts

  def initialize(str)
    @parts = str.split(".").map(&:to_i)
  end

  def (other)
    parts  self.class.new(other).parts
  end

  def to_s
    parts.join(".")
  end
end

def macos_version
  @macos_version ||= Version.new(`/usr/bin/sw_vers -productVersion`.chomp[/10\.\d+/])
end

def should_install_command_line_tools?
  if macos_version > "10.13"
    !File.exist?("/Library/Developer/CommandLineTools/usr/bin/git")
  else
    !File.exist?("/Library/Developer/CommandLineTools/usr/bin/git") ||
      !File.exist?("/usr/include/iconv.h")
  end
end

def user_only_chmod?(path)
  return false unless File.directory?(path)

  mode = File.stat(path).mode & 0777
  # u = (mode >> 6) & 07
  # g = (mode >> 3) & 07
  # o = (mode >> 0) & 07
  mode != 0755
end

def chmod?(path)
  File.exist?(path) && !(File.readable?(path) && File.writable?(path) && File.executable?(path))
end

def chown?(path)
  !File.owned?(path)
end

def chgrp?(path)
  !File.grpowned?(path)
end

# USER isn't always set so provide a fall back for the installer and subprocesses.
ENV["USER"] ||= `id -un`.chomp

# Invalidate sudo timestamp before exiting (if it wasn't active before).
Kernel.system "/usr/bin/sudo -n -v 2>/dev/null"
at_exit { Kernel.system "/usr/bin/sudo", "-k" } unless $CHILD_STATUS.success?

# The block form of Dir.chdir fails later if Dir.CWD doesn't exist which I
# guess is fair enough. Also sudo prints a warning message for no good reason
Dir.chdir "/usr"

####################################################################### script
if RUBY_PLATFORM.to_s.downcase.include?("linux")
  abort