bug#41702: `guix environment` performance issues

[Lars-Dominik Braun]

Hey,

> What we need is Guile-SSH bindings for ‘ssh_get_fd’, which would allow
> us to get at the actual file descriptor after the connection has been
> opened, and to set TCP_NODELAY there:
> 
>   
> http://api.libssh.org/stable/group__libssh__session.html#gafe509fcea47714b5cd277d1e35e83276
> 
> It’s not 100% clear though if it returns that “right” FD when there’s a
> proxy command.
wouldn’t it be easier to add the SSH_OPTIONS_NODELAY option (see [1]) to
guile-ssh (should be trivial[2]) and let guile-ssh handle all the connection
stuff without touching the socket? Or do we need the raw socket elsewhere?

Cheers,
Lars

[1] 
http://api.libssh.org/stable/group__libssh__session.html#ga7a801b85800baa3f4e16f5b47db0a73d
[2] 
https://github.com/artyom-poptsov/guile-ssh/blob/master/libguile-ssh/session-func.c#L52

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