Ant 其中"；“空目录”；你是被蚂蚁复制的吗？

在使用

ant

作为构建工具的项目中，我有以下简化的目录结构：

src/
   com/
      foo/
         bar/
            (some files)
         bar2/
            (some other files)

以及以下简化的ant脚本：

<project default="all">
    <target name="all">
        <delete dir="dst"/>
        <mkdir dir="dst"/>
        <copy todir="dst">
            <fileset dir="src" excludes="com/foo/bar/*"/>
        </copy>
    </target>
</project>

---

问：为什么ant报告正在复制“4个空目录”？那不应该是一个空目录（com/foo/bar）吗？

创建目录

com/foo/bar

意味着首先创建

com

，然后创建

com/foo

——即三个目录

我的Ant版本稍微详细一些，显示了每个创建操作：

$ ant -v
Apache Ant(TM) version 1.10.2 compiled on February 3 2018
... deleted for brevity ....
    [mkdir] Created dir: /stack/ant/dst
     [copy] com/foo/bar2/x.txt added as com/foo/bar2/x.txt doesn't exist.
     [copy]  omitted as /stack/ant/dst is up to date.
1    [copy] com added as com doesn't exist.
2    [copy] com/foo added as com/foo doesn't exist.
3    [copy] com/foo/bar added as com/foo/bar doesn't exist.
4    [copy] com/foo/bar2 added as com/foo/bar2 doesn't exist.
     [copy] Copying 1 file to /stack/ant/dst
     [copy] Copying /stack/ant/src/com/foo/bar2/x.txt to /stack/ant/dst/com/foo/bar2/x.txt
     [copy] Copied 4 empty directories to 1 empty directory under /stack/ant/dst

---

当创建

bar2

时，它（显然）是空的，因此被包括在四个计数中，即使在复制完成时它不是空的。

在

/bar/

下有dir吗？没有，只有文件。有趣的是，如果我在构建脚本中用

或

替换

，未报告“空目录”的复制。。。

$ ant -v
Apache Ant(TM) version 1.10.2 compiled on February 3 2018
... deleted for brevity ....
    [mkdir] Created dir: /stack/ant/dst
     [copy] com/foo/bar2/x.txt added as com/foo/bar2/x.txt doesn't exist.
     [copy]  omitted as /stack/ant/dst is up to date.
1    [copy] com added as com doesn't exist.
2    [copy] com/foo added as com/foo doesn't exist.
3    [copy] com/foo/bar added as com/foo/bar doesn't exist.
4    [copy] com/foo/bar2 added as com/foo/bar2 doesn't exist.
     [copy] Copying 1 file to /stack/ant/dst
     [copy] Copying /stack/ant/src/com/foo/bar2/x.txt to /stack/ant/dst/com/foo/bar2/x.txt
     [copy] Copied 4 empty directories to 1 empty directory under /stack/ant/dst