From 57d5bf15773ae0c23f99395aa35ed9700436fbe3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mattias=20Walstr=C3=B6m?= <lazzer@gmail.com>
Date: Mon, 2 Jun 2025 13:37:20 +0200
Subject: [PATCH] confd: Add script to wait for an interface

usage: wait-interface wlan0 30
---
 src/confd/bin/Makefile.am    |  2 +-
 src/confd/bin/wait-interface | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 src/confd/bin/wait-interface

diff --git a/src/confd/bin/Makefile.am b/src/confd/bin/Makefile.am
index 1748757e..925e5130 100644
--- a/src/confd/bin/Makefile.am
+++ b/src/confd/bin/Makefile.am
@@ -1,4 +1,4 @@
 pkglibexec_SCRIPTS = bootstrap error load gen-service gen-hostname \
 		     gen-interfaces gen-motd gen-hardware gen-version \
-		     mstpd-wait-online
+		     mstpd-wait-online wait-interface
 sbin_SCRIPTS       = dagger migrate
diff --git a/src/confd/bin/wait-interface b/src/confd/bin/wait-interface
new file mode 100644
index 00000000..8900fdbc
--- /dev/null
+++ b/src/confd/bin/wait-interface
@@ -0,0 +1,21 @@
+#!/bin/sh
+if [ $# -lt 2 ]; then
+	echo "usage: $0 <ifname> <timeout>"
+	exit 1
+fi
+
+ifname=$1
+timeout=$2
+while true; do
+    if ip link show $ifname &>/dev/null; then
+        break
+    fi
+
+    retries=$(($retries + 1))
+    if [ $retries -ge $timeout ]; then
+        logger -t wait-interface "Timeout: Interface $ifname not found after $timeout seconds"
+        exit 1
+    fi
+
+    sleep 1
+done