From: ludo@gnu.org (Ludovic Courtès)
To: Deck Pickard <deck.r.pickard@gmail.com>
Cc: guix-devel@gnu.org
Subject: Re: [PATCH] services: lsh: Add "graceful" handling of daemonic option.
Date: Sat, 06 Dec 2014 15:28:34 +0100 [thread overview]
Message-ID: <87k324zwbx.fsf@gnu.org> (raw)
In-Reply-To: <CAJ41eewv6GMBtoaTCiHmifiOMKsy6UkVripMxDjQAAFnh2qJgg@mail.gmail.com> (Deck Pickard's message of "Thu, 4 Dec 2014 23:24:02 +0100")
Deck Pickard <deck.r.pickard@gmail.com> skribis:
> From 1fef935d6292016c04b9234eedb5dcaf006dc152 Mon Sep 17 00:00:00 2001
> From: nebuli <nebu@kipple>
> Date: Wed, 3 Dec 2014 22:51:48 +0100
> Subject: [PATCH] services: lsh: Add graceful handling of daemonic option.
>
> * doc/guix.texi: Mention use case.
> * gnu/services/ssh.scm (lsh-service): New #:keys (daemonic?, pid-file?,
> pid-file). Build new lshd-command and expand service-requirement
> field.
Nice!
> (define* (lsh-service #:key
> (lsh lsh)
> + (daemonic? #f)
> (host-key "/etc/lsh/host-key")
> (interfaces '())
> (port-number 22)
> (allow-empty-passwords? #f)
> (root-login? #f)
> (syslog-output? #t)
> + (pid-file? #f)
> + (pid-file "/var/run/lshd.pid")
> (x11-forwarding? #t)
> (tcp/ip-forwarding? #t)
> (password-authentication? #t)
I would be tempted to not expose #:daemonic?, #:pid-file? and
#:syslog-output?, and instead always use --daemonic --pid-file=...
In particular, when using --daemonic, having the PID file is required,
otherwise dmd won’t know what the PID of this process is, and thus will
be unable to control it. For that reason, #:pid-file? must not be
exposed.
WDYT?
> + (define requires
> + (if (and daemonic? syslog-output?)
> + '(networking syslogd)
> + '(networking)))
If we agree on the above, that would become '(networking syslogd)
unconditionally.
> (return (service
> (documentation "GNU lsh SSH server")
> (provision '(ssh-daemon))
> - (requirement '(networking))
> + (requirement #~(#$@requires))
This is strictly equivalent to:
(requirement `(,@requires))
or simply:
(requirement requires)
:-)
G-expressions are only needed when capturing references to /gnu/store
items, packages, etc.
Thanks,
Ludo’.
next prev parent reply other threads:[~2014-12-06 14:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAJ41eewmqwPhQXZRJXdJuHGA=sSRJG7dK86sWfCgusb+AXBNxg@mail.gmail.com>
2014-12-04 22:24 ` [PATCH] services: lsh: Add "graceful" handling of daemonic option Deck Pickard
2014-12-06 14:28 ` Ludovic Courtès [this message]
2014-12-06 22:29 ` Deck Pickard
2015-02-08 20:56 ` Ludovic Courtès
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