nongnu: Add grafana-service-type.

* nongnu/services/grafana.scm: New file.
(<grafana-configuration>): New data type.
(grafana-shepherd-service, grafana-service-type): New variables.

nongnu/services/grafana.scm

@@ -0,0 +1,43 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
+;;; Copyright © 2023 Petr Hodina <phodina@protonmail.com>
+
+(define-module (nongnu services grafana)
+  #:use-module (gnu packages)
+  #:use-module (nongnu packages grafana)
+  #:use-module (gnu services)
+  #:use-module (gnu services base)
+  #:use-module (gnu services shepherd)
+  #:use-module (guix gexp)
+  #:use-module (guix records)
+  #:export (grafana-configuration
+            grafana-configuration?
+            grafana-configuration-record?
+            grafana-service-type))
+
+(define-record-type* <grafana-configuration>
+  grafana-configuration make-grafana-configuration
+  grafana-configuration?
+  ;; TODO: Port, HTTPS, plugins?
+  (grafana grafana-configuration-package
+                   (default (list grafana-bin))))         ; package
+
+;; Add config file
+(define (grafana-shepherd-service config)
+  (list (shepherd-service
+         (documentation "Run Grafana server.")
+         (provision '(grafana))
+         (requirement '(user-processes))
+		 (start #~(make-forkexec-constructor
+                      (list (string-append grafana
+                                           "/bin/grafana-server")
+					  "-homepath" grafana)))
+            (stop #~(make-kill-destructor)))))
+
+(define grafana-service-type
+  (service-type
+   (name 'grafana)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             grafana-shepherd-service)))
+   (default-value (grafana-configuration))
+   (description "Run Grafana server.")))