Re: [Qemu-devel] [PATCH] qemu-img rebase: allow backing file to be specified as '-'

[Christoph Hellwig]

On Mon, Oct 15, 2012 at 12:07:37PM -0600, Eric Blake wrote:
> On 10/15/2012 11:29 AM, Alex Bligh wrote:
> > This patch allows qemu-img rebase to rebase an image to
> > have no backing file, as opposed to merely allowing it to
> > rebase to an existing backing file.
> 
> You can already do that by rebasing to the empty string.  And it is
> feasible (although unlikely) to have a file named '-', where your patch
> would make it impossible to use that file directly (although you could
> still use './-').  NACK.

Also - is often used to tell tools that expect a file argument to use
stdin/out.  Something that would be quite useful for some qemu-img subcommands.