implement #11017 - make file_line type ensurable

* Implement a simple destroy method.
* Add tests for it
* Refactor code, so file is actually read only once. However, due
  to the nature how provider tests are run, we need to ensure that
  the file is read before we open it to write it.

1 files changed, 13 insertions, 1 deletions

diff --git a/lib/puppet/provider/file_line/ruby.rb b/lib/puppet/provider/file_line/ruby.rb
index 63bbd8e..f5d3a32 100644
--- a/lib/puppet/provider/file_line/ruby.rb
+++ b/lib/puppet/provider/file_line/ruby.rb
@@ -1,7 +1,7 @@
 Puppet::Type.type(:file_line).provide(:ruby) do
 
   def exists?
-    File.readlines(resource[:path]).find do |line|
+    lines.find do |line|
       line.chomp == resource[:line].chomp
     end
   end
@@ -12,4 +12,16 @@ Puppet::Type.type(:file_line).provide(:ruby) do
     end
   end
 
+  def destroy
+    local_lines = lines
+    File.open(resource[:path],'w') do |fh|
+      fh.write(local_lines.reject{|l| l.chomp == resource[:line] }.join(''))
+    end
+  end
+
+  private
+  def lines
+    @lines ||= File.readlines(resource[:path])
+  end
+
 end