internal fun FileSystem.deleteContents(directory: Path) {
  var exception: IOException? = null
  val files =
    try {
      list(directory)
    } catch (fnfe: FileNotFoundException) {
      return
    }
  for (file in files) {
    try {
      if (metadata(file).isDirectory) {
        deleteContents(file)
      }

      delete(file)

import okhttp3.internal.concurrent.Lockable
import okhttp3.internal.concurrent.Task
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.concurrent.assertLockHeld
import okhttp3.internal.deleteContents
import okhttp3.internal.deleteIfExists
import okhttp3.internal.isCivilized
import okhttp3.internal.okHttpName
import okhttp3.internal.platform.Platform
import okhttp3.internal.platform.Platform.Companion.WARN

  @ArgumentsSource(FileSystemParamProvider::class)
  fun aggressiveClearingHandlesWrite(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    Assumptions.assumeFalse(windows) // Can't deleteContents while the journal is open.

    filesystem.deleteRecursively(cacheDir)
    set("a", "a", "a")
    assertValue("a", "a", "a")
  }