From 797dba244892b3455a9506a44298446844a0f814 Mon Sep 17 00:00:00 2001
From: Frank de Lange <github-f@unternet.org>
Date: Fri, 10 Oct 2025 22:30:38 +0200
Subject: [PATCH] fix #1617 (useradd: user 'audiobookshelf' already exists)

This change fixes the problem of failing upgrades on dpkg-based systems
by reworking the check for whether the `audiobookshelf` user/group already
exists.
---
 build/debian/DEBIAN/preinst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/build/debian/DEBIAN/preinst b/build/debian/DEBIAN/preinst
index e30bc490c..241a47010 100644
--- a/build/debian/DEBIAN/preinst
+++ b/build/debian/DEBIAN/preinst
@@ -22,7 +22,7 @@ add_user() {
   declare -r descr="${4:-No description}"
   declare -r shell="${5:-/bin/false}"
 
-  if ! getent passwd | grep -q "^$user:"; then
+  if ! getent passwd "$user" 2>&1 >/dev/null; then
     echo "Creating system user: $user in $group with $descr and shell $shell"
     useradd $uid_flags --gid $group --no-create-home --system --shell $shell -c "$descr" $user
   fi
@@ -39,7 +39,7 @@ add_group() {
     declare -r gid_flags="--gid $gid"
   fi
 
-  if ! getent group | grep -q "^$group:" ; then
+  if ! getent group "$group" 2>&1 >/dev/null; then
     echo "Creating system group: $group"
     groupadd $gid_flags --system $group
   fi