ant 如何处理不存在的路径元素？

发布于 2024-09-28 02:25:33 字数 235 浏览 1 评论 0原文

如果我使用指向不存在目录的路径元素定义路径，ant 会如何表现？

<path id="foo.bar">
   <pathelement location="this/might/not/exist/">
</path>

场景是 ant 文件用于多个项目 - 有些项目有这个附加文件夹，有些则没有。

ant 会直接忽略它，还是会失败？

原文

How does ant behave if I define a path with a pathelement which points to a non-existent directory?

<path id="foo.bar">
   <pathelement location="this/might/not/exist/">
</path>

The scenario is that the ant file is used for several projects - some have this additional folder, and some do not.

Does ant just ignore it, or does it fail?

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友欢 2024-10-05 02:25:33

这取决于上下文。

当用作 javac 任务的类路径时，丢失的目录将被简单地忽略：

此任务将删除所有指向不存在的条目
文件/目录从传递给编译器的类路径。

但是，如果您使用包含不存在目录的路径（例如作为副本的源），您将收到错误。
例如，这里存在目录“一”和“三”，但不存在“二”：

<path id="mypath">
    <pathelement path="one" />
    <pathelement path="two" />
    <pathelement path="three" />
</path>

<copy todir="dest">
    <path refid="mypath" />
</copy>

BUILD FAILED
/.../build.xml:14: Warning: Could not find resource file ".../two" to copy.

您可以使用 dirset 来过滤掉丢失的项目：

<pathconvert property="dirs.list" pathsep="," refid="mypath">
    <map from="${basedir}/" to="" />
</pathconvert>
<dirset id="exists.dirs" dir="." includes="${dirs.list}" />    
<copy todir="dest">
    <dirset refid="exists.dirs" />
</copy>

 [copy] Copied 2 empty directories to 2 empty directories under /.../dest

It depends on the context.

When used as a classpath for the javac task, the missing directories are simply ignored:

This task will drop all entries that point to non-existent
files/directories from the classpath it passes to the compiler.

But if you use a path containing a non-existent directory, say as the source for a copy, you'll get an error.
For example, here directories 'one' and 'three' exist, but 'two' does not:

<path id="mypath">
    <pathelement path="one" />
    <pathelement path="two" />
    <pathelement path="three" />
</path>

<copy todir="dest">
    <path refid="mypath" />
</copy>

BUILD FAILED
/.../build.xml:14: Warning: Could not find resource file ".../two" to copy.

You could use a dirset to filter out the missing items perhaps:

<pathconvert property="dirs.list" pathsep="," refid="mypath">
    <map from="${basedir}/" to="" />
</pathconvert>
<dirset id="exists.dirs" dir="." includes="${dirs.list}" />    
<copy todir="dest">
    <dirset refid="exists.dirs" />
</copy>

 [copy] Copied 2 empty directories to 2 empty directories under /.../dest

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