[libvirt] [PATCH] qemu_process: print generic error if qemu exit without printing any error

[Pavel Hrdina <phrdina redhat com>]

In this case we would print only the libvirt part of error message without any
explanation what happened:

"error: internal error: process exited while connecting to monitor:"

Let's print a generic error if this happens.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1335617

Signed-off-by: Pavel Hrdina <phrdina redhat com>
---
 src/qemu/qemu_process.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index e847cd1..86701da 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -1808,6 +1808,13 @@ qemuProcessReportLogError(qemuDomainLogContextPtr logCtxt,
     if (qemuProcessReadLog(logCtxt, &logmsg) < 0)
         return -1;
 
+    if (virStringIsEmpty(logmsg)) {
+        VIR_FREE(logmsg);
+        if (VIR_STRDUP(logmsg, _("qemu process exited without any "
+                                 "error printed out")) < 0)
+            return -1;
+    }
+
     virResetLastError();
     virReportError(VIR_ERR_INTERNAL_ERROR,
                    _("%s: %s"), msgprefix, logmsg);
-- 
2.8.3