On Wed, Mar 27, 2013 at 10:12:42AM -0500, Anthony Liguori wrote:
> "Richard W.M. Jones" <rjo...@redhat.com> writes:
>
> > From: "Richard W.M. Jones" <rjo...@redhat.com>
> >
> > qemu-system-x86_64 -drive file=ssh://hostname/some/image
> >
> > QEMU will ssh into 'hostname' and open '/some/image' which is made
> > available as a standard block device.
> >
> > You can specify a username (ssh://user@host/...) and/or a port number
> > (ssh://host:port/...).
> >
> > Current limitations:
> >
> > - Authentication must be done without passwords or passphrases, using
> > ssh-agent. Other authentication methods are not supported. (*)
> >
> > - New remote files cannot be created. (*)
> >
> > - Uses a single connection, instead of concurrent AIO with multiple
> > SSH connections.
> >
> > (*) = potentially easy fix
> >
> > This is implemented using libssh2 on the client side. The server just
> > requires a regular ssh daemon with sftp-server support. Most ssh
> > daemons on Unix/Linux systems will work out of the box.
> >
> > Thanks: Stefan Hajnoczi, Kevin Wolf.
>
> Curl actually supports sftp already. In theory, we just need to add:
>
> static BlockDriver bdrv_sftp = {
> .format_name = "sftp",
> .protocol_name = "sftp",
>
> .instance_size = sizeof(BDRVCURLState),
> .bdrv_file_open = curl_open,
> .bdrv_close = curl_close,
> .bdrv_getlength = curl_getlength,
>
> .bdrv_aio_readv = curl_aio_readv,
> };
>
> To block/curl.c and it should Just Work. Have you considered doing
> this through curl?
Yes, and it doesn't work. See:
http://www.mail-archive.com/qemu-devel@nongnu.org/msg162605.html
(curl-based patch:
http://www.mail-archive.com/qemu-devel@nongnu.org/msg162253.html )
Rich.
--
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