settings: add "plugin" argument to AddAndActivate2()

This will confine a newly added connection to a particular settings
plugin.

introspection/org.freedesktop.NetworkManager.Settings.xml

@@ -67,7 +67,7 @@
         AddConnection2:
         @settings: New connection settings, properties, and (optionally) secrets.
         @flags: Flags. Unknown flags cause the call to fail.
-        @args: Optional arguments dictionary, for extentibility. Currently, no arguments are accepted. Specifying unknown keys causes the call to fail.
+        @args: Optional arguments dictionary, for extentibility. Specifying unknown keys causes the call to fail.
         @path: Object path of the new connection that was just added.
         @result: Output argument, currently no additional results are returned.
         @since: 1.20
@@ -100,6 +100,17 @@
         </varlistentry>
         </variablelist>
 
+        The %args argument accepts the following keys:
+
+        <variablelist>
+        <varlistentry>
+          <term><literal>plugin</literal>:</term>
+          <listitem><para>The settings plugin the newly added connection will
+          use, such as "keyfile" or "ifcfg-rh".</para>
+          <para role="since">Since 1.38</para></listitem>
+        </varlistentry>
+        </variablelist>
+
         Either the flags 0x1 (to-disk) or 0x2 (in-memory) must be specified.
         The effect is whether to behave like
         <link linkend="gdbus-method-org-freedesktop-NetworkManager-Settings.AddConnection">AddConnection</link> or

src/core/devices/bluetooth/nm-bluez-manager.c

@@ -1352,6 +1352,7 @@ _conn_create_panu_connection(NMBluezManager *self, BzDBusObj *bzobj)
           bzobj->d_device.address);
 
     nm_settings_add_connection(priv->settings,
+                               NULL,
                                connection,
                                NM_SETTINGS_CONNECTION_PERSIST_MODE_IN_MEMORY_ONLY,
                                NM_SETTINGS_CONNECTION_ADD_REASON_NONE,

src/core/devices/wifi/nm-iwd-manager.c

@@ -948,6 +948,7 @@ mirror_connection(NMIwdManager         *self,
 
     if (!nm_settings_add_connection(
             priv->settings,
+            NULL,
             connection,
             NM_SETTINGS_CONNECTION_PERSIST_MODE_IN_MEMORY_ONLY,
             NM_SETTINGS_CONNECTION_ADD_REASON_NONE,

src/core/nm-checkpoint.c

@@ -247,6 +247,7 @@ restore_and_activate_connection(NMCheckpoint *self, DeviceCheckpoint *dev_checkp
 
         persist_mode = NM_SETTINGS_CONNECTION_PERSIST_MODE_TO_DISK;
         if (!nm_settings_add_connection(NM_SETTINGS_GET,
+                                        NULL,
                                         dev_checkpoint->settings_connection,
                                         persist_mode,
                                         NM_SETTINGS_CONNECTION_ADD_REASON_NONE,

src/core/nm-manager.c

@@ -2939,6 +2939,7 @@ get_existing_connection(NMManager *self, NMDevice *device, gboolean *out_generat
     nm_device_assume_state_reset(device);
 
     if (!nm_settings_add_connection(priv->settings,
+                                    NULL,
                                     connection,
                                     NM_SETTINGS_CONNECTION_PERSIST_MODE_IN_MEMORY_ONLY,
                                     NM_SETTINGS_CONNECTION_ADD_REASON_NONE,
@@ -5915,6 +5916,7 @@ _add_and_activate_auth_done(NMManager                      *self,
      * shutdown. */
     nm_settings_add_connection_dbus(
         priv->settings,
+        NULL,
         connection,
         persist_mode,
         NM_SETTINGS_CONNECTION_ADD_REASON_NONE,

src/core/settings/nm-settings.c

@@ -1463,6 +1463,7 @@ _plugin_connections_reload(NMSettings *self)
 
 static gboolean
 _add_connection_to_first_plugin(NMSettings                  *self,
+                                const char                  *plugin_name,
                                 SettConnEntry               *sett_conn_entry,
                                 NMConnection                *new_connection,
                                 gboolean                     in_memory,
@@ -1477,6 +1478,7 @@ _add_connection_to_first_plugin(NMSettings                  *self,
     gs_free_error GError *first_error = NULL;
     GSList               *iter;
     const char           *uuid;
+    gboolean              no_plugin = TRUE;
 
     uuid = nm_connection_get_uuid(new_connection);
 
