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