From e9e26c8397ae352ba4fb0ff1bf0f563d0aa27503 Mon Sep 17 00:00:00 2001
From: Adam Boardman <adamboardman@gmail.com>
Date: Wed, 6 Jan 2021 20:06:50 +0000
Subject: [PATCH] Add parent process id propergation to find desired
 environment variable

---
 debian/postinst | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/debian/postinst b/debian/postinst
index 78925bd..b8481f2 100755
--- a/debian/postinst
+++ b/debian/postinst
@@ -30,7 +30,12 @@ then
 fi
 
 if [ "$device" == unknown ]; then
-  device=$TARGET_DEVICE
+  pid=$$
+  while [ "$device" == unknown -a $pid != 1 ]; do
+    env=`strings /proc/$pid/environ`
+    device=`echo "$env"|awk -F= '$1 == "TARGET_DEVICE" { print $2; }'`
+    pid=`ps -oppid -p$pid|tail -1|awk '{print $1}'`
+  done
 fi
 
 [ -e /lib/udev/rules.d/80-keyboard.rules ] || \