private List<File> listDirs(File distDir) {
        if (!distDir.exists()) {
            return emptyList();
        }
        File[] files = distDir.listFiles();
        if (files == null) {
            return emptyList();
        }

        List<File> dirs = new ArrayList<File>();
        for (File file : files) {
            if (file.isDirectory()) {
                dirs.add(file);

// from the beginning of the file. Thus, the file base offset is the Pos value
// representing the first byte in the file.
//
// To create the Pos value for a specific source offset (measured in bytes),
// first add the respective file to the current file set using [FileSet.AddFile]
// and then call [File.Pos](offset) for that file. Given a Pos value p
// for a specific file set fset, the corresponding [Position] value is

    private
    fun reportUniqueFileSystemEntryInput(file: File, consumer: String?) {
        if (reportedFileSystemEntries.add(file)) {
            reportFileSystemEntryInput(file, consumer)
        }
    }

    private
    fun reportFileInput(file: File, consumer: String?) {
        reportInput(consumer, null) {
            text("file ")
            reference(host.displayNameOf(file))
        }
    }

    private

                def outputFile = file("output.txt")
                outputs.file(outputFile)
                doLast {
                    outputFile.text = "produced"
                }
            }

            task consumer {
                def inputFile = file("output.txt")
                def outputFile = file("consumerOutput.txt")
                inputs.files(inputFile)
                outputs.file(outputFile)

        def install1 = new File(temporaryFolder, "jdks/jdk-1").tap { mkdirs() }
        new File(install1, DefaultJdkCacheDirectory.MARKER_FILE).createNewFile()

        def install2 = new File(temporaryFolder, "jdks/jdk-2").tap { mkdirs() }
        new File(install2, DefaultJdkCacheDirectory.MARKER_FILE).createNewFile()

        new File(temporaryFolder, "jdks/notReady").tap { mkdirs() }

        when:

        handle.waitForFinish()
        then:
        // we should have extracted the file into a different directory for each extracter
        file("build/extract/thread_0/file.txt").assertExists()
        file("build/extract/thread_1/file.txt").assertExists()
        file("build/extract/thread_2/file.txt").assertExists()

        cleanup:
        handle?.abort()
        server.stop()
    }

            }
        """
        file('a.txt').text = 'a1'
        file('a.bin').text = 'a2'
        file('b.txt').text = 'b1'
        file('b.bin').text = 'b2'

        when:
        run("merge")

        then:
        outputContains("result = [a.txt, b.txt, a.bin, b.bin]")
    }

    def "can subtract the elements of another file collection"() {
        given:

    public static FileInputStream openInputStream(File file) {
        try {
            return FileUtils.openInputStream(file);
        } catch (IOException e) {
            throw new RuntimeException("Problems opening file input stream for file: " + file, e);
        }
    }

    /**
     * Ensures that the given file (or directory) is marked as modified. If the file
     * (or directory) does not exist, a new file is created.

                outputFile = project.file("\${buildDir}/output.txt")
            }
        """
        file('foo/Changing.java') << toUnix(TEXT_WITH_LINE_ENDINGS)
        file('foo/Changing.jpg').bytes = BINARY_CONTENT_WITH_LF

        when:
        execute("taskWithInputs")

        then:
        executedAndNotSkipped(":taskWithInputs")

        when:

    }

    def "reports undeclared file system entry check for File.#kind"() {
        Assume.assumeFalse("cannot use the file APIs in restricted DSL", isRestrictedDsl())

        def configurationCache = newConfigurationCacheFixture()

        UndeclaredFileAccess.FileCheck check = fileCheck(testDirectory)
        buildLogicApplication(check)
        def accessedFile = new File(check.filePath)