3rdparty/modules/stdlib/lib/puppet/provider/file_line/ruby.rb

   1 Puppet::Type.type(:file_line).provide(:ruby) do
   2   def exists?
   3     found = false
   4     lines_count = 0
   5     lines.each do |line|
   6       found = line.chomp == resource[:line]
   7       if found
   8         lines_count += 1
   9       end
  10     end
  11     return found = lines_count > 0 if resource[:match].nil?
  12
  13     match_count = count_matches(new_match_regex)
  14     found = if resource[:ensure] == :present
  15               if match_count.zero?
  16                 if lines_count.zero? && resource[:append_on_no_match].to_s == 'false'
  17                   true # lies, but gets the job done
  18                 elsif lines_count.zero? && resource[:append_on_no_match].to_s != 'false'
  19                   false
  20                 else
  21                   true
  22                 end
  23               elsif resource[:replace_all_matches_not_matching_line].to_s == 'true'
  24                 false # maybe lies, but knows there's still work to do
  25               elsif lines_count.zero?
  26                 resource[:replace].to_s == 'false'
  27               else
  28                 true
  29               end
  30             elsif match_count.zero?
  31               if lines_count.zero?
  32                 false
  33               else
  34                 true
  35               end
  36             elsif lines_count.zero?
  37               resource[:match_for_absence].to_s == 'true'
  38             else
  39               true
  40             end
  41   end
  42
  43   def create
  44     return if resource[:replace].to_s != 'true' && count_matches(new_match_regex) > 0
  45     if resource[:match]
  46       handle_create_with_match
  47     elsif resource[:after]
  48       handle_create_with_after
  49     else
  50       handle_append_line
  51     end
  52   end
  53
  54   def destroy
  55     if resource[:match_for_absence].to_s == 'true' && resource[:match]
  56       handle_destroy_with_match
  57     else
  58       handle_destroy_line
  59     end
  60   end
  61
  62   private
  63
  64   def lines
  65     # If this type is ever used with very large files, we should
  66     #  write this in a different way, using a temp
  67     #  file; for now assuming that this type is only used on
  68     #  small-ish config files that can fit into memory without
  69     #  too much trouble.
  70
  71     @lines ||= File.readlines(resource[:path], :encoding => resource[:encoding])
  72   rescue TypeError => _e
  73     # Ruby 1.8 doesn't support open_args
  74     @lines ||= File.readlines(resource[:path])
  75   end
  76
  77   def new_after_regex
  78     resource[:after] ? Regexp.new(resource[:after]) : nil
  79   end
  80
  81   def new_match_regex
  82     resource[:match] ? Regexp.new(resource[:match]) : nil
  83   end
  84
  85   def count_matches(regex)
  86     lines.select { |line|
  87       if resource[:replace_all_matches_not_matching_line].to_s == 'true'
  88         line.match(regex) unless line.chomp == resource[:line]
  89       else
  90         line.match(regex)
  91       end
  92     }.size
  93   end
  94
  95   def handle_create_with_match
  96     after_regex = new_after_regex
  97     match_regex = new_match_regex
  98     match_count = count_matches(new_match_regex)
  99
 100     if match_count > 1 && resource[:multiple].to_s != 'true'
 101       raise Puppet::Error, "More than one line in file '#{resource[:path]}' matches pattern '#{resource[:match]}'"
 102     end
 103
 104     File.open(resource[:path], 'w') do |fh|
 105       lines.each do |line|
 106         fh.puts(match_regex.match(line) ? resource[:line] : line)
 107         next unless match_count.zero? && after_regex
 108         if after_regex.match(line)
 109           fh.puts(resource[:line])
 110           match_count += 1 # Increment match_count to indicate that the new line has been inserted.
 111         end
 112       end
 113
 114       if match_count.zero?
 115         fh.puts(resource[:line])
 116       end
 117     end
 118   end
 119
 120   def handle_create_with_after
 121     after_regex = new_after_regex
 122     after_count = count_matches(after_regex)
 123
 124     if after_count > 1 && resource[:multiple].to_s != 'true'
 125       raise Puppet::Error, "#{after_count} lines match pattern '#{resource[:after]}' in file '#{resource[:path]}'. One or no line must match the pattern."
 126     end
 127
 128     File.open(resource[:path], 'w') do |fh|
 129       lines.each do |line|
 130         fh.puts(line)
 131         if after_regex.match(line)
 132           fh.puts(resource[:line])
 133         end
 134       end
 135
 136       if after_count.zero?
 137         fh.puts(resource[:line])
 138       end
 139     end
 140   end
 141
 142   def handle_destroy_with_match
 143     match_regex = new_match_regex
 144     match_count = count_matches(match_regex)
 145     if match_count > 1 && resource[:multiple].to_s != 'true'
 146       raise Puppet::Error, "More than one line in file '#{resource[:path]}' matches pattern '#{resource[:match]}'"
 147     end
 148
 149     local_lines = lines
 150     File.open(resource[:path], 'w') do |fh|
 151       fh.write(local_lines.reject { |line| match_regex.match(line) }.join(''))
 152     end
 153   end
 154
 155   def handle_destroy_line
 156     local_lines = lines
 157     File.open(resource[:path], 'w') do |fh|
 158       fh.write(local_lines.reject { |line| line.chomp == resource[:line] }.join(''))
 159     end
 160   end
 161
 162   def handle_append_line
 163     local_lines = lines
 164     File.open(resource[:path], 'w') do |fh|
 165       local_lines.each do |line|
 166         fh.puts(line)
 167       end
 168       fh.puts(resource[:line])
 169     end
 170   end
 171 end