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;;; guix-forge --- Guix software forge meta-service
;;; Copyright © 2021–2022, 2024 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of guix-forge.
;;;
;;; guix-forge 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.
;;;
;;; guix-forge 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 guix-forge.  If not, see
;;; <https://www.gnu.org/licenses/>.

(define-module (forge laminar)
  #:use-module (gnu)
  #:use-module (srfi srfi-1)
  #:use-module (gnu packages ci)
  #:use-module (gnu services ci)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:export (forge-laminar-service-type
            forge-laminar-configuration
            forge-laminar-configuration?
            forge-laminar-configuration-state-directory
            forge-laminar-configuration-jobs
            forge-laminar-configuration-contexts
            forge-laminar-configuration-groups
            forge-laminar-job
            forge-laminar-job?
            this-forge-laminar-job
            forge-laminar-job-name
            forge-laminar-job-run
            forge-laminar-job-after
            forge-laminar-job-trigger?
            forge-laminar-job-contexts
            forge-laminar-context
            forge-laminar-context?
            forge-laminar-context-name
            forge-laminar-context-executors
            forge-laminar-group
            forge-laminar-group?
            forge-laminar-group-name
            forge-laminar-group-regex))

(define-record-type* <forge-laminar-configuration>
  forge-laminar-configuration make-forge-laminar-configuration
  forge-laminar-configuration?
  (state-directory forge-laminar-configuration-state-directory
                   (default "/var/lib/laminar"))
  (jobs forge-laminar-configuration-jobs
        (default '()))
  (contexts forge-laminar-configuration-contexts
            (default '()))
  (groups forge-laminar-configuration-groups
          (default '())))

(define-record-type* <forge-laminar-job>
  forge-laminar-job make-forge-laminar-job
  forge-laminar-job?
  this-forge-laminar-job
  (name forge-laminar-job-name)
  (run forge-laminar-job-run (thunked))
  (after forge-laminar-job-after
         (default #f))
  (trigger? forge-laminar-job-trigger?
            (default #t))
  (contexts forge-laminar-job-contexts
            (default '())))

(define-record-type* <forge-laminar-context>
  forge-laminar-context make-forge-laminar-context
  forge-laminar-context?
  (name forge-laminar-context-name)
  (executors forge-laminar-context-executors))

(define-record-type* <forge-laminar-group>
  forge-laminar-group make-forge-laminar-group
  forge-laminar-group?
  (name forge-laminar-group-name)
  (regex forge-laminar-group-regex))

(define (laminar-contexts contexts)
  "Return a file-like object describing a directory of @var{contexts}, a
list of @var{<forge-laminar-context>} objects."
  (file-union "laminar-contexts"
              (map (lambda (context)
                     (let ((configuration-file
                            (string-append (forge-laminar-context-name context)
                                           ".conf")))
                       (list configuration-file
                             (mixed-text-file configuration-file
                                              "EXECUTORS="
                                              (number->string (forge-laminar-context-executors context))
                                              "\n"))))
                   contexts)))

(define (laminar-groups groups)
  "Return a file-like object describing @var{groups}, a list of
@code{<forge-laminar-groups>} objects."
  (plain-file "laminar-groups"
              (string-join (map (lambda (group)
                                  (string-append (forge-laminar-group-name group)
                                                 "="
                                                 (forge-laminar-group-regex group)))
                                groups)
                           "\n")))

(define (laminar-jobs jobs)
  "Return a file-like object describing a directory of @var{jobs}, a list
of @var{<forge-laminar-job>} objects."
  (file-union "laminar-jobs"
              (append-map (lambda (job)
                            (let ((name (forge-laminar-job-name job)))
                              `(,(let ((run-name (string-append name ".run")))
                                   `(,run-name ,(program-file run-name
                                                              (forge-laminar-job-run job))))
                                ,@(let ((after (forge-laminar-job-after job))
                                        (after-name (string-append name ".after")))
                                    (if after
                                        `((,after-name ,(program-file after-name after)))
                                        '()))
                                ,@(match (forge-laminar-job-contexts job)
                                    (() '())
                                    (contexts
                                     (let ((conf-name (string-append name ".conf")))
                                       `((,conf-name ,(mixed-text-file conf-name
                                                                       "CONTEXTS="
                                                                       (string-join contexts ",")
                                                                       "\n")))))))))
                          jobs)))

(define (forge-laminar-activation config)
  (let* ((state-directory (forge-laminar-configuration-state-directory config))
         (configuration-directory (string-append state-directory "/cfg"))
         (contexts-directory (string-append configuration-directory "/contexts"))
         (groups-configuration (string-append configuration-directory "/groups.conf"))
         (jobs-directory (string-append configuration-directory "/jobs")))
    (with-imported-modules '((guix build utils))
      #~(begin
          (use-modules (guix build utils))

          ;; Ensure configuration directory exists.
          (mkdir-p #$configuration-directory)
          ;; Configure contexts.
          (switch-symlinks #$contexts-directory
                           #$(laminar-contexts (forge-laminar-configuration-contexts config)))
          ;; Configure groups.
          (switch-symlinks #$groups-configuration
                           #$(laminar-groups (forge-laminar-configuration-groups config)))
          ;; Create jobs directory and populate with job scripts.
          (switch-symlinks #$jobs-directory
                           #$(laminar-jobs (forge-laminar-configuration-jobs config)))
          ;; Set permissions for laminar directory.
          (for-each (lambda (file)
                      (let ((user (getpw "laminar")))
                        (chown file (passwd:uid user) (passwd:gid user))))
                    (find-files #$state-directory
                                (lambda (file stat)
                                  (memq (stat:type stat)
                                        '(regular directory)))
                                #:directories? #t))))))

(define forge-laminar-service-type
  (service-type
   (name 'forge-laminar)
   (description "Run forge-laminar.")
   (extensions (list (service-extension activation-service-type
                                        forge-laminar-activation)
                     ;; Extend the laminar service with a dummy value,
                     ;; thus requiring it.
                     (service-extension laminar-service-type
                                        (const #t))))
   (compose concatenate)
   (extend (lambda (config extended-values)
             (forge-laminar-configuration
              (inherit config)
              (jobs (append (forge-laminar-configuration-jobs config)
                            (filter forge-laminar-job? extended-values)))
              (contexts (append (forge-laminar-configuration-contexts config)
                                (filter forge-laminar-context? extended-values)))
              (groups (append (forge-laminar-configuration-groups config)
                              (filter forge-laminar-group? extended-values))))))
   (default-value (forge-laminar-configuration))))