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+;;; guix-forge --- Guix software forge meta-service
+;;; Copyright © 2021 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 (guix records)
+  #:export (guix-laminar-service-type
+            guix-laminar-configuration
+            guix-laminar-configuration-state-directory
+            guix-laminar-configuration-jobs
+            guix-laminar-job
+            guix-laminar-job?
+            guix-laminar-job-name
+            guix-laminar-job-run
+            guix-laminar-job-after
+            guix-laminar-group
+            guix-laminar-group?
+            guix-laminar-group-name
+            guix-laminar-group-regex))
+
+(define-record-type* <guix-laminar-configuration>
+  guix-laminar-configuration make-guix-laminar-configuration
+  guix-laminar-configuration?
+  (state-directory guix-laminar-configuration-state-directory
+                   (default "/var/lib/laminar"))
+  (jobs guix-laminar-configuration-jobs
+        (default '()))
+  (groups guix-laminar-configuration-groups
+          (default '())))
+
+(define-record-type* <guix-laminar-job>
+  guix-laminar-job make-guix-laminar-job
+  guix-laminar-job?
+  (name guix-laminar-job-name)
+  (run guix-laminar-job-run)
+  (after guix-laminar-job-after
+         (default #f)))
+
+(define-record-type* <guix-laminar-group>
+  guix-laminar-group make-guix-laminar-group
+  guix-laminar-group?
+  (name guix-laminar-group-name)
+  (regex guix-laminar-group-regex))
+
+(define (guix-laminar-activation config)
+  (let* ((state-directory (guix-laminar-configuration-state-directory config))
+         (groups-configuration (string-append state-directory "/cfg/groups.conf"))
+         (jobs-directory (string-append state-directory "/cfg/jobs")))
+    #~(begin
+        (use-modules (srfi srfi-26))
+
+        ;; Configure groups.
+        (when (file-exists? #$groups-configuration)
+          (delete-file #$groups-configuration))
+        (symlink
+         #$(plain-file "laminar-groups"
+                       (string-join (map (lambda (group)
+                                           (string-append (guix-laminar-group-name group)
+                                                          "="
+                                                          (guix-laminar-group-regex group)))
+                                         (guix-laminar-configuration-groups config))
+                                    "\n"))
+         #$groups-configuration)
+        ;; Create jobs directory and populate with job scripts.
+        (mkdir-p #$(dirname jobs-directory))
+        (when (file-exists? #$jobs-directory)
+          (delete-file #$jobs-directory))
+        (symlink
+         #$(file-union "laminar-jobs"
+                       (append-map (lambda (job)
+                                     (let ((name (guix-laminar-job-name job))
+                                           (run (guix-laminar-job-run job))
+                                           (after (guix-laminar-job-after job)))
+                                       (cons (list (string-append name ".run")
+                                                   (program-file name run))
+                                             (if after
+                                                 (list (list (string-append name ".after")
+                                                             (program-file name after)))
+                                                 (list)))))
+                                   (guix-laminar-configuration-jobs config)))
+         #$jobs-directory)
+        ;; Set permissions for laminar directory.
+        (for-each (lambda (file)
+                    (let ((user (getpw "laminar")))
+                      (chown file (passwd:uid user) (passwd:gid user))))
+                  (find-files #$state-directory
+                              (lambda (file stat)
+                                (memq (stat:type stat)
+                                      '(regular directory)))
+                              #:directories? #t)))))
+
+(define guix-laminar-service-type
+  (service-type
+   (name 'guix-laminar)
+   (description "Run guix-laminar.")
+   (extensions (list (service-extension activation-service-type
+                                        guix-laminar-activation)))
+   (compose concatenate)
+   (extend (lambda (config extended-values)
+             (guix-laminar-configuration
+              (inherit config)
+              (jobs (append (guix-laminar-configuration-jobs config)
+                            (filter guix-laminar-job? extended-values)))
+              (groups (append (guix-laminar-configuration-groups config)
+                              (filter guix-laminar-group? extended-values))))))
+   (default-value (guix-laminar-configuration))))