all: Specify the schema source when constructing any GSettings

Specify the GSettingsSchemaSource to use when constructing a GSettings
object. Due to https://gitlab.gnome.org/GNOME/glib/-/issues/1884 this
neccessitates not using g_settings_get_child() to construct a child
setting, but instead to construct the child GSettings directly.

In preparation for the next commit.

12 files changed, 184 insertions, 60 deletions

diff --git a/src/terminal-app.cc b/src/terminal-app.cc
index 125fcf7c..3f456a2e 100644
--- a/src/terminal-app.cc
+++ b/src/terminal-app.cc
@@ -32,6 +32,7 @@
 #include "terminal-debug.hh"
 #include "terminal-app.hh"
 #include "terminal-accels.hh"
+#include "terminal-client-utils.hh"
 #include "terminal-screen.hh"
 #include "terminal-screen-container.hh"
 #include "terminal-window.hh"
@@ -61,6 +62,10 @@
 #define DESKTOP_INTERFACE_SETTINGS_SCHEMA       "org.gnome.desktop.interface"
 
 #define SYSTEM_PROXY_SETTINGS_SCHEMA            "org.gnome.system.proxy"
+#define SYSTEM_HTTP_PROXY_SETTINGS_SCHEMA       "org.gnome.system.proxy.http"
+#define SYSTEM_HTTPS_PROXY_SETTINGS_SCHEMA      "org.gnome.system.proxy.https"
+#define SYSTEM_FTP_PROXY_SETTINGS_SCHEMA        "org.gnome.system.proxy.ftp"
+#define SYSTEM_SOCKS_PROXY_SETTINGS_SCHEMA      "org.gnome.system.proxy.socks"
 
 #define GTK_SETTING_PREFER_DARK_THEME           "gtk-application-prefer-dark-theme"
 
@@ -98,9 +103,11 @@ struct _TerminalApp
 
   GHashTable *screen_map;
 
+  GSettingsSchemaSource* schema_source;
   GSettings *global_settings;
   GSettings *desktop_interface_settings;
   GSettings *system_proxy_settings;
+  GSettings* system_proxy_protocol_settings[4];
   GSettings *gtk_debug_settings;
 
 #ifdef ENABLE_SEARCH_PROVIDER
@@ -803,19 +810,45 @@ terminal_app_init (TerminalApp *app)
 
   gtk_window_set_default_icon_name (GNOME_TERMINAL_ICON_NAME);
 
+  app->schema_source = g_settings_schema_source_get_default();
+
   /* Desktop proxy settings */
-  app->system_proxy_settings = g_settings_new (SYSTEM_PROXY_SETTINGS_SCHEMA);
+  app->system_proxy_settings = terminal_g_settings_new(app->schema_source,
+                                                       SYSTEM_PROXY_SETTINGS_SCHEMA);
+
+  /* Since there is no way to get the schema ID of a child schema, we cannot
+   * verify that the installed schemas are correct. Also, due to a glib bug
+   * (https://gitlab.gnome.org/GNOME/glib/-/issues/1884) g_settings_get_child()
+   * doesn't work with non-default schema sources.
+   * So instead of using g_settings_get_child() on the SYSTEM_PROXY_SETTINGS_SCHEMA,
+   * we construct the child GSettings directly.
+   */
+  app->system_proxy_protocol_settings[TERMINAL_PROXY_HTTP] =
+    terminal_g_settings_new(app->schema_source,
+                            SYSTEM_HTTP_PROXY_SETTINGS_SCHEMA);
+  app->system_proxy_protocol_settings[TERMINAL_PROXY_HTTPS] =
+    terminal_g_settings_new(app->schema_source,
+                            SYSTEM_HTTPS_PROXY_SETTINGS_SCHEMA);
+  app->system_proxy_protocol_settings[TERMINAL_PROXY_FTP] =
+    terminal_g_settings_new(app->schema_source,
+                            SYSTEM_FTP_PROXY_SETTINGS_SCHEMA);
+  app->system_proxy_protocol_settings[TERMINAL_PROXY_SOCKS] =
+    terminal_g_settings_new(app->schema_source,
+                            SYSTEM_SOCKS_PROXY_SETTINGS_SCHEMA);
 
