[libvirt] potential bug in qemu snapshots

[Justin Clift]

On 23/12/2010, at 5:35 AM, Eric Blake wrote:
<snip>
> Should we refuse to make snapshots if we don't detect the GNU extension
> of 'dd iflag=fullblock'?  Probably safe to do on GNU/Linux machines, but
> I'm wondering if it will have negative effects on BSD machines where GNU
> coreutils is not installed.

As a thought, that option isn't known to the dd supplied with OSX 10.6.5:

  $ dd if=/dev/zero of=foo bs=1024 count=1
  1+0 records in
  1+0 records out
  1024 bytes transferred in 0.000041 secs (24970740 bytes/sec)
  $ rm foo

  $ dd if=/dev/zero of=foo bs=1024 count=1 iflag=fullblock
  dd: unknown operand iflag
  $