From 5264a890afb5c090ec7227934375b7a21dbb5775 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Sat, 8 Apr 2023 01:15:41 +0200
Subject: [PATCH] Serial from environment

---
 serial.sh | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/serial.sh b/serial.sh
index 12ada03..20c5786 100644
--- a/serial.sh
+++ b/serial.sh
@@ -1,24 +1,34 @@
 #!/bin/bash
 
+# Docker environment variabeles
+: ${HOST_SERIAL:=''}
+: ${GUEST_SERIAL:=''}
+
 permanent="DSM"
 serialstart="2000"
 
 IMG="/storage"
 [ ! -d "$IMG" ] && echo "Storage folder (${IMG}) not found!" && exit 69
 
-FILE="${IMG}/host.serial"
-if [ ! -f "$FILE" ]; then
-  SERIAL="$(echo "$serialstart" | tr ' ' '\n' | sort -R | tail -1)$permanent"$(printf "%06d" $((RANDOM % 30000 + 1)))
-  echo $SERIAL > "$FILE"
+#If environment variabele not set fall back to file
+if [ -z "$HOST_SERIAL" ]; then
+  FILE="${IMG}/host.serial"
+  if [ ! -f "$FILE" ]; then
+    SERIAL="$(echo "$serialstart" | tr ' ' '\n' | sort -R | tail -1)$permanent"$(printf "%06d" $((RANDOM % 30000 + 1)))
+    echo $SERIAL > "$FILE"
+  fi
+  HOST_SERIAL=$(cat "${FILE}")
 fi
-HOST_SERIAL=$(cat "${FILE}")
 
-FILE="${IMG}/guest.serial"
-if [ ! -f "$FILE" ]; then
-  SERIAL="$(echo "$serialstart" | tr ' ' '\n' | sort -R | tail -1)$permanent"$(printf "%06d" $((RANDOM % 30000 + 1)))
-  echo $SERIAL > "$FILE"
+#If environment variabele not set fall back to file
+if [ -z "$GUEST_SERIAL" ]; then
+  FILE="${IMG}/guest.serial"
+  if [ ! -f "$FILE" ]; then
+    SERIAL="$(echo "$serialstart" | tr ' ' '\n' | sort -R | tail -1)$permanent"$(printf "%06d" $((RANDOM % 30000 + 1)))
+    echo $SERIAL > "$FILE"
+  fi
+  GUEST_SERIAL=$(cat "${FILE}")
 fi
-GUEST_SERIAL=$(cat "${FILE}")
 
 ./run/serial.bin -cpu=$CPU_CORES \
                 -buildnumber=42962 \