diff --git a/app/models/repository.rb b/app/models/repository.rb
index 88c729e83..abbeb47de 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -45,22 +45,31 @@ class Repository < ActiveRecord::Base
     end
   end
 
+  # Checks locking of sync
   def sync_locked?
     sync_actions :check
   end
 
+  # Uses for locking sync
+  # Calls from UI
   def lock_sync
     sync_actions :lock
   end
 
+  # Uses for unlocking sync
+  # Calls from UI
   def unlock_sync
     sync_actions :unlock
   end
 
+  # Uses for locking publishing
+  # Calls from API
   def start_sync
     sync_actions :lock, '.repo.lock'
   end
 
+  # Uses for unlocking publishing
+  # Calls from API
   def stop_sync
     sync_actions :unlock, '.repo.lock'
   end
@@ -98,9 +107,9 @@ class Repository < ActiveRecord::Base
       path = "#{platform.path}/repository/#{arch}/#{name}/#{lock_file}"
       case action
       when :lock
-        result ||= system 'touch', path
+        result ||= FileUtils.touch(path) rescue nil
       when :unlock
-        result ||= system 'rm', '-rf', path
+        result ||= FileUtils.rm_f(path)
       when :check
         return true if File.exist?(path)
       end
diff --git a/spec/models/repository_spec.rb b/spec/models/repository_spec.rb
index 35ea72a33..2af7684d4 100644
--- a/spec/models/repository_spec.rb
+++ b/spec/models/repository_spec.rb
@@ -30,6 +30,44 @@ describe Repository do
 
   end
 
+  context '#sync_locked?, #lock_sync, #unlock_sync, #start_sync, #stop_sync' do
+    let(:repository) { FactoryGirl.create(:repository) }
+    let(:path) { "#{repository.platform.path}/repository/SRPMS/#{repository.name}" }
+    before { FileUtils.mkdir_p path }
+
+    it 'ensures that #sync_locked? returns false if .sync.lock file does not exist' do
+      repository.sync_locked?.should be_false
+    end
+
+    it 'ensures that #sync_locked? returns true if .sync.lock file does exist' do
+      FileUtils.touch "#{path}/.sync.lock"
+      repository.sync_locked?.should be_true
+    end
+
+    it 'ensures that #lock_sync creates .sync.lock file' do
+      repository.lock_sync
+      File.exist?("#{path}/.sync.lock").should be_true
+    end
+
+    it 'ensures that #unlock_sync removes .sync.lock file' do
+      FileUtils.touch "#{path}/.sync.lock"
+      repository.unlock_sync
+      File.exist?("#{path}/.sync.lock").should be_false
+    end
+
+    it 'ensures that #start_sync creates .repo.lock file' do
+      repository.start_sync
+      File.exist?("#{path}/.repo.lock").should be_true
+    end
+
+    it 'ensures that #stop_sync removes .repo.lock file' do
+      FileUtils.touch "#{path}/.repo.lock"
+      repository.stop_sync
+      File.exist?("#{path}/.repo.lock").should be_false
+    end
+
+  end
+
   context 'when create with same owner that platform' do
     before do
       @platform = FactoryGirl.create(:platform)