1 files changed, 34 insertions, 2 deletions
diff --git a/lib/puppet/provider/file_line/ruby.rb b/lib/puppet/provider/file_line/ruby.rb
index f5d3a32..e21eaa8 100644
--- a/lib/puppet/provider/file_line/ruby.rb
+++ b/lib/puppet/provider/file_line/ruby.rb
@@ -1,3 +1,4 @@
+
 Puppet::Type.type(:file_line).provide(:ruby) do
 
   def exists?
@@ -7,8 +8,10 @@ Puppet::Type.type(:file_line).provide(:ruby) do
   end
 
   def create
-    File.open(resource[:path], 'a') do |fh|
-      fh.puts resource[:line]
+    if resource[:match]
+      handle_create_with_match()
+    else
+      handle_create_without_match()
     end
   end
 
@@ -21,7 +24,36 @@ Puppet::Type.type(:file_line).provide(:ruby) do
 
   private
   def lines
+    # If this type is ever used with very large files, we should
+    #  write this in a different way, using a temp
+    #  file; for now assuming that this type is only used on
+    #  small-ish config files that can fit into memory without
+    #  too much trouble.
     @lines ||= File.readlines(resource[:path])
   end
 
+  def handle_create_with_match()
+    regex = resource[:match] ? Regexp.new(resource[:match]) : nil
+    match_count = lines.select { |l| regex.match(l) }.count
+    if match_count > 1
+      raise Puppet::Error, "More than one line in file '#{resource[:path]}' matches pattern '#{resource[:match]}'"
+    end
+    File.open(resource[:path], 'w') do |fh|
+      lines.each do |l|
+        fh.puts(regex.match(l) ? resource[:line] : l)
+      end
+
+      if (match_count == 0)
+        fh.puts(resource[:line])
+      end
+    end
+  end
+
+  def handle_create_without_match
+    File.open(resource[:path], 'a') do |fh|
+      fh.puts resource[:line]
+    end
+  end
+
+
 end