   /* Desktop Interface settings */
-  app->desktop_interface_settings = g_settings_new (DESKTOP_INTERFACE_SETTINGS_SCHEMA);
+  app->desktop_interface_settings = terminal_g_settings_new(app->schema_source,
+                                                            DESKTOP_INTERFACE_SETTINGS_SCHEMA);
 
   /* Terminal global settings */
-  app->global_settings = g_settings_new (TERMINAL_SETTING_SCHEMA);
+  app->global_settings = terminal_g_settings_new(app->schema_source,
+                                                 TERMINAL_SETTING_SCHEMA);
 
   /* Gtk debug settings */
-  app->gtk_debug_settings = terminal_g_settings_new (GTK_DEBUG_SETTING_SCHEMA,
-                                                     GTK_DEBUG_ENABLE_INSPECTOR_KEY,
-                                                     GTK_DEBUG_ENABLE_INSPECTOR_TYPE);
+  app->gtk_debug_settings = terminal_g_settings_new_checked(app->schema_source,
+                                                            GTK_DEBUG_SETTING_SCHEMA,
+                                                            GTK_DEBUG_ENABLE_INSPECTOR_KEY,
+                                                            GTK_DEBUG_ENABLE_INSPECTOR_TYPE);
 
   /* These are internal settings that exists only for distributions
    * to override, so we cache them on startup and don't react to changes.
@@ -845,11 +878,14 @@ terminal_app_init (TerminalApp *app)
 #endif
 
   /* Get the profiles */
-  app->profiles_list = terminal_profiles_list_new ();
+  app->profiles_list = terminal_profiles_list_new(app->schema_source);
 
   app->screen_map = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, nullptr);
 
-  gs_unref_object GSettings *settings = g_settings_get_child (app->global_settings, "keybindings");
+  gs_unref_object GSettings *settings =
+    terminal_g_settings_new_with_path(app->schema_source,
+                                      TERMINAL_KEYBINDINGS_SCHEMA,
+                                      TERMINAL_KEYBINDINGS_SCHEMA_PATH);
   terminal_accels_init (G_APPLICATION (app), settings, app->use_headerbar);
 }
 
@@ -871,7 +907,10 @@ terminal_app_finalize (GObject *object)
   g_object_unref (app->global_settings);
   g_object_unref (app->desktop_interface_settings);
   g_object_unref (app->system_proxy_settings);
+  for (int i = 0; i < 4; ++i)
+    g_object_unref(app->system_proxy_protocol_settings[i]);
   g_clear_object (&app->gtk_debug_settings);
+  g_settings_schema_source_unref(app->schema_source);
 
   g_clear_object (&app->menubar);
   g_clear_object (&app->menubar_new_terminal_section);
@@ -1188,6 +1227,18 @@ terminal_app_get_profile_section (TerminalApp *app)
 }
 
 /**
+ * terminal_app_get_schema_source:
+ * @app: a #TerminalApp
+ *
+ * Returns: (tranfer none): the #GSettingsSchemaSource to use for all #GSettings instances
+ */
+GSettingsSchemaSource*
+terminal_app_get_schema_source(TerminalApp *app)
+{
+  return app->schema_source;
+}
+
+/**
  * terminal_app_get_global_settings:
  * @app: a #TerminalApp
  *
@@ -1223,6 +1274,20 @@ terminal_app_get_proxy_settings (TerminalApp *app)
   return app->system_proxy_settings;
 }
 
