[libvirt] [PATCH 2/8] systemd: don't report an error if the guest is already terminated

[Daniel P. Berrange]

In many cases where we invoke virSystemdTerminateMachine the
process(es) will have already gone away on their own accord.
In these cases we log an error message that the machine does
not exist. We should catch this particular error and simply
ignore it, so we don't pollute the logs.
---
 src/util/virsystemd.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/src/util/virsystemd.c b/src/util/virsystemd.c
index 3eea5c2..29a2e63 100644
--- a/src/util/virsystemd.c
+++ b/src/util/virsystemd.c
@@ -340,18 +340,22 @@ int virSystemdTerminateMachine(const char *name,
     int ret;
     DBusConnection *conn;
     char *machinename = NULL;
+    DBusError error;
+
+    dbus_error_init(&error);
 
     ret = virDBusIsServiceEnabled("org.freedesktop.machine1");
     if (ret < 0)
-        return ret;
+        goto cleanup;
 
     if ((ret = virDBusIsServiceRegistered("org.freedesktop.systemd1")) < 0)
-        return ret;
+        goto cleanup;
+
+    ret = -1;
 
     if (!(conn = virDBusGetSystemBus()))
-        return -1;
+        goto cleanup;
 
-    ret = -1;
     if (!(machinename = virSystemdMakeMachineName(name, drivername, privileged)))
         goto cleanup;
 
@@ -368,7 +372,7 @@ int virSystemdTerminateMachine(const char *name,
     VIR_DEBUG("Attempting to terminate machine via systemd");
     if (virDBusCallMethod(conn,
                           NULL,
-                          NULL,
+                          &error,
                           "org.freedesktop.machine1",
                           "/org/freedesktop/machine1",
                           "org.freedesktop.machine1.Manager",
@@ -377,9 +381,20 @@ int virSystemdTerminateMachine(const char *name,
                           machinename) < 0)
         goto cleanup;
 
+    if (dbus_error_is_set(&error) &&
+        !STREQ_NULLABLE("org.freedesktop.machine1.NoSuchMachine",
+                        error.name)) {
+        virReportError(VIR_ERR_DBUS_SERVICE,
+                       _("TerminateMachine: %s"),
+                       error.message ? error.message : _("unknown error"));
+        goto cleanup;
+    }
+
     ret = 0;
 
  cleanup:
+    dbus_error_free(&error);
+
     VIR_FREE(machinename);
     return ret;
 }
-- 
2.1.0