# File lib/fileutils.rb, line 137
def cd(dir, verbose: nil, &block) # :yield: dir
  fu_output_message "cd #{dir}" if verbose
  result = Dir.chdir(dir, &block)
  fu_output_message 'cd -' if verbose and block
  result
end

# File lib/fileutils.rb, line 1012
def chmod(mode, list, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message sprintf('chmod %s %s', mode_to_s(mode), list.join(' ')) if verbose
  return if noop
  list.each do |path|
    Entry_.new(path).chmod(fu_mode(mode, path))
  end
end

# File lib/fileutils.rb, line 1029
def chmod_R(mode, list, noop: nil, verbose: nil, force: nil)
  list = fu_list(list)
  fu_output_message sprintf('chmod -R%s %s %s',
                            (force ? 'f' : ''),
                            mode_to_s(mode), list.join(' ')) if verbose
  return if noop
  list.each do |root|
    Entry_.new(root).traverse do |ent|
      begin
        ent.chmod(fu_mode(mode, ent.path))
      rescue
        raise unless force
      end
    end
  end
end

# File lib/fileutils.rb, line 1057
def chown(user, group, list, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message sprintf('chown %s %s',
                            (group ? "#{user}:#{group}" : user || ':'),
                            list.join(' ')) if verbose
  return if noop
  uid = fu_get_uid(user)
  gid = fu_get_gid(group)
  list.each do |path|
    Entry_.new(path).chown uid, gid
  end
end

# File lib/fileutils.rb, line 1081
def chown_R(user, group, list, noop: nil, verbose: nil, force: nil)
  list = fu_list(list)
  fu_output_message sprintf('chown -R%s %s %s',
                            (force ? 'f' : ''),
                            (group ? "#{user}:#{group}" : user || ':'),
                            list.join(' ')) if verbose
  return if noop
  uid = fu_get_uid(user)
  gid = fu_get_gid(group)
  list.each do |root|
    Entry_.new(root).traverse do |ent|
      begin
        ent.chown uid, gid
      rescue
        raise unless force
      end
    end
  end
end

# File lib/fileutils.rb, line 1680
def self.collect_method(opt)
  OPT_TABLE.keys.select {|m| OPT_TABLE[m].include?(opt) }
end

# File lib/fileutils.rb, line 1641
def self.commands
  OPT_TABLE.keys
end

# File lib/fileutils.rb, line 816
def compare_file(a, b)
  return false unless File.size(a) == File.size(b)
  File.open(a, 'rb') {|fa|
    File.open(b, 'rb') {|fb|
      return compare_stream(fa, fb)
    }
  }
end

# File lib/fileutils.rb, line 834
def compare_stream(a, b)
  bsize = fu_stream_blksize(a, b)

  if RUBY_VERSION > "2.4"
    sa = String.new(capacity: bsize)
    sb = String.new(capacity: bsize)
  else
    sa = String.new
    sb = String.new
  end

  begin
    a.read(bsize, sa)
    b.read(bsize, sb)
    return true if sa.empty? && sb.empty?
  end while sa == sb
  false
end

# File lib/fileutils.rb, line 489
def copy_entry(src, dest, preserve = false, dereference_root = false, remove_destination = false)
  if dereference_root
    src = File.realpath(src)
  end

  Entry_.new(src, nil, false).wrap_traverse(proc do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    File.unlink destent.path if remove_destination && (File.file?(destent.path) || File.symlink?(destent.path))
    ent.copy destent.path
  end, proc do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    ent.copy_metadata destent.path if preserve
  end)
end

# File lib/fileutils.rb, line 509
def copy_file(src, dest, preserve = false, dereference = true)
  ent = Entry_.new(src, nil, dereference)
  ent.copy_file dest
  ent.copy_metadata dest if preserve
end

# File lib/fileutils.rb, line 521
def copy_stream(src, dest)
  IO.copy_stream(src, dest)
end

# File lib/fileutils.rb, line 426
def cp(src, dest, preserve: nil, noop: nil, verbose: nil)
  fu_output_message "cp#{preserve ? ' -p' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    copy_file s, d, preserve
  end
end

# File lib/fileutils.rb, line 339
def cp_lr(src, dest, noop: nil, verbose: nil,
          dereference_root: true, remove_destination: false)
  fu_output_message "cp -lr#{remove_destination ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    link_entry s, d, dereference_root, remove_destination
  end
end

