ifcfg-rh: read/write dhcp-send-hostname as DHCP_SEND_HOSTNAME (rh #1001529)

It is an extension compared to initscripts (not in sysconfig.txt). But it is
necessary for preserving dhcp-send-hostname. Missing DHCP_SEND_HOSTNAME is
treated as "yes", which matches dhcp-send-hostname default value being TRUE.

https://bugzilla.redhat.com/show_bug.cgi?id=1001529

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

@@ -15,7 +15,7 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
- * Copyright (C) 2008 - 2012 Red Hat, Inc.
+ * Copyright (C) 2008 - 2013 Red Hat, Inc.
  */
 
 #include <config.h>
@@ -1365,7 +1365,11 @@ make_ip4_setting (shvarFile *ifcfg,
 	if (!strcmp (method, NM_SETTING_IP4_CONFIG_METHOD_AUTO)) {
 		value = svGetValue (ifcfg, "DHCP_HOSTNAME", FALSE);
 		if (value && strlen (value))
-			g_object_set (s_ip4, NM_SETTING_IP4_CONFIG_DHCP_HOSTNAME, value, NULL);
+			g_object_set (s_ip4,
+			              NM_SETTING_IP4_CONFIG_DHCP_HOSTNAME, value,
+			              NM_SETTING_IP4_CONFIG_DHCP_SEND_HOSTNAME,
+			                  svTrueValue (ifcfg, "DHCP_SEND_HOSTNAME", TRUE),
+			              NULL);
 		g_free (value);
 
 		value = svGetValue (ifcfg, "DHCP_CLIENT_ID", FALSE);

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

@@ -8,6 +8,7 @@ EXTRA_DIST = \
 	ifcfg-test-wired-static-bootproto \
 	ifcfg-test-wired-dhcp \
 	ifcfg-test-wired-dhcp-plus-ip \
+	ifcfg-test-wired-dhcp-send-hostname \
 	ifcfg-test-wired-dhcp6-only \
 	ifcfg-test-wired-global-gateway \
 	network-test-wired-global-gateway \

src/settings/plugins/ifcfg-rh/tests/network-scripts/ifcfg-test-wired-dhcp-send-hostname

@@ -0,0 +1,12 @@
+# Intel Corporation 82540EP Gigabit Ethernet Controller (Mobile)
+TYPE=Ethernet
+DEVICE=eth0
+HWADDR=00:11:22:33:44:ee
+BOOTPROTO=dhcp
+ONBOOT=yes
+IPV6INIT=yes
+IPV6_AUTOCONF=yes
+USERCTL=yes
+NM_CONTROLLED=yes
+PEERDNS=no
+DHCP_HOSTNAME="svata-pulec"

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

@@ -6561,6 +6561,75 @@ test_write_wired_dhcp_plus_ip (void)
 	g_object_unref (reread);
 }
 
