Fixes #1075
Rather than trying to pick a utility, we should be able to just use bash to check if a port is available or not. We can probably assume bash is available due to the shebang declaring it.
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@ -70,11 +70,14 @@ while [ "$*" ]; do
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done
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# Sanity checks
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which netstat >/dev/null 2>&1 \
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|| die "Must have netstat installed"
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netstat -ltn | grep -qs ":${PORT} .*LISTEN" \
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&& die "Port ${PORT} in use. Try --listen PORT"
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if bash -c "exec 7<>/dev/tcp/localhost/${PORT}" &> /dev/null; then
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exec 7<&-
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exec 7>&-
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die "Port ${PORT} in use. Try --listen PORT"
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else
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exec 7<&-
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exec 7>&-
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fi
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trap "cleanup" TERM QUIT INT EXIT
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