[libvirt] [PATCH v2 1/4] virDomainCreateXML: Don't remove persistent domains on error

[Michal Privoznik]

https://bugzilla.redhat.com/show_bug.cgi?id=871452

Okay, so we allow users to 'virsh create' an already existing
domain, providing completely different XML than the one stored in
Libvirt. Well, as long as name and UUID matches. However, in some
drivers the code that handles errors unconditionally removes the
domain that failed to start even though the domain might have
been persistent. Fortunately, the domain is removed just from the
internal list of domains and the config file is kept around.

Steps to reproduce:

1) virsh dumpxml $dom > /tmp/dom.xml
2) change XML so that it is still parse-able but won't boot, e.g.
change guest agent path to /foo/bar
3) virsh create /tmp/dom.xml
4) virsh dumpxml $dom
5) Observe "No such domain" error

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/lxc/lxc_driver.c       | 6 ++++--
 src/qemu/qemu_driver.c     | 6 ++++--
 src/test/test_driver.c     | 7 ++++++-
 src/uml/uml_driver.c       | 7 ++++---
 src/vmware/vmware_driver.c | 6 ++++--
 5 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index a9f0005..e5e6c5a 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -1239,8 +1239,10 @@ lxcDomainCreateXMLWithFiles(virConnectPtr conn,
                            (flags & VIR_DOMAIN_START_AUTODESTROY),
                            VIR_DOMAIN_RUNNING_BOOTED) < 0) {
         virDomainAuditStart(vm, "booted", false);
-        virDomainObjListRemove(driver->domains, vm);
-        vm = NULL;
+        if (!vm->persistent) {
+            virDomainObjListRemove(driver->domains, vm);
+            vm = NULL;
+        }
         goto cleanup;
     }
 
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 2387cf3..30d2d98 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -1752,7 +1752,8 @@ static virDomainPtr qemuDomainCreateXML(virConnectPtr conn,
     def = NULL;
 
     if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) {
-        qemuDomainRemoveInactive(driver, vm);
+        if (!vm->persistent)
+            qemuDomainRemoveInactive(driver, vm);
         goto cleanup;
     }
 
@@ -1762,7 +1763,8 @@ static virDomainPtr qemuDomainCreateXML(virConnectPtr conn,
                          start_flags) < 0) {
         virDomainAuditStart(vm, "booted", false);
         qemuDomainObjEndJob(driver, vm);
-        qemuDomainRemoveInactive(driver, vm);
+        if (!vm->persistent)
+            qemuDomainRemoveInactive(driver, vm);
         goto cleanup;
     }
 
diff --git a/src/test/test_driver.c b/src/test/test_driver.c
index d11cda1..b40b079 100644
--- a/src/test/test_driver.c
+++ b/src/test/test_driver.c
@@ -1621,8 +1621,13 @@ testDomainCreateXML(virConnectPtr conn, const char *xml,
         goto cleanup;
     def = NULL;
 
-    if (testDomainStartState(privconn, dom, VIR_DOMAIN_RUNNING_BOOTED) < 0)
+    if (testDomainStartState(privconn, dom, VIR_DOMAIN_RUNNING_BOOTED) < 0) {
+        if (!dom->persistent) {
+            virDomainObjListRemove(privconn->domains, dom);
+            dom = NULL;
+        }
         goto cleanup;
+    }
 
     event = virDomainEventLifecycleNewFromObj(dom,
                                      VIR_DOMAIN_EVENT_STARTED,
diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index 2b61f73..d4b03b3 100644
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -1623,9 +1623,10 @@ static virDomainPtr umlDomainCreateXML(virConnectPtr conn, const char *xml,
     if (umlStartVMDaemon(conn, driver, vm,
                          (flags & VIR_DOMAIN_START_AUTODESTROY)) < 0) {
         virDomainAuditStart(vm, "booted", false);
-        virDomainObjListRemove(driver->domains,
-                               vm);
-        vm = NULL;
+        if (!vm->persistent) {
+            virDomainObjListRemove(driver->domains, vm);
+            vm = NULL;
+        }
         goto cleanup;
     }
     virDomainAuditStart(vm, "booted", true);
diff --git a/src/vmware/vmware_driver.c b/src/vmware/vmware_driver.c
index e228aaa..152af39 100644
--- a/src/vmware/vmware_driver.c
+++ b/src/vmware/vmware_driver.c
@@ -716,8 +716,10 @@ vmwareDomainCreateXML(virConnectPtr conn, const char *xml,
     vmdef = NULL;
 
     if (vmwareStartVM(driver, vm) < 0) {
-        virDomainObjListRemove(driver->domains, vm);
-        vm = NULL;
+        if (!vm->persistent) {
+            virDomainObjListRemove(driver->domains, vm);
+            vm = NULL;
+        }
         goto cleanup;
     }
 
-- 
2.4.9