@@ -1493,6 +1495,11 @@ _add_connection_to_first_plugin(NMSettings                  *self,
         gboolean                           success;
         const char                        *filename;
 
+        if (plugin_name && strcmp(plugin_name, nm_settings_plugin_get_plugin_name(plugin))) {
+            /* Not the plugin we're confined to. Ignore. */
+            continue;
+        }
+
         if (!in_memory) {
             NMSettingsStorage *conflicting_storage;
 
@@ -1545,6 +1552,8 @@ _add_connection_to_first_plugin(NMSettings                  *self,
                                                         &add_error);
         }
 
+        no_plugin = FALSE;
+
         if (!success) {
             _LOGT("add-connection: failed to add %s/'%s': %s",
                   nm_connection_get_uuid(new_connection),
@@ -1588,8 +1597,18 @@ _add_connection_to_first_plugin(NMSettings                  *self,
         return TRUE;
     }
 
-    nm_assert(first_error);
+    if (no_plugin) {
-    g_propagate_error(error, g_steal_pointer(&first_error));
+        nm_assert(plugin_name);
+        nm_assert(!first_error);
+        g_set_error(error,
+                    NM_SETTINGS_ERROR,
+                    NM_SETTINGS_ERROR_INVALID_ARGUMENTS,
+                    "a plugin by the name of '%s' is not available",
+                    plugin_name);
+    } else {
+        nm_assert(first_error);
+        g_propagate_error(error, g_steal_pointer(&first_error));
+    }
     return FALSE;
 }
 
@@ -1704,6 +1723,7 @@ _set_nmmeta_tombstone(NMSettings *self,
  */
 gboolean
 nm_settings_add_connection(NMSettings                     *self,
+                           const char                     *plugin,
                            NMConnection                   *connection,
                            NMSettingsConnectionPersistMode persist_mode,
                            NMSettingsConnectionAddReason   add_reason,
@@ -1824,6 +1844,7 @@ again_add_connection:
 
     if (!update_storage) {
         success = _add_connection_to_first_plugin(self,
+                                                  plugin,
                                                   sett_conn_entry,
                                                   connection,
                                                   new_in_memory,
@@ -2176,6 +2197,7 @@ nm_settings_update_connection(NMSettings                      *self,
 
         if (!update_storage) {
             success = _add_connection_to_first_plugin(self,
+                                                      NULL,
                                                       sett_conn_entry,
                                                       connection,
                                                       new_in_memory,
@@ -2462,6 +2484,7 @@ pk_add_cb(NMAuthChain *chain, GDBusMethodInvocation *context, gpointer user_data
         nm_assert(NM_IS_CONNECTION(connection));
 
         nm_settings_add_connection(self,
+                                   nm_auth_chain_get_data(chain, "plugin"),
                                    connection,
                                    GPOINTER_TO_UINT(nm_auth_chain_get_data(chain, "persist-mode")),
                                    GPOINTER_TO_UINT(nm_auth_chain_get_data(chain, "add-reason")),
@@ -2489,6 +2512,7 @@ pk_add_cb(NMAuthChain *chain, GDBusMethodInvocation *context, gpointer user_data
 
 void
 nm_settings_add_connection_dbus(NMSettings                     *self,
+                                const char                     *plugin,
                                 NMConnection                   *connection,
                                 NMSettingsConnectionPersistMode persist_mode,
                                 NMSettingsConnectionAddReason   add_reason,
@@ -2549,6 +2573,7 @@ nm_settings_add_connection_dbus(NMSettings                     *self,
     nm_auth_chain_set_data(chain, "persist-mode", GUINT_TO_POINTER(persist_mode), NULL);
     nm_auth_chain_set_data(chain, "add-reason", GUINT_TO_POINTER(add_reason), NULL);
     nm_auth_chain_set_data(chain, "sett-flags", GUINT_TO_POINTER(sett_flags), NULL);
+    nm_auth_chain_set_data(chain, "plugin", g_strdup(plugin), g_free);
     nm_auth_chain_add_call_unsafe(chain, perm, TRUE);
     return;
 
