[libvirt] [PATCH 1/3] snapshot: fix logic bug in qemu undefine

[Eric Blake]

Commit 19f8c98 introduced VIR_DOMAIN_UNDEFINE_SNAPSHOTS_METADATA,
with the intent that omitting the flag makes undefine fail, and
including the flag deletes metadata.  But it used the wrong logic.
Also, hoist the transient domain sooner, so that we don't
accidentally remove metadata of a transient domain.

* src/qemu/qemu_driver.c (qemuDomainUndefineFlags): Check correct
flag value.
---
 src/qemu/qemu_driver.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 67c43ab..4a24019 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5095,7 +5095,7 @@ cleanup:

 static int
 qemuDomainUndefineFlags(virDomainPtr dom,
-                         unsigned int flags)
+                        unsigned int flags)
 {
     struct qemud_driver *driver = dom->conn->privateData;
     virDomainObjPtr vm;
@@ -5118,11 +5118,17 @@ qemuDomainUndefineFlags(virDomainPtr dom,
         goto cleanup;
     }

+    if (!vm->persistent) {
+        qemuReportError(VIR_ERR_OPERATION_INVALID,
+                        "%s", _("cannot undefine transient domain"));
+        goto cleanup;
+    }
+
     if (!virDomainObjIsActive(vm) &&
         (nsnapshots = virDomainSnapshotObjListNum(&vm->snapshots, 0))) {
         struct snap_remove rem;

-        if (flags & VIR_DOMAIN_UNDEFINE_SNAPSHOTS_METADATA) {
+        if (!(flags & VIR_DOMAIN_UNDEFINE_SNAPSHOTS_METADATA)) {
             qemuReportError(VIR_ERR_OPERATION_INVALID,
                             _("cannot delete inactive domain with %d "
                               "snapshots"),
@@ -5139,12 +5145,6 @@ qemuDomainUndefineFlags(virDomainPtr dom,
             goto cleanup;
     }

-    if (!vm->persistent) {
-        qemuReportError(VIR_ERR_OPERATION_INVALID,
-                        "%s", _("cannot undefine transient domain"));
-        goto cleanup;
-    }
-
     name = qemuDomainManagedSavePath(driver, vm);
     if (name == NULL)
         goto cleanup;
-- 
1.7.4.4