services: greetd: Improve greeter configurations.

This improvement focuses on providing common user session scripts
for use by multiple greeters. Now user session entry point is
factored out into '<greetd-user-session>', which can be reused
as is with different greeters. By default it uses 'bash' as
first user process. Then user normally starts additional programs
with '.profile' or '.bashrc'. Using 'command', 'command-args' and
'extra-env' one can specify something else, which could be
'dbus-session' wrapped process, some desktop environment or else.
While the above is possible, one is still encouraged to use
'.bashrc', '.profile' or similar.

It also fixes incorrect use of 'XDG_RUNTIME_DIR' for 'wlgreet'.
'wlgreet' requires a compositor to run. We provide common sway based
greeter script, which can be shared by other graphical greeters.

* gnu/services/base.scm (<greetd-user-session>): Common user session
factored out, for shared use by multiple greeters.
(<greetd-agreety-session>): Switch to common user session.
(<greetd-wlgreet-configuration>): Refactor 'wlgreet' configuration.
(<greetd-wlgreet-sway-session>): Switch to common user session.
(<greetd-terminal-configuration>): Add 'extra-shepherd-requirement'
for establishing configurable Shepherd service dependency.
* gnu/tests/desktop.scm (%minimal-services): Reflect configuration
changes.
* doc/guix.texi (Base Services): Document refactoring changes.

Change-Id: I9d45a592b355eb9c438be5b1d4d15555ce4956fa
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/services/base.scm

@@ -16,7 +16,7 @@
 ;;; Copyright © 2021 qblade <qblade@protonmail.com>
 ;;; Copyright © 2021 Hui Lu <luhuins@163.com>
 ;;; Copyright © 2021, 2022, 2023 Maxim Cournoyer <maxim.cournoyer@gmail.com>
-;;; Copyright © 2021 muradm <mail@muradm.net>
+;;; Copyright © 2021, 2025 muradm <mail@muradm.net>
 ;;; Copyright © 2022 Guillaume Le Vaillant <glv@posteo.net>
 ;;; Copyright © 2022 Justin Veilleux <terramorpha@cock.li>
 ;;; Copyright © 2022 ( <paren@disroot.org>
@@ -274,8 +274,10 @@
             greetd-service-type
             greetd-configuration
             greetd-terminal-configuration
+            greetd-user-session
             greetd-agreety-session
-            greetd-wlgreet-session
+            greetd-wlgreet-session  ; deprecated
+            greetd-wlgreet-configuration
             greetd-wlgreet-sway-session
 
             %base-services))
@@ -3393,87 +3395,220 @@ to handle."
 ;;; greetd-service-type -- minimal and flexible login manager daemon
 ;;;
 