@@ -2601,6 +2626,7 @@ settings_add_connection_helper(NMSettings                   *self,
                                GDBusMethodInvocation        *context,
                                gboolean                      is_add_connection_2,
                                GVariant                     *settings,
+                               const char                   *plugin,
                                NMSettingsAddConnection2Flags flags)
 {
     gs_unref_object NMConnection   *connection = NULL;
@@ -2636,6 +2662,7 @@ settings_add_connection_helper(NMSettings                   *self,
 
     nm_settings_add_connection_dbus(
         self,
+        plugin,
         connection,
         persist_mode,
         NM_FLAGS_HAS(flags, NM_SETTINGS_ADD_CONNECTION2_FLAG_BLOCK_AUTOCONNECT)
@@ -2665,6 +2692,7 @@ impl_settings_add_connection(NMDBusObject                      *obj,
                                    invocation,
                                    FALSE,
                                    settings,
+                                   NULL,
                                    NM_SETTINGS_ADD_CONNECTION2_FLAG_TO_DISK);
 }
 
@@ -2685,6 +2713,7 @@ impl_settings_add_connection_unsaved(NMDBusObject                      *obj,
                                    invocation,
                                    FALSE,
                                    settings,
+                                   NULL,
                                    NM_SETTINGS_ADD_CONNECTION2_FLAG_IN_MEMORY);
 }
 
@@ -2700,8 +2729,10 @@ impl_settings_add_connection2(NMDBusObject                      *obj,
     NMSettings                   *self     = NM_SETTINGS(obj);
     gs_unref_variant GVariant    *settings = NULL;
     gs_unref_variant GVariant    *args     = NULL;
+    gs_free char                 *plugin   = NULL;
     NMSettingsAddConnection2Flags flags;
     const char                   *args_name;
+    GVariant                     *args_value;
     GVariantIter                  iter;
     guint32                       flags_u;
 
@@ -2745,7 +2776,13 @@ impl_settings_add_connection2(NMDBusObject                      *obj,
     nm_assert(g_variant_is_of_type(args, G_VARIANT_TYPE("a{sv}")));
 
     g_variant_iter_init(&iter, args);
-    while (g_variant_iter_next(&iter, "{&sv}", &args_name, NULL)) {
+    while (g_variant_iter_next(&iter, "{&sv}", &args_name, &args_value)) {
+        if (plugin == NULL && nm_streq(args_name, "plugin")
+            && g_variant_is_of_type(args_value, G_VARIANT_TYPE_STRING)) {
+            plugin = g_variant_dup_string(args_value, NULL);
+            continue;
+        }
+
         g_dbus_method_invocation_take_error(invocation,
                                             g_error_new(NM_SETTINGS_ERROR,
                                                         NM_SETTINGS_ERROR_INVALID_ARGUMENTS,
@@ -2754,7 +2791,7 @@ impl_settings_add_connection2(NMDBusObject                      *obj,
         return;
     }
 
-    settings_add_connection_helper(self, invocation, TRUE, settings, flags);
+    settings_add_connection_helper(self, invocation, TRUE, settings, plugin, flags);
 }
 
 /*****************************************************************************/
@@ -3606,6 +3643,7 @@ device_realized(NMDevice *device, GParamSpec *pspec, NMSettings *self)
           nm_device_get_iface(device));
 
     nm_settings_add_connection(self,
+                               NULL,
                                connection,
                                NM_SETTINGS_CONNECTION_PERSIST_MODE_IN_MEMORY_ONLY,
                                NM_SETTINGS_CONNECTION_ADD_REASON_NONE,

src/core/settings/nm-settings.h

@@ -68,6 +68,7 @@ typedef void (*NMSettingsAddCallback)(NMSettings            *settings,
                                       gpointer               user_data);
 
 void nm_settings_add_connection_dbus(NMSettings                     *self,
+                                     const char                     *plugin,
                                      NMConnection                   *connection,
                                      NMSettingsConnectionPersistMode persist_mode,
                                      NMSettingsConnectionAddReason   add_reason,
@@ -90,6 +91,7 @@ NMSettingsConnection **nm_settings_get_connections_clone(NMSettings
                                                          gpointer         sort_data);
 
 gboolean nm_settings_add_connection(NMSettings                     *settings,
+                                    const char                     *plugin,
                                     NMConnection                   *connection,
                                     NMSettingsConnectionPersistMode persist_mode,
                                     NMSettingsConnectionAddReason   add_reason,