tests: replace tmpnam use

Fixes #2675

tests/acceptance-tests/server_configuration_options.cpp

@@ -18,6 +18,8 @@
 
 #include "mir/options/option.h"
 
+#include "mir/test/file_utils.h"
+
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
 
@@ -29,15 +31,6 @@ using namespace testing;
 
 namespace
 {
-std::string create_temp_dir()
-{
-    char temp_dir[] = "temp_dir_XXXXXX";
-    if (mkdtemp(temp_dir) == nullptr)
-        throw std::system_error(errno, std::system_category(), "Failed to create temp dir");
-
-    return temp_dir;
-}
-
 struct ServerConfigurationOptions : mir_test_framework::HeadlessTest
 {
     MOCK_METHOD(void, command_line_handler, (std::vector<std::string> const&));
@@ -102,7 +95,7 @@ struct ServerConfigurationOptions : mir_test_framework::HeadlessTest
         remove(temp_dir.c_str());
     }
 
-    std::string const temp_dir = create_temp_dir();
+    std::string const temp_dir = mir::test::create_temp_dir();
     std::string const fake_xdg_config_home = temp_dir + "/fake_xdg_config_home";
     std::string const fake_home = temp_dir + "/fake_home";
     std::string const fake_home_config = temp_dir + "/fake_home/.config";

tests/include/mir/test/file_utils.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright © Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or 3 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MIR_TEST_FILE_UTILS_H_
+#define MIR_TEST_FILE_UTILS_H_
+
+namespace mir
+{
+namespace test
+{
+std::string create_temp_file();
+std::string create_temp_dir();
+}
+}
+
+#endif // MIR_TEST_FILE_UTILS_H_

tests/mir_test/CMakeLists.txt

@@ -9,6 +9,7 @@ add_library(mir-public-test OBJECT
   display_config_matchers.cpp
   event_factory.cpp
   event_matchers.cpp
+  file_utils.cpp
   pipe.cpp
   popen.cpp
   signal.cpp

tests/mir_test/file_utils.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright © Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or 3 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <system_error>
+#include <unistd.h>
+
+#include "mir/test/file_utils.h"
+
+std::string mir::test::create_temp_file()
+{
+    char temp_file[] = "temp_XXXXXX";
+    if (int fd = mkstemp(temp_file) == -1)
+    {
+        throw std::system_error(errno, std::system_category(), "Failed to create temp file");
+    }
+    else
+    {
+        close(fd);
+    }
+
+    return temp_file;
+}
+
+std::string mir::test::create_temp_dir()
+{
+    char temp_dir[] = "temp_dir_XXXXXX";
+    if (mkdtemp(temp_dir) == nullptr)
+        throw std::system_error(errno, std::system_category(), "Failed to create temp dir");
+
+    return temp_dir;
+}

tests/miral/external_client.cpp

@@ -18,6 +18,8 @@
 #include <miral/external_client.h>
 #include <miral/x11_support.h>
 
+#include "mir/test/file_utils.h"
+
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
 #include <fstream>
@@ -43,7 +45,7 @@ struct ExternalClient : miral::TestServer
     miral::X11Support x11_disabled_by_default{};
     miral::X11Support x11_enabled_by_default{miral::X11Support{}.default_to_enabled()};
 
-    std::string const output = tmpnam(nullptr);
+    std::string const output = mir::test::create_temp_file();
 
     auto client_env_value(std::string const& key) const -> std::string
     {

tests/miral/static_display_config.cpp

@@ -19,6 +19,7 @@
 #include "mir/logging/logger.h"
 
 #include <mir/test/doubles/mock_display_configuration.h>
+#include "mir/test/file_utils.h"
 
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>
@@ -151,7 +152,9 @@ struct StaticDisplayConfig : Test
 
 TEST_F(StaticDisplayConfig, nonexistent_config_file_is_no_error)
 {
-    miral::StaticDisplayConfig{tmpnam(nullptr)};
+    auto filename = mir::test::create_temp_file();
+    unlink(filename.c_str());
+    miral::StaticDisplayConfig{filename};
 }
 
 TEST_F(StaticDisplayConfig, empty_config_input_causes_AbnormalExit)

tests/unit-tests/frontend_wayland/test_desktop_file_manager.cpp

@@ -19,6 +19,7 @@
 #include "mir/test/doubles/mock_scene_session.h"
 #include "mir/scene/surface_observer.h"
 #include "mir/test/doubles/explicit_executor.h"
+#include "mir/test/file_utils.h"
 #include "mir_test_framework/open_wrapper.h"
 
 #include <filesystem>
@@ -194,7 +195,7 @@ TEST_F(DesktopFileManager, can_resolve_from_valid_flatpak_info)
     std::stringstream flatpak_info_path;
     flatpak_info_path << "/proc/" << PID << "/root/.flatpak-info";
     auto const flatpak_info = flatpak_info_path.str();
-    auto tmp_file_name = std::tmpnam(NULL);
+    auto tmp_file_name = mir::test::create_temp_file().c_str();
     {
         std::ofstream tmp_file;
         tmp_file.open(tmp_file_name);
@@ -228,7 +229,7 @@ TEST_F(DesktopFileManager, app_id_will_not_resolve_from_flatpak_info_when_name_i
     std::stringstream flatpak_info_path;
     flatpak_info_path << "/proc/" << PID << "/root/.flatpak-info";
     auto const flatpak_info = flatpak_info_path.str();
-    auto tmp_file_name = std::tmpnam(NULL);
+    auto tmp_file_name = mir::test::create_temp_file().c_str();
     {
         std::ofstream tmp_file;
         tmp_file.open(tmp_file_name);

tests/unit-tests/frontend_wayland/test_g_desktop_file_cache.cpp

@@ -18,6 +18,7 @@
 
 #include "src/server/frontend_wayland/foreign_toplevel_manager_v1.h"
 #include "mir/test/doubles/stub_main_loop.h"
+#include "mir/test/file_utils.h"
 #include <fstream>
 
 #include <gmock/gmock.h>
@@ -43,9 +44,7 @@ struct GDesktopFileCache : Test
     static void SetUpTestSuite()
     {
         // Establish the temporary directory
-        std::filesystem::path tmp_dir_path {std::filesystem::temp_directory_path() /= std::tmpnam(nullptr)};
-        std::filesystem::create_directories(tmp_dir_path);
-        std::string desktop_file_directory_name = tmp_dir_path;
+        std::string desktop_file_directory_name = mir::test::create_temp_dir();
         setenv("XDG_DATA_DIRS", desktop_file_directory_name.c_str(), 1);
         applications_dir = desktop_file_directory_name + "/applications";
         mkdir(applications_dir.c_str(), S_IRWXU);