Re: [Libguestfs] cdrom device handling
On Fri, Oct 12, 2012 at 05:43:58PM +0200, Olaf Hering wrote:
On Fri, Oct 12, Richard W.M. Jones wrote:
> virt-rescue should come up with the disk and CD-ROM as /dev/sda and
> /dev/sdb respectively. This should be enough to read the data off the
> CD (/dev/sdb). What else would you want to do?
I have not tried it, but I can imagine the following can happen:
Depending on the order of devices a disk may come after the first cdrom.
So a disk 'sdb' in the guest may become 'sdc' in the guest. If one does
a chroot into the guest to do some fixup _and_ if something within that
guest is configured to use kernel device names (like sdb) instead of
LABEL/UUID then failures can occur.
So its just about providing some correctness in virt-rescue.
We add them in the same order that libvirt presents them to us. I
don't know what steps libvirt takes to preserve that order.
In any case, use labels & UUIDs, not device names!
Rich.
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