+(define-record-type* <greetd-user-session>
+  greetd-user-session make-greetd-user-session greetd-user-session?
+  (command greetd-user-session-command (default (file-append bash "/bin/bash")))
+  (command-args greetd-user-session-command-args (default '("-l")))
+  (extra-env greetd-user-session-extra-env (default '()))
+  (xdg-session-type greetd-user-session-xdg-session-type (default "tty"))
+  (xdg-env? greetd-user-session-xdg-env? (default #t)))
+
+(define (make-greetd-user-session-command config)
+  (match-record config <greetd-user-session>
+                (command command-args extra-env)
+                (program-file
+                 "greetd-user-session-command"
+                 #~(begin
+                     (use-modules (ice-9 match))
+                     (for-each (match-lambda ((var . val) (setenv var val)))
+                               (quote (#$@extra-env)))
+                     (apply execl #$command #$command
+                            (list #$@command-args))))))
+
+(define (make-greetd-xdg-user-session-command config)
+  (match-record config <greetd-user-session>
+                (command command-args extra-env xdg-session-type)
+                (program-file
+                 "greetd-xdg-user-session-command"
+                 #~(begin
+                     (use-modules (ice-9 match))
+                     (let* ((username (getenv "USER"))
+                            (useruid (passwd:uid (getpwuid username)))
+                            (useruid (number->string useruid)))
+                       (setenv "XDG_SESSION_TYPE" #$xdg-session-type)
+                       (setenv "XDG_RUNTIME_DIR"
+                               (string-append "/run/user/" useruid)))
+                     (for-each (match-lambda ((var . val) (setenv var val)))
+                               (quote (#$@extra-env)))
+                     (apply execl #$command #$command
+                            (list #$@command-args))))))
+
+(define-gexp-compiler (greetd-user-session-compiler
+                       (session <greetd-user-session>)
+                       system target)
+  (lower-object
+   ((if (greetd-user-session-xdg-env? session)
+        make-greetd-xdg-user-session-command
+        make-greetd-user-session-command) session)))
+
 (define-record-type* <greetd-agreety-session>
-  greetd-agreety-session make-greetd-agreety-session
-  greetd-agreety-session?
-  (agreety greetd-agreety (default greetd))
-  (command greetd-agreety-command (default (file-append bash "/bin/bash")))
-  (command-args greetd-agreety-command-args (default '("-l")))
-  (extra-env greetd-agreety-extra-env (default '()))
-  (xdg-env? greetd-agreety-xdg-env? (default #t)))
+  greetd-agreety-session make-greetd-agreety-session greetd-agreety-session?
+  (agreety greetd-agreety-session-agreety (default greetd))
+  (command greetd-agreety-session-command
+           (default (greetd-user-session))
+           (sanitize warn-greetd-agreety-session-command-type))
+  (command-args greetd-agreety-command-args
+                (default #nil)
+                (sanitize warn-deprecated-greetd-agreety-command-args))
+  (extra-env greetd-agreety-extra-env
+             (default #nil)
+             (sanitize warn-deprecated-greetd-agreety-extra-env))
+  (xdg-env? greetd-agreety-xdg-env?
+            (default #nil)
+            (sanitize warn-deprecated-greetd-agreety-xdg-env?)))
 
-(define (greetd-agreety-tty-session-command config)
-  (match-record config <greetd-agreety-session>
-    (command command-args extra-env)
-    (program-file
-     "agreety-tty-session-command"
-     #~(begin
-         (use-modules (ice-9 match))
-         (for-each (match-lambda ((var . val) (setenv var val)))
-                   (quote (#$@extra-env)))
-         (apply execl #$command #$command (list #$@command-args))))))
+(define (warn-deprecated-greetd-agreety-command-args value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'command-args #f
+     #:replacement '<greetd-user-seesion>))
+  value)
 
-(define (greetd-agreety-tty-xdg-session-command config)
-  (match-record config <greetd-agreety-session>
-    (command command-args extra-env)
-    (program-file
-     "agreety-tty-xdg-session-command"
-     #~(begin
-         (use-modules (ice-9 match))
-         (let*
-             ((username (getenv "USER"))
-              (useruid (passwd:uid (getpwuid username)))
-              (useruid (number->string useruid)))
-           (setenv "XDG_SESSION_TYPE" "tty")
-           (setenv "XDG_RUNTIME_DIR" (string-append "/run/user/" useruid)))
-         (for-each (match-lambda ((var . val) (setenv var val)))
-                   (quote (#$@extra-env)))
-         (apply execl #$command #$command (list #$@command-args))))))
+(define (warn-deprecated-greetd-agreety-extra-env value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'extra-env #f
+     #:replacement '<greetd-user-seesion>))
+  value)
+
+(define (warn-deprecated-greetd-agreety-xdg-env? value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'xdg-env? #f
+     #:replacement '<greetd-user-seesion>))
+  value)
+
+(define-deprecated/alias greetd-agreety greetd-agreety-session-agreety)
+(define-deprecated/alias greetd-agreety-command greetd-agreety-session-command)
+
+(define (warn-greetd-agreety-session-command-type value)
+  (unless (greetd-user-session? value)
+    (warn-about-deprecation
+     "arbitrary command" #f
+     #:replacement '<greetd-user-session>))
+  value)
+
+(define (greetd-agreety-session-to-user-session session default-command)
+  (let ((command (greetd-agreety-session-command session))
+        (command-args (or (greetd-agreety-command-args session)
+                          (greetd-user-session-command-args default-command)))
+        (extra-env (or (greetd-agreety-extra-env session)
+                       (greetd-user-session-extra-env default-command)))
+        (xdg-env? (or (greetd-agreety-xdg-env? session)
+                      (greetd-user-session-xdg-env? default-command))))
+    (greetd-user-session
+     (command command)
+     (command-args command-args)
+     (extra-env extra-env)
+     (xdg-env? xdg-env?))))
 
