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#!/bin/sh
# In case we have a slow-to-appear interface (e.g. eth-over-USB),
# and we need to configure it, wait until it appears, but not too
# long either. IF_WAIT_DELAY is in seconds.
if [ "${IF_WAIT_DELAY}" -a ! -e "/sys/class/net/${IFACE}" ]; then
printf "Waiting for interface %s to appear" "${IFACE}"
while [ ${IF_WAIT_DELAY} -gt 0 ]; do
if [ -e "/sys/class/net/${IFACE}" ]; then
printf "\n"
exit 0
fi
sleep 1
printf "."
: $((IF_WAIT_DELAY -= 1))
done
printf " timeout!\n"
exit 1
fi
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