+/**
+ * terminal_app_get_proxy_settings_for_protocol:
+ * @app: a #TerminalApp
+ * @protocol: a #TerminalProxyProtocol
+ *
+ * Returns: (tranfer none): the cached #GSettings object for the org.gnome.system.proxy.@protocol schema
+ */
+GSettings*
+terminal_app_get_proxy_settings_for_protocol(TerminalApp *app,
+                                             TerminalProxyProtocol protocol)
+{
+  return app->system_proxy_protocol_settings[(int)protocol];
+}
+
 GSettings *
 terminal_app_get_gtk_debug_settings (TerminalApp *app)
 {
diff --git a/src/terminal-app.hh b/src/terminal-app.hh
index d7e97681..b86aea5d 100644
--- a/src/terminal-app.hh
+++ b/src/terminal-app.hh
@@ -102,12 +102,24 @@ gboolean terminal_app_get_dialog_use_headerbar (TerminalApp *app);
 
 /* GSettings */
 
+typedef enum {
+  TERMINAL_PROXY_HTTP  = 0,
+  TERMINAL_PROXY_HTTPS = 1,
+  TERMINAL_PROXY_FTP   = 2,
+  TERMINAL_PROXY_SOCKS = 3,
+} TerminalProxyProtocol;
+
+GSettingsSchemaSource* terminal_app_get_schema_source(TerminalApp* app);
+
 GSettings *terminal_app_get_global_settings (TerminalApp *app);
 
 GSettings *terminal_app_get_desktop_interface_settings (TerminalApp *app);
 
 GSettings *terminal_app_get_proxy_settings (TerminalApp *app);
 
+GSettings *terminal_app_get_proxy_settings_for_protocol(TerminalApp *app,
+                                                        TerminalProxyProtocol protocol);
+
 GSettings *terminal_app_get_gtk_debug_settings (TerminalApp *app);
 
 PangoFontDescription *terminal_app_get_system_font (TerminalApp *app);
diff --git a/src/terminal-client-utils.cc b/src/terminal-client-utils.cc
index b3d6ae6d..4d7ed70d 100644
--- a/src/terminal-client-utils.cc
+++ b/src/terminal-client-utils.cc
@@ -284,3 +284,25 @@ out:
 #endif
   return nullptr;
 }
+
+GSettings*
+terminal_g_settings_new_with_path (GSettingsSchemaSource* source,
+                                   char const* schema_id,
+                                   char const* path)
+{
+  gs_unref_settings_schema GSettingsSchema* schema =
+    g_settings_schema_source_lookup(source,
+                                    schema_id,
+                                    TRUE /* recursive */);
+
+  return g_settings_new_full(schema,
+                             nullptr /* default backend */,
+                             path);
+}
+
+GSettings*
+terminal_g_settings_new(GSettingsSchemaSource* source,
+                        char const* schema_id)
+{
+  return terminal_g_settings_new_with_path(source, schema_id, nullptr);
+}
diff --git a/src/terminal-client-utils.hh b/src/terminal-client-utils.hh
index 19a0a2b7..0e1c14c5 100644
--- a/src/terminal-client-utils.hh
+++ b/src/terminal-client-utils.hh
@@ -53,6 +53,13 @@ char const* const* terminal_client_get_environment_filters (void);
 
 char** terminal_client_filter_environment           (char** envv) G_GNUC_MALLOC;
 
+GSettings* terminal_g_settings_new (GSettingsSchemaSource* source,
+                                    char const* schema_id);
+
+GSettings* terminal_g_settings_new_with_path (GSettingsSchemaSource* source,
+                                              char const* schema_id,
+                                              char const* path);
+
 G_END_DECLS
 