 (define-gexp-compiler (greetd-agreety-session-compiler
                        (session <greetd-agreety-session>)
                        system target)
-  (let ((agreety (file-append (greetd-agreety session)
-                              "/bin/agreety"))
-        (command ((if (greetd-agreety-xdg-env? session)
-                      greetd-agreety-tty-xdg-session-command
-                      greetd-agreety-tty-session-command)
-                  session)))
+  (let* ((agreety
+          (file-append (greetd-agreety-session-agreety session) "/bin/agreety"))
+         (command
+          (greetd-agreety-session-command session))
+         (command
+          (if (greetd-user-session? command)
+              command
+              (greetd-agreety-session-to-user-session
+               session
+               (greetd-user-session)))))
     (lower-object
-     (program-file "agreety-command"
-       #~(execl #$agreety #$agreety "-c" #$command)))))
+     (program-file
+      "agreety-wrapper"
+      #~(execl #$agreety #$agreety "-c" #$command)))))
 
-(define-record-type* <greetd-wlgreet-session>
-  greetd-wlgreet-session make-greetd-wlgreet-session
-  greetd-wlgreet-session?
-  (wlgreet greetd-wlgreet (default wlgreet))
+(define (make-greetd-sway-greeter-command sway sway-config)
+  (let ((sway-bin (file-append sway "/bin/sway")))
+    (program-file
+     "greeter-sway-command"
+     (with-imported-modules '((guix build utils))
+       #~(begin
+           (use-modules (guix build utils))
+
+           (let* ((username (getenv "USER"))
+                  (user (getpwnam username))
+                  (useruid (passwd:uid user))
+                  (usergid (passwd:gid user))
+                  (useruid-s (number->string useruid))
+                  ;; /run/user/<greeter-user-uid> won't exist yet
+                  ;; this will contain WAYLAND_DISPLAY socket file
+                  ;; and log-file below
+                  (user-home-dir "/tmp/.greeter-home")
+                  (user-xdg-runtime-dir (string-append user-home-dir "/run"))
+                  (user-xdg-cache-dir (string-append user-home-dir "/cache"))
+                  (log-file (string-append (number->string (getpid)) ".log"))
+                  (log-file (string-append user-home-dir "/" log-file)))
+             (for-each (lambda (d)
+                         (mkdir-p d)
+                         (chown d useruid usergid) (chmod d #o700))
+                       (list user-home-dir
+                             user-xdg-runtime-dir
+                             user-xdg-cache-dir))
+             (setenv "HOME" user-home-dir)
+             (setenv "XDG_CACHE_DIR" user-xdg-cache-dir)
+             (setenv "XDG_RUNTIME_DIR" user-xdg-runtime-dir)
+             (dup2 (open-fdes log-file
+                              (logior O_CREAT O_WRONLY O_APPEND) #o640) 1)
+             (dup2 1 2)
+             (execl #$sway-bin #$sway-bin "-d" "-c" #$sway-config)))))))
+
+(define-record-type* <greetd-wlgreet-configuration>
+  greetd-wlgreet-configuration make-greetd-wlgreet-configuration
+  greetd-wlgreet-configuration?
+  (output-mode greetd-wlgreet-configuration-output-mode (default "all"))
+  (scale greetd-wlgreet-configuration-scale (default 1))
+  (background greetd-wlgreet-configuration-background (default '(0 0 0 0.9)))
+  (headline greetd-wlgreet-configuration-headline (default '(1 1 1 1)))
+  (prompt greetd-wlgreet-configuration-prompt (default '(1 1 1 1)))
+  (prompt-error greetd-wlgreet-configuration-prompt-error (default '(1 1 1 1)))
+  (border greetd-wlgreet-configuration-border (default '(1 1 1 1)))
+  (wlgreet greetd-wlgreet
+           (default #nil)
+           (sanitize warn-deprecated-greetd-wlgreet))
   (command greetd-wlgreet-command
-           (default (file-append sway "/bin/sway")))
-  (command-args greetd-wlgreet-command-args (default '()))
-  (output-mode greetd-wlgreet-output-mode (default "all"))
-  (scale greetd-wlgreet-scale (default 1))
-  (background greetd-wlgreet-background (default '(0 0 0 0.9)))
-  (headline greetd-wlgreet-headline (default '(1 1 1 1)))
-  (prompt greetd-wlgreet-prompt (default '(1 1 1 1)))
-  (prompt-error greetd-wlgreet-prompt-error (default '(1 1 1 1)))
-  (border greetd-wlgreet-border (default '(1 1 1 1)))
-  (extra-env greetd-wlgreet-extra-env (default '())))
+           (default #nil)
+           (sanitize warn-deprecated-greetd-wlgreet-command))
+  (command-args greetd-wlgreet-command-args
+                (default #nil)
+                (sanitize warn-deprecated-greetd-wlgreet-command-args))
+  (extra-env greetd-wlgreet-extra-env
+             (default #nil)
+             (sanitize warn-deprecated-greetd-wlgreet-extra-env)))
 
