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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Sou Bunnbu <iyzsong@gmail.com>
;;; Copyright © 2016, 2017, 2018, 2020, 2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Huang Ying <huang.ying.caritas@gmail.com>
;;;
;;; 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 services dict)
#:use-module (guix gexp)
#:use-module (guix records)
#:use-module (guix modules)
#:use-module (guix least-authority)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu system shadow)
#:use-module ((gnu packages admin) #:select (shadow))
#:use-module (gnu packages dico)
#:use-module (gnu packages dictionaries)
#:autoload (gnu build linux-container) (%namespaces)
#:autoload (gnu system file-systems) (file-system-mapping)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (dicod-service
dicod-service-type
dicod-configuration
dicod-handler
dicod-database
%dicod-database:gcide))
;;;
;;; GNU Dico.
;;;
(define-record-type* <dicod-configuration>
dicod-configuration make-dicod-configuration
dicod-configuration?
(dico dicod-configuration-dico (default dico))
(interfaces dicod-configuration-interfaces ;list of strings
(default '("localhost")))
(handlers dicod-configuration-handlers ;list of <dicod-handler>
(default '()))
(databases dicod-configuration-databases ;list of <dicod-database>
(default (list %dicod-database:gcide))))
(define-record-type* <dicod-handler>
dicod-handler make-dicod-handler
dicod-handler?
(name dicod-handler-name)
(module dicod-handler-module (default #f))
(options dicod-handler-options (default '())))
(define-record-type* <dicod-database>
dicod-database make-dicod-database
dicod-database?
(name dicod-database-name)
(handler dicod-database-handler)
(complex? dicod-database-complex? (default #f))
(options dicod-database-options (default '())))
(define %dicod-database:gcide
(dicod-database
(name "gcide")
(handler "gcide")
(options (list #~(string-append "dbdir=" #$gcide "/share/gcide")
"idxdir=/var/run/dicod"))))
(define %dicod-accounts
(list (user-group
(name "dicod")
(system? #t))
(user-account
(name "dicod")
(group "dicod")
(system? #t)
(home-directory "/var/empty")
(shell (file-append shadow "/sbin/nologin")))))
(define (dicod-configuration-file config)
(define handler->text
(match-lambda
(($ <dicod-handler> name #f '())
`("
load-module " ,name ";"))
(($ <dicod-handler> name #f options)
(handler->text (dicod-handler
(name name)
(module name)
(options options))))
(($ <dicod-handler> name module options)
`("
load-module " ,name " {
command \"" ,module (string-join (list ,@options) " " 'prefix) "\";
}\n"))))
(define database->text
(match-lambda
(($ <dicod-database> name handler #f options)
(append
(handler->text (dicod-handler
(name handler)))
(database->text (dicod-database
(name name)
(handler handler)
(complex? #t)
(options options)))))
(($ <dicod-database> name handler complex? options)
`("
database {
name \"" ,name "\";
handler \"" ,handler
(string-join (list ,@options) " " 'prefix) "\";
}\n"))))
(define configuration->text
(match-lambda
(($ <dicod-configuration> dico (interfaces ...) handlers databases)
(append `("listen ("
,(string-join interfaces ", ") ");\n")
(append-map handler->text handlers)
(append-map database->text databases)))))
(apply mixed-text-file "dicod.conf" (configuration->text config)))
(define %dicod-activation
#~(begin
(use-modules (guix build utils))
(let ((user (getpwnam "dicod"))
(rundir "/var/run/dicod"))
(mkdir-p rundir)
(chown rundir (passwd:uid user) (passwd:gid user)))))
(define (dicod-shepherd-service config)
(let* ((dicod.conf (dicod-configuration-file config))
(interfaces (dicod-configuration-interfaces config))
(dicod (least-authority-wrapper
(file-append (dicod-configuration-dico config)
"/bin/dicod")
#:name "dicod"
#:mappings (list (file-system-mapping
(source "/var/run/dicod")
(target source)
(writable? #t))
(file-system-mapping
(source "/dev/log")
(target source))
(file-system-mapping
(source dicod.conf)
(target source)))
#:namespaces (delq 'net %namespaces))))
(list (shepherd-service
(provision '(dicod))
(requirement '(user-processes))
(documentation "Run the dicod daemon.")
(start #~(if (and (defined? 'make-inetd-constructor)
#$(= 1 (length interfaces))) ;XXX
(make-inetd-constructor
(list #$dicod "--inetd" "--foreground"
(string-append "--config=" #$dicod.conf))
(addrinfo:addr
(car (getaddrinfo #$(first interfaces) "dict")))
#:user "dicod" #:group "dicod"
#:service-name-stem "dicod")
(make-forkexec-constructor
(list #$dicod "--foreground"
(string-append "--config=" #$dicod.conf))
#:user "dicod" #:group "dicod")))
(stop #~(if (and (defined? 'make-inetd-destructor)
#$(= 1 (length interfaces))) ;XXX
(make-inetd-destructor)
(make-kill-destructor)))
(actions (list (shepherd-configuration-action dicod.conf)))))))
(define dicod-service-type
(service-type
(name 'dict)
(extensions
(list (service-extension account-service-type
(const %dicod-accounts))
(service-extension activation-service-type
(const %dicod-activation))
(service-extension shepherd-root-service-type
dicod-shepherd-service)))
(default-value (dicod-configuration))
(description
"Run @command{dicod}, the dictionary server of
@uref{https://www.gnu.org/software/dico, GNU Dico}. @command{dicod}
implements the standard DICT protocol supported by clients such as
@command{dico} and GNOME Dictionary.")))
(define* (dicod-service #:key (config (dicod-configuration)))
"Return a service that runs the @command{dicod} daemon, an implementation
of DICT server (@pxref{Dicod,,, dico, GNU Dico Manual}).
The optional @var{config} argument specifies the configuration for
@command{dicod}, which should be a @code{<dicod-configuration>} object, by
default it serves the GNU Collaborative International Dictionary of English.
You can add @command{open localhost} to your @file{~/.dico} file to make
@code{localhost} the default server for @command{dico}
client (@pxref{Initialization File,,, dico, GNU Dico Manual})."
(service dicod-service-type config))
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