 #endif /* TERMINAL_UTIL_UTILS_H */
diff --git a/src/terminal-options.cc b/src/terminal-options.cc
index d015d167..04c55893 100644
--- a/src/terminal-options.cc
+++ b/src/terminal-options.cc
@@ -111,7 +111,7 @@ static TerminalSettingsList *
 terminal_options_ensure_profiles_list (TerminalOptions *options)
 {
   if (options->profiles_list == nullptr)
-    options->profiles_list = terminal_profiles_list_new ();
+    options->profiles_list = terminal_profiles_list_new(g_settings_schema_source_get_default());
 
   return options->profiles_list;
 }
diff --git a/src/terminal-profiles-list.cc b/src/terminal-profiles-list.cc
index 6d4c6a56..07a97636 100644
--- a/src/terminal-profiles-list.cc
+++ b/src/terminal-profiles-list.cc
@@ -65,13 +65,15 @@ valid_uuid (const char *str,
 
 /**
  * terminal_profiles_list_new:
+ * @schema_source: a #GSettingsSchemaSource
  *
  * Returns: (transfer full): a new #TerminalSettingsList for the profiles list
  */
 TerminalSettingsList *
-terminal_profiles_list_new (void)
+terminal_profiles_list_new(GSettingsSchemaSource* schema_source)
 {
-  return terminal_settings_list_new (TERMINAL_PROFILES_PATH_PREFIX,
+  return terminal_settings_list_new (schema_source,
+                                     TERMINAL_PROFILES_PATH_PREFIX,
                                      TERMINAL_PROFILES_LIST_SCHEMA,
                                      TERMINAL_PROFILE_SCHEMA,
                                      TERMINAL_SETTINGS_LIST_FLAG_HAS_DEFAULT);
diff --git a/src/terminal-profiles-list.hh b/src/terminal-profiles-list.hh
index 9a258d31..d8323751 100644
--- a/src/terminal-profiles-list.hh
+++ b/src/terminal-profiles-list.hh
@@ -25,7 +25,7 @@
 
 G_BEGIN_DECLS
 
-TerminalSettingsList *terminal_profiles_list_new (void);
+TerminalSettingsList *terminal_profiles_list_new(GSettingsSchemaSource* schema_source);
 
 GList *terminal_profiles_list_ref_children_sorted (TerminalSettingsList *list);
 
diff --git a/src/terminal-schemas.hh b/src/terminal-schemas.hh
index 08b6e85f..b146ba82 100644
--- a/src/terminal-schemas.hh
+++ b/src/terminal-schemas.hh
@@ -30,6 +30,8 @@ G_BEGIN_DECLS
 #define TERMINAL_SETTINGS_LIST_SCHEMA   "org.gnome.Terminal.SettingsList"
 #define TERMINAL_PROFILES_LIST_SCHEMA   "org.gnome.Terminal.ProfilesList"
 
+#define TERMINAL_KEYBINDINGS_SCHEMA_PATH "/org/gnome/terminal/legacy/keybindings/"
+
 #define TERMINAL_PROFILE_AUDIBLE_BELL_KEY               "audible-bell"
 #define TERMINAL_PROFILE_BOLD_IS_BRIGHT_KEY             "bold-is-bright"
 #define TERMINAL_PROFILE_BACKGROUND_COLOR_KEY           "background-color"
diff --git a/src/terminal-settings-list.cc b/src/terminal-settings-list.cc
index a247765b..095b99dc 100644
--- a/src/terminal-settings-list.cc
+++ b/src/terminal-settings-list.cc
@@ -18,6 +18,7 @@
 #include "config.h"
 
 #include "terminal-settings-list.hh"
+#include "terminal-client-utils.hh"
 
 #include <string.h>
 #include <uuid.h>
@@ -38,6 +39,7 @@ extern "C" {
 struct _TerminalSettingsList {
   GSettings parent;
 
+  GSettingsSchemaSource* schema_source;
   char *path;
   char *child_schema_id;
 
@@ -57,7 +59,8 @@ struct _TerminalSettingsListClass {
 };
 
 enum {
-  PROP_CHILD_SCHEMA_ID = 1,
+  PROP_SCHEMA_SOURCE = 1,
+  PROP_CHILD_SCHEMA_ID,
   PROP_FLAGS
 };
 
