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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 ((gnu packages linux)
#:select (net-tools))
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (guix monads)
#: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?
(documentation service-documentation ; string
(default "[No documentation.]"))
(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 name)
"Return a service that sets the host name to NAME."
(with-monad %store-monad
(return (service
(documentation "Initialize the machine's host name.")
(provision '(host-name))
(start `(lambda _
(sethostname ,name)))
(respawn? #f)))))
(define (mingetty-service tty)
"Return a service to run mingetty on TTY."
(mlet %store-monad ((mingetty-bin (package-file mingetty "sbin/mingetty")))
(return
(service
(documentation (string-append "Run mingetty on " tty "."))
(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))
(stop `(make-kill-destructor))
(inputs `(("mingetty" ,mingetty)))))))
(define* (nscd-service #:key (glibc glibc-final))
"Return a service that runs libc's name service cache daemon (nscd)."
(mlet %store-monad ((nscd (package-file glibc "sbin/nscd")))
(return (service
(documentation "Run libc's name service cache daemon (nscd).")
(provision '(nscd))
(start `(make-forkexec-constructor ,nscd "-f" "/dev/null"
"--foreground"))
(stop `(make-kill-destructor))
(respawn? #f)
(inputs `(("glibc" ,glibc)))))))
(define (syslog-service)
"Return a service that runs 'syslogd' with reasonable default settings."
;; Snippet adapted from the GNU inetutils manual.
(define contents "
# 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
")
(mlet %store-monad
((syslog.conf (text-file "syslog.conf" contents))
(syslogd (package-file inetutils "libexec/syslogd")))
(return
(service
(documentation "Run the syslog daemon (syslogd).")
(provision '(syslogd))
(start `(make-forkexec-constructor ,syslogd "--no-detach"
"--rcfile" ,syslog.conf))
(stop `(make-kill-destructor))
(inputs `(("inetutils" ,inetutils)
("syslog.conf" ,syslog.conf)))))))
(define* (guix-service #:key (guix guix) (builder-group "guixbuild"))
"Return a service that runs the build daemon from GUIX."
(mlet %store-monad ((daemon (package-file guix "bin/guix-daemon")))
(return (service
(provision '(guix-daemon))
(start `(make-forkexec-constructor ,daemon
"--build-users-group"
,builder-group))
(stop `(make-kill-destructor))
(inputs `(("guix" ,guix)))))))
(define* (static-networking-service interface ip
#:key
gateway
(inetutils inetutils)
(net-tools net-tools))
"Return a service that starts INTERFACE with address IP. If GATEWAY is
true, it must be a string specifying the default network gateway."
;; 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.
(mlet %store-monad ((ifconfig (package-file inetutils "bin/ifconfig"))
(route (package-file net-tools "sbin/route")))
(return
(service
(documentation
(string-append "Set up networking on the '" interface
"' interface using a static IP address."))
(provision '(networking))
(start `(lambda _
;; Return #t if successfully started.
(and (zero? (system* ,ifconfig ,interface ,ip "up"))
,(if gateway
`(zero? (system* ,route "add" "-net" "default"
"gw" ,gateway))
#t))))
(stop `(lambda _
;; Return #f is successfully stopped.
(not (and (system* ,ifconfig ,interface "down")
(system* ,route "del" "-net" "default")))))
(respawn? #f)
(inputs `(("inetutils" ,inetutils)
,@(if gateway
`(("net-tools" ,net-tools))
'())))))))
(define (dmd-configuration-file services)
"Return the dmd configuration file for SERVICES."
(define config
`(begin
(register-services
,@(map (match-lambda
(($ <service> documentation provision requirement
respawn? start stop)
`(make <service>
#:docstring ,documentation
#:provides ',provision
#:requires ',requirement
#:respawn? ,respawn?
#:start ,start
#:stop ,stop)))
services))
(for-each start ',(append-map service-provision services))))
(text-file "dmd.conf" (object->string config)))
;;; dmd.scm ends here
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