28 lines
630 B
Bash
28 lines
630 B
Bash
#!/bin/bash
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set -e -u
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wait_tcp_port() {
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local host="${1}" port="${2}"
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# see http://tldp.org/LDP/abs/html/devref1.html for description of this syntax.
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local max_tries="40"
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for n in `seq 1 "${max_tries}"` ; do
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if { exec 6<>/dev/tcp/"${host}"/"${port}" ; } 2>/dev/null ; then
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break
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else
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echo "$(date) - still trying to connect to ${host}:${port}"
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sleep 1
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fi
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if [ "${n}" -eq "${max_tries}" ]; then
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echo "unable to connect"
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exit 1
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fi
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done
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exec 6>&-
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echo "Connected to ${host}:${port}"
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}
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wait_tcp_port "${1}" "${2}"
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shift 2
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exec "$@"
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