Make the syncthing service run syncthing, add syncthing-gtk service

The ‘syncthing-gtk’ program doesn't seem to start the syncthing daemon
automatically. In fact trying to start ‘syncthing-gtk’ through shepherd doesn't
seem to want to work at the moment, complaining that it can't close a bunch of
file descriptors.

oni/home/services/syncthing-gtk.scm

@@ -0,0 +1,48 @@
+(define-module (oni home services syncthing-gtk)
+  #:use-module (gnu services configuration)
+  #:use-module (gnu packages syncthing)
+  #:use-module (gnu home services)
+  #:use-module (gnu home services shepherd)
+  #:use-module (gnu home services utils)
+  #:use-module (guix packages)
+  #:use-module (guix gexp)
+
+  #:export (home-syncthing-gtk-service-type
+            home-syncthing-gtk-configuration))
+
+(define-configuration home-syncthing-gtk-configuration
+  (package
+   (package syncthing-gtk)
+   "Package to use for setting syncthing-gtk"))
+
+(define (add-syncthing-gtk-packages config)
+  (list (home-syncthing-gtk-configuration-package config)))
+
+(define (home-syncthing-gtk-shepherd-service config)
+  (list
+   (shepherd-service
+    (documentation "Start syncthing-gtk")
+    (provision '(syncthing-gtk syncthing-ui))
+    (requirement '(syncthing))
+    (auto-start? #t)
+    (start
+     #~(make-forkexec-constructor
+        (list #$(file-append (home-syncthing-gtk-configuration-package config) "/bin/syncthing-gtk")
+              "--minimized"
+              #:log-file (format #f "~a/.local/var/log/syncthing-gtk.log" (getenv "HOME")))))
+    (stop
+     #~(make-kill-destructor)))))
+
+(define home-syncthing-gtk-service-type
+  (service-type
+   (name 'home-syncthing-gtk)
+   (extensions
+    (list (service-extension
+           home-profile-service-type
+           add-syncthing-gtk-packages)
+          (service-extension
+           home-shepherd-service-type
+           home-syncthing-gtk-shepherd-service)))
+   (compose identity)
+   (default-value (home-syncthing-gtk-configuration))
+   (description "Install and configure syncthing-gtk.")))

oni/home/services/syncthing.scm

@@ -12,7 +12,7 @@
 
 (define-configuration home-syncthing-configuration
   (package
-   (package syncthing-gtk)
+   (package syncthing)
    "Package to use for setting syncthing"))
 
 (define (add-syncthing-packages config)
@@ -26,9 +26,10 @@
     (auto-start? #t)
     (start
      #~(make-forkexec-constructor
-        (list #$(file-append (home-syncthing-configuration-package config) "/bin/syncthing-gtk")
-              "--minimized"
-        #:log-file (format #f "~a/.local/var/log/syncthing.log" (getenv "HOME")))))
+        (list #$(file-append (home-syncthing-configuration-package config) "/bin/syncthing")
+              "serve"
+              "--logfile" (format #f "~a/.local/var/log/syncthing.log" (getenv "HOME"))
+              "--no-browser")))
     (stop
      #~(make-kill-destructor)))))