100 lines
2.0 KiB
Bash
Executable File
100 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env sh
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WAITFOR_TIMEOUT=${WAITFOR_TIMEOUT:-15}
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WAITFOR_QUIET=${WAITFOR_QUIET:-0}
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echoerr() {
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if [ "$WAITFOR_QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi
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}
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usage() {
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exitcode="$1"
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cat <<USAGE >&2
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usage: wait-for host:port [-t timeout] [-- command args]
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Synchronize services like containers and wait for readiness.
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optional arguments:
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-q | --quiet Do not output any status messages
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-t WAITFOR_TIMEOUT | --timeout=timeout Timeout in seconds, zero for no timeout
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-- COMMAND ARGS Execute command with args after the test finishes
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USAGE
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exit "$exitcode"
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}
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wait_for() {
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for _ in $(seq "$WAITFOR_TIMEOUT"); do
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if [ "$HAS_NC" = 1 ]; then
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nc -w 1 -z "$WAITFOR_HOST" "$WAITFOR_PORT" >/dev/null 2>&1
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elif [ "$HAS_BASH" = 1 ]; then
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# shellcheck disable=SC3025
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bash -c "</dev/tcp/$WAITFOR_HOST/$WAITFOR_PORT" >/dev/null 2>&1
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fi
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result=$?
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if [ $result -eq 0 ]; then
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if [ $# -gt 0 ]; then
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exec "$@"
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fi
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exit 0
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fi
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sleep 1
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done
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echo "error: operation timed out" >&2
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exit 1
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}
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while [ $# -gt 0 ]; do
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case "$1" in
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*:*)
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WAITFOR_HOST=$(printf "%s\n" "$1" | cut -d : -f 1)
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WAITFOR_PORT=$(printf "%s\n" "$1" | cut -d : -f 2)
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shift 1
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;;
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-q | --quiet)
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WAITFOR_QUIET=1
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shift 1
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;;
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-t)
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WAITFOR_TIMEOUT="$2"
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if [ "$WAITFOR_TIMEOUT" = "" ]; then break; fi
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shift 2
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;;
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--timeout=*)
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WAITFOR_TIMEOUT="${1#*=}"
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shift 1
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;;
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--)
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shift
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break
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;;
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--help)
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usage 0
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;;
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*)
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echoerr "unknown argument: $1"
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usage 1
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;;
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esac
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done
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if [ -x "$(command -v nc)" ]; then
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HAS_NC=1
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fi
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if [ -x "$(command -v bash)" ]; then
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HAS_BASH=1
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fi
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if [ "$HAS_NC" != 1 ] && [ "$HAS_BASH" != 1 ]; then
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echoerr "error: netcat or bash is required for wait-for to run"
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exit 1
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fi
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if [ "$WAITFOR_HOST" = "" ] || [ "$WAITFOR_PORT" = "" ]; then
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echoerr "error: you need to provide a host and port to test"
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usage 2
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fi
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wait_for "$@"
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