[libvirt] [PATCH] qemuProcessLaunch: Return earlier if spawning qemu failed

[Michal Privoznik]

If spawning qemu fails then we report an error and proceed to
writing status XML onto the disk. This is unnecessary as we are
sure that the domain is not running.

At the same time, if virPidFileReadPath() fails it returns
-errno. Use it in the error message. It may explain what went
wrong.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/qemu/qemu_process.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 90466771cd..5b5864c021 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -6624,16 +6624,18 @@ qemuProcessLaunch(virConnectPtr conn,
 
     /* wait for qemu process to show up */
     if (rv == 0) {
-        if (virPidFileReadPath(priv->pidfile, &vm->pid) < 0) {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           _("Domain %s didn't show up"), vm->def->name);
-            rv = -1;
+        if ((rv = virPidFileReadPath(priv->pidfile, &vm->pid)) < 0) {
+            virReportSystemError(-rv,
+                                 _("Domain %s didn't show up"),
+                                 vm->def->name);
+            goto cleanup;
         }
         VIR_DEBUG("QEMU vm=%p name=%s running with pid=%lld",
                   vm, vm->def->name, (long long)vm->pid);
     } else {
         VIR_DEBUG("QEMU vm=%p name=%s failed to spawn",
                   vm, vm->def->name);
+        goto cleanup;
     }
 
     VIR_DEBUG("Writing early domain status to disk");
-- 
2.21.0