Add reusable obsutil installer and update flow

lib/obsutil.sh

@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+# 下载或更新仓库内的 obsutil 二进制。
+# - 默认安装到仓库根目录下的 ./obsutil
+# - 若系统已有 obsutil，不会覆盖；只管理仓库内副本
+# - install.sh 和手动维护都可复用这个脚本
+
+set -Eeuo pipefail
+
+SCRIPT_PATH="${BASH_SOURCE[0]:-$0}"
+LIB_DIR="$(cd "$(dirname -- "$SCRIPT_PATH")" && pwd -P)"
+ROOT_DIR="$(cd "${LIB_DIR}/.." && pwd -P)"
+TARGET_BIN="${ROOT_DIR}/obsutil"
+DRY_RUN=false
+
+usage() {
+  cat <<'USAGE'
+用法：
+  ./lib/obsutil.sh [--dry-run]
+
+说明：
+  - 下载并安装或更新仓库内的 ./obsutil
+  - 默认覆盖仓库里的旧版本
+  - dry-run 只打印将执行的动作，不实际下载
+USAGE
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --dry-run) DRY_RUN=true; shift ;;
+    -h|--help) usage; exit 0 ;;
+    *) echo "未知参数：$1" >&2; usage; exit 2 ;;
+  esac
+done
+
+need_cmd() {
+  command -v "$1" >/dev/null 2>&1 || {
+    echo "缺少命令：$1" >&2
+    exit 2
+  }
+}
+
+download_file() {
+  local url="$1"
+  local output="$2"
+
+  if command -v curl >/dev/null 2>&1; then
+    curl -fsSL "$url" -o "$output"
+    return 0
+  fi
+
+  if command -v wget >/dev/null 2>&1; then
+    wget -qO "$output" "$url"
+    return 0
+  fi
+
+  echo "缺少下载工具：curl 或 wget" >&2
+  exit 2
+}
+
+resolve_package_name() {
+  case "$(uname -m)" in
+    x86_64|amd64) printf '%s\n' "obsutil_linux_amd64.tar.gz" ;;
+    aarch64|arm64) printf '%s\n' "obsutil_linux_arm64.tar.gz" ;;
+    *)
+      echo "不支持的 CPU 架构：$(uname -m)" >&2
+      echo "请手动安装 obsutil 后再试" >&2
+      exit 2
+      ;;
+  esac
+}
+
+need_cmd install
+need_cmd tar
+
+PACKAGE_NAME="$(resolve_package_name)"
+DOWNLOAD_URL="https://obs-community-intl.obs.ap-southeast-1.myhuaweicloud.com/obsutil/current/${PACKAGE_NAME}"
+
+if $DRY_RUN; then
+  if [[ -x "$TARGET_BIN" ]]; then
+    echo "[dry-run] 将更新仓库内 obsutil：${TARGET_BIN}"
+  else
+    echo "[dry-run] 将安装仓库内 obsutil：${TARGET_BIN}"
+  fi
+  echo "[dry-run] 下载地址：${DOWNLOAD_URL}"
+  exit 0
+fi
+
+TMP_DIR="$(mktemp -d)"
+ARCHIVE_PATH="${TMP_DIR}/${PACKAGE_NAME}"
+trap 'rm -rf "$TMP_DIR"' EXIT
+
+if [[ -x "$TARGET_BIN" ]]; then
+  echo "开始更新仓库内 obsutil：${TARGET_BIN}"
+else
+  echo "开始安装仓库内 obsutil：${TARGET_BIN}"
+fi
+
+download_file "$DOWNLOAD_URL" "$ARCHIVE_PATH"
+tar -xzf "$ARCHIVE_PATH" -C "$TMP_DIR"
+
+BINARY_PATH="$(find "$TMP_DIR" -type f -name obsutil | head -n 1)"
+if [[ -z "$BINARY_PATH" ]]; then
+  echo "下载包中未找到 obsutil 可执行文件" >&2
+  exit 2
+fi
+
+install -m 755 "$BINARY_PATH" "$TARGET_BIN"
+VERSION_OUTPUT="$("$TARGET_BIN" version 2>/dev/null || true)"
+if [[ -z "$VERSION_OUTPUT" ]]; then
+  echo "obsutil 已安装，但运行校验失败：${TARGET_BIN}" >&2
+  exit 2
+fi
+
+echo "obsutil 已就绪：${TARGET_BIN}"
+echo "$VERSION_OUTPUT" | head -n 1