/lib/ifupdown/wait-for-ll6.sh is in ifupdown 0.8.19.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/sh
attempts=${IF_LL_ATTEMPTS:-60}
delay=${IF_LL_INTERVAL:-0.1}
for attempt in $(seq 1 $attempts); do
lladdress=$(ip -6 -o a s dev "$IFACE" scope link -tentative)
if [ -n "$lladdress" ]; then
attempt=0
break
fi
sleep $delay
done
if [ $attempt -eq $attempts ]; then
echo "Could not get a link-local address"
exit 1
fi
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