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wait-for
executable file
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wait-for
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#!/bin/sh
TIMEOUT=15
QUIET=0
echoerr() {
if [ "$QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi
}
usage() {
exitcode="$1"
cat <<USAGE >&2
Usage:
command host:port [-t timeout] [-- command args]
-q | --quiet Do not output any status messages
-t TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout
-- COMMAND ARGS Execute command with args after the test finishes
USAGE
exit "$exitcode"
}
wait_for() {
if ! command -v nc >/dev/null; then
echoerr 'nc command is missing!'
exit 1
fi
for i in $(seq $TIMEOUT); do
nc -z "$HOST" "$PORT" >/dev/null 2>&1
result=$?
if [ $result -eq 0 ]; then
if [ $# -gt 0 ]; then
exec "$@"
fi
exit 0
fi
sleep 1
done
echo "Operation timed out" >&2
exit 1
}
while [ $# -gt 0 ]; do
case "$1" in
*:*)
HOST=$(printf "%s\n" "$1" | cut -d : -f 1)
PORT=$(printf "%s\n" "$1" | cut -d : -f 2)
shift 1
;;
-q | --quiet)
QUIET=1
shift 1
;;
-t)
TIMEOUT="$2"
if [ "$TIMEOUT" = "" ]; then break; fi
shift 2
;;
--timeout=*)
TIMEOUT="${1#*=}"
shift 1
;;
--)
shift
break
;;
--help)
usage 0
;;
*)
echoerr "Unknown argument: $1"
usage 1
;;
esac
done
if [ "$HOST" = "" ] || [ "$PORT" = "" ]; then
echoerr "Error: you need to provide a host and port to test."
usage 2
fi
wait_for "$@"