01/02: services: cups: reuse lp from %base-groups.

[guix-commits]

leoprikler pushed a commit to branch master
in repository guix.

commit 476b333fbcda397557382a0988646b8bd177874d
Author: Leo Prikler <leo.prikler@student.tugraz.at>
AuthorDate: Sun Jan 17 20:16:05 2021 +0100

    services: cups: reuse lp from %base-groups.
    
    * gnu/services/cups.scm (%cups-accounts): Try to reuse lp from %base-groups.
---
 gnu/services/cups.scm | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/gnu/services/cups.scm b/gnu/services/cups.scm
index f10615e..17ed04e 100644
--- a/gnu/services/cups.scm
+++ b/gnu/services/cups.scm
@@ -32,7 +32,7 @@
   #:use-module (guix records)
   #:use-module (guix gexp)
   #:use-module (ice-9 match)
-  #:use-module ((srfi srfi-1) #:select (append-map))
+  #:use-module ((srfi srfi-1) #:select (append-map find))
   #:export (cups-service-type
             cups-configuration
             opaque-cups-configuration
@@ -50,7 +50,13 @@
 ;;; Code:
 
 (define %cups-accounts
-  (list (user-group (name "lp") (system? #t))
+  (list (or
+         ;; The "lp" group should already exist; try to reuse it.
+         (find (lambda (group)
+                 (and (user-group? group)
+                      (string=? (user-group-name group) "lp")))
+               %base-groups)
+         (user-group (name "lp") (system? #t)))
         (user-group (name "lpadmin") (system? #t))
         (user-account
          (name "lp")