tests: test container live patching

.gitignore

@@ -84,6 +84,7 @@ src/tests/lxc-test-destroytest
 src/tests/lxc-test-get_item
 src/tests/lxc-test-getkeys
 src/tests/lxc-test-list
+src/tests/lxc-test-livepatch
 src/tests/lxc-test-locktests
 src/tests/lxc-test-lxcpath
 src/tests/lxc-test-may-control

src/lxc/lxccontainer.c

@@ -2838,7 +2838,7 @@ static bool do_lxcapi_set_running_config_item(struct lxc_container *c, const cha
 
 	ret = lxc_cmd_set_config_item(c->name, key, v, do_lxcapi_get_config_path(c));
 	if (ret < 0)
-		ERROR("Failed to live patch container");
+		SYSERROR("%s - Failed to live patch container", strerror(-ret));
 
 	container_mem_unlock(c);
 	return ret == 0;

src/tests/Makefile.am

@@ -27,6 +27,7 @@ lxc_test_utils_SOURCES = lxc-test-utils.c lxctest.h
 lxc_test_parse_config_file_SOURCES = parse_config_file.c lxctest.h
 lxc_test_config_jump_table_SOURCES = config_jump_table.c lxctest.h
 lxc_test_shortlived_SOURCES = shortlived.c
+lxc_test_livepatch_SOURCES = livepatch.c lxctest.h
 
 AM_CFLAGS=-DLXCROOTFSMOUNT=\"$(LXCROOTFSMOUNT)\" \
 	-DLXCPATH=\"$(LXCPATH)\" \
@@ -55,7 +56,7 @@ bin_PROGRAMS = lxc-test-containertests lxc-test-locktests lxc-test-startone \
 	lxc-test-snapshot lxc-test-concurrent lxc-test-may-control \
 	lxc-test-reboot lxc-test-list lxc-test-attach lxc-test-device-add-remove \
 	lxc-test-apparmor lxc-test-utils lxc-test-parse-config-file \
-	lxc-test-config-jump-table lxc-test-shortlived
+	lxc-test-config-jump-table lxc-test-shortlived lxc-test-livepatch
 
 bin_SCRIPTS = lxc-test-automount \
 	      lxc-test-autostart \
@@ -91,6 +92,7 @@ EXTRA_DIST = \
 	get_item.c \
 	getkeys.c \
 	list.c \
+	livepatch.c \
 	locktests.c \
 	lxcpath.c \
 	lxc-test-lxc-attach \

