From ff77ad620812543c74c839b4126659b4290beb6c Mon Sep 17 00:00:00 2001
From: ThomasToka <117008525+ThomasToka@users.noreply.github.com>
Date: Tue, 4 Jul 2023 12:27:21 +0200
Subject: [PATCH] Update 9990-select-eth-device.sh

Update live-netdev to alternatively use a given mac address for the active network device.

it takes the mac, check which device name this mac has and uses the device name then to fire up the network connection

format is "live-netdev=xx:xx:xx:xx:xx:xx"
---
 components/9990-select-eth-device.sh | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/components/9990-select-eth-device.sh b/components/9990-select-eth-device.sh
index b660a3d..aa7b581 100755
--- a/components/9990-select-eth-device.sh
+++ b/components/9990-select-eth-device.sh
@@ -78,15 +78,32 @@ Select_eth_device ()
 		# If user force to use specific device, write it
 		for ARGUMENT in ${LIVE_BOOT_CMDLINE}
 		do
-			case "${ARGUMENT}" in
-				live-netdev=*)
-				NETDEV="${ARGUMENT#live-netdev=}"
-				echo "DEVICE=$NETDEV" >> /conf/param.conf
-				echo "Found live-netdev parameter, forcing to to use network device $NETDEV."
-				Wait_for_carrier $NETDEV
-				return
-				;;
-			esac
+                        case "${ARGUMENT}" in
+                          live-netdev=*)
+                            NETDEV="${ARGUMENT#live-netdev=}"
+
+                            # Check if NETDEV is a valid MAC address
+                            if echo "$NETDEV" | grep -Eq '^[0-9A-Fa-f]{2}[:-]([0-9A-Fa-f]{2}[:-]){4}[0-9A-Fa-f]{2}$'; then
+                              echo "NETDEV is a valid MAC address."
+
+                              # Retrieve the device name associated with the MAC address
+                              DEVICE_NAME=$(ip -o link | awk -v mac="$NETDEV" '$0 ~ mac{print substr($2, 1, length($2)-1)}')
+                              if [ -n "$DEVICE_NAME" ]; then
+                                echo "Device name for MAC address $NETDEV is $DEVICE_NAME."
+                                NETDEV="$DEVICE_NAME"
+                              fi
+                            else
+                              echo "NETDEV is not a valid MAC address. Assuming it is a device name."
+                              # Assign NETDEV directly to $NETDEV
+                              NETDEV="$NETDEV"
+                            fi
+                            echo "DEVICE=$NETDEV" >> /conf/param.conf
+                            echo "Found live-netdev parameter, forcing it to use network device $NETDEV."
+                            Wait_for_carrier "$NETDEV"
+                            return
+                            ;;
+                        esac
+
 		done
 	else
 		l_interfaces="$DEVICE"
-- 
2.1.4