From 211415492266084e9652615de07eb1527878e2c2 Mon Sep 17 00:00:00 2001
From: John Ferlan <jferlan@redhat.com>
Date: Tue, 12 Dec 2017 08:31:03 -0500
Subject: [PATCH] util: Report error if vhost-scsi device file cannot be found

https://bugzilla.redhat.com/show_bug.cgi?id=1523564

If the vhost-scsi device file cannot be found, the generic error

    "error: An error occurred, but the cause is unknown"

is returned.  Let's add a real error message to make it clear
why the failure occurred.
---
 src/util/virscsivhost.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/util/virscsivhost.c b/src/util/virscsivhost.c
index d6fbf5ed5b..5f176e177f 100644
--- a/src/util/virscsivhost.c
+++ b/src/util/virscsivhost.c
@@ -86,8 +86,12 @@ VIR_ONCE_GLOBAL_INIT(virSCSIVHost)
 int
 virSCSIVHostOpenVhostSCSI(int *vhostfd)
 {
-    if (!virFileExists(VHOST_SCSI_DEVICE))
+    if (!virFileExists(VHOST_SCSI_DEVICE)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("vhost-scsi device file '%s' cannot be found"),
+                       VHOST_SCSI_DEVICE);
         return -1;
+    }
 
     *vhostfd = open(VHOST_SCSI_DEVICE, O_RDWR);