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-rw-r--r--gnu/system.scm3
-rw-r--r--gnu/system/file-systems.scm2
-rw-r--r--gnu/system/shadow.scm42
3 files changed, 27 insertions, 20 deletions
diff --git a/gnu/system.scm b/gnu/system.scm
index 4648d810a3..68f9438693 100644
--- a/gnu/system.scm
+++ b/gnu/system.scm
@@ -363,7 +363,8 @@ alias ll='ls -l'
 'active-groups'."
   #~(list #$(user-group-name group)
           #$(user-group-password group)
-          #$(user-group-id group)))
+          #$(user-group-id group)
+          #$(user-group-system? group)))
 
 (define (user-account->gexp account)
   "Turn ACCOUNT, a <user-account> object, into a list-valued gexp suitable for
diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm
index 3b13d820cf..48c4fc7e77 100644
--- a/gnu/system/file-systems.scm
+++ b/gnu/system/file-systems.scm
@@ -95,7 +95,7 @@
 (define %tty-gid
   ;; ID of the 'tty' group.  Allocate it statically to make it easy to refer
   ;; to it from here and from the 'tty' group definitions.
-  1004)
+  996)
 
 (define %pseudo-terminal-file-system
   ;; The pseudo-terminal file system.  It needs to be mounted so that
diff --git a/gnu/system/shadow.scm b/gnu/system/shadow.scm
index e29dbb8c3e..5d638398d1 100644
--- a/gnu/system/shadow.scm
+++ b/gnu/system/shadow.scm
@@ -43,6 +43,7 @@
             user-group-name
             user-group-password
             user-group-id
+            user-group-system?
 
             default-skeletons
             skeleton-directory
@@ -75,28 +76,33 @@
   user-group?
   (name           user-group-name)
   (password       user-group-password (default #f))
-  (id             user-group-id (default #f)))
+  (id             user-group-id (default #f))
+  (system?        user-group-system?              ; Boolean
+                  (default #f)))
 
 (define %base-groups
   ;; Default set of groups.
-  (list (user-group (name "root") (id 0))
-        (user-group (name "wheel"))               ; root-like users
-        (user-group (name "users"))               ; normal users
-        (user-group (name "nogroup"))             ; for daemons etc.
+  (let-syntax ((system-group (syntax-rules ()
+                               ((_ args ...)
+                                (user-group (system? #t) args ...)))))
+    (list (system-group (name "root") (id 0))
+          (system-group (name "wheel"))              ; root-like users
+          (system-group (name "users"))              ; normal users
+          (system-group (name "nogroup"))            ; for daemons etc.
 
-        ;; The following groups are conventionally used by things like udev to
-        ;; control access to hardware devices.
-        (user-group (name "tty") (id %tty-gid))
-        (user-group (name "dialout"))
-        (user-group (name "kmem"))
-        (user-group (name "video"))
-        (user-group (name "audio"))
-        (user-group (name "netdev"))              ; used in avahi-dbus.conf
-        (user-group (name "lp"))
-        (user-group (name "disk"))
-        (user-group (name "floppy"))
-        (user-group (name "cdrom"))
-        (user-group (name "tape"))))
+          ;; The following groups are conventionally used by things like udev to
+          ;; control access to hardware devices.
+          (system-group (name "tty") (id %tty-gid))
+          (system-group (name "dialout"))
+          (system-group (name "kmem"))
+          (system-group (name "video"))
+          (system-group (name "audio"))
+          (system-group (name "netdev"))             ; used in avahi-dbus.conf
+          (system-group (name "lp"))
+          (system-group (name "disk"))
+          (system-group (name "floppy"))
+          (system-group (name "cdrom"))
+          (system-group (name "tape")))))
 
 (define (default-skeletons)
   "Return the default skeleton files for /etc/skel.  These files are copied by