-(define (greetd-wlgreet-wayland-session-command session)
-  (program-file "wlgreet-session-command"
-    #~(let* ((username (getenv "USER"))
-             (useruid (number->string
-                       (passwd:uid (getpwuid username))))
-             (command #$(greetd-wlgreet-command session)))
-        (use-modules (ice-9 match))
-        (setenv "XDG_SESSION_TYPE" "wayland")
-        (setenv "XDG_RUNTIME_DIR" (string-append "/run/user/" useruid))
-        (for-each (lambda (env) (setenv (car env) (cdr env)))
-                  '(#$@(greetd-wlgreet-extra-env session)))
-        (apply execl command command
-               (list #$@(greetd-wlgreet-command-args session))))))
+(define-deprecated/alias greetd-wlgreet-session greetd-wlgreet-configuration)
 
-(define (make-wlgreet-config-color section-name color)
+(define (warn-deprecated-greetd-wlgreet value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'wlgreet #f
+     #:replacement '<greetd-wlgreet-sway-session>))
+  value)
+
+(define (warn-deprecated-greetd-wlgreet-command value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'command #f
+     #:replacement '<greetd-wlgreet-sway-session>))
+  value)
+
+(define (warn-deprecated-greetd-wlgreet-command-args value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'command-args #f
+     #:replacement '<greetd-wlgreet-sway-session>))
+  value)
+
+(define (warn-deprecated-greetd-wlgreet-extra-env value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'extra-env #f
+     #:replacement '<greetd-wlgreet-sway-session>))
+  value)
+
+(define (make-greetd-wlgreet-config-color section-name color)
   (match color
     ((red green blue opacity)
      (string-append
@@ -3483,76 +3618,103 @@ to handle."
       "blue = " (number->string blue) "\n"
       "opacity = " (number->string opacity) "\n"))))
 
-(define (make-wlgreet-configuration-file session)
-  (let ((command (greetd-wlgreet-wayland-session-command session))
-        (output-mode (greetd-wlgreet-output-mode session))
-        (scale (greetd-wlgreet-scale session))
-        (background (greetd-wlgreet-background session))
-        (headline (greetd-wlgreet-headline session))
-        (prompt (greetd-wlgreet-prompt session))
-        (prompt-error (greetd-wlgreet-prompt-error session))
-        (border (greetd-wlgreet-border session)))
-    (mixed-text-file "wlgreet.toml"
-      "command = \"" command "\"\n"
-      "outputMode = \"" output-mode "\"\n"
-      "scale = " (number->string scale) "\n"
-      (apply string-append
-             (map (match-lambda
-                    ((section-name . color)
-                     (make-wlgreet-config-color section-name color)))
-                  `(("background" . ,background)
-                    ("headline" . ,headline)
-                    ("prompt" . ,prompt)
-                    ("prompt-error" . ,prompt-error)
-                    ("border" . ,border)))))))
+(define (make-greetd-wlgreet-config command color)
+  (match-record color <greetd-wlgreet-configuration>
+    (output-mode scale background headline prompt prompt-error border)
+    (mixed-text-file
+     "wlgreet.toml"
+     "command = \"" command "\"\n"
+     "outputMode = \"" output-mode "\"\n"
+     "scale = " (number->string scale) "\n"
+     (apply string-append
+            (map (match-lambda
+                   ((section-name . color)
+                    (make-greetd-wlgreet-config-color section-name color)))
+                 `(("background" . ,background)
+                   ("headline" . ,headline)
+                   ("prompt" . ,prompt)
+                   ("prompt-error" . ,prompt-error)
+                   ("border" . ,border)))))))
 
