;;; GNU Guix --- Functional package management for GNU

;;; Copyright © 2020, 2021 Julien Lepiller <julien@lepiller.eu>

;;;

;;; 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/>.

;;;

;;; Some of the help text was taken from the default dovecot.conf files.

(define-module (services gitile)

  #:use-module (gnu services)

  #:use-module (gnu services base)

  #:use-module (gnu services configuration)

  #:use-module (gnu services shepherd)

  #:use-module (gnu services web)

  #:use-module (gnu system pam)

  #:use-module (gnu system shadow)

  #:use-module (gnu packages admin)

  #:use-module (packages gitile)

  #:use-module (guix gexp)

  #:use-module (guix records)

  #:use-module (ice-9 match)

  #:export (gitile-service-type

            gitile-configuration))

(define-record-type* <gitile-configuration>

  gitile-configuration make-gitile-configuration gitile-configuration?

  (package gitile-configuration-package

           (default gitile))

  (host gitile-configuration-host

        (default "localhost"))

  (port gitile-configuration-port

        (default 8080))

  (database gitile-configuration-database

            (default "/var/lib/gitile/gitile-db.sql"))

  (repositories gitile-configuration-repositories

                (default "/var/lib/gitolite/repositories"))

  (base-git-url gitile-configuration-base-git-url)

  (index-title gitile-configuration-index-title

               (default "Index"))

  (intro gitile-configuration-intro

         (default '()))

  (footer gitile-configuration-footer

          (default '()))

  (nginx gitile-configuration-nginx))

(define (gitile-config-file host port database repositories base-git-url

                            index-title intro footer)

  (define build

    #~(write `(config

                (port #$port)

                (host #$host)

                (database #$database)

                (repositories #$repositories)

                (base-git-url #$base-git-url)

                (index-title #$index-title)

                (intro #$intro)

                (footer #$footer))

             (open-output-file #$output)))

  (computed-file "gitile.conf" build))

(define gitile-nginx-server-block

  (match-lambda

    (($ <gitile-configuration> package host port database repositories

        base-git-url index-title intro footer nginx)

     (list (nginx-server-configuration

             (inherit nginx)

             (locations

               (append

                 (list

                   (nginx-location-configuration

                            (uri "/")

                            (body

                              (list

                                #~(string-append "proxy_pass http://" #$host

                                                 ":" (number->string #$port)

                                                 "/;")))))

                 (map

                   (lambda (loc)

                     (nginx-location-configuration

                       (uri loc)

                       (body

                         (list

                           #~(string-append "root " #$package "/share/gitile/assets;")))))

                   '("/css" "/js" "/images"))

                 (nginx-server-configuration-locations nginx))))))))

(define gitile-shepherd-service

  (match-lambda

    (($ <gitile-configuration> package host port database repositories

        base-git-url index-title intro footer nginx)

     (list (shepherd-service

             (provision '(gitile))

             (requirement '(loopback))

             (documentation "gitile")

             (start (let ((gitile (file-append package "/bin/gitile")))

                          #~(make-forkexec-constructor

                              `(,#$gitile "-c" #$(gitile-config-file

                                                   host port database

                                                   repositories

                                                   base-git-url index-title

                                                   intro footer))

                              #:user "gitile"

                              #:group "git")))

             (stop #~(make-kill-destructor)))))))

(define %gitile-accounts

  (list (user-account

          (name "gitile")

          (group "git")

          (system? #t)

          (comment "Gitile user")

          (home-directory "/var/empty")

          (shell (file-append shadow "/sbin/nologin")))))

(define gitile-service-type

  (service-type

    (name 'gitile)

    (description "gitile git forge service")

    (extensions

      (list (service-extension account-service-type

                               (const %gitile-accounts))

            (service-extension shepherd-root-service-type

                               gitile-shepherd-service)

            (service-extension nginx-service-type

                               gitile-nginx-server-block)))))