ifcfg-rh: ensure missing STP property is interpreted as "off" (rh #922702)

The initscripts interpreted it this way, so we do too.

src/settings/plugins/ifcfg-rh/reader.c

@@ -3792,6 +3792,7 @@ make_bridge_setting (shvarFile *ifcfg,
 	char *value;
 	guint32 u;
 	gboolean stp = FALSE;
+	gboolean stp_set = FALSE;
 
 	s_bridge = NM_SETTING_BRIDGE (nm_setting_bridge_new ());
 
@@ -3809,13 +3810,20 @@ make_bridge_setting (shvarFile *ifcfg,
 		if (!strcasecmp (value, "on") || !strcasecmp (value, "yes")) {
 			g_object_set (s_bridge, NM_SETTING_BRIDGE_STP, TRUE, NULL);
 			stp = TRUE;
-		} else if (!strcasecmp (value, "off") || !strcasecmp (value, "no"))
+			stp_set = TRUE;
+		} else if (!strcasecmp (value, "off") || !strcasecmp (value, "no")) {
 			g_object_set (s_bridge, NM_SETTING_BRIDGE_STP, FALSE, NULL);
-		else
+			stp_set = TRUE;
+		} else
 			PLUGIN_WARN (IFCFG_PLUGIN_NAME, "    warning: invalid STP value '%s'", value);
 		g_free (value);
 	}
 
+	if (!stp_set) {
+		/* Missing or invalid STP property means "no" */
+		g_object_set (s_bridge, NM_SETTING_BRIDGE_STP, FALSE, NULL);
+	}
+
 	value = svGetValue (ifcfg, "DELAY", FALSE);
 	if (value) {
 		if (stp) {

src/settings/plugins/ifcfg-rh/tests/network-scripts/Makefile.am

@@ -81,6 +81,7 @@ EXTRA_DIST = \
 	ifcfg-test-wired-ctc-static \
 	ifcfg-test-bridge-main \
 	ifcfg-test-bridge-component \
+	ifcfg-test-bridge-missing-stp \
 	ifcfg-test-vlan-interface \
 	ifcfg-test-vlan-only-vlanid \
 	ifcfg-test-vlan-only-device \

src/settings/plugins/ifcfg-rh/tests/network-scripts/ifcfg-test-bridge-missing-stp

@@ -0,0 +1,5 @@
+DEVICE=br0
+ONBOOT=no
+TYPE=Bridge
+BOOTPROTO=dhcp
+

src/settings/plugins/ifcfg-rh/tests/test-ifcfg-rh.c

@@ -11853,6 +11853,46 @@ test_write_bridge_component (void)
 	g_object_unref (reread);
 }
 
+static void
+test_read_bridge_missing_stp (void)
+{
+	NMConnection *connection;
+	NMSettingBridge *s_bridge;
+	char *unmanaged = NULL;
+	char *keyfile = NULL;
+	char *routefile = NULL;
+	char *route6file = NULL;
+	gboolean ignore_error = FALSE;
+	GError *error = NULL;
+
+	connection = connection_from_file (TEST_IFCFG_DIR"/network-scripts/ifcfg-test-bridge-missing-stp",
+	                                   NULL,
+	                                   TYPE_BRIDGE,
+	                                   NULL,
+	                                   &unmanaged,
+	                                   &keyfile,
+	                                   &routefile,
+	                                   &route6file,
+	                                   &error,
+	                                   &ignore_error);
+	g_assert (connection);
+	g_assert (nm_connection_verify (connection, &error));
+	g_assert_no_error (error);
+
+	/* ===== Bridging SETTING ===== */
+
+	s_bridge = nm_connection_get_setting_bridge (connection);
+	g_assert (s_bridge);
+	g_assert_cmpstr (nm_setting_bridge_get_interface_name (s_bridge), ==, "br0");
+	g_assert_cmpuint (nm_setting_bridge_get_stp (s_bridge), ==, FALSE);
+
+	g_free (unmanaged);
+	g_free (keyfile);
+	g_free (routefile);
+	g_free (route6file);
+	g_object_unref (connection);
+}
+
 #define TEST_IFCFG_VLAN_INTERFACE TEST_IFCFG_DIR"/network-scripts/ifcfg-test-vlan-interface"
 
 static void
@@ -13107,10 +13147,12 @@ int main (int argc, char **argv)
 	test_write_bond_slave ();
 	test_write_bond_slave_ib ();
 
+	/* bridging */
 	test_read_bridge_main ();
 	test_write_bridge_main ();
 	test_read_bridge_component ();
 	test_write_bridge_component ();
+	test_read_bridge_missing_stp ();
 
 	/* Stuff we expect to fail for now */
 	test_write_wired_pppoe ();