go.mod, vendor: update (#3358)

* go.mod, vendor: remove unnecessary dependencies

Commands:
1. go mod tidy
2. go mod vendor

* go.mod, vendor: update cloud.google.com/go

Commands:
1. go get -u cloud.google.com/go
2. go mod tidy
3. go mod vendor

* go.mod, vendor: update cloud.google.com/*

Commands:
1. go get -u cloud.google.com/storage cloud.google.com/logging
2. go mod tidy
3. go mod vendor

* go.mod, .golangci.yml, vendor: update *lint*

Commands:
1. go get -u golang.org/x/tools github.com/golangci/golangci-lint@v1.47.0
2. go mod tidy
3. go mod vendor
4. edit .golangci.yml to suppress new errors (resolved in the same PR later)

* all: fix lint errors

hash.go: copy() recommended by gosimple
parse.go: ent is never nil
verifier.go: signal.Notify() with unbuffered channel is bad. Have no idea why.

* .golangci.yml: adjust godot rules

check-all is deprecated, but still work
if you're hesitating too - I'll remove this commit

4 files changed, 379 insertions, 14 deletions

diff --git a/vendor/cloud.google.com/go/compute/LICENSE b/vendor/cloud.google.com/go/compute/LICENSE
new file mode 100644
index 000000000..d64569567
--- /dev/null
+++ b/vendor/cloud.google.com/go/compute/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
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+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+   Unless required by applicable law or agreed to in writing, software
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diff --git a/vendor/cloud.google.com/go/compute/metadata/metadata.go b/vendor/cloud.google.com/go/compute/metadata/metadata.go
index 545bd9d37..50538b1d3 100644
--- a/vendor/cloud.google.com/go/compute/metadata/metadata.go
+++ b/vendor/cloud.google.com/go/compute/metadata/metadata.go
@@ -16,7 +16,7 @@
 // metadata and API service accounts.
 //
 // This package is a wrapper around the GCE metadata service,
-// as documented at https://developers.google.com/compute/docs/metadata.
+// as documented at https://cloud.google.com/compute/docs/metadata/overview.
 package metadata // import "cloud.google.com/go/compute/metadata"
 
 import (
@@ -61,14 +61,19 @@ var (
 	instID  = &cachedValue{k: "instance/id", trim: true}
 )
 
-var defaultClient = &Client{hc: &http.Client{
-	Transport: &http.Transport{
-		Dial: (&net.Dialer{
-			Timeout:   2 * time.Second,
-			KeepAlive: 30 * time.Second,
-		}).Dial,
-	},
-}}
+var defaultClient = &Client{hc: newDefaultHTTPClient()}
+
+func newDefaultHTTPClient() *http.Client {
+	return &http.Client{
+		Transport: &http.Transport{
+			Dial: (&net.Dialer{
+				Timeout:   2 * time.Second,
+				KeepAlive: 30 * time.Second,
+			}).Dial,
+		},
+		Timeout: 5 * time.Second,
+	}
+}
 
 // NotDefinedError is returned when requested metadata is not defined.
 //
@@ -130,7 +135,7 @@ func testOnGCE() bool {
 	go func() {
 		req, _ := http.NewRequest("GET", "http://"+metadataIP, nil)
 		req.Header.Set("User-Agent", userAgent)
-		res, err := defaultClient.hc.Do(req.WithContext(ctx))
+		res, err := newDefaultHTTPClient().Do(req.WithContext(ctx))
 		if err != nil {
 			resc <- false
 			return
@@ -140,7 +145,8 @@ func testOnGCE() bool {
 	}()
 
 	go func() {
-		addrs, err := net.DefaultResolver.LookupHost(ctx, "metadata.google.internal")
+		resolver := &net.Resolver{}
+		addrs, err := resolver.LookupHost(ctx, "metadata.google.internal")
 		if err != nil || len(addrs) == 0 {
 			resc <- false
 			return
@@ -282,6 +288,7 @@ func NewClient(c *http.Client) *Client {
 // getETag returns a value from the metadata service as well as the associated ETag.
 // This func is otherwise equivalent to Get.
 func (c *Client) getETag(suffix string) (value, etag string, err error) {
+	ctx := context.TODO()
 	// Using a fixed IP makes it very difficult to spoof the metadata service in
 	// a container, which is an important use-case for local testing of cloud
 	// deployments. To enable spoofing of the metadata service, the environment
@@ -304,9 +311,25 @@ func (c *Client) getETag(suffix string) (value, etag string, err error) {
 	}
 	req.Header.Set("Metadata-Flavor", "Google")
 	req.Header.Set("User-Agent", userAgent)
-	res, err := c.hc.Do(req)
-	if err != nil {
-		return "", "", err
+	var res *http.Response
+	var reqErr error
+	retryer := newRetryer()
+	for {
+		res, reqErr = c.hc.Do(req)
+		var code int
+		if res != nil {
+			code = res.StatusCode
+		}
+		if delay, shouldRetry := retryer.Retry(code, reqErr); shouldRetry {
+			if err := sleep(ctx, delay); err != nil {
+				return "", "", err
+			}
+			continue
+		}
+		break
+	}
+	if reqErr != nil {
+		return "", "", reqErr
 	}
 	defer res.Body.Close()
 	if res.StatusCode == http.StatusNotFound {
diff --git a/vendor/cloud.google.com/go/compute/metadata/retry.go b/vendor/cloud.google.com/go/compute/metadata/retry.go
new file mode 100644
index 000000000..0f18f3cda
--- /dev/null
+++ b/vendor/cloud.google.com/go/compute/metadata/retry.go
@@ -0,0 +1,114 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metadata
+
+import (
+	"context"
+	"io"
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+const (
+	maxRetryAttempts = 5
+)
+
+var (
+	syscallRetryable = func(err error) bool { return false }
+)
+
+// defaultBackoff is basically equivalent to gax.Backoff without the need for
+// the dependency.
+type defaultBackoff struct {
+	max time.Duration
+	mul float64
+	cur time.Duration
+}
+
+func (b *defaultBackoff) Pause() time.Duration {
+	d := time.Duration(1 + rand.Int63n(int64(b.cur)))
+	b.cur = time.Duration(float64(b.cur) * b.mul)
+	if b.cur > b.max {
+		b.cur = b.max
+	}
+	return d
+}
+
+// sleep is the equivalent of gax.Sleep without the need for the dependency.
+func sleep(ctx context.Context, d time.Duration) error {
+	t := time.NewTimer(d)
+	select {
+	case <-ctx.Done():
+		t.Stop()
+		return ctx.Err()
+	case <-t.C:
+		return nil
+	}
+}
+
+func newRetryer() *metadataRetryer {
+	return &metadataRetryer{bo: &defaultBackoff{
+		cur: 100 * time.Millisecond,
+		max: 30 * time.Second,
+		mul: 2,
+	}}
+}
+
+type backoff interface {
+	Pause() time.Duration
+}
+
+type metadataRetryer struