Use Kernel#open to append lines to authorized_keys

lib/gitlab_keys.rb

@@ -29,9 +29,8 @@ class GitlabKeys
 
   def add_key
     $logger.info "Adding key #{@key_id} => #{@key.inspect}"
-    cmd = "command=\"#{ROOT_PATH}/bin/gitlab-shell #{@key_id}\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty #{@key}"
-    cmd = "echo \'#{cmd}\' >> #{auth_file}"
-    system(cmd)
+    auth_line = "command=\"#{ROOT_PATH}/bin/gitlab-shell #{@key_id}\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty #{@key}"
+    open(auth_file, 'a') { |file| file.puts(auth_line) }
   end
 
   def rm_key

spec/gitlab_keys_spec.rb

@@ -16,15 +16,18 @@ describe GitlabKeys do
 
   describe :add_key do
     let(:gitlab_keys) { build_gitlab_keys('add-key', 'key-741', 'ssh-rsa AAAAB3NzaDAxx2E') }
+    let(:file) { mock(:file) }
 
     it "should receive valid cmd" do
-      valid_cmd = "echo 'command=\"#{ROOT_PATH}/bin/gitlab-shell key-741\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty ssh-rsa AAAAB3NzaDAxx2E' >> #{GitlabConfig.new.auth_file}"
-      gitlab_keys.should_receive(:system).with(valid_cmd)
+      auth_line = "command=\"#{ROOT_PATH}/bin/gitlab-shell key-741\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty ssh-rsa AAAAB3NzaDAxx2E"
+      gitlab_keys.should_receive(:open).with(GitlabConfig.new.auth_file, 'a').and_yield(file)
+      file.should_receive(:puts).with(auth_line)
       gitlab_keys.send :add_key
     end
 
     it "should log an add-key event" do
       $logger.should_receive(:info).with('Adding key key-741 => "ssh-rsa AAAAB3NzaDAxx2E"')
+      gitlab_keys.stub(:open)
       gitlab_keys.send :add_key
     end
   end