From 9d20748c5c49e11ec02379b4f35c4a55dabe8399 Mon Sep 17 00:00:00 2001
From: Eugen Wissner <belka@caraus.de>
Date: Wed, 5 Jun 2024 11:34:23 +0200
Subject: [PATCH] Fix linking a zone info to localtime

---
 src/slack-timedate.cpp | 70 ++++++++++++++++--------------------------
 src/slack-timedate.h   |  8 ++---
 2 files changed, 30 insertions(+), 48 deletions(-)

diff --git a/src/slack-timedate.cpp b/src/slack-timedate.cpp
index b054ade..45b8e50 100644
--- a/src/slack-timedate.cpp
+++ b/src/slack-timedate.cpp
@@ -36,18 +36,18 @@ static void slack_method_call (GDBusConnection *connection, const gchar *sender,
 	// Set time zone
     if (g_strcmp0(method_name, "SetTimezone") == 0)
     {
-		g_variant_get (parameters, "(&sb)", &timezone, &user_interaction);
+		g_variant_get(parameters, "(&sb)", &timezone, &user_interaction);
+        std::error_code error_code;
 
-		if (slack_set_timezone(timezone))
+		if (timedate1->set_timezone(timezone, error_code))
         {
-            g_dbus_method_invocation_return_value (invocation, NULL);
+            g_dbus_method_invocation_return_value(invocation, NULL);
         }
 		else
         {
-            g_dbus_method_invocation_return_error (invocation,
-				G_IO_ERROR,
-				G_IO_ERROR_FAILED,
-				"Write operation failed");
+            g_dbus_method_invocation_return_error(invocation, G_IO_ERROR, G_IO_ERROR_FAILED,
+				"Set time zone: %s",
+                error_code ? error_code.message().c_str() : "Zone info is not a regular file");
         }
 		g_free (timezone);
     }
@@ -181,23 +181,20 @@ namespace dlackware::timedate
 {
     void timedate1::list_timezones(const std::string& prefix, std::vector<Glib::ustring>& accumulator)
     {
-        constexpr Glib::FileTest is_directory = Glib::FILE_TEST_IS_DIR;
-        constexpr Glib::FileTest is_regular = Glib::FILE_TEST_IS_REGULAR;
         auto zoneinfo_path = std::filesystem::path(zoneinfo_database) / prefix;
-        auto zoneinfo_directory = Glib::Dir(zoneinfo_path);
 
-        for (auto zoneinfo_entry : zoneinfo_directory)
+        for (auto zoneinfo_entry : std::filesystem::directory_iterator(zoneinfo_path))
         {
-            auto entry_path = zoneinfo_path / zoneinfo_entry;
+            auto new_prefix = prefix + zoneinfo_entry.path().filename().string();
 
-            if (Glib::file_test(entry_path, is_directory))
+            if (zoneinfo_entry.is_directory())
             {
-                list_timezones(prefix + zoneinfo_entry + "/", accumulator);
+                list_timezones(new_prefix + "/", accumulator);
             }
-            else if (Glib::file_test(entry_path, is_regular) && !entry_path.has_extension()
-                    && zoneinfo_entry != "leapseconds")
+            else if (zoneinfo_entry.is_regular_file() && !zoneinfo_entry.path().has_extension()
+                    && zoneinfo_entry.path().filename() != "leapseconds")
             {
-                accumulator.push_back(prefix + zoneinfo_entry);
+                accumulator.emplace_back(new_prefix);
             }
         }
     }
@@ -221,38 +218,23 @@ namespace dlackware::timedate
         }
         return Glib::ustring{ zone_copied_from.get() + strlen(zoneinfo_database) + 1 };
     }
-}
 
-gboolean slack_set_timezone (gchar *zone) {
-	gchar *zone_file;
-	GFile *etc_localtime, *localtime_link, *g_zone_file;
-
-	zone_file = g_strconcat ("/usr/share/zoneinfo/", zone, NULL);
-	if (Glib::file_test(zone_file, Glib::FILE_TEST_IS_REGULAR))
+    bool timedate1::set_timezone(gchar *zone, std::error_code& ec)
     {
-		etc_localtime = g_file_new_for_path ("/etc/localtime");
-		localtime_link = g_file_new_for_path ("/etc/localtime-copied-from");
-		g_zone_file = g_file_new_for_path (zone_file);
+        ec.clear();
+        auto zone_file = std::filesystem::path("/usr/share/zoneinfo") / zone;
 
-		if (!g_file_copy (g_zone_file, etc_localtime, G_FILE_COPY_OVERWRITE, NULL, NULL, NULL, NULL)) {
-			return FALSE;
-		}
+        if (!std::filesystem::is_regular_file(zone_file, ec) || ec)
+        {
+            return false;
+        }
+        std::filesystem::path etc_localtime = "/etc/localtime";
 
-		if (!g_file_delete (localtime_link, NULL, NULL)) {
-			return FALSE;
-		}
-		if (!g_file_make_symbolic_link (localtime_link, zone_file, NULL, NULL)) {
-			return FALSE;
-		}
+        std::filesystem::remove(etc_localtime);
+        std::filesystem::create_symlink(zone_file, etc_localtime, ec);
 
-		g_free (zone_file);
-		g_object_unref (etc_localtime);
-		g_object_unref (localtime_link);
-		g_object_unref (g_zone_file);
-
-        return true;
-	}
-    return false;
+        return !ec;
+    }
 }
 
 gboolean slack_set_time(gint64 seconds_since_epoch, gboolean relative)
diff --git a/src/slack-timedate.h b/src/slack-timedate.h
index c80cbf2..2f8229f 100644
--- a/src/slack-timedate.h
+++ b/src/slack-timedate.h
@@ -73,13 +73,13 @@ namespace dlackware::timedate
 
         // Returns the system time zone.
         Glib::ustring timezone();
+
+        // Sets the system time zone to the one passed by the argument
+        // Returns true on success, false otherwise
+        bool set_timezone(gchar *, std::error_code& ec);
     };
 }
 
-// Sets the system time zone to the one passed by the argument
-// Returns true on success, false otherwise
-gboolean slack_set_timezone (gchar *);
-
 // Changes the date/time
 // Takes the amount of seconds since UNIX epoche and 
 // Returns true on success, false otherwise