From 5fb7712c7c2692b77c21a6d799db29f6cefb388f Mon Sep 17 00:00:00 2001
From: Janne Grunau <j@jannau.net>
Date: Tue, 19 Aug 2025 22:55:33 +0200
Subject: [PATCH] update-m1n1: Expand $DTBS if it is a directory

Allows limiting the included devices to Apple silicon macs now that the
kernel has device-trees for iphones, ipads and T2 macs as well.
Avoids having each distribution to modify their default update-m1n1
configuration for this.

Signed-off-by: Janne Grunau <j@jannau.net>
---
 update-m1n1 | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/update-m1n1 b/update-m1n1
index ae274eb..dcd79fa 100755
--- a/update-m1n1
+++ b/update-m1n1
@@ -24,6 +24,12 @@ if [ -z "$DTBS" ]; then
     exit 1
 fi
 
+# If ${DTBS} is a directory expand it to include dtbs from all Apple silicon
+# macs.
+if [ -d "$DTBS" ]; then
+    DTBS="${DTBS}/apple/t6*.dtb ${DTBS}/apple/t81*.dtb"
+fi
+
 umount=false
 
 m1n1config=/run/m1n1.conf