Module: Puppet::Util::SymbolicFileMode

Included in:
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

#normalize_symbolic_mode(value) ⇒ Object


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# File 'lib/puppet/util/symbolic_file_mode.rb', line 22

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

  # We need to treat integers as octal numbers.
  if value.is_a? Numeric then
    return value.to_s(8)
  elsif value =~ /^0?[0-7]{1,4}$/ then
    return value.to_i(8).to_s(8)
  else
    return 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 35

def symbolic_mode_to_int(modification, to_mode = 0, is_a_directory = false)
  if modification.nil? or modification == '' then
    raise Puppet::Error, _("An empty mode string is illegal")
  end
  if modification =~ /^[0-7]+$/ then return modification.to_i(8) end
  if modification =~ /^\d+$/ then
    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 & 07000) >> 9,
    'u' => (to_mode & 00700) >> 6,
    'g' => (to_mode & 00070) >> 3,
    'o' => (to_mode & 00007) >> 0,
    # Are there any execute bits set in the original mode?
    'any x?' => (to_mode & 00111) != 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|
    begin
      _, 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 = {
          '!' => lambda {|_,_| raise Puppet::Error, _('Missing operation (-, =, or +)') },
          '=' => lambda {|m,v| m | v },
          '+' => lambda {|m,v| m | v },
          '-' => lambda {|m,v| m & ~v },
        }

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

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

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

          when 'X' then
            # Only meaningful in combination with "set" actions.
            if action != '+' then
              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?'] then
              value = actions[action].call(value, ExecBit)
            end

          when /[st]/ then
            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 then
        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
  end

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

#valid_symbolic_mode?(value) ⇒ Boolean


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# File 'lib/puppet/util/symbolic_file_mode.rb', line 15

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