[libvirt] [v2 PATCH] qemu: Improve error output for virDomainListGetStats

[Luyao Huang]

A unsupport error will output from qemuConnectGetAllDomainStats. Add a
check for the flags in qemuConnectGetAllDomainStats and improve the error
in the current implementation.From manual of virsh:
The approaches can't be combined.

Improve error to:

error: --domain and --list-* flags are mutually exclusive

Signed-off-by: Luyao Huang <lhuang at redhat.com>
---
 src/qemu/qemu_driver.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6acaea8..60c3882 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -18487,13 +18487,18 @@ qemuConnectGetAllDomainStats(virConnectPtr conn,
     unsigned int privflags = 0;
     unsigned int domflags = 0;
 
-    if (ndoms)
-        virCheckFlags(VIR_CONNECT_GET_ALL_DOMAINS_STATS_ENFORCE_STATS, -1);
-    else
-        virCheckFlags(VIR_CONNECT_LIST_DOMAINS_FILTERS_ACTIVE |
-                      VIR_CONNECT_LIST_DOMAINS_FILTERS_PERSISTENT |
-                      VIR_CONNECT_LIST_DOMAINS_FILTERS_STATE |
-                      VIR_CONNECT_GET_ALL_DOMAINS_STATS_ENFORCE_STATS, -1);
+    if (ndoms && (flags & (VIR_CONNECT_LIST_DOMAINS_FILTERS_ACTIVE |
+                           VIR_CONNECT_LIST_DOMAINS_FILTERS_PERSISTENT |
+                           VIR_CONNECT_LIST_DOMAINS_FILTERS_STATE))) {
+        virReportInvalidArg(flags, "%s",
+                    _("--domain and --list-* flags are mutually exclusive"));
+        return -1;
+    }
+
+    virCheckFlags(VIR_CONNECT_LIST_DOMAINS_FILTERS_ACTIVE |
+                  VIR_CONNECT_LIST_DOMAINS_FILTERS_PERSISTENT |
+                  VIR_CONNECT_LIST_DOMAINS_FILTERS_STATE |
+                  VIR_CONNECT_GET_ALL_DOMAINS_STATS_ENFORCE_STATS, -1);
 
     if (virConnectGetAllDomainStatsEnsureACL(conn) < 0)
         return -1;
-- 
1.8.3.1