libnm-util: add non-failing versions of nm_connection_new_from_hash() and replace-settings

Add internal functions _nm_connection_replace_settings() and
_nm_connection_new_from_hash() that cannot fail.

Altough they are not public API, we have to expose them via
libnm-util.ver so that they can be used from libnm-glib.

libnm-util/libnm-util.ver

@@ -1,5 +1,7 @@
 {
 global:
+	_nm_connection_new_from_hash;
+	_nm_connection_replace_settings;
 	nm_connection_add_setting;
 	nm_connection_clear_secrets;
 	nm_connection_clear_secrets_with_flags;

libnm-util/nm-connection.c

@@ -327,19 +327,30 @@ validate_permissions_type (GHashTable *hash, GError **error)
 	return TRUE;
 }
 
-static void
-hash_to_connection (NMConnection *connection, GHashTable *new)
+/**
+ * _nm_connection_replace_settings:
+ * @connection: a #NMConnection
+ * @new_settings: (element-type utf8 GLib.HashTable): a #GHashTable of settings
+ **/
+void
+_nm_connection_replace_settings (NMConnection *connection,
+                                 GHashTable *new_settings)
 {
+	NMConnectionPrivate *priv = NM_CONNECTION_GET_PRIVATE (connection);
 	GHashTableIter iter;
 	const char *setting_name;
 	GHashTable *setting_hash;
 	gboolean changed;
-	NMConnectionPrivate *priv = NM_CONNECTION_GET_PRIVATE (connection);
+
+	g_return_if_fail (NM_IS_CONNECTION (connection));
+	g_return_if_fail (new_settings != NULL);
+
+	priv = NM_CONNECTION_GET_PRIVATE (connection);
 
 	if ((changed = g_hash_table_size (priv->settings) > 0))
 		g_hash_table_foreach_remove (priv->settings, _setting_release, connection);
 
-	g_hash_table_iter_init (&iter, new);
+	g_hash_table_iter_init (&iter, new_settings);
 	while (g_hash_table_iter_next (&iter, (gpointer) &setting_name, (gpointer) &setting_hash)) {
 		GType type = nm_connection_lookup_setting_type (setting_name);
 
@@ -373,13 +384,12 @@ nm_connection_replace_settings (NMConnection *connection,
 {
 	g_return_val_if_fail (NM_IS_CONNECTION (connection), FALSE);
 	g_return_val_if_fail (new_settings != NULL, FALSE);
-	if (error)
-		g_return_val_if_fail (*error == NULL, FALSE);
+	g_return_val_if_fail (!error || !*error, FALSE);
 
 	if (!validate_permissions_type (new_settings, error))
 		return FALSE;
 
-	hash_to_connection (connection, new_settings);
+	_nm_connection_replace_settings (connection, new_settings);
 	return nm_connection_verify (connection, error);
 }
 
@@ -1440,6 +1450,29 @@ nm_connection_new (void)
 	return (NMConnection *) g_object_new (NM_TYPE_CONNECTION, NULL);
 }
 
+/**
+ * _nm_connection_new_from_hash:
+ * @hash: (element-type utf8 GLib.HashTable): the #GHashTable describing
+ * the connection
+ *
+ * Creates a new #NMConnection from a hash table describing the connection.  See
+ * nm_connection_to_hash() for a description of the expected hash table.
+ *
+ * Returns: the new #NMConnection object, populated with settings created
+ * from the values in the hash table.
+ **/
+NMConnection *
+_nm_connection_new_from_hash (GHashTable *hash)
+{
+	NMConnection *connection;
+
+	g_return_val_if_fail (hash != NULL, NULL);
+
+	connection = nm_connection_new ();
+	_nm_connection_replace_settings (connection, hash);
+	return connection;
+}
+
 /**
  * nm_connection_new_from_hash:
  * @hash: (element-type utf8 GLib.HashTable): the #GHashTable describing
@@ -1463,8 +1496,7 @@ nm_connection_new_from_hash (GHashTable *hash, GError **error)
 	if (!validate_permissions_type (hash, error))
 		return NULL;
 
-	connection = nm_connection_new ();
-	hash_to_connection (connection, hash);
+	connection = _nm_connection_new_from_hash (hash);
 	if (!nm_connection_verify (connection, error))
 		g_clear_object (&connection);
 	return connection;

libnm-util/nm-setting-private.h

@@ -23,6 +23,8 @@
 
 #include "nm-default.h"
 
+#include "nm-connection.h"
+
 #define NM_SETTING_SECRET_FLAGS_ALL \
 	(NM_SETTING_SECRET_FLAG_NONE | \
 	 NM_SETTING_SECRET_FLAG_AGENT_OWNED | \
@@ -62,6 +64,10 @@ gint _nm_setting_compare_priority (gconstpointer a, gconstpointer b);
 
 gboolean _nm_setting_get_property (NMSetting *setting, const char *name, GValue *value);
 
+NMConnection *_nm_connection_new_from_hash (GHashTable *hash);
+void          _nm_connection_replace_settings (NMConnection *connection,
+                                               GHashTable *new_settings);
+
 typedef enum NMSettingUpdateSecretResult {
 	NM_SETTING_UPDATE_SECRET_ERROR              = FALSE,
 	NM_SETTING_UPDATE_SECRET_SUCCESS_MODIFIED   = TRUE,