From c7c7a897d9668a71af38d2a63753bf20e629767f Mon Sep 17 00:00:00 2001
From: Steven Foerster <sfoerster@gmail.com>
Date: Mon, 23 Nov 2020 03:59:34 +0000
Subject: [PATCH] Resolve "Bugfix: handling empty DIFACE"

---
 scripts/env/setup.sh | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/scripts/env/setup.sh b/scripts/env/setup.sh
index b7c9643..ce3e9bc 100755
--- a/scripts/env/setup.sh
+++ b/scripts/env/setup.sh
@@ -22,13 +22,25 @@ fi
 
 echo "MISTBORN_TAG=$MISTBORN_TAG" | sudo tee -a ${VAR_FILE}
 
-#### install and base services
-iface=$(ip -o -4 route show to default | egrep -o 'dev [^ ]*' | awk 'NR==1{print $2}')
-
-# default interface
+# copy current service files to systemd (overwriting as needed)
 sudo cp /opt/mistborn/scripts/services/Mistborn* /etc/systemd/system/
+
+# set script user and owner
 sudo find /etc/systemd/system/ -type f -name 'Mistborn*' | xargs sudo sed -i "s/User=root/User=$USER/"
 #sudo find /etc/systemd/system/ -type f -name 'Mistborn*' | xargs sudo sed -i "s/ root:root / $USER:$USER /"
+
+# reload in case the iface is not immediately set
+sudo systemctl daemon-reload
+
+#### install and base services
+iface=$(ip -o -4 route show to default | egrep -o 'dev [^ ]*' | awk 'NR==1{print $2}' | tr -d '[:space:]')
+## cannot be empty
+while [[ -z "$iface" ]]; do
+    sleep 2
+    iface=$(ip -o -4 route show to default | egrep -o 'dev [^ ]*' | awk 'NR==1{print $2}' | tr -d '[:space:]')
+done
+
+# default interface
 sudo find /etc/systemd/system/ -type f -name 'Mistborn*' | xargs sudo sed -i "s/DIFACE/$iface/"
 
-sudo systemctl daemon-reload
\ No newline at end of file
+sudo systemctl daemon-reload