# File lib/fileutils.rb, line 463
def cp_r(src, dest, preserve: nil, noop: nil, verbose: nil,
         dereference_root: true, remove_destination: nil)
  fu_output_message "cp -r#{preserve ? 'p' : ''}#{remove_destination ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    copy_entry s, d, preserve, dereference_root, remove_destination
  end
end

# File lib/fileutils.rb, line 1661
def self.have_option?(mid, opt)
  li = OPT_TABLE[mid.to_s] or raise ArgumentError, "no such method: #{mid}"
  li.include?(opt)
end

# File lib/fileutils.rb, line 862
def install(src, dest, mode: nil, owner: nil, group: nil, preserve: nil,
            noop: nil, verbose: nil)
  if verbose
    msg = +"install -c"
    msg << ' -p' if preserve
    msg << ' -m ' << mode_to_s(mode) if mode
    msg << " -o #{owner}" if owner
    msg << " -g #{group}" if group
    msg << ' ' << [src,dest].flatten.join(' ')
    fu_output_message msg
  end
  return if noop
  uid = fu_get_uid(owner)
  gid = fu_get_gid(group)
  fu_each_src_dest(src, dest) do |s, d|
    st = File.stat(s)
    unless File.exist?(d) and compare_file(s, d)
      remove_file d, true
      copy_file s, d
      File.utime st.atime, st.mtime, d if preserve
      File.chmod fu_mode(mode, st), d if mode
      File.chown uid, gid, d if uid or gid
    end
  end
end

# File lib/fileutils.rb, line 406
def link_entry(src, dest, dereference_root = false, remove_destination = false)
  Entry_.new(src, nil, dereference_root).traverse do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    File.unlink destent.path if remove_destination && File.file?(destent.path)
    ent.link destent.path
  end
end

# File lib/fileutils.rb, line 303
def ln(src, dest, force: nil, noop: nil, verbose: nil)
  fu_output_message "ln#{force ? ' -f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest0(src, dest) do |s,d|
    remove_file d, true if force
    File.link s, d
  end
end

# File lib/fileutils.rb, line 369
def ln_s(src, dest, force: nil, noop: nil, verbose: nil)
  fu_output_message "ln -s#{force ? 'f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest0(src, dest) do |s,d|
    remove_file d, true if force
    File.symlink s, d
  end
end

# File lib/fileutils.rb, line 390
def ln_sf(src, dest, noop: nil, verbose: nil)
  ln_s src, dest, force: true, noop: noop, verbose: verbose
end

# File lib/fileutils.rb, line 180
def mkdir(list, mode: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "mkdir #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
  return if noop

  list.each do |dir|
    fu_mkdir dir, mode
  end
end

# File lib/fileutils.rb, line 206
def mkdir_p(list, mode: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "mkdir -p #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
  return *list if noop

  list.map {|path| remove_trailing_slash(path)}.each do |path|
    # optimize for the most common case
    begin
      fu_mkdir path, mode
      next
    rescue SystemCallError
      next if File.directory?(path)
    end

    stack = []
    until path == stack.last   # dirname("/")=="/", dirname("C:/")=="C:/"
      stack.push path
      path = File.dirname(path)
    end
    stack.pop                 # root directory should exist
    stack.reverse_each do |dir|
      begin
        fu_mkdir dir, mode
      rescue SystemCallError
        raise unless File.directory?(dir)
      end
    end
  end

  return *list
end

# File lib/fileutils.rb, line 536
def mv(src, dest, force: nil, noop: nil, verbose: nil, secure: nil)
  fu_output_message "mv#{force ? ' -f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    destent = Entry_.new(d, nil, true)
    begin
      if destent.exist?
        if destent.directory?
          raise Errno::EEXIST, d
        end
      end
      begin
        File.rename s, d
      rescue Errno::EXDEV,
             Errno::EPERM # move from unencrypted to encrypted dir (ext4)
        copy_entry s, d, true
        if secure
          remove_entry_secure s, force
        else
          remove_entry s, force
        end
      end
    rescue SystemCallError
      raise unless force
    end
  end
end

# File lib/fileutils.rb, line 1650
def self.options
  OPT_TABLE.values.flatten.uniq.map {|sym| sym.to_s }
end

# File lib/fileutils.rb, line 1671
def self.options_of(mid)
  OPT_TABLE[mid.to_s].map {|sym| sym.to_s }
end

# File lib/fileutils.rb, line 115
def pwd
  Dir.pwd
end

# File lib/fileutils.rb, line 805
def remove_dir(path, force = false)
  remove_entry path, force   # FIXME?? check if it is a directory
end

