[libvirt] [PATCH] qemu: Report better error message when renaming to existing domain name

[Martin Kletzander]

Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
 src/qemu/qemu_driver.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 99a3817ff5ab..16061a51d4a7 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19892,6 +19892,7 @@ static int qemuDomainRename(virDomainPtr dom,
     virQEMUDriverPtr driver = dom->conn->privateData;
     virQEMUDriverConfigPtr cfg = NULL;
     virDomainObjPtr vm = NULL;
+    virDomainObjPtr tmp_dom = NULL;
     virObjectEventPtr event_new = NULL;
     virObjectEventPtr event_old = NULL;
     int ret = -1;
@@ -19946,6 +19947,21 @@ static int qemuDomainRename(virDomainPtr dom,
         goto endjob;
     }

+    /*
+     * This is a rather racy check, but still better than reporting
+     * internal error.  And since new_name != name here, there's no
+     * deadlock imminent.
+     */
+    tmp_dom = virDomainObjListFindByName(driver->domains, new_name);
+    if (tmp_dom) {
+        virObjectUnlock(tmp_dom);
+        virObjectUnref(tmp_dom);
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       _("domain with name '%s' already exists"),
+                       new_name);
+        goto endjob;
+    }
+
     if (VIR_STRDUP(new_dom_name, new_name) < 0)
         goto endjob;

-- 
2.5.0