[PATCH] virsh: Check whether enough arguments was passed to iothreadset

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

Virsh has iothreadset command which allows setting various
attributes of IOThreads. However, when the command is called
without any arguments (besides domain and IOThread IDs), then
@params stays NULL and is passed to virDomainSetIOThreadParams()
which produces rather user unfriendly error message:

  error: params in virDomainSetIOThreadParams must not be NULL

Introduce a check and produce better error message.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 tools/virsh-domain.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 5c4a7d7b8d..cfdaac1942 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -7853,6 +7853,11 @@ cmdIOThreadSet(vshControl *ctl, const vshCmd *cmd)
 
 #undef VSH_IOTHREAD_SET_UINT_PARAMS
 
+    if (nparams == 0) {
+        vshError(ctl, _("Not enough arguments passed, nothing to set"));
+        goto cleanup;
+    }
+
     if (virDomainSetIOThreadParams(dom, id, params, nparams, flags) < 0)
         goto cleanup;
 
-- 
2.35.1