Re: [Qemu-devel] [PATCH] block: Add support for Secure Shell (ssh) block device.

[Stefan Hajnoczi]

On Thu, Mar 21, 2013 at 2:38 PM, Richard W.M. Jones <address@hidden> wrote:
> From: "Richard W.M. Jones" <address@hidden>
>
>   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://address@hidden/...) 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. (*)
>
> - Does not check host key. (*)
>
> - New remote files cannot be created. (*)
>
> - Uses coroutine read/write, instead of true AIO.  (libssh2 supports
>   non-blocking access, so this could be fixed with some effort).
>
> - Blocks during connection and authentication.
>
> (*) = 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.
> ---
>  block/Makefile.objs |   1 +
>  block/ssh.c         | 514 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  configure           |  47 +++++
>  qemu-doc.texi       |  28 +++
>  4 files changed, 590 insertions(+)
>  create mode 100644 block/ssh.c

Just noticed that libcurl supports sftp.

Did you try enabling sftp support in block/curl.c?  I think you just
need to add CURLPROTO_SFTP to #define PROTOCOLS.

Stefan