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savevm fails with inserted CD, "Device '%s' is writable but does not support snapshots."
Hi,
yesterday unfortunately a customer reported a failed snapshot of his VM. Going through the logfile I discovered:
"Device 'ide1-cd0' is writable but does not support snapshots"
this is with qemu-1.2.0 and 1.0.1 at least...
Why writeable?
Even if I specify "-drive ...,readonly=on,snapshot=off" to qemu the monitor-command sees the CD-ROM-device as being writeable?!
Somewhere I saw a "hint" for blockdev.c:
=== snip ===
--- /tmp/blockdev.c 2012-10-24 11:37:10.000000000 +0200
+++ blockdev.c 2012-10-24 11:37:17.000000000 +0200
@@ -551,6 +551,7 @@
case IF_XEN:
case IF_NONE:
dinfo->media_cd = media == MEDIA_CDROM;
+ dinfo->bdrv->read_only = 1;
break;
case IF_SD:
case IF_FLOPPY:
=== snap ===
after installing with this small patch applied it works, so insert CD, savevm <somename> succeeds.
This should be fixed at all correct places, and the tags "readonly=on,snapshot=off" should do it, too. Or even just work after specifying a drive being a CD-rom should do the trick ;-)
Another "bad habit" is, that the ISO/DVD-file has to be writeable to be changed?
Thnx for attention and regards,
Oliver.
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