A peek behind the curtain — every file the club keeps on the server, from the front-of-house code to the trophy ledger in the database.
#!/bin/sh
# Block ifup until DAD completion
# Copyright (c) 2016-2018 Kaarle Ritvanen
has_flag() {
ip address show dev $IFACE up | grep -q " $1 "
}
counter=100
while [ "$counter" -gt 0 ] &&
has_flag tentative &&
! has_flag dadfailed; do
sleep 0.2
counter=$((counter - 1))
done