[PATCH] check more error info about whether drive_add failed

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

When we attach a disk, but we specify a wrong format of disk image,
qemu monitor command drive_add will fail, but libvirt does not detect
this error.

Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>

---
 src/qemu/qemu_monitor_text.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
index 6d0ba4c..0fd7546 100644
--- a/src/qemu/qemu_monitor_text.c
+++ b/src/qemu/qemu_monitor_text.c
@@ -2453,6 +2453,12 @@ int qemuMonitorTextAddDrive(qemuMonitorPtr mon,
         goto cleanup;
     }
 
+    if (strstr(reply, "could not open disk image")) {
+        qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
+                        _("open disk image file failed"));
+        goto cleanup;
+    }
+
     ret = 0;
 
 cleanup:
-- 
1.7.1

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