func (sys *NotificationSys) SignalService(sig serviceSignal) []NotificationPeerErr {
	ng := WithNPeers(len(sys.peerClients))
	for idx, client := range sys.peerClients {
		if client == nil {
			continue
		}
		client := client
		ng.Go(GlobalContext, func() error {
			// force == true preserves the current behavior
			return client.SignalService(sig, "", false, nil)
		}, idx, *client.host)
	}

		return false
	}

	d = make([]byte, directory64EndLen)
	if _, err := zip.ReadAt(d, dirOff); err != nil {
		t.Fatalf("ReadAt(off=%d): %v", dirOff, err)
	}

	b := readBuf(d)
	if sig := b.uint32(); sig != directory64EndSignature {
		return false
	}

	size := b.uint64()
	if size != directory64EndLen-12 {
		t.Errorf("expected length of %d, got %d", directory64EndLen-12, size)
	}
	return true
}

//
// CanonicalizedProtocolHeaders = <described below>

// doesSignV2Match - Verify authorization header with calculated header in accordance with
//     - http://docs.aws.amazon.com/AmazonS3/latest/dev/auth-request-sig-v2.html
// returns true if matches, false otherwise. if error is not nil then it is always false

func validateV2AuthHeader(r *http.Request) (auth.Credentials, APIErrorCode) {
	var cred auth.Credentials

*   [Build](https://www.tensorflow.org/install/source) the TensorFlow pip
    package from source.

## Continuous build status

You can find more community-supported platforms and configurations in the
[TensorFlow SIG Build community builds table](https://github.com/tensorflow/build#community-supported-tensorflow-builds).

### Official Builds

	defer xhttp.DrainBody(respBody)
	return nil
}

// SignalService - sends signal to peer nodes.
func (client *peerRESTClient) SignalService(sig serviceSignal, subSys string, dryRun bool, execAt *time.Time) error {
	values := grid.NewMSS()
	values.Set(peerRESTSignal, strconv.Itoa(int(sig)))
	values.Set(peerRESTDryRun, strconv.FormatBool(dryRun))
	values.Set(peerRESTSubSys, subSys)
	if execAt != nil {

	return ErrNone
}

// doesSignatureMatch - Verify authorization header with calculated header in accordance with
//   - http://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
//
// returns ErrNone if signature matches.
func doesSignatureMatch(hashedPayload string, r *http.Request, region string, stype serviceType) APIErrorCode {
	// Copy request.
	req := *r

If these test dependencies need to be in the TensorFlow pip package, please
add them to //tensorflow/tools/pip_package/BUILD. Otherwise, add the no_pip tag
to the test, or change code_check_full.bats in the SIG Build repository. That's
https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/tf_sig_build_dockerfiles/devel.usertools/code_check_full.bats
Here are the affected tests:
EOF
    while read dep; do

// authentication algorithms. Note that this doesn't include certificate types
// since those use the underlying algorithm. This list is sent to the client if
// it supports the server-sig-algs extension. Order is irrelevant.
// https://cs.opensource.google/go/x/crypto/+/refs/tags/v0.22.0:ssh/common.go;l=142
var supportedPubKeyAuthAlgos = []string{
	ssh.KeyAlgoED25519,
	ssh.KeyAlgoSKED25519, ssh.KeyAlgoSKECDSA256,

### Instrumentation

In v1.9 we focused on improving stability of the components owned by the SIG, including Heapster, Custom Metrics API adapters for Prometheus, and Stackdriver.

### Network

    [tensorflow/build Docker images](https://hub.docker.com/r/tensorflow/build)
    (`tensorflow/tensorflow:devel` and `tensorflow/tensorflow:devel-gpu` are no
    longer supported for development). Use TF SIG Build Dockerfiles in
    development to avoid installing the packages directly on your system (in
    which case remember to change the directory from `/root` to `/tensorflow`