# File lib/fileutils.rb, line 777
def remove_entry(path, force = false)
  Entry_.new(path).postorder_traverse do |ent|
    begin
      ent.remove
    rescue
      raise unless force
    end
  end
rescue
  raise unless force
end

# File lib/fileutils.rb, line 684
def remove_entry_secure(path, force = false)
  unless fu_have_symlink?
    remove_entry path, force
    return
  end
  fullpath = File.expand_path(path)
  st = File.lstat(fullpath)
  unless st.directory?
    File.unlink fullpath
    return
  end
  # is a directory.
  parent_st = File.stat(File.dirname(fullpath))
  unless parent_st.world_writable?
    remove_entry path, force
    return
  end
  unless parent_st.sticky?
    raise ArgumentError, "parent directory is world writable, FileUtils#remove_entry_secure does not work; abort: #{path.inspect} (parent directory mode #{'%o' % parent_st.mode})"
  end

  # freeze tree root
  euid = Process.euid
  dot_file = fullpath + "/."
  begin
    File.open(dot_file) {|f|
      unless fu_stat_identical_entry?(st, f.stat)
        # symlink (TOC-to-TOU attack?)
        File.unlink fullpath
        return
      end
      f.chown euid, -1
      f.chmod 0700
    }
  rescue Errno::EISDIR # JRuby in non-native mode can't open files as dirs
    File.lstat(dot_file).tap {|fstat|
      unless fu_stat_identical_entry?(st, fstat)
        # symlink (TOC-to-TOU attack?)
        File.unlink fullpath
        return
      end
      File.chown euid, -1, dot_file
      File.chmod 0700, dot_file
    }
  end

  unless fu_stat_identical_entry?(st, File.lstat(fullpath))
    # TOC-to-TOU attack?
    File.unlink fullpath
    return
  end

  # ---- tree root is frozen ----
  root = Entry_.new(path)
  root.preorder_traverse do |ent|
    if ent.directory?
      ent.chown euid, -1
      ent.chmod 0700
    end
  end
  root.postorder_traverse do |ent|
    begin
      ent.remove
    rescue
      raise unless force
    end
  end
rescue
  raise unless force
end

# File lib/fileutils.rb, line 794
def remove_file(path, force = false)
  Entry_.new(path).remove_file
rescue
  raise unless force
end

# File lib/fileutils.rb, line 576
def rm(list, force: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "rm#{force ? ' -f' : ''} #{list.join ' '}" if verbose
  return if noop

  list.each do |path|
    remove_file path, force
  end
end

# File lib/fileutils.rb, line 595
def rm_f(list, noop: nil, verbose: nil)
  rm list, force: true, noop: noop, verbose: verbose
end

# File lib/fileutils.rb, line 622
def rm_r(list, force: nil, noop: nil, verbose: nil, secure: nil)
  list = fu_list(list)
  fu_output_message "rm -r#{force ? 'f' : ''} #{list.join ' '}" if verbose
  return if noop
  list.each do |path|
    if secure
      remove_entry_secure path, force
    else
      remove_entry path, force
    end
  end
end

# File lib/fileutils.rb, line 644
def rm_rf(list, noop: nil, verbose: nil, secure: nil)
  rm_r list, force: true, noop: noop, verbose: verbose, secure: secure
end

# File lib/fileutils.rb, line 263
def rmdir(list, parents: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "rmdir #{parents ? '-p ' : ''}#{list.join ' '}" if verbose
  return if noop
  list.each do |dir|
    Dir.rmdir(dir = remove_trailing_slash(dir))
    if parents
      begin
        until (parent = File.dirname(dir)) == '.' or parent == dir
          dir = parent
          Dir.rmdir(dir)
        end
      rescue Errno::ENOTEMPTY, Errno::EEXIST, Errno::ENOENT
      end
    end
  end
end

# File lib/fileutils.rb, line 1137
def touch(list, noop: nil, verbose: nil, mtime: nil, nocreate: nil)
  list = fu_list(list)
  t = mtime
  if verbose
    fu_output_message "touch #{nocreate ? '-c ' : ''}#{t ? t.strftime('-t %Y%m%d%H%M.%S ') : ''}#{list.join ' '}"
  end
  return if noop
  list.each do |path|
    created = nocreate
    begin
      File.utime(t, t, path)
    rescue Errno::ENOENT
      raise if created
      File.open(path, 'a') {
        ;
      }
      created = true
      retry if t
    end
  end
end

