[openwrt/openwrt] mediatek: mt7622: add netdev rename preinit script

[LEDE Commits]

dangole pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/7e51d6a4c85de575654c49f410ce3e173176d1a9

commit 7e51d6a4c85de575654c49f410ce3e173176d1a9
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Wed Oct 16 00:10:28 2024 +0100

    mediatek: mt7622: add netdev rename preinit script
    
    Add preinit script to rename network interfaces according to the
    label provided in Device Tree.
    
    Fixes: b6d8297510 ("mediatek: mt7622: add Adtran SmartRG SDG-841t6 device")
    Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 .../mt7622/base-files/lib/preinit/04_set_netdev_label     | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/target/linux/mediatek/mt7622/base-files/lib/preinit/04_set_netdev_label b/target/linux/mediatek/mt7622/base-files/lib/preinit/04_set_netdev_label
new file mode 100644
index 0000000000..110e023b96
--- /dev/null
+++ b/target/linux/mediatek/mt7622/base-files/lib/preinit/04_set_netdev_label
@@ -0,0 +1,15 @@
+set_netdev_labels() {
+	local dir
+	local label
+	local netdev
+
+	for dir in /sys/class/net/*; do
+		[ -r "$dir/of_node/label" ] || continue
+		read -r label < "$dir/of_node/label"
+		netdev="${dir##*/}"
+		[ "$netdev" = "$label" ] && continue
+		ip link set "$netdev" name "$label"
+	done
+}
+
+boot_hook_add preinit_main set_netdev_labels