src/tests/livepatch.c

+/* liblxcapi
+ *
+ * Copyright © 2017 Christian Brauner <christian.brauner@ubuntu.com>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <lxc/lxccontainer.h>
+
+#include "lxctest.h"
+
+int main(int argc, char *argv[])
+{
+	char *value;
+	struct lxc_container *c;
+	int ret = EXIT_FAILURE;
+
+	c = lxc_container_new("livepatch", NULL);
+	if (!c) {
+		lxc_error("%s", "Failed to create container \"livepatch\"");
+		exit(ret);
+	}
+
+	if (c->is_defined(c)) {
+		lxc_error("%s\n", "Container \"livepatch\" is defined");
+		goto on_error_put;
+	}
+
+	if (!c->set_config_item(c, "lxc.net.0.type", "veth")) {
+		lxc_error("%s\n", "Failed to set network item \"lxc.net.0.type\"");
+		goto on_error_put;
+	}
+
+	if (!c->set_config_item(c, "lxc.net.0.link", "lxcbr0")) {
+		lxc_error("%s\n", "Failed to set network item \"lxc.net.0.link\"");
+		goto on_error_put;
+	}
+
+	if (!c->set_config_item(c, "lxc.net.0.flags", "up")) {
+		lxc_error("%s\n", "Failed to set network item \"lxc.net.0.flags\"");
+		goto on_error_put;
+	}
+
+	if (!c->set_config_item(c, "lxc.net.0.name", "eth0")) {
+		lxc_error("%s\n", "Failed to set network item \"lxc.net.0.name\"");
+		goto on_error_put;
+	}
+
+	if (!c->createl(c, "busybox", NULL, NULL, 0, NULL)) {
+		lxc_error("%s\n", "Failed to create busybox container \"livepatch\"");
+		goto on_error_put;
+	}
+
+	if (!c->is_defined(c)) {
+		lxc_error("%s\n", "Container \"livepatch\" is not defined");
+		goto on_error_put;
+	}
+
+	c->clear_config(c);
+
+	if (!c->load_config(c, NULL)) {
+		lxc_error("%s\n", "Failed to load config for container \"livepatch\"");
+		goto on_error_stop;
+	}
+
+	if (!c->want_daemonize(c, true)) {
+		lxc_error("%s\n", "Failed to mark container \"livepatch\" daemonized");
+		goto on_error_stop;
+	}
+
+	if (!c->startl(c, 0, NULL)) {
+		lxc_error("%s\n", "Failed to start container \"livepatch\" daemonized");
+		goto on_error_stop;
+	}
+
+	/* Test whether the current value is ok. */
+	value = c->get_running_config_item(c, "lxc.net.0.name");
+	if (!value) {
+		lxc_error("%s\n", "Failed to retrieve running config item \"lxc.net.0.name\"");
+		goto on_error_stop;
+	}
+
+	if (strcmp(value, "eth0")) {
+		lxc_error("Retrieved unexpected value for config item "
+			  "\"lxc.net.0.name\": eth0 != %s", value);
+		free(value);
+		goto on_error_stop;
+	}
+	free(value);
+
+	/* Change current in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.0.name", "blabla")) {
+		lxc_error("%s\n", "Failed to set running config item "
+				  "\"lxc.net.0.name\" to \"blabla\"");
+		goto on_error_stop;
+	}
+
+	/* Verify change. */
+	value = c->get_running_config_item(c, "lxc.net.0.name");
+	if (!value) {
+		lxc_error("%s\n", "Failed to retrieve running config item \"lxc.net.0.name\"");
+		goto on_error_stop;
+	}
+
+	if (strcmp(value, "blabla")) {
+		lxc_error("Retrieved unexpected value for config item "
+			  "\"lxc.net.0.name\": blabla != %s", value);
+		free(value);
+		goto on_error_stop;
+	}
+	free(value);
+
+	/* Change current in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.0.name", "eth0")) {
+		lxc_error("%s\n", "Failed to set running config item "
+				  "\"lxc.net.0.name\" to \"eth0\"");
+		goto on_error_stop;
+	}
+
+	/* Add new in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.1.type", "veth")) {
+		lxc_error("%s\n", "Failed to set running config item "
+				  "\"lxc.net.1.type\" to \"veth\"");
+		goto on_error_stop;
+	}
+
+	/* Verify change. */
+	value = c->get_running_config_item(c, "lxc.net.1.type");
+	if (!value) {
+		lxc_error("%s\n", "Failed to retrieve running config item \"lxc.net.1.type\"");
+		goto on_error_stop;
+	}
+
+	if (strcmp(value, "veth")) {
+		lxc_error("Retrieved unexpected value for config item "
+			  "\"lxc.net.1.type\": veth != %s", value);
+		free(value);
+		goto on_error_stop;
+	}
+	free(value);
+
+	/* Add new in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.1.flags", "up")) {
+		lxc_error("%s\n", "Failed to set running config item "
+				  "\"lxc.net.1.flags\" to \"up\"");
+		goto on_error_stop;
+	}
+
+	/* Verify change. */
+	value = c->get_running_config_item(c, "lxc.net.1.flags");
+	if (!value) {
+		lxc_error("%s\n", "Failed to retrieve running config item \"lxc.net.1.flags\"");
+		goto on_error_stop;
+	}
+
+	if (strcmp(value, "up")) {
+		lxc_error("Retrieved unexpected value for config item "
+			  "\"lxc.net.1.flags\": up != %s", value);
+		free(value);
+		goto on_error_stop;
+	}
+	free(value);
+
+	/* Add new in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.1.link", "lxcbr0")) {
+		lxc_error("%s\n", "Failed to set running config item "
+				  "\"lxc.net.1.link\" to \"lxcbr0\"");
+		goto on_error_stop;
+	}
+
+	/* Verify change. */
+	value = c->get_running_config_item(c, "lxc.net.1.link");
+	if (!value) {
+		lxc_error("%s\n", "Failed to retrieve running config item \"lxc.net.1.link\"");
+		goto on_error_stop;
+	}
+
+	if (strcmp(value, "lxcbr0")) {
+		lxc_error("Retrieved unexpected value for config item "
+			  "\"lxc.net.1.link\": lxcbr0 != %s", value);
+		free(value);
+		goto on_error_stop;
+	}
+	free(value);
+
+	if (!c->reboot(c)) {
+		lxc_error("%s", "Failed to create container \"livepatch\"");
+		goto on_error_stop;
+	}
+
+	/* Busybox shouldn't take long to reboot. Sleep for 5s. */
+	sleep(5);
+
+	if (!c->is_running(c)) {
+		lxc_error("%s\n", "Failed to reboot container \"livepatch\"");
+		goto on_error_destroy;
+	}
+
+	/* Remove in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.1.name", "eth1")) {
+		lxc_error("%s\n", "Failed to clear running config item "
+				  "\"lxc.net.1.name\"");
+		goto on_error_stop;
+	}
+
+	if (!c->stop(c)) {
+		lxc_error("%s\n", "Failed to stop container \"livepatch\"");
+		goto on_error_stop;
+	}
+
+	if (!c->startl(c, 0, NULL)) {
+		lxc_error("%s\n", "Failed to start container \"livepatch\" daemonized");
+		goto on_error_destroy;
+	}
+
+	/* Remove in-memory value. */
+	if (!c->set_running_config_item(c, "lxc.net.1.mtu", "3000")) {
+		lxc_error("%s\n", "Failed to set running config item "
+				  "\"lxc.net.1.mtu\"");
+		goto on_error_stop;
+	}
+
+	ret = 0;
+
+on_error_stop:
+	if (c->is_running(c) && !c->stop(c))
+		lxc_error("%s\n", "Failed to stop container \"livepatch\"");
+
+on_error_destroy:
+	if (!c->destroy(c))
+		lxc_error("%s\n", "Failed to destroy container \"livepatch\"");
+
+on_error_put:
+	lxc_container_put(c);
+	exit(ret);
+}