gnu: services: Add readymedia service.

* gnu/services/upnp.scm, gnu/tests/upnp.scm: New files.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add them.
* doc/guix.texi (Miscellaneous Services): Document the service.

Change-Id: I6a3c9db9e7504df308038343ed48e4409a323581
Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

1 files changed, 207 insertions, 0 deletions

diff --git a/gnu/services/upnp.scm b/gnu/services/upnp.scm
new file mode 100644
index 0000000000..09121326fe
--- /dev/null
+++ b/gnu/services/upnp.scm
@@ -0,0 +1,207 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Fabio Natali <me@fabionatali.com>
+;;;
+;;; 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/>.
+
+(define-module (gnu services upnp)
+  #:use-module (gnu build linux-container)
+  #:use-module (gnu packages admin)
+  #:use-module (gnu packages upnp)
+  #:use-module (gnu services admin)
+  #:use-module (gnu services base)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu services)
+  #:use-module (gnu system file-systems)
+  #:use-module (gnu system shadow)
+  #:use-module (guix gexp)
+  #:use-module (guix least-authority)
+  #:use-module (guix modules)
+  #:use-module (guix records)
+  #:use-module (ice-9 match)
+  #:export (%readymedia-default-cache-directory
+            %readymedia-default-log-directory
+            %readymedia-default-port
+            %readymedia-log-file
+            %readymedia-user-account
+            %readymedia-user-group
+            readymedia-configuration
+            readymedia-configuration?
+            readymedia-configuration-readymedia
+            readymedia-configuration-port
+            readymedia-configuration-cache-directory
+            readymedia-configuration-extra-config
+            readymedia-configuration-friendly-name
+            readymedia-configuration-log-directory
+            readymedia-configuration-media-directories
+            readymedia-media-directory
+            readymedia-media-directory-path
+            readymedia-media-directory-types
+            readymedia-media-directory?
+            readymedia-service-type))
+
+;;; Commentary:
+;;;
+;;; UPnP services.
+;;;
+;;; Code:
+
+(define %readymedia-default-cache-directory "/var/cache/readymedia")
+(define %readymedia-default-log-directory "/var/log/readymedia")
+(define %readymedia-log-file "minidlna.log")
+(define %readymedia-user-group "readymedia")
+(define %readymedia-user-account "readymedia")
+
+(define-record-type* <readymedia-configuration>
+  readymedia-configuration make-readymedia-configuration
+  readymedia-configuration?
+  (readymedia readymedia-configuration-readymedia
+              (default readymedia))
+  (port readymedia-configuration-port
+        (default #f))
+  (cache-directory readymedia-configuration-cache-directory
+                   (default %readymedia-default-cache-directory))
+  (log-directory readymedia-configuration-log-directory
+                 (default %readymedia-default-log-directory))
+  (friendly-name readymedia-configuration-friendly-name
+                 (default #f))
+  (media-directories readymedia-configuration-media-directories)
+  (extra-config readymedia-configuration-extra-config
+                (default '())))
+
+;; READYMEDIA-MEDIA-DIR is a record that indicates the path of a media folder
+;; and the types of media included within it. Allowed individual types are the
+;; symbols 'A' for audio, 'V' for video, and 'P' for pictures. The types field
+;; can contain any combination of individual types; an empty list means that
+;; no type is specified.
+(define-record-type* <readymedia-media-directory>
+  readymedia-media-directory make-readymedia-media-directory
+  readymedia-media-directory?
+  (path readymedia-media-directory-path)
+  (types readymedia-media-directory-types
+         (default '())))
+
+(define (readymedia-configuration->config-file config)
+  "Return the ReadyMedia/MiniDLNA configuration file corresponding to CONFIG."
+  (match-record config <readymedia-configuration>
+    (port friendly-name cache-directory log-directory media-directories extra-config)
+    (apply mixed-text-file
+           "minidlna.conf"
+           "db_dir=" cache-directory "\n"
+           "log_dir=" log-directory "\n"
+           (if friendly-name
+               (string-append "friendly_name=" friendly-name "\n")
+               "")
+           (if port
+               (string-append "port=" (number->string port) "\n")
+               "")
+           (append (map (match-record-lambda <readymedia-media-directory>
+                            (path types)
+                          (apply string-append
+                                 "media_dir="
+                                 (append (map symbol->string types)
+                                         (match types
+                                           (() (list))
+                                           (_ (list ",")))
+                                         (list path))))
+                        media-directories)
+                   (map (match-lambda
+                          ((key . value)
+                           (string-append key "=" value "\n")))
+                        extra-config)))))
+
+(define (readymedia-shepherd-service config)
+  "Return a least-authority ReadyMedia/MiniDLNA Shepherd service."
+  (match-record config <readymedia-configuration>
+    (cache-directory log-directory media-directories)
+    (let ((minidlna-conf (readymedia-configuration->config-file config)))
+      (shepherd-service
+       (documentation "Run the ReadyMedia/MiniDLNA daemon.")
+       (provision '(readymedia))
+       (requirement '(networking user-processes))
+       (start
+        #~(make-forkexec-constructor
+           (list #$(least-authority-wrapper
+                    (file-append (readymedia-configuration-readymedia config)
+                                 "/sbin/minidlnad")
+                    #:name "minidlna"
+                    #:mappings
+                    (cons* (file-system-mapping
+                            (source cache-directory)
+                            (target source)
+                            (writable? #t))
+                           (file-system-mapping
+                            (source log-directory)
+                            (target source)
+                            (writable? #t))
+                           (file-system-mapping
+                            (source minidlna-conf)
+                            (target source))
+                           (map (lambda (directory)
+                                  (file-system-mapping
+                                   (source (readymedia-media-directory-path directory))
+                                   (target source)))
+                                media-directories))
+                    #:namespaces (delq 'net %namespaces))
+                 "-f"
+                 #$minidlna-conf
+                 "-S")
+           #:log-file #$(string-append log-directory "/" %readymedia-log-file)
+           #:user #$%readymedia-user-account
+           #:group #$%readymedia-user-group))
+       (stop #~(make-kill-destructor))))))
+
+(define readymedia-accounts
+  (list (user-account
+         (name "readymedia")
+         (group "readymedia")
+         (system? #t)
+         (comment "ReadyMedia/MiniDLNA daemon user")
+         (home-directory "/var/empty")
+         (shell (file-append shadow "/sbin/nologin")))
+        (user-group
+         (name "readymedia")
+         (system? #t))))
+
+(define (readymedia-activation config)
+  "Set up directories for ReadyMedia/MiniDLNA."
+  (match-record config <readymedia-configuration>
+    (cache-directory log-directory media-directories)
+    (with-imported-modules (source-module-closure '((gnu build activation)))
+      #~(begin
+          (use-modules (gnu build activation))
+
+          (for-each (lambda (directory)
+                      (unless (file-exists? directory)
+                        (mkdir-p/perms directory
+                                       (getpw #$%readymedia-user-account)
+                                       #o755)))
+                    (list #$cache-directory
+                          #$log-directory
+                          #$@(map readymedia-media-directory-path
+                                  media-directories)))))))
+
+(define readymedia-service-type
+  (service-type
+   (name 'readymedia)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             (compose list readymedia-shepherd-service))
+          (service-extension account-service-type
+                             (const readymedia-accounts))
+          (service-extension activation-service-type
+                             readymedia-activation)))
+   (description
+    "Run @command{minidlnad}, the ReadyMedia/MiniDLNA media server.")))