# File lib/fileutils.rb, line 155
def uptodate?(new, old_list)
  return false unless File.exist?(new)
  new_time = File.mtime(new)
  old_list.each do |old|
    if File.exist?(old)
      return false unless new_time > File.mtime(old)
    end
  end
  true
end

# File lib/fileutils.rb, line 137
def cd(dir, verbose: nil, &block) # :yield: dir
  fu_output_message "cd #{dir}" if verbose
  result = Dir.chdir(dir, &block)
  fu_output_message 'cd -' if verbose and block
  result
end

# File lib/fileutils.rb, line 1012
def chmod(mode, list, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message sprintf('chmod %s %s', mode_to_s(mode), list.join(' ')) if verbose
  return if noop
  list.each do |path|
    Entry_.new(path).chmod(fu_mode(mode, path))
  end
end

# File lib/fileutils.rb, line 1029
def chmod_R(mode, list, noop: nil, verbose: nil, force: nil)
  list = fu_list(list)
  fu_output_message sprintf('chmod -R%s %s %s',
                            (force ? 'f' : ''),
                            mode_to_s(mode), list.join(' ')) if verbose
  return if noop
  list.each do |root|
    Entry_.new(root).traverse do |ent|
      begin
        ent.chmod(fu_mode(mode, ent.path))
      rescue
        raise unless force
      end
    end
  end
end

# File lib/fileutils.rb, line 1057
def chown(user, group, list, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message sprintf('chown %s %s',
                            (group ? "#{user}:#{group}" : user || ':'),
                            list.join(' ')) if verbose
  return if noop
  uid = fu_get_uid(user)
  gid = fu_get_gid(group)
  list.each do |path|
    Entry_.new(path).chown uid, gid
  end
end

# File lib/fileutils.rb, line 1081
def chown_R(user, group, list, noop: nil, verbose: nil, force: nil)
  list = fu_list(list)
  fu_output_message sprintf('chown -R%s %s %s',
                            (force ? 'f' : ''),
                            (group ? "#{user}:#{group}" : user || ':'),
                            list.join(' ')) if verbose
  return if noop
  uid = fu_get_uid(user)
  gid = fu_get_gid(group)
  list.each do |root|
    Entry_.new(root).traverse do |ent|
      begin
        ent.chown uid, gid
      rescue
        raise unless force
      end
    end
  end
end

# File lib/fileutils.rb, line 816
def compare_file(a, b)
  return false unless File.size(a) == File.size(b)
  File.open(a, 'rb') {|fa|
    File.open(b, 'rb') {|fb|
      return compare_stream(fa, fb)
    }
  }
end

# File lib/fileutils.rb, line 834
def compare_stream(a, b)
  bsize = fu_stream_blksize(a, b)

  if RUBY_VERSION > "2.4"
    sa = String.new(capacity: bsize)
    sb = String.new(capacity: bsize)
  else
    sa = String.new
    sb = String.new
  end

  begin
    a.read(bsize, sa)
    b.read(bsize, sb)
    return true if sa.empty? && sb.empty?
  end while sa == sb
  false
end

# File lib/fileutils.rb, line 489
def copy_entry(src, dest, preserve = false, dereference_root = false, remove_destination = false)
  if dereference_root
    src = File.realpath(src)
  end

  Entry_.new(src, nil, false).wrap_traverse(proc do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    File.unlink destent.path if remove_destination && (File.file?(destent.path) || File.symlink?(destent.path))
    ent.copy destent.path
  end, proc do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    ent.copy_metadata destent.path if preserve
  end)
end

# File lib/fileutils.rb, line 509
def copy_file(src, dest, preserve = false, dereference = true)
  ent = Entry_.new(src, nil, dereference)
  ent.copy_file dest
  ent.copy_metadata dest if preserve
end

# File lib/fileutils.rb, line 521
def copy_stream(src, dest)
  IO.copy_stream(src, dest)
end

# File lib/fileutils.rb, line 426
def cp(src, dest, preserve: nil, noop: nil, verbose: nil)
  fu_output_message "cp#{preserve ? ' -p' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    copy_file s, d, preserve
  end
end

# File lib/fileutils.rb, line 339
def cp_lr(src, dest, noop: nil, verbose: nil,
          dereference_root: true, remove_destination: false)
  fu_output_message "cp -lr#{remove_destination ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    link_entry s, d, dereference_root, remove_destination
  end
end

