Add a new example to illustrate domain migration

This commit adds a new example to illustrate peer to
peer domain migration with virDomainMigrateToURI.

Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>

.gitignore

@@ -74,6 +74,7 @@
 /examples/object-events/event-test
 /examples/dominfo/info1
 /examples/domsuspend/suspend
+/examples/dommigrate/dommigrate
 /examples/hellolibvirt/hellolibvirt
 /examples/openauth/openauth
 /gnulib/lib/*

Makefile.am

@@ -23,7 +23,7 @@ SUBDIRS = . gnulib/lib include src daemon tools docs gnulib/tests \
   tests po examples/object-events examples/hellolibvirt \
   examples/dominfo examples/domsuspend examples/apparmor \
   examples/xml/nwfilter examples/openauth examples/systemtap \
-  tools/wireshark
+  tools/wireshark examples/dommigrate
 
 ACLOCAL_AMFLAGS = -I m4
 

configure.ac

@@ -2730,6 +2730,7 @@ AC_CONFIG_FILES([\
         examples/object-events/Makefile \
         examples/domsuspend/Makefile \
         examples/dominfo/Makefile \
+        examples/dommigrate/Makefile \
         examples/openauth/Makefile \
         examples/hellolibvirt/Makefile \
         examples/systemtap/Makefile \

examples/dommigrate/Makefile.am

@@ -0,0 +1,5 @@
+INCLUDES = -I$(top_builddir)/include -I$(top_srcdir)/include -I$(top_srcdir)
+noinst_PROGRAMS = dommigrate
+dommigrate_CFLAGS = $(WARN_CFLAGS)
+dommigrate_SOURCES = dommigrate.c
+dommigrate_LDADD = $(top_builddir)/src/libvirt.la

examples/dommigrate/dommigrate.c

@@ -0,0 +1,89 @@
+/*
+ * dommigrate.c: This file is largely inspired from hellolibvirt and
+ *               contains a trivial example that illustrate p2p domain
+ *               migration with libvirt.
+ *
+ * Copyright (C) 2014 Cloudwatt
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Sahid Orentino Ferdjaoui <sahid.ferdjaoui@cloudwatt.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <libvirt/libvirt.h>
+#include <libvirt/virterror.h>
+
+
+static int
+usage(char *prgn, int ret)
+{
+    printf("Usage: %s <src uri> <dst uri> <domain name>\n", prgn);
+    return ret;
+}
+
+int
+main(int argc, char *argv[])
+{
+    char *src_uri, *dst_uri, *domname;
+    int ret = 0;
+    virConnectPtr conn = NULL;
+    virDomainPtr dom = NULL;
+
+    if (argc < 4) {
+        ret = usage(argv[0], 1);
+        goto out;
+    }
+
+    src_uri = argv[1];
+    dst_uri = argv[2];
+    domname = argv[3];
+
+    printf("Attempting to connect to the source hypervisor...\n");
+    conn = virConnectOpenAuth(src_uri, virConnectAuthPtrDefault, 0);
+    if (!conn) {
+        ret = 1;
+        fprintf(stderr, "No connection to the source hypervisor: %s.\n",
+                virGetLastErrorMessage());
+        goto out;
+    }
+
+    printf("Attempting to retrieve domain %s...\n", domname);
+    dom = virDomainLookupByName(conn, domname);
+    if (!dom) {
+        fprintf(stderr, "Failed to find domain %s.\n", domname);
+        goto cleanup;
+    }
+
+    printf("Attempting to migrate %s to %s...\n", domname, dst_uri);
+    if ((ret = virDomainMigrateToURI(dom, dst_uri,
+                                     VIR_MIGRATE_PEER2PEER,
+                                     NULL, 0)) != 0) {
+        fprintf(stderr, "Failed to migrate domain %s.\n", domname);
+        goto cleanup;
+    }
+
+    printf("Migration finished with success.\n");
+
+ cleanup:
+    if (dom != NULL)
+        virDomainFree(dom);
+    if (conn != NULL)
+        virConnectClose(conn);
+
+ out:
+    return ret;
+}

libvirt.spec.in

@@ -1498,7 +1498,7 @@ rm -fr %{buildroot}
 # on RHEL 5, thus we need to expand it here.
 make install DESTDIR=%{?buildroot} SYSTEMD_UNIT_DIR=%{_unitdir}
 
-for i in object-events dominfo domsuspend hellolibvirt openauth xml/nwfilter systemtap
+for i in object-events dominfo domsuspend hellolibvirt openauth xml/nwfilter systemtap dommigrate
 do
   (cd examples/$i ; make clean ; rm -rf .deps .libs Makefile Makefile.in)
 done
@@ -2222,6 +2222,7 @@ exit 0
 %doc examples/object-events
 %doc examples/dominfo
 %doc examples/domsuspend
+%doc examples/dommigrate
 %doc examples/openauth
 %doc examples/xml
 %doc examples/systemtap