问题 - 创建gradle无法正常工作的目录

我有以下内容build.gradle:

task wrapper(type: Wrapper) {
    gradleVersion = '2.0'
}

apply plugin: 'java'

task filter(type: Copy) {
    def subdir = new File(project.buildDir, "subdir")
    println("subdir: "+subdir)

    if( !subdir.exists() ) {
        println("creating subdir")

        if(subdir.mkdirs()) {
            println("succeeded in making folder")

            if(subdir.exists()) {
                println("folder exists")
            } else {
                println("folder does not exist")
            }
        } else {
            println("failed to make folder")
        }
    } else {
        println("folder exists already")
    }
}

使用gradle wrapperI 下载包装器后,运行:

/tmp/test $ ./gradlew clean filter
subdir: /tmp/test/build/subdir
creating subdir
succeeded in making folder
folder exists
:clean
:filter UP-TO-DATE

BUILD SUCCESSFUL

Total time: 4.121 secs

这似乎表明一切顺利.但是,当我仔细检查时,我得到了这个:

/tmp/test $ ls -l /tmp/test/build/subdir
ls: /tmp/test/build/subdir: No such file or directory

备注:

这是在MacOS Mavericks上.

执行用户可以在shell上创建目录.

有足够的磁盘空间.

请告诉Gradle我在这里做错了什么,无法创建目录,但Gradle表示它成功了？任何疑难解答提示将不胜感激.

谢谢!