43 lines
692 B
Bash
Executable file
43 lines
692 B
Bash
Executable file
#!/usr/bin/env bash
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set -eu
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script_name=$0
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die() {
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echo >&2 "$@"
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exit 1
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}
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about() {
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die "usage: ${script_name} [-q] <port_number>"
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}
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[[ $# -lt 1 ]] && about
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QUIET=
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if [[ "$1" == "-q" ]]; then
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QUIET=quiet
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shift
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fi
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[[ $# -lt 1 ]] && about
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port_number=$1
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# 4 seconds may seem long, but the tests must work on embedded, slow arm boxes too
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for _ in $(seq 40); do
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nc -z localhost "${port_number}" >/dev/null 2>&1 && exit 0
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sleep .1
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done
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# send to &3 if open
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if { true >&3; } 2>/dev/null; then
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[[ -z "${QUIET}" ]] && echo "Can't connect to port ${port_number}" >&3
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else
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[[ -z "${QUIET}" ]] && echo "Can't connect to port ${port_number}" >&2
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fi
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exit 1
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