# File lib/fileutils.rb, line 463
def cp_r(src, dest, preserve: nil, noop: nil, verbose: nil,
         dereference_root: true, remove_destination: nil)
  fu_output_message "cp -r#{preserve ? 'p' : ''}#{remove_destination ? ' --remove-destination' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    copy_entry s, d, preserve, dereference_root, remove_destination
  end
end

# File lib/fileutils.rb, line 862
def install(src, dest, mode: nil, owner: nil, group: nil, preserve: nil,
            noop: nil, verbose: nil)
  if verbose
    msg = +"install -c"
    msg << ' -p' if preserve
    msg << ' -m ' << mode_to_s(mode) if mode
    msg << " -o #{owner}" if owner
    msg << " -g #{group}" if group
    msg << ' ' << [src,dest].flatten.join(' ')
    fu_output_message msg
  end
  return if noop
  uid = fu_get_uid(owner)
  gid = fu_get_gid(group)
  fu_each_src_dest(src, dest) do |s, d|
    st = File.stat(s)
    unless File.exist?(d) and compare_file(s, d)
      remove_file d, true
      copy_file s, d
      File.utime st.atime, st.mtime, d if preserve
      File.chmod fu_mode(mode, st), d if mode
      File.chown uid, gid, d if uid or gid
    end
  end
end

# File lib/fileutils.rb, line 406
def link_entry(src, dest, dereference_root = false, remove_destination = false)
  Entry_.new(src, nil, dereference_root).traverse do |ent|
    destent = Entry_.new(dest, ent.rel, false)
    File.unlink destent.path if remove_destination && File.file?(destent.path)
    ent.link destent.path
  end
end

# File lib/fileutils.rb, line 303
def ln(src, dest, force: nil, noop: nil, verbose: nil)
  fu_output_message "ln#{force ? ' -f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest0(src, dest) do |s,d|
    remove_file d, true if force
    File.link s, d
  end
end

# File lib/fileutils.rb, line 369
def ln_s(src, dest, force: nil, noop: nil, verbose: nil)
  fu_output_message "ln -s#{force ? 'f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest0(src, dest) do |s,d|
    remove_file d, true if force
    File.symlink s, d
  end
end

# File lib/fileutils.rb, line 390
def ln_sf(src, dest, noop: nil, verbose: nil)
  ln_s src, dest, force: true, noop: noop, verbose: verbose
end

# File lib/fileutils.rb, line 180
def mkdir(list, mode: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "mkdir #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
  return if noop

  list.each do |dir|
    fu_mkdir dir, mode
  end
end

# File lib/fileutils.rb, line 206
def mkdir_p(list, mode: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "mkdir -p #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
  return *list if noop

  list.map {|path| remove_trailing_slash(path)}.each do |path|
    # optimize for the most common case
    begin
      fu_mkdir path, mode
      next
    rescue SystemCallError
      next if File.directory?(path)
    end

    stack = []
    until path == stack.last   # dirname("/")=="/", dirname("C:/")=="C:/"
      stack.push path
      path = File.dirname(path)
    end
    stack.pop                 # root directory should exist
    stack.reverse_each do |dir|
      begin
        fu_mkdir dir, mode
      rescue SystemCallError
        raise unless File.directory?(dir)
      end
    end
  end

  return *list
end

# File lib/fileutils.rb, line 536
def mv(src, dest, force: nil, noop: nil, verbose: nil, secure: nil)
  fu_output_message "mv#{force ? ' -f' : ''} #{[src,dest].flatten.join ' '}" if verbose
  return if noop
  fu_each_src_dest(src, dest) do |s, d|
    destent = Entry_.new(d, nil, true)
    begin
      if destent.exist?
        if destent.directory?
          raise Errno::EEXIST, d
        end
      end
      begin
        File.rename s, d
      rescue Errno::EXDEV,
             Errno::EPERM # move from unencrypted to encrypted dir (ext4)
        copy_entry s, d, true
        if secure
          remove_entry_secure s, force
        else
          remove_entry s, force
        end
      end
    rescue SystemCallError
      raise unless force
    end
  end
end

# File lib/fileutils.rb, line 115
def pwd
  Dir.pwd
end

# File lib/fileutils.rb, line 805
def remove_dir(path, force = false)
  remove_entry path, force   # FIXME?? check if it is a directory
end

# File lib/fileutils.rb, line 777
def remove_entry(path, force = false)
  Entry_.new(path).postorder_traverse do |ent|
    begin
      ent.remove
    rescue
      raise unless force
    end
  end
rescue
  raise unless force
end