@@ -267,7 +270,9 @@ terminal_settings_list_ref_child_internal (TerminalSettingsList *list,
     goto done;
 
   path = path_new (list, uuid);
-  child = g_settings_new_with_path (list->child_schema_id, path);
+  child = terminal_g_settings_new_with_path(list->schema_source,
+                                            list->child_schema_id,
+                                            path);
   g_hash_table_insert (list->children, g_strdup (uuid), child /* adopted */);
 
  done:
@@ -282,7 +287,10 @@ new_child (TerminalSettingsList *list,
 
   if (name != nullptr) {
     gs_free char *new_path = path_new (list, new_uuid);
-    gs_unref_object GSettings *child = g_settings_new_with_path (list->child_schema_id, new_path);
+    gs_unref_object GSettings *child =
+      terminal_g_settings_new_with_path(list->schema_source,
+                                        list->child_schema_id,
+                                        new_path);
     g_settings_set_string (child, TERMINAL_PROFILE_VISIBLE_NAME_KEY, name);
   }
 
@@ -520,6 +528,7 @@ terminal_settings_list_constructed (GObject *object)
 
   G_OBJECT_CLASS (terminal_settings_list_parent_class)->constructed (object);
 
+  g_assert (list->schema_source != nullptr);
   g_assert (list->child_schema_id != nullptr);
 
   g_object_get (object, "path", &list->path, nullptr);
@@ -541,6 +550,7 @@ terminal_settings_list_finalize (GObject *object)
   g_strfreev (list->uuids);
   g_free (list->default_uuid);
   g_hash_table_unref (list->children);
+  g_settings_schema_source_unref(list->schema_source);
 
   G_OBJECT_CLASS (terminal_settings_list_parent_class)->finalize (object);
 }
@@ -554,6 +564,11 @@ terminal_settings_list_set_property (GObject *object,
   TerminalSettingsList *list = TERMINAL_SETTINGS_LIST (object);
 
   switch (prop_id) {
+  case PROP_SCHEMA_SOURCE: {
+    auto const schema_source = reinterpret_cast<GSettingsSchemaSource*>(g_value_get_boxed(value));
+    list->schema_source = g_settings_schema_source_ref(schema_source);
+    break;
+  }
     case PROP_CHILD_SCHEMA_ID:
       list->child_schema_id = g_value_dup_string (value);
       break;
@@ -581,6 +596,18 @@ terminal_settings_list_class_init (TerminalSettingsListClass *klass)
    *
    * The name of the schema of the children of this list.
    */
+  g_object_class_install_property (object_class, PROP_SCHEMA_SOURCE,
+                                   g_param_spec_boxed("schema-source", nullptr, nullptr,
+                                                      G_TYPE_SETTINGS_SCHEMA_SOURCE,
+                                                      GParamFlags(G_PARAM_CONSTRUCT_ONLY |
+                                                                  G_PARAM_WRITABLE |
+                                                                  G_PARAM_STATIC_STRINGS)));
+
+  /**
+   * TerminalSettingsList:child-schema-id:
+   *
+   * The name of the schema of the children of this list.
+   */
   g_object_class_install_property (object_class, PROP_CHILD_SCHEMA_ID,
                                    g_param_spec_string ("child-schema-id", nullptr, nullptr,
                                                         nullptr,
@@ -639,6 +666,7 @@ terminal_settings_list_class_init (TerminalSettingsListClass *klass)
 
