#41702 - `guix environment` performance issues

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

Message #33 received at 41702@debbugs.gnu.org (full text, mbox, reply):

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From: Ludovic Courtès <ludo@gnu.org>
To: Lars-Dominik Braun <ldb@leibniz-psychology.org>
Subject: Re: bug#41702: `guix environment` performance issues
References: <20200604082316.GA3146@zpidnp36> <87mu5gtbwg.fsf@gnu.org>
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Date: Wed, 01 Jul 2020 12:49:51 +0200
In-Reply-To: <87wo3sjjdw.fsf@gnu.org> ("Ludovic
 \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
 \=\?utf-8\?Q\?s\?\= message of "Sat, 27 Jun 2020 23:20:27 +0200")
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Hi,

Ludovic Courtès <ludo@gnu.org> skribis:

> +    (when open-connection
> +      (let* ((sock (open-connection host port)))
> +        ;; Since 'session-set!' doesn't increase the revealed count of SOCK
> +        ;; (as of Guile-SSH 0.12.0), do it ourselves.
> +        (set-port-revealed! sock 1)
> +        (session-set! session 'fd sock)))

The problem with this approach is that ‘open-connection’ is past the raw
host name; aliases, proxy commands, etc. from ~/.ssh/config are ignored.

So it cannot go in as is.  :-/

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.

Ludo’.

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#41702 `guix environment` performance issues