+static void
+test_read_write_wired_dhcp_send_hostname (void)
+{
+	NMConnection *connection, *reread;
+	NMSettingIP4Config *s_ip4;
+	NMSettingIP6Config *s_ip6;
+	const char * dhcp_hostname = "kamil-patka";
+	char *written = NULL;
+	GError *error = NULL;
+	gboolean success = FALSE;
+
+	connection = connection_from_file (TEST_IFCFG_DIR"/network-scripts/ifcfg-test-wired-dhcp-send-hostname",
+	                                   NULL, TYPE_ETHERNET, NULL, NULL,
+	                                   NULL, NULL, NULL, &error, NULL);
+	g_assert_no_error (error);
+	g_assert (connection != NULL);
+
+	/* Check dhcp-hostname and dhcp-send-hostname */
+	s_ip4 = nm_connection_get_setting_ip4_config (connection);
+	s_ip6 = nm_connection_get_setting_ip6_config (connection);
+	g_assert (s_ip4);
+	g_assert (s_ip6);
+	g_assert (nm_setting_ip4_config_get_dhcp_send_hostname (s_ip4) == TRUE);
+	g_assert_cmpstr (nm_setting_ip4_config_get_dhcp_hostname (s_ip4), ==, "svata-pulec");
+	g_assert_cmpstr (nm_setting_ip6_config_get_dhcp_hostname (s_ip6), ==, "svata-pulec");
+
+	/* Set dhcp-send-hostname=false dhcp-hostname="kamil-patka" and write the connection. */
+	g_object_set (s_ip4, NM_SETTING_IP4_CONFIG_DHCP_SEND_HOSTNAME, FALSE, NULL);
+	g_object_set (s_ip4, NM_SETTING_IP4_CONFIG_DHCP_HOSTNAME, dhcp_hostname, NULL);
+	g_object_set (s_ip6, NM_SETTING_IP4_CONFIG_DHCP_HOSTNAME, dhcp_hostname, NULL);
+
+	success = writer_new_connection (connection,
+	                                 TEST_SCRATCH_DIR "/network-scripts/",
+	                                 &written,
+	                                 &error);
+	g_assert (success);
+
+	/* reread will be normalized, so we must normalize connection too. */
+	nm_utils_normalize_connection (connection, TRUE);
+
+	/* re-read the connection for comparison */
+	reread = connection_from_file (written, NULL, TYPE_ETHERNET, NULL, NULL,
+	                               NULL, NULL, NULL, &error, NULL);
+	unlink (written);
+	g_free (written);
+
+	g_assert_no_error (error);
+	g_assert (reread != NULL);
+
+	success = nm_connection_verify (reread, &error);
+	g_assert_no_error (error);
+	g_assert (success);
+
+	success = nm_connection_compare (connection, reread, NM_SETTING_COMPARE_FLAG_EXACT);
+	g_assert (success);
+
+	/* Check dhcp-hostname and dhcp-send-hostname from the re-read connection. */
+	s_ip4 = nm_connection_get_setting_ip4_config (reread);
+	s_ip6 = nm_connection_get_setting_ip6_config (reread);
+	g_assert (s_ip4);
+	g_assert (s_ip6);
+	g_assert (nm_setting_ip4_config_get_dhcp_send_hostname (s_ip4) == FALSE);
+	g_assert_cmpstr (nm_setting_ip4_config_get_dhcp_hostname (s_ip4), ==, dhcp_hostname);
+	g_assert_cmpstr (nm_setting_ip6_config_get_dhcp_hostname (s_ip6), ==, dhcp_hostname);
+
+	g_object_unref (connection);
+	g_object_unref (reread);
+}
+
 static void
 test_write_wired_static_ip6_only (void)
 {
@@ -13215,6 +13284,7 @@ int main (int argc, char **argv)
 	test_read_wired_static (TEST_IFCFG_WIRED_STATIC_BOOTPROTO, "System test-wired-static-bootproto", FALSE);
 	test_read_wired_dhcp ();
 	g_test_add_func (TPATH "dhcp-plus-ip", test_read_wired_dhcp_plus_ip);
+	g_test_add_func (TPATH "dhcp-send-hostname", test_read_write_wired_dhcp_send_hostname);
 	test_read_wired_global_gateway ();
 	test_read_wired_never_default ();
 	test_read_wired_defroute_no ();

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

@@ -15,7 +15,7 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
- * Copyright (C) 2009 - 2012 Red Hat, Inc.
+ * Copyright (C) 2009 - 2013 Red Hat, Inc.
  */
 
 #include <string.h>
@@ -1971,6 +1971,13 @@ write_ip4_setting (NMConnection *connection, shvarFile *ifcfg, GError **error)
 		if (value)
 			svSetValue (ifcfg, "DHCP_HOSTNAME", value, FALSE);
 
+		/* Missing DHCP_SEND_HOSTNAME means TRUE, and we prefer not write it explicitly
+		 * in that case, because it is NM-specific variable
+		 */
+		svSetValue (ifcfg, "DHCP_SEND_HOSTNAME",
+		            nm_setting_ip4_config_get_dhcp_send_hostname (s_ip4) ? NULL : "no",
+		            FALSE);
+
 		value = nm_setting_ip4_config_get_dhcp_client_id (s_ip4);
 		if (value)
 			svSetValue (ifcfg, "DHCP_CLIENT_ID", value, FALSE);