Re: [libvirt] [PATCH 1/2] qemuDomainAttachNetDevice: Don't overwrite error on rollback

If there is an error hotpluging a net device (for whatever reason) a rollback operation is performed. However, whilst doing so various helper functions that are called report errors on their own. This results in the original error to be overwritten and thus misleading the user. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_hotplug.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index e06862c..34f2135 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -935,6 +935,7 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver, virDomainNetDefPtr net) { qemuDomainObjPrivatePtr priv = vm->privateData; + virErrorPtr originalError = NULL; char **tapfdName = NULL; int *tapfd = NULL; size_t tapfdSize = 0; @@ -1320,6 +1321,7 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver, if (!virDomainObjIsActive(vm)) goto cleanup; + originalError = virSaveLastError();

if (vlan < 0) { if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_NETDEV)) { char *netdev_name; @@ -1350,6 +1352,8 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver, ignore_value(qemuDomainObjExitMonitor(driver, vm)); VIR_FREE(hostnet_name); } + virSetError(originalError); + virFreeError(originalError); goto cleanup; }