From d06faa2fcbffd2dcea11e567b7e999e16ee08aed Mon Sep 17 00:00:00 2001
From: Harald <harald.berghoff@gmx.net>
Date: Tue, 9 Apr 2024 02:45:43 +0200
Subject: [PATCH] Fix: add timezone fallback to install script (#6336)

---
 install-paperless-ngx.sh | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/install-paperless-ngx.sh b/install-paperless-ngx.sh
index 84e55d3ee..a6327e3e8 100755
--- a/install-paperless-ngx.sh
+++ b/install-paperless-ngx.sh
@@ -71,7 +71,17 @@ if ! docker stats --no-stream &> /dev/null ; then
 	sleep 3
 fi
 
-default_time_zone=$(timedatectl show -p Timezone --value)
+# Added handling for timezone for busybox based linux, not having timedatectl available (i.e. QNAP QTS)
+# if neither timedatectl nor /etc/TZ is succeeding, defaulting to GMT.
+if  command -v timedatectl &> /dev/null ; then
+	default_time_zone=$(timedatectl show -p Timezone --value)
+elif [ -f /etc/TZ ] && [ -f /etc/tzlist ] ; then
+	TZ=$(cat /etc/TZ)
+	default_time_zone=$(grep -B 1 -m 1 "$TZ" /etc/tzlist | head -1 | cut -f 2 -d =)
+else
+	echo "WARN: unable to detect timezone, defaulting to Etc/UTC"
+	default_time_zone="Etc/UTC"
+fi
 
 set -e