# File lib/fileutils.rb, line 684
def remove_entry_secure(path, force = false)
  unless fu_have_symlink?
    remove_entry path, force
    return
  end
  fullpath = File.expand_path(path)
  st = File.lstat(fullpath)
  unless st.directory?
    File.unlink fullpath
    return
  end
  # is a directory.
  parent_st = File.stat(File.dirname(fullpath))
  unless parent_st.world_writable?
    remove_entry path, force
    return
  end
  unless parent_st.sticky?
    raise ArgumentError, "parent directory is world writable, FileUtils#remove_entry_secure does not work; abort: #{path.inspect} (parent directory mode #{'%o' % parent_st.mode})"
  end

  # freeze tree root
  euid = Process.euid
  dot_file = fullpath + "/."
  begin
    File.open(dot_file) {|f|
      unless fu_stat_identical_entry?(st, f.stat)
        # symlink (TOC-to-TOU attack?)
        File.unlink fullpath
        return
      end
      f.chown euid, -1
      f.chmod 0700
    }
  rescue Errno::EISDIR # JRuby in non-native mode can't open files as dirs
    File.lstat(dot_file).tap {|fstat|
      unless fu_stat_identical_entry?(st, fstat)
        # symlink (TOC-to-TOU attack?)
        File.unlink fullpath
        return
      end
      File.chown euid, -1, dot_file
      File.chmod 0700, dot_file
    }
  end

  unless fu_stat_identical_entry?(st, File.lstat(fullpath))
    # TOC-to-TOU attack?
    File.unlink fullpath
    return
  end

  # ---- tree root is frozen ----
  root = Entry_.new(path)
  root.preorder_traverse do |ent|
    if ent.directory?
      ent.chown euid, -1
      ent.chmod 0700
    end
  end
  root.postorder_traverse do |ent|
    begin
      ent.remove
    rescue
      raise unless force
    end
  end
rescue
  raise unless force
end

# File lib/fileutils.rb, line 794
def remove_file(path, force = false)
  Entry_.new(path).remove_file
rescue
  raise unless force
end

# File lib/fileutils.rb, line 576
def rm(list, force: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "rm#{force ? ' -f' : ''} #{list.join ' '}" if verbose
  return if noop

  list.each do |path|
    remove_file path, force
  end
end

# File lib/fileutils.rb, line 595
def rm_f(list, noop: nil, verbose: nil)
  rm list, force: true, noop: noop, verbose: verbose
end

# File lib/fileutils.rb, line 622
def rm_r(list, force: nil, noop: nil, verbose: nil, secure: nil)
  list = fu_list(list)
  fu_output_message "rm -r#{force ? 'f' : ''} #{list.join ' '}" if verbose
  return if noop
  list.each do |path|
    if secure
      remove_entry_secure path, force
    else
      remove_entry path, force
    end
  end
end

# File lib/fileutils.rb, line 644
def rm_rf(list, noop: nil, verbose: nil, secure: nil)
  rm_r list, force: true, noop: noop, verbose: verbose, secure: secure
end

# File lib/fileutils.rb, line 263
def rmdir(list, parents: nil, noop: nil, verbose: nil)
  list = fu_list(list)
  fu_output_message "rmdir #{parents ? '-p ' : ''}#{list.join ' '}" if verbose
  return if noop
  list.each do |dir|
    Dir.rmdir(dir = remove_trailing_slash(dir))
    if parents
      begin
        until (parent = File.dirname(dir)) == '.' or parent == dir
          dir = parent
          Dir.rmdir(dir)
        end
      rescue Errno::ENOTEMPTY, Errno::EEXIST, Errno::ENOENT
      end
    end
  end
end

# File lib/fileutils.rb, line 1137
def touch(list, noop: nil, verbose: nil, mtime: nil, nocreate: nil)
  list = fu_list(list)
  t = mtime
  if verbose
    fu_output_message "touch #{nocreate ? '-c ' : ''}#{t ? t.strftime('-t %Y%m%d%H%M.%S ') : ''}#{list.join ' '}"
  end
  return if noop
  list.each do |path|
    created = nocreate
    begin
      File.utime(t, t, path)
    rescue Errno::ENOENT
      raise if created
      File.open(path, 'a') {
        ;
      }
      created = true
      retry if t
    end
  end
end

# File lib/fileutils.rb, line 155
def uptodate?(new, old_list)
  return false unless File.exist?(new)
  new_time = File.mtime(new)
  old_list.each do |old|
    if File.exist?(old)
      return false unless new_time > File.mtime(old)
    end
  end
  true
end