Check for duplicate content and log it

resources/bashrc_manager.rb

@@ -9,20 +9,28 @@
 action_class do
   require 'etc'
 
-  def group_gid
-    Etc.getpwnam(new_resource.user).gid
-  end
-
-  def initial_config?
-    ::File.directory?(bashrc_d)
+  def bashrc
+    ::File.join(::Dir.home(new_resource.user), '.bashrc')
   end
 
   def bashrc_d
     ::File.join(::Dir.home(new_resource.user), '.bashrc.d')
   end
 
-  def bashrc
-    ::File.join(::Dir.home(new_resource.user), '.bashrc')
+  def bashrc_init
+    ::File.join(bashrc_d, 'init')
+  end
+
+  def duplicate_content?(filename)
+    return ::IO.read(filename).downcase.include?(new_resource.content) if ::File.exist? filename
+  end
+
+  def group_gid
+    Etc.getpwnam(new_resource.user).gid
+  end
+
+  def initial_config?
+    ::File.directory?(bashrc_d)
   end
 end
 
@@ -33,14 +41,14 @@ def bashrc
     mode 0o755
   end
 
-  file ::File.join(bashrc_d, 'init') do
-    if ::File.exist?(::File.join(bashrc))
-      content ::IO.read(::File.join(bashrc))
+  file bashrc_init do
+    if ::File.exist?(bashrc)
+      content ::IO.read(bashrc)
     else
       action :touch
     end
     mode 0o444
-    not_if { ::File.exist?(::File.join(bashrc_d, 'init')) }
+    not_if { ::File.exist?(bashrc_init) }
   end
 
   cookbook_file bashrc do
@@ -60,6 +68,12 @@ def bashrc
     group group_gid
     mode 0o644
   end
+
+  log "bashrc_manager_#{new_resource.filename}" do
+    level :warn
+    message "bashrc_manager: #{new_resource.filename} adds duplicate content."
+    only_if { duplicate_content?(bashrc) || duplicate_content?(bashrc_init) }
+  end
 end
 
 action :remove do

spec/bashrc_manager_spec.rb

@@ -7,6 +7,13 @@
     ChefSpec::ServerRunner.new(step_into: ['bashrc_manager'])
   end
 
+  let(:test1_content) do
+    <<-TXT
+# Managed by Chef.  Local changes will be overwritten.
+test1
+    TXT
+  end
+
   before do
     pw_user = EtcPwnam.new
     pw_user.name = 'test_user'
@@ -20,12 +27,14 @@
   end
 
   context 'action create' do
+    before do
+      allow(File).to receive(:exist?).and_call_original
+      allow(IO).to receive(:read).and_call_original
+    end
+
     context 'init' do
       context 'default' do
         before do
-          allow(File).to receive(:exist?).and_call_original
-          allow(IO).to receive(:read).and_call_original
-
           allow(File).to receive(:exist?).with('/home/test_user/.bashrc').and_return(true)
           allow(File).to receive(:exist?).with('/home/test_user/.bashrc.d/init').and_return(false)
           allow(IO).to receive(:read).with('/home/test_user/.bashrc').and_return('')
@@ -67,10 +76,27 @@
 
       it 'append chef warning to .bashrc.d/test1 file' do
         expect(chef_run).to render_file('/home/test_user/.bashrc.d/test1')
-          .with_content <<-TXT
-# Managed by Chef.  Local changes will be overwritten.
-test1
-          TXT
+          .with_content(test1_content)
+      end
+
+      it 'not log warning' do
+        expect(chef_run).not_to write_log('bashrc_manager_test1')
+      end
+    end
+
+    context 'log' do
+      before do
+        allow(File).to receive(:exist?).with('/home/test_user/.bashrc').and_return(true)
+        allow(File).to receive(:exist?).with('/home/test_user/.bashrc.d/init').and_return(true)
+        allow(IO).to receive(:read).with('/home/test_user/.bashrc').and_return('')
+        allow(IO).to receive(:read)
+          .with('/home/test_user/.bashrc.d/init')
+          .and_return(test1_content)
+        chef_run.converge described_recipe
+      end
+
+      it 'warning' do
+        expect(chef_run).to write_log('bashrc_manager_test1').with(level: :warn)
       end
     end
   end