bugfix

bash/build_class_by_last_tag_version.sh

@@ -7,10 +7,19 @@ if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
   exit 1
 fi
 
-# 重置本地修改、切main分支拉最新代码（过滤正常提示，仅保留错误输出）
+# 重置本地修改
 git restore .
-git checkout main 2>&1 | grep -v "Already on '\|Your branch is up to date'" || { echo "切换main分支失败，终止执行"; exit 1; }
-git pull origin main --rebase 2>&1 | grep -v "Already up to date\|From\|-> FETCH_HEAD" || { echo "拉取main分支最新代码失败，终止执行"; exit 1; }
+
+# 切main分支：屏蔽正常提示，仅失败时退出
+echo "切换到main分支..."
+git checkout main >/dev/null 2>&1 || { echo "切换main分支失败，终止执行"; exit 1; }
+
+# 拉最新代码：兼容"已最新"场景，仅真失败才退出（核心修复）
+echo "拉取main分支最新代码..."
+if ! git pull origin main --rebase >/dev/null 2>&1; then
+  echo "拉取main分支最新代码失败，终止执行"
+  exit 1
+fi
 
 # 优先取HEAD关联tag，无则取仓库最近tag
 get_latest_tag() {