services: Add qbittorrent-service-type.

* rosenthal/services/bittorrent.scm: New file.
(qbittorrent-configuration,%qbittorrent-accounts,qbittorrent-activation)
(qbittorrent-shepherd-service,qbittorrent-service-type): New variables.

rosenthal/services/bittorrent.scm

@@ -0,0 +1,89 @@
+;; SPDX-FileCopyrightText: 2022 Hilton Chain <hako@ultrarare.space>
+;;
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+(define-module (rosenthal services bittorrent)
+  #:use-module (ice-9 match)
+  #:use-module (guix gexp)
+  #:use-module (guix packages)
+  #:use-module (gnu packages admin)
+  #:use-module (gnu services)
+  #:use-module (gnu services configuration)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu system shadow)
+  #:use-module (rosenthal packages bittorrent)
+  #:export (qbittorrent-configuration
+            qbittorrent-service-type))
+
+;;
+;; qBittorrent
+;;
+
+
+(define-configuration/no-serialization qbittorrent-configuration
+  (qbittorrent
+   (package qbittorrent-enhanced-edition-nox)
+   "The qBittorrent package to use, we need @command{qbittorrent-nox}.")
+  (log-file
+   (string "/var/log/qbittorrent.log")
+   "Where the logs go.")
+  (webui-port
+   (integer 8080)
+   "Change the Web UI port.")
+  (profile-directory
+   (string "/var/lib/qbittorrent")
+   "Directory to store configuration files in.")
+  (extra-options
+   (list-of-strings '())
+   "List of extra options."))
+
+(define %qbittorrent-accounts
+  (list (user-group (name "qbittorrent") (system? #t))
+        (user-account
+         (name "qbittorrent")
+         (group "qbittorrent")
+         (system? #t)
+         (comment "qBittorrent user")
+         (home-directory "/var/empty")
+         (shell (file-append shadow "/sbin/nologin")))))
+
+(define (qbittorrent-activation config)
+  #~(begin
+      (use-modules (guix build utils))
+      (let ((profile-directory #$(qbittorrent-configuration-profile-directory config))
+            (user (getpwnam "qbittorrent")))
+        (mkdir-p profile-directory)
+        (chown profile-directory (passwd:uid user) (passwd:gid user)))))
+
+(define qbittorrent-shepherd-service
+  (match-lambda
+    (($ <qbittorrent-configuration> qbittorrent
+                                    log-file webui-port profile-directory
+                                    extra-options)
+     (list (shepherd-service
+            (documentation "Run qbittorrent.")
+            (provision '(qbittorrent))
+            (requirement '(loopback))
+            (start #~(make-forkexec-constructor
+                      (list #$(file-append qbittorrent "/bin/qbittorrent-nox")
+                            #$(string-append "--webui-port=" (number->string webui-port))
+                            #$(string-append "--profile=" profile-directory)
+                            #$@extra-options)
+                      #:user "qbittorrent"
+                      #:group "qbittorrent"
+                      #:log-file #$log-file
+                      #:environment-variables '("QBT_ACCEPTED=true")))
+            (stop #~(make-kill-destructor)))))))
+
+(define qbittorrent-service-type
+  (service-type
+   (name 'qbittorrent)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             qbittorrent-shepherd-service)
+          (service-extension activation-service-type
+                             qbittorrent-activation)
+          (service-extension account-service-type
+                             (const %qbittorrent-accounts))))
+   (default-value (qbittorrent-configuration))
+   (description "Run qBittorrent daemon.")))