Fix file uninstallation and add a test

Prepend the install directory to the file path specified in the
<uninstall> section of the XML file to get the path of the file
to remove.

If the file cannot be uninstalled because it does not exist,
log a warning and continue.

src/UpdateInstaller.cpp

@@ -228,7 +228,15 @@ void UpdateInstaller::uninstallFiles()
 	std::vector<std::string>::const_iterator iter = m_script->filesToUninstall().begin();
 	for (;iter != m_script->filesToUninstall().end();iter++)
 	{
-		FileOps::removeFile(iter->c_str());
+		std::string path = m_installDir + '/' + iter->c_str();
+		if (FileOps::fileExists(path.c_str()))
+		{
+			FileOps::removeFile(path.c_str());
+		}
+		else
+		{
+			LOG(Warn,"Unable to uninstall file " + path + " because it does not exist.");
+		}
 	}
 }
 

src/tests/file_list.xml

@@ -31,5 +31,6 @@
  </install>
  <uninstall>
   <!-- TODO - List some files to uninstall here !-->
+  <file>file-to-uninstall.txt</file>
  </uninstall>
 </update>

src/tests/test-update.rb

@@ -14,6 +14,12 @@ FileUtils.rm_rf(PACKAGE_DIR)
 Dir.mkdir(INSTALL_DIR)
 FileUtils.cp("oldapp","#{INSTALL_DIR}/app")
 
+# Create a dummy file to uninstall
+uninstall_test_file = "#{INSTALL_DIR}/file-to-uninstall.txt"
+File.open(uninstall_test_file,"w") do |file|
+	file.puts "this file should be removed after the update"
+end
+
 # Create the update archive containing the new app
 Dir.mkdir(PACKAGE_DIR)
 FileUtils.cp("newapp","#{PACKAGE_DIR}/app")
@@ -33,11 +39,11 @@ sleep(1)
 
 # Check that the app was updated
 output = `#{INSTALL_DIR}/app`
-if (output.strip == "new app starting")
-	puts "Updated app produced expected output"
-	exit(0)
-else
-	puts "Updated app produced unexpected output: #{output}"
-	exit(1)
+if (output.strip != "new app starting")
+	throw "Updated app produced unexpected output: #{output}"
+end
+
+if (File.exist?(uninstall_test_file))
+	throw "File to uninstall was not removed"
 end