Module: Puppet::Util::SymbolicFileMode

Included in:
Transaction::Report::Json, Transaction::Report::Yaml, Puppet::Util
Defined in:
lib/puppet/util/symbolic_file_mode.rb

Constant Summary collapse

SetUIDBit = 
ReadBit  = 4
SetGIDBit = 
WriteBit = 2
StickyBit = 
ExecBit  = 1
SymbolicMode = 
{ 'x' => ExecBit, 'w' => WriteBit, 'r' => ReadBit }
SymbolicSpecialToBit = 
{
  't' => { 'u' => StickyBit, 'g' => StickyBit, 'o' => StickyBit },
  's' => { 'u' => SetUIDBit, 'g' => SetGIDBit, 'o' => StickyBit }
}

Instance Method Summary collapse

Instance Method Details

#display_mode(value) ⇒ Object 



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# File 'lib/puppet/util/symbolic_file_mode.rb', line 25

def display_mode(value)
  if value =~ /^0?[0-7]{1,4}$/
    value.rjust(4, "0")
  else
    value
  end
end

#normalize_symbolic_mode(value) ⇒ Object 



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# File 'lib/puppet/util/symbolic_file_mode.rb', line 33

def normalize_symbolic_mode(value)
  return nil if value.nil?

  # We need to treat integers as octal numbers.
  #
  # "A numeric mode is from one to four octal digits (0-7), derived by adding
  # up the bits with values 4, 2, and 1. Omitted digits are assumed to be
  # leading zeros."
  case value
  when Numeric
    value.to_s(8)
  when /^0?[0-7]{1,4}$/
    value.to_i(8).to_s(8) # strip leading 0's
  else
    value
  end
end

#symbolic_mode_to_int(modification, to_mode = 0, is_a_directory = false) ⇒ Object 



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# File 'lib/puppet/util/symbolic_file_mode.rb', line 51

def symbolic_mode_to_int(modification, to_mode = 0, is_a_directory = false)
  if modification.nil? or modification == ''
    raise Puppet::Error, _("An empty mode string is illegal")
  elsif modification =~ /^[0-7]+$/
    return modification.to_i(8)
  elsif modification =~ /^\d+$/
    raise Puppet::Error, _("Numeric modes must be in octal, not decimal!")
  end

  fail _("non-numeric current mode (%{mode})") % { mode: to_mode.inspect } unless to_mode.is_a?(Numeric)

  original_mode = {
    's' => (to_mode & 0o7000) >> 9,
    'u' => (to_mode & 0o0700) >> 6,
    'g' => (to_mode & 0o0070) >> 3,
    'o' => (to_mode & 0o0007) >> 0,
    # Are there any execute bits set in the original mode?
    'any x?' => (to_mode & 0o0111) != 0
  }
  final_mode = {
    's' => original_mode['s'],
    'u' => original_mode['u'],
    'g' => original_mode['g'],
    'o' => original_mode['o'],
  }

  modification.split(/\s*,\s*/).each do |part|
    _, to, dsl = /^([ugoa]*)([-+=].*)$/.match(part).to_a
    if dsl.nil? then raise Puppet::Error, _('Missing action') end

    to = "a" unless to and to.length > 0

    # We want a snapshot of the mode before we start messing with it to
    # make actions like 'a-g' atomic.  Various parts of the DSL refer to
    # the original mode, the final mode, or the current snapshot of the
    # mode, for added fun.
    snapshot_mode = {}
    final_mode.each { |k, v| snapshot_mode[k] = v }

    to.gsub('a', 'ugo').split('').uniq.each do |who|
      value = snapshot_mode[who]

      action = '!'
      actions = {
        '!' => ->(_, _) { raise Puppet::Error, _('Missing operation (-, =, or +)') },
        '=' => ->(m, v) { m | v },
        '+' => ->(m, v) { m | v },
        '-' => ->(m, v) { m & ~v },
      }

      dsl.split('').each do |op|
        case op
        when /[-+=]/
          action = op
          # Clear all bits, if this is assignment
          value  = 0 if op == '='

        when /[ugo]/
          value = actions[action].call(value, snapshot_mode[op])

        when /[rwx]/
          value = actions[action].call(value, SymbolicMode[op])

        when 'X'
          # Only meaningful in combination with "set" actions.
          if action != '+'
            raise Puppet::Error, _("X only works with the '+' operator")
          end

          # As per the BSD manual page, set if this is a directory, or if
          # any execute bit is set on the original (unmodified) mode.
          # Ignored otherwise; it is "add if", not "add or clear".
          if is_a_directory or original_mode['any x?']
            value = actions[action].call(value, ExecBit)
          end

        when /[st]/
          bit = SymbolicSpecialToBit[op][who] or fail _("internal error")
          final_mode['s'] = actions[action].call(final_mode['s'], bit)

        else
          raise Puppet::Error, _('Unknown operation')
        end
      end

      # Now, assign back the value.
      final_mode[who] = value
    end
  rescue Puppet::Error => e
    if part.inspect != modification.inspect
      rest = " at #{part.inspect}"
    else
      rest = ''
    end

    raise Puppet::Error, _("%{error}%{rest} in symbolic mode %{modification}") % { error: e, rest: rest, modification: modification.inspect }, e.backtrace
  end

  final_mode['s'] << 9 |
    final_mode['u'] << 6 |
    final_mode['g'] << 3 |
    final_mode['o'] << 0
end

#valid_symbolic_mode?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/util/symbolic_file_mode.rb', line 17

def valid_symbolic_mode?(value)
  value = normalize_symbolic_mode(value)
  return true if value =~ /^0?[0-7]{1,4}$/
  return true if value =~ /^([ugoa]*[-=+][-=+rstwxXugo]*)(,[ugoa]*[-=+][-=+rstwxXugo]*)*$/

  false
end