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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu system dmd)
#:use-module (guix store)
#:use-module (guix packages)
#:use-module (guix derivations)
#:use-module (guix records)
#:use-module ((gnu packages base)
#:select (glibc-final))
#:use-module ((gnu packages system)
#:select (mingetty inetutils))
#:use-module ((gnu packages package-management)
#:select (guix))
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (service?
service
service-provision
service-requirement
service-respawn?
service-start
service-stop
service-inputs
host-name-service
syslog-service
mingetty-service
nscd-service
guix-service
static-networking-service
dmd-configuration-file))
;;; Commentary:
;;;
;;; System services as cajoled by dmd.
;;;
;;; Code:
(define-record-type* <service>
service make-service
service?
(provision service-provision) ; list of symbols
(requirement service-requirement ; list of symbols
(default '()))
(respawn? service-respawn? ; Boolean
(default #t))
(start service-start) ; expression
(stop service-stop ; expression
(default #f))
(inputs service-inputs ; list of inputs
(default '())))
(define (host-name-service store name)
"Return a service that sets the host name to NAME."
(service
(provision '(host-name))
(start `(lambda _
(sethostname ,name)))
(respawn? #f)))
(define (mingetty-service store tty)
"Return a service to run mingetty on TTY."
(let* ((mingetty-drv (package-derivation store mingetty))
(mingetty-bin (string-append (derivation->output-path mingetty-drv)
"/sbin/mingetty")))
(service
(provision (list (symbol-append 'term- (string->symbol tty))))
;; Since the login prompt shows the host name, wait for the 'host-name'
;; service to be done.
(requirement '(host-name))
(start `(make-forkexec-constructor ,mingetty-bin "--noclear" ,tty))
(inputs `(("mingetty" ,mingetty))))))
(define* (nscd-service store
#:key (glibc glibc-final))
"Return a service that runs libc's name service cache daemon (nscd)."
(let ((nscd (string-append (package-output store glibc) "/sbin/nscd")))
(service
(provision '(nscd))
(start `(make-forkexec-constructor ,nscd "-f" "/dev/null"))
;; XXX: Local copy of 'make-kill-destructor' because the one upstream
;; uses the broken 'opt-lambda' macro.
(stop `(lambda* (#:optional (signal SIGTERM))
(lambda (pid . args)
(kill pid signal)
#f)))
(respawn? #f)
(inputs `(("glibc" ,glibc))))))
(define (syslog-service store)
"Return a service that runs 'syslogd' with reasonable default settings."
(define syslog.conf
;; Snippet adapted from the GNU inetutils manual.
(add-text-to-store store "syslog.conf" "
# Log all kernel messages, authentication messages of
# level notice or higher and anything of level err or
# higher to the console.
# Don't log private authentication messages!
*.err;kern.*;auth.notice;authpriv.none /dev/console
# Log anything (except mail) of level info or higher.
# Don't log private authentication messages!
*.info;mail.none;authpriv.none /var/log/messages
# Same, in a different place.
*.info;mail.none;authpriv.none /dev/tty12
# The authpriv file has restricted access.
authpriv.* /var/log/secure
# Log all the mail messages in one place.
mail.* /var/log/maillog
"))
(let* ((inetutils-drv (package-derivation store inetutils))
(syslogd (string-append (derivation->output-path inetutils-drv)
"/libexec/syslogd")))
(service
(provision '(syslogd))
(start `(make-forkexec-constructor ,syslogd
"--rcfile" ,syslog.conf))
(inputs `(("inetutils" ,inetutils)
("syslog.conf" ,syslog.conf))))))
(define* (guix-service store #:key (guix guix))
"Return a service that runs the build daemon from GUIX."
(let* ((drv (package-derivation store guix))
(daemon (string-append (derivation->output-path drv)
"/bin/guix-daemon")))
(service
(provision '(guix-daemon))
(start `(make-forkexec-constructor ,daemon))
(inputs `(("guix" ,guix))))))
(define* (static-networking-service store interface ip
#:key (inetutils inetutils))
"Return a service that starts INTERFACE with address IP."
;; TODO: Eventually we should do this using Guile's networking procedures,
;; like 'configure-qemu-networking' does, but the patch that does this is
;; not yet in stock Guile.
(let ((ifconfig (string-append (package-output store inetutils)
"/bin/ifconfig")))
(service
(provision '(networking))
(start `(make-forkexec-constructor ,ifconfig ,interface ,ip "up"))
(stop `(make-forkexec-constructor ,ifconfig ,interface "down"))
(respawn? #f)
(inputs `(("inetutils" ,inetutils))))))
(define (dmd-configuration-file store services)
"Return the dmd configuration file for SERVICES."
(define config
`(begin
(register-services
,@(map (match-lambda
(($ <service> provision requirement respawn? start stop)
`(make <service>
#:provides ',provision
#:requires ',requirement
#:respawn? ,respawn?
#:start ,start
#:stop ,stop)))
services))
(for-each start ',(append-map service-provision services))))
(add-text-to-store store "dmd.conf"
(object->string config)))
;;; dmd.scm ends here
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