 (define-record-type* <greetd-wlgreet-sway-session>
   greetd-wlgreet-sway-session make-greetd-wlgreet-sway-session
   greetd-wlgreet-sway-session?
-  (wlgreet-session greetd-wlgreet-sway-session-wlgreet-session       ;<greetd-wlgreet-session>
-                   (default (greetd-wlgreet-session)))
-  (sway greetd-wlgreet-sway-session-sway (default sway))             ;<package>
-  (sway-configuration greetd-wlgreet-sway-session-sway-configuration ;file-like
-                      (default (plain-file "wlgreet-sway-config" ""))))
+  (sway greetd-wlgreet-sway-session-sway (default sway))
+  (sway-configuration greetd-wlgreet-sway-session-sway-configuration
+                      (default #f))
+  (wlgreet greetd-wlgreet-sway-session-wlgreet (default wlgreet))
+  (wlgreet-configuration greetd-wlgreet-sway-session-wlgreet-configuration
+                         (default (greetd-wlgreet-configuration)))
+  (command greetd-wlgreet-sway-session-command (default (greetd-user-session)))
+  (wlgreet-session
+   greetd-wlgreet-sway-session-wlgreet-session
+   (default #nil)
+   (sanitize warn-deprecated-greetd-wlgreet-sway-session-wlgreet-session)))
 
-(define (make-wlgreet-sway-configuration-file session)
-  (let* ((wlgreet-session (greetd-wlgreet-sway-session-wlgreet-session session))
-         (wlgreet-config (make-wlgreet-configuration-file wlgreet-session))
-         (wlgreet (file-append (greetd-wlgreet wlgreet-session) "/bin/wlgreet"))
-         (sway-config (greetd-wlgreet-sway-session-sway-configuration session))
-         (swaymsg (file-append (greetd-wlgreet-sway-session-sway session)
-                               "/bin/swaymsg")))
-    (mixed-text-file "wlgreet-sway.conf"
-      "include " sway-config "\n"
-      "xwayland disable\n"
-      "exec \"" wlgreet " --config " wlgreet-config "; "
-      swaymsg " exit\"\n")))
+(define (warn-deprecated-greetd-wlgreet-sway-session-wlgreet-session value)
+  (unless (nil? value)
+    (warn-about-deprecation
+     'wlgreet-session #f
+     #:replacement 'wlgreet-configuration))
+  value)
+
+(define (make-greetd-wlgreet-sway-session-sway-config session)
+  (match-record session <greetd-wlgreet-sway-session>
+                (sway sway-configuration wlgreet wlgreet-configuration command)
+    (let ((wlgreet-bin (file-append wlgreet "/bin/wlgreet"))
+          (wlgreet-config-file
+           (make-greetd-wlgreet-config command wlgreet-configuration))
+          (swaymsg-bin (file-append sway "/bin/swaymsg")))
+      (mixed-text-file
+       "wlgreet-sway-config"
+       (if sway-configuration
+           #~(string-append "include " #$sway-configuration "\n")
+           "")
+       "xwayland disable\n"
+       "exec \"" wlgreet-bin " --config " wlgreet-config-file
+       "; " swaymsg-bin " exit\"\n"))))
+
+(define (greetd-wlgreet-session-to-config session config)
+  (let* ((wlgreet (or (greetd-wlgreet config)
+                      (greetd-wlgreet-sway-session-wlgreet session)))
+         (default-command (greetd-wlgreet-sway-session-command session))
+         (command (or (greetd-wlgreet-command config)
+                      (greetd-user-session-command default-command)))
+         (command-args (or (greetd-wlgreet-command-args config)
+                           (greetd-user-session-command-args default-command)))
+         (extra-env (or (greetd-wlgreet-extra-env config)
+                        (greetd-user-session-extra-env default-command))))
+    (greetd-wlgreet-sway-session
+     (sway (greetd-wlgreet-sway-session-sway session))
+     (sway-configuration
+      (greetd-wlgreet-sway-session-sway-configuration session))
+     (wlgreet wlgreet)
+     (wlgreet-configuration config)
+     (command
+      (greetd-user-session
+       (command command)
+       (command-args command-args)
+       (extra-env extra-env))))))
 
