[PATCH 3/4] storage: FS backend adjust error message on error path

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https://bugzilla.redhat.com/show_bug.cgi?id=1181087

Currently the assumption on the error message is that there are
no source device path's defined when the != 1 check fails, but in
reality the value could 0 or 2 or more, so adjust the error message
accordingly to make it clearer what the error really is.

Signed-off-by: John Ferlan <jferlan@xxxxxxxxxx>
---
 src/storage/storage_backend_fs.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index 9a1343d..3c39646 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -362,8 +362,13 @@ virStorageBackendFileSystemValidateFS(virStoragePoolObjPtr pool)
         }
     } else {
         if (pool->def->source.ndevice != 1) {
-            virReportError(VIR_ERR_INTERNAL_ERROR,
-                           "%s", _("missing source device"));
+            if (pool->def->source.ndevice == 0)
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("missing source device"));
+            else
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("Expected exactly 1 device for the "
+                                 "storage pool"));
             return -1;
         }
     }
-- 
2.1.0

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