 /**
  * terminal_settings_list_new:
+ * @schema_source: a #GSettingsSchemaSource
  * @path: the settings path for the list
  * @schema_id: the schema of the list, equal to or derived from "org.gnome.Terminal.SettingsList"
  * @child_schema_id: the schema of the list children
@@ -647,17 +675,20 @@ terminal_settings_list_class_init (TerminalSettingsListClass *klass)
  * Returns: (transfer full): the newly created #TerminalSettingsList
  */
 TerminalSettingsList *
-terminal_settings_list_new (const char *path,
+terminal_settings_list_new (GSettingsSchemaSource* schema_source,
+                            const char *path,
                             const char *schema_id,
                             const char *child_schema_id,
                             TerminalSettingsListFlags flags)
 {
+  g_return_val_if_fail (schema_source != nullptr, nullptr);
   g_return_val_if_fail (path != nullptr, nullptr);
   g_return_val_if_fail (schema_id != nullptr, nullptr);
   g_return_val_if_fail (child_schema_id != nullptr, nullptr);
   g_return_val_if_fail (g_str_has_suffix (path, ":/"), nullptr);
 
   return reinterpret_cast<TerminalSettingsList*>(g_object_new (TERMINAL_TYPE_SETTINGS_LIST,
+                                                               "schema-source", schema_source,
 							       "schema-id", schema_id,
 							       "child-schema-id", child_schema_id,
 							       "path", path,
diff --git a/src/terminal-settings-list.hh b/src/terminal-settings-list.hh
index 40fc8414..f131c2fa 100644
--- a/src/terminal-settings-list.hh
+++ b/src/terminal-settings-list.hh
@@ -36,7 +36,8 @@ typedef struct _TerminalSettingsListClass TerminalSettingsListClass;
 
 GType terminal_settings_list_get_type (void);
 
-TerminalSettingsList *terminal_settings_list_new (const char *path,
+TerminalSettingsList *terminal_settings_list_new (GSettingsSchemaSource* schema_source,
+                                                  const char *path,
                                                   const char *schema_id,
                                                   const char *child_schema_id,
                                                   TerminalSettingsListFlags flags);
diff --git a/src/terminal-util.cc b/src/terminal-util.cc
index db3a756c..7fbb1f78 100644
--- a/src/terminal-util.cc
+++ b/src/terminal-util.cc
@@ -584,21 +584,19 @@ set_proxy_env (GHashTable *env_table,
 }
 
 static void
-setup_proxy_env (GSettings  *proxy_settings,
-                 const char *child_schema_id,
+setup_proxy_env (TerminalApp* app,
+                 TerminalProxyProtocol protocol,
                  const char *proxy_scheme,
                  const char *env_name,
                  GHashTable *env_table)
 {
-  gs_unref_object GSettings *child_settings;
   GString *buf;
   gs_free char *host;
   int port;
-  gboolean is_http;
 
-  is_http = (strcmp (child_schema_id, "http") == 0);
+  gboolean is_http = (protocol == TERMINAL_PROXY_HTTP);
 
-  child_settings = g_settings_get_child (proxy_settings, child_schema_id);
+  GSettings *child_settings = terminal_app_get_proxy_settings_for_protocol(app, protocol);
 
   host = g_settings_get_string (child_settings, "host");
   port = g_settings_get_int (child_settings, "port");
@@ -636,23 +634,6 @@ setup_proxy_env (GSettings  *proxy_settings,
 }
 
 static void
-setup_autoconfig_proxy_env (GSettings *proxy_settings,
-                            GHashTable *env_table)
-{
-  /* XXX  Not sure what to do with this.  See bug #596688.
-  gs_free char *url;
-
-  url = g_settings_get_string (proxy_settings, "autoconfig-url");
-  if (url[0])
-    {
-      char *proxy;
-      proxy = g_strdup_printf ("pac+%s", url);
-      set_proxy_env (env_table, "http_proxy", proxy);
-    }
-  */
-}
-
-static void
 setup_ignore_proxy_env (GSettings *proxy_settings,
                         GHashTable *env_table)
 {
@@ -684,25 +665,23 @@ setup_ignore_proxy_env (GSettings *proxy_settings,
 void
 terminal_util_add_proxy_env (GHashTable *env_table)
 {
-  GSettings *proxy_settings;
-  GDesktopProxyMode mode;
-
-  proxy_settings = terminal_app_get_proxy_settings (terminal_app_get ());
-  mode = GDesktopProxyMode(g_settings_get_enum (proxy_settings, "mode"));
+  auto const app = terminal_app_get();
+  auto const proxy_settings = terminal_app_get_proxy_settings(app);
+  auto const mode = GDesktopProxyMode(g_settings_get_enum (proxy_settings, "mode"));
 
