#!/bin/bash
# Wait for wg0 interface to be up with an IP before allowing k3s to start.
# Used as ExecStartPre in k3s systemd drop-in.

MAX_WAIT=120
INTERVAL=2
ELAPSED=0

while [ $ELAPSED -lt $MAX_WAIT ]; do
    if ip link show wg0 >/dev/null 2>&1 && ip addr show wg0 | grep -q 'inet '; then
        echo "wg0 is up with IP after ${ELAPSED}s"
        exit 0
    fi
    sleep $INTERVAL
    ELAPSED=$((ELAPSED + INTERVAL))
done

echo "ERROR: wg0 not up after ${MAX_WAIT}s — starting k3s anyway"
exit 0  # don't block k3s forever, let the watchdog handle it