From 6bbbd9ad5669978a3d41313f4dd32367d4700f7c Mon Sep 17 00:00:00 2001
From: redxef <federanko.manuel@gmail.com>
Date: Tue, 14 May 2024 20:59:04 +0200
Subject: [PATCH] Don't break if no vfio-devices are passed through.

---
 qemu-vm | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/qemu-vm b/qemu-vm
index 8a7b1b3..f93549e 100755
--- a/qemu-vm
+++ b/qemu-vm
@@ -37,16 +37,24 @@ NET_CONF_FILE="$NET_CONF_FILE" "$SUDO" --preserve-env=PATH,NET_CONF_FILE qemu-vm
 # rebind devices
 old_IFS="$IFS"
 IFS=$'\n'
-for device_override in $(< "$CONFIG_PATH/vfio-devices.txt") $(< "$CONFIG_PATH/vfio-devices-$VMNAME.txt"); do
-    device="$(echo "$device_override" | awk '{print $1}')"
-    override="$(echo "$device_override" | awk '{print $2}')"
+for device_override in $(cat "$CONFIG_PATH/vfio-devices.txt" || true) $(cat "$CONFIG_PATH/vfio-devices-$VMNAME.txt" || true); do
+    device_override="${device_override%%#*}"
+    device="$(awk '{print $1}' <<< "$device_override")"
+    override="$(awk '{print $2}' <<< "$device_override")"
+    if [[ "$device" = '' ]] || [[ "$override" = '' ]]; then
+        continue
+    fi
     [[ "$override" != 'true' ]] && continue
     $SUDO --preserve-env=SUDO,PATH qemu-vm-pci vfio_override_device "$device"
 done
 $SUDO modprobe vfio-pci
-for device_override in $(< "$CONFIG_PATH/vfio-devices.txt") $(< "$CONFIG_PATH/vfio-devices-$VMNAME.txt"); do
-    device="$(echo "$device_override" | awk '{print $1}')"
-    override="$(echo "$device_override" | awk '{print $2}')"
+for device_override in $(cat "$CONFIG_PATH/vfio-devices.txt" || true) $(cat "$CONFIG_PATH/vfio-devices-$VMNAME.txt" || true); do
+    device_override="${device_override%%#*}"
+    device="$(awk '{print $1}' <<< "$device_override")"
+    override="$(awk '{print $2}' <<< "$device_override")"
+    if [[ "$device" = '' ]] || [[ "$override" = '' ]]; then
+        continue
+    fi
     $SUDO --preserve-env=SUDO,PATH qemu-vm-pci vfio_rebind_device "$device" "$override"
 done
 IFS="$old_IFS"