Re: [Qemu-devel] [PATCH v2] ssh: switch from libssh2 to libssh

["Richard W.M. Jones" <rjones@redhat.com>]

On Fri, Oct 21, 2016 at 05:30:39PM +0200, Pino Toscano wrote:
> On Friday, 21 October 2016 13:02:21 CEST Richard W.M. Jones wrote:
> > On Fri, Oct 21, 2016 at 01:16:11PM +0200, Pino Toscano wrote:
> > > Rewrite the implementation of the ssh block driver to use libssh instead
> > > of libssh2.  The libssh library has various advantages over libssh2:
> > > - easier API for authentication (for example for using ssh-agent)
> > > - easier API for known_hosts handling
> > > - supports newer types of keys in known_hosts
> > > 
> > > Kerberos authentication can be enabled once the libssh bug for it [1] is
> > > fixed.
> > > 
> > > The development version of libssh (i.e. the future 0.8.x) supports
> > > fsync, so reuse the build time check for this.
> > > 
> > > [1] https://red.libssh.org/issues/242
> > > 
> > > Signed-off-by: Pino Toscano <ptoscano@redhat.com>
> > > ---
> > > 
> > > Changes from v1:
> > > - fixed jumbo packets writing
> > > - fixed missing 'err' assignment
> > > - fixed commit message
> > 
> > This version works, but I also switched from using a remote server to
> > using this over localhost.
> 
> Could you please give it a try with the remote server case as well?

I tried it and it failed with the remote server.  Same kinds of errors
as last time.

> > It seems as if the timeout might be a bit short.  Could that be made
> > controllable?  Or increased to match whatever libssh2 was using?
> 
> Which timeout are you referring to?

Not any particular thing, I just observed that with the remote server
the errors happen quite quickly, and so perhaps there is a shorter
timeout.  (libssh2 apparently defaults to unlimited waiting, although
I'm sure there are other timeouts in ssh or TCP which kick in).)

Rich.

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