 (define-gexp-compiler (greetd-wlgreet-sway-session-compiler
                        (session <greetd-wlgreet-sway-session>)
                        system target)
-  (let ((sway (file-append (greetd-wlgreet-sway-session-sway session)
-                           "/bin/sway"))
-        (config (make-wlgreet-sway-configuration-file session)))
-    (lower-object
-     (program-file "wlgreet-sway-session-command"
-       #~(let* ((log-file (open-output-file
-                           (string-append "/tmp/sway-greeter."
-                                          (number->string (getpid))
-                                          ".log")))
-                (username (getenv "USER"))
-                (useruid (number->string (passwd:uid (getpwuid username)))))
-           ;; redirect stdout/err to log-file
-           (dup2 (fileno log-file) 1)
-           (dup2 1 2)
-           (sleep 1) ;give seatd/logind some time to start up
-           (setenv "XDG_RUNTIME_DIR" (string-append "/run/user/" useruid))
-           (execl #$sway #$sway "-d" "-c" #$config))))))
+  (let ((s (if (nil? (greetd-wlgreet-sway-session-wlgreet-session session))
+               session
+               (greetd-wlgreet-session-to-config
+                session
+                (greetd-wlgreet-sway-session-wlgreet-session session)))))
+    (match-record s <greetd-wlgreet-sway-session> (sway)
+      (lower-object
+       (make-greetd-sway-greeter-command
+        sway
+        (make-greetd-wlgreet-sway-session-sway-config s))))))
 
 (define-record-type* <greetd-terminal-configuration>
   greetd-terminal-configuration make-greetd-terminal-configuration
   greetd-terminal-configuration?
   (greetd greetd-package (default greetd))
+  (shepherd-requirement greetd-shepherd-requirement (default '()))
   (config-file-name greetd-config-file-name (thunked)
                     (default (default-config-file-name this-record)))
   (log-file-name greetd-log-file-name (thunked)
@@ -3625,7 +3787,8 @@ to handle."
          (name "greeter")
          (group "greeter")
          (supplementary-groups (greetd-greeter-supplementary-groups config))
-         (system? #t))))
+         (system? #t)
+         (create-home-directory? #f))))
 
 (define (make-greetd-pam-mount-conf-file config)
   (computed-file
@@ -3675,6 +3838,11 @@ to handle."
                              (list optional-pam-mount))))
            pam))))))
 
+(define (greetd-run-user-activation config)
+  #~(let ((d "/run/user"))
+      (mkdir d #o755)
+      (chmod d #o755)))
+
 (define (greetd-shepherd-services config)
   (map
    (lambda (tc)
@@ -3682,10 +3850,12 @@ to handle."
          ((greetd-bin (file-append (greetd-package tc) "/sbin/greetd"))
           (greetd-conf (make-greetd-terminal-configuration-file tc))
           (greetd-log (greetd-log-file-name tc))
-          (greetd-vt (greetd-terminal-vt tc)))
+          (greetd-vt (greetd-terminal-vt tc))
+          (greetd-requirement (greetd-shepherd-requirement tc)))
        (shepherd-service
         (documentation "Minimal and flexible login manager daemon")
-        (requirement '(pam user-processes host-name udev virtual-terminal))
+        (requirement `(pam user-processes host-name udev virtual-terminal
+                           ,@greetd-requirement))
         (provision (list (symbol-append
                           'term-tty
                           (string->symbol (greetd-terminal-vt tc)))))
@@ -3706,6 +3876,7 @@ login manager daemon.")
     (list
      (service-extension account-service-type greetd-accounts)
      (service-extension file-system-service-type (const %greetd-file-systems))
+     (service-extension activation-service-type greetd-run-user-activation)
      (service-extension etc-service-type greetd-etc-service)
      (service-extension pam-root-service-type greetd-pam-service)
      (service-extension shepherd-root-service-type greetd-shepherd-services)))