override fun source() = buffer()

  override fun read(
    sink: Buffer,
    byteCount: Long,
  ): Long {
    throw IllegalStateException(
      """
      |Unreadable ResponseBody! These Response objects have bodies that are stripped:
      | * Response.cacheResponse
      | * Response.networkResponse
      | * Response.priorResponse
      | * EventSourceListener

    source1.close() // Not exhausted!
    assertThat(relay1.isClosed).isTrue()
    assertFailsWith<IOException> {
      read(file)
    }.also { expected ->
      assertThat(expected.message).isEqualTo("unreadable cache file")
    }
    assertFile(Relay.PREFIX_DIRTY, -1L, -1, null, null)
  }

  @Test
  fun redundantCallsToCloseAreIgnored() {
    val upstream = Buffer()
    upstream.writeUtf8("abcde")

        expect:
        fails 'syncIt'

        cleanup:
        ins.close()
    }

    @Requires(UnitTestPreconditions.FilePermissions)
    def "sync fails when the output contains unreadable files"() {
        given:
        def input = file("readableFile.txt").createFile()

        def outputDirectory = file("output")
        def unreadableOutput = outputDirectory.file("unreadableFile").createFile()

        when:
        cleanupAction.execute(progressMonitor)

        then:
        0 * progressMonitor._
        distributionWithInvalidVersion.assertExists()
    }

    def "ignores distributions with unreadable JAR files"() {
        given:
        def versionToCleanUp = GradleVersion.version("2.3.4")
        def distributionWithUnreadableJarFile = createCustomDistributionChecksumDir("gradle-1-invalid-all", versionToCleanUp)

	EMULTIHOP       Errno = 72      /* Multihop attempted */
	EDOTDOT         Errno = 73      /* Cross mount point (not really error) */
	EBADMSG         Errno = 74      /* Trying to read unreadable message */
	EOVERFLOW       Errno = 75      /* Value too large for defined data type */
	ENOTUNIQ        Errno = 76      /* Given log. name not unique */
	EBADFD          Errno = 77      /* f.d. invalid for this operation */

type Context interface {
	// AuthenticatedData should return an array of bytes that describes the current value. If the value changes,
	// the transformer may report the value as unreadable or tampered. This may be nil if no such description exists
	// or is needed. For additional verification, set this to data that strongly identifies the value, such as
	// the key and creation version of the stored data.

        }
        return null;
    }

    private Properties read(File touchfile) {
        if (!touchfile.canRead()) {
            getLogger().debug("Skipped unreadable resolution tracking file: " + touchfile);
            return null;
        }

        synchronized (touchfile.getAbsolutePath().intern()) {
            try {
                Properties props = new Properties();

		cmd.Dir = instdira
		run(cmd, t)
	}

	// Do some error testing to ensure that various bad options and
	// combinations are properly rejected.

	// Expect error if config file inaccessible/unreadable.
	mode := "atomic"
	errExpected := true
	tag := "errors"
	_, _, errmsg := runPkgCover(t, instdira, tag, "/not/a/file", mode,
		apkgfiles, errExpected)
	want := "error reading pkgconfig file"

      val header = Buffer()
      fileOperator.read(0, header, FILE_HEADER_SIZE)
      val prefix = header.readByteString(PREFIX_CLEAN.size.toLong())
      if (prefix != PREFIX_CLEAN) throw IOException("unreadable cache file")
      val upstreamSize = header.readLong()
      val metadataSize = header.readLong()

      // Read the metadata.
      val metadataBuffer = Buffer()

==== Declaring input or output directories which contain unreadable content

For up-to-date checks Gradle relies on tracking the state of the inputs and the outputs of a task.
Gradle used to ignore unreadable files in the input or outputs to support certain use-cases, although it cannot track their state.