brew/Library/Homebrew/cask/lib/hbc/utils.rb

module Hbc::Utils; end

require "yaml"
require "open3"
require "stringio"

require "hbc/utils/file"

UPDATE_CMD = "brew uninstall --force brew-cask; brew untap phinze/cask; brew untap caskroom/cask; brew update; brew cleanup; brew cask cleanup".freeze
ISSUES_URL = "https://github.com/caskroom/homebrew-cask#reporting-bugs".freeze

# monkeypatch Object - not a great idea
class Object
  def utf8_inspect
    return inspect unless defined?(Encoding)
    return map(&:utf8_inspect) if respond_to?(:map)
    inspect.force_encoding("UTF-8").sub(%r{\A"(.*)"\Z}, '\1')
  end
end

class Buffer < StringIO
  def initialize(tty = false)
    super()
    @tty = tty
  end

  def tty?
    @tty
  end
end

# global methods

def odebug(title, *sput)
  if Hbc.respond_to?(:debug) && Hbc.debug
    width = Tty.width * 4 - 6
    if $stdout.tty? && title.to_s.length > width
      title = title.to_s[0, width - 3] + "..."
    end
    puts "#{Tty.magenta}==>#{Tty.reset} #{Tty.white}#{title}#{Tty.reset}"
    puts sput unless sput.empty?
  end
end

module Hbc::Utils
  def self.which(cmd, path = ENV["PATH"])
    unless File.basename(cmd) == cmd.to_s
      # cmd contains a directory element
      cmd_pn = Pathname(cmd)
      return nil unless cmd_pn.absolute?
      return resolve_executable(cmd_pn)
    end
    path.split(File::PATH_SEPARATOR).each do |elt|
      fq_cmd = Pathname(elt).expand_path.join(cmd)
      resolved = resolve_executable fq_cmd
      return resolved if resolved
    end
    nil
  end

  def self.resolve_executable(cmd)
    cmd_pn = Pathname(cmd)
    return nil unless cmd_pn.exist?
    return nil unless cmd_pn.executable?
    begin
      cmd_pn = Pathname(cmd_pn.realpath)
    rescue RuntimeError
      return nil
    end
    return nil unless cmd_pn.file?
    cmd_pn
  end

  def self.gain_permissions_remove(path, command: Hbc::SystemCommand)
    if path.respond_to?(:rmtree) && path.exist?
      gain_permissions(path, ["-R"], command, &:rmtree)
    elsif File.symlink?(path)
      gain_permissions(path, ["-h"], command, &FileUtils.method(:rm_f))
    end
  end

  def self.gain_permissions(path, command_args, command)
    tried_permissions = false
    tried_ownership = false
    begin
      yield path
    rescue StandardError
      # in case of permissions problems
      unless tried_permissions
        # TODO: Better handling for the case where path is a symlink.
        #       The -h and -R flags cannot be combined, and behavior is
        #       dependent on whether the file argument has a trailing
        #       slash.  This should do the right thing, but is fragile.
        command.run("/usr/bin/chflags",
                    must_succeed: false,
                    args:         command_args + ["--", "000", path])
        command.run("/bin/chmod",
                    must_succeed: false,
                    args:         command_args + ["--", "u+rwx", path])
        command.run("/bin/chmod",
                    must_succeed: false,
                    args:         command_args + ["-N", path])
        tried_permissions = true
        retry # rmtree
      end
      unless tried_ownership
        # in case of ownership problems
        # TODO: Further examine files to see if ownership is the problem
        #       before using sudo+chown
        ohai "Using sudo to gain ownership of path '#{path}'"
        command.run("/usr/sbin/chown",
                    args: command_args + ["--", current_user, path],
                    sudo: true)
        tried_ownership = true
        # retry chflags/chmod after chown
        tried_permissions = false
        retry # rmtree
      end
    end
  end

  def self.current_user
    Etc.getpwuid(Process.euid).name
  end

  # paths that "look" descendant (textually) will still
  # return false unless both the given paths exist
  def self.file_is_descendant(file, dir)
    file = Pathname.new(file)
    dir  = Pathname.new(dir)
    return false unless file.exist? && dir.exist?
    unless dir.directory?
      onoe "Argument must be a directory: '#{dir}'"
      return false
    end
    unless file.absolute? && dir.absolute?
      onoe "Both arguments must be absolute: '#{file}', '#{dir}'"
      return false
    end
    while file.parent != file
      return true if File.identical?(file, dir)
      file = file.parent
    end
    false
  end

  def self.path_occupied?(path)
    File.exist?(path) || File.symlink?(path)
  end

  def self.error_message_with_suggestions
    <<-EOS.undent
      Most likely, this means you have an outdated version of Homebrew-Cask. Please run:

          #{Tty.green}#{UPDATE_CMD}

      #{Tty.reset}If this doesn’t fix the problem, please report this bug:

          #{Tty.em}#{ISSUES_URL}#{Tty.reset}

    EOS
  end

  def self.method_missing_message(method, token, section = nil)
    poo = []
    poo << "Unexpected method '#{method}' called"
    poo << "during #{section}" if section
    poo << "on Cask #{token}."

    opoo(poo.join(" ") + "\n" + error_message_with_suggestions)
  end

  def self.nowstamp_metadata_path(container_path)
    @timenow ||= Time.now.gmtime
    if container_path.respond_to?(:join)
      precision = 3
      timestamp = @timenow.strftime("%Y%m%d%H%M%S")
      fraction = format("%.#{precision}f", @timenow.to_f - @timenow.to_i)[1..-1]
      timestamp.concat(fraction)
      container_path.join(timestamp)
    end
  end

  def self.size_in_bytes(files)
    Array(files).reduce(0) { |a, e| a + (File.size?(e) || 0) }
  end

  def self.capture_stderr
    previous_stderr = $stderr
    $stderr = StringIO.new
    yield
    $stderr.string
  ensure
    $stderr = previous_stderr
  end
end