   if (mode == G_DESKTOP_PROXY_MODE_MANUAL)
     {
-      setup_proxy_env (proxy_settings, "http", "http", "http_proxy", env_table);
+      setup_proxy_env (app, TERMINAL_PROXY_HTTP, "http", "http_proxy", env_table);
       /* Even though it's https, the proxy scheme is 'http'. See bug #624440. */
-      setup_proxy_env (proxy_settings, "https", "http", "https_proxy", env_table);
+      setup_proxy_env (app, TERMINAL_PROXY_HTTPS, "http", "https_proxy", env_table);
       /* Even though it's ftp, the proxy scheme is 'http'. See bug #624440. */
-      setup_proxy_env (proxy_settings, "ftp", "http", "ftp_proxy", env_table);
-      setup_proxy_env (proxy_settings, "socks", "socks", "all_proxy", env_table);
+      setup_proxy_env (app, TERMINAL_PROXY_FTP, "http", "ftp_proxy", env_table);
+      setup_proxy_env (app, TERMINAL_PROXY_SOCKS, "socks", "all_proxy", env_table);
       setup_ignore_proxy_env (proxy_settings, env_table);
     }
   else if (mode == G_DESKTOP_PROXY_MODE_AUTO)
     {
-      setup_autoconfig_proxy_env (proxy_settings, env_table);
+      /* Not supported */
     }
 }
 
@@ -795,7 +774,8 @@ s_to_rgba (GVariant *variant,
 }
 
 /**
- * terminal_g_settings_new:
+ * terminal_g_settings_new_checked:
+ * @schema_source: a #GSettingsSchemaSource
  * @schema_id: a settings schema ID
  * @mandatory_key: the name of a key that must exist in the schema
  * @mandatory_key_type: the expected value type of @mandatory_key
@@ -807,15 +787,16 @@ s_to_rgba (GVariant *variant,
  * Returns: (transfer full): a new #GSettings, or %nullptr
  */
 GSettings *
-terminal_g_settings_new (const char *schema_id,
-                         const char *mandatory_key,
-                         const GVariantType *mandatory_key_type)
+terminal_g_settings_new_checked(GSettingsSchemaSource* schema_source,
+                                const char *schema_id,
+                                const char *mandatory_key,
+                                const GVariantType *mandatory_key_type)
 {
   gs_unref_settings_schema GSettingsSchema *schema;
 
-  schema = g_settings_schema_source_lookup (g_settings_schema_source_get_default (),
-                                            schema_id,
-                                            TRUE);
+  schema = g_settings_schema_source_lookup(schema_source,
+                                           schema_id,
+                                           TRUE);
   if (schema == nullptr)
     return nullptr;
 
diff --git a/src/terminal-util.hh b/src/terminal-util.hh
index 07c9470a..888a0fb0 100644
--- a/src/terminal-util.hh
+++ b/src/terminal-util.hh
@@ -71,9 +71,10 @@ char **terminal_util_get_etc_shells (void);
 
 gboolean terminal_util_get_is_shell (const char *command);
 
-GSettings *terminal_g_settings_new (const char *schema_id,
-                                    const char *mandatory_key,
-                                    const GVariantType *mandatory_key_type);
+GSettings *terminal_g_settings_new_checked(GSettingsSchemaSource* schema_source,
+                                           const char *schema_id,
+                                           const char *mandatory_key,
+                                           const GVariantType *mandatory_key_type);
 
 const GdkRGBA *terminal_g_settings_get_rgba (GSettings  *settings,
                                              const char *key,