初始化提交

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chenxin committed 2026-08-21 16:00:13 +08:00
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#!/usr/bin/env bash
# 等待 TCP host:port 就绪的工具(wait-for-it 自包含实现)。
# 思路来自 https://github.com/vishnubob/wait-for-it(MIT),精简为项目内置脚本,
# 避免依赖已废弃的 compose/wait-for-it 镜像。
#
# 用法:
# wait-for-it.sh host:port [-t timeout] [-s] [-q] [-- command...]
# -t / --timeout 超时秒数(默认 15)
# -s / --strict 探测失败时不执行后续命令、返回非零
# -q / --quiet 不输出状态
# -- command... 探测成功后执行的命令
set -o pipefail
cmdname=$(basename "$0")
echoerr() { [ "${QUIET:-0}" != 1 ] && echo "$@" 1>&2; }
usage() {
cat <<EOF >&2
Usage: $cmdname host:port [-t timeout] [-s] [-q] [-- command...]
EOF
exit 1
}
HOST=""
PORT=""
TIMEOUT=15
STRICT=0
QUIET=0
CLI=()
while [ $# -gt 0 ]; do
case "$1" in
*:*) HOST=${1%%:*}; PORT=${1##*:}; shift ;;
-h) HOST="$2"; shift 2 ;;
--host=*) HOST="${1#*=}"; shift ;;
-p) PORT="$2"; shift 2 ;;
--port=*) PORT="${1#*=}"; shift ;;
-t) TIMEOUT="$2"; shift 2 ;;
--timeout=*) TIMEOUT="${1#*=}"; shift ;;
-s|--strict) STRICT=1; shift ;;
-q|--quiet) QUIET=1; shift ;;
--) shift; CLI=("$@"); break ;;
*) usage ;;
esac
done
if [ -z "$HOST" ] || [ -z "$PORT" ]; then
usage
fi
# 探测方式:优先 nc,否则用 bash 内建 /dev/tcp(python:3.12-slim 自带 bash)。
USE_NC=0
if command -v nc >/dev/null 2>&1; then
USE_NC=1
fi
probe() {
if [ "$USE_NC" -eq 1 ]; then
nc -z "$HOST" "$PORT"
else
(echo > "/dev/tcp/$HOST/$PORT")
fi
}
echoerr "$cmdname: 等待 $HOST:$PORT(超时 ${TIMEOUT}s)"
start=$(date +%s)
while :; do
if probe >/dev/null 2>&1; then
echoerr "$cmdname: $HOST:$PORT 就绪(耗时 $(($(date +%s) - start))s)"
if [ "${#CLI[@]}" -gt 0 ]; then
exec "${CLI[@]}"
fi
exit 0
fi
if [ "$TIMEOUT" -ge 0 ] && [ "$(date +%s)" -gt $((start + TIMEOUT)) ]; then
break
fi
sleep 1
done
echoerr "$cmdname: $HOST:$PORT 在 ${TIMEOUT}s 内未就绪"
if [ "${#CLI[@]}" -gt 0 ]; then
if [ "$STRICT" -eq 1 ]; then
exit 1
fi
exec "${CLI[@]}"
fi
exit 1