[libvirt] [PATCH][QEMU driver] Catch cdrom change error

Ryan Harper ryanh at us.ibm.com
Thu Mar 25 16:35:30 UTC 2010

Currently when we attempt to change the cdrom in a qemu VM the monitor
doesn't generate an error if the target filename doesn't exist.  I've
submitted a patch[1] for this.  This patch is the libvirt qemu-driver
side which catches the error message from the monitor and reportes the
error to libvirt.  This means that virsh attach-disk cdrom commands
won't appear to succeed when qemu change command actually failed.

I've tested this patch on an older libvirt (rebuild libvirt-0.7.0 on my
ubuntu host) but haven't rebuilt against git head since I can't
quite compile that on my host.

1. http://lists.gnu.org/archive/html/qemu-devel/2010-03/msg01935.html

Signed-off-by: Ryan Harper <ryanh at us.ibm.com>

diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
index 1596e59..f868907 100644
--- a/src/qemu/qemu_monitor_text.c
+++ b/src/qemu/qemu_monitor_text.c
@@ -905,7 +905,14 @@ int qemuMonitorTextChangeMedia(qemuMonitorPtr mon,
                         _("could not eject media on %s: %s"), devname, reply);
         goto cleanup;
-    }
+    } 
+    /* Could not open message indicates bad filename */
+    if (strstr(reply, "\nCould not open ")) {
+        qemuReportError(VIR_ERR_OPERATION_FAILED,
+                        _("could not change media on %s: %s"), devname, reply);
+        goto cleanup;
+    } 
     ret = 0;
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh at us.ibm.com

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