;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Oleg Pykhalov <go.wigust@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 syncthing)
  #:use-module (gnu packages syncthing)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #:export (syncthing-configuration
            syncthing-configuration?
            syncthing-service-type))

;;; Commentary:
;;;
;;; This module provides a service definition for the syncthing service.
;;;
;;; Code:

(define-record-type* <syncthing-configuration>
  syncthing-configuration make-syncthing-configuration
  syncthing-configuration?
  (syncthing syncthing-configuration-syncthing ;file-like
             (default syncthing))
  (arguments syncthing-configuration-arguments ;list of strings
             (default '()))
  (logflags  syncthing-configuration-logflags  ;number
             (default 0))
  (user      syncthing-configuration-user)     ;string
  (group     syncthing-configuration-group     ;string
             (default "users"))
  (home      syncthing-configuration-home      ;string
             (default #f)))

(define syncthing-shepherd-service
  (match-lambda
    (($ <syncthing-configuration> syncthing arguments logflags user group home)
     (list
      (shepherd-service
       (provision (list
                   (or (and user (string->symbol (string-append "syncthing-" user)))
                       'syncthing)))
       (documentation "Run syncthing.")
       (requirement '(loopback))
       (modules '((srfi srfi-1) (shepherd support)))
       (start #~(make-forkexec-constructor
                 (append (list (string-append #$syncthing "/bin/syncthing")
                               "-no-browser"
                               "-no-restart"
                               (string-append "-logflags=" (number->string #$logflags)))
                         '#$arguments)
                 #:user #$user
                 #:group (and #$user #$group)
                 #:environment-variables
                 (append (list (string-append "HOME="
                                              (or #$home
                                                  (and #$user (passwd:dir (getpw #$user)))
                                                  user-homedir))
                               "SSL_CERT_DIR=/etc/ssl/certs"
                               "SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt")
                         (remove (lambda (str)
                                   (or (string-prefix? "HOME=" str)
                                       (string-prefix? "SSL_CERT_DIR=" str)
                                       (string-prefix? "SSL_CERT_FILE=" str)))
                                 (environ)))))
       (respawn? #f)
       (stop #~(make-kill-destructor)))))))

(define syncthing-service-type
  (service-type (name 'syncthing)
                (extensions (list (service-extension shepherd-root-service-type
                                                     syncthing-shepherd-service)))
                (description
                 "Run @uref{https://github.com/syncthing/syncthing, Syncthing}
decentralized continuous file system synchronization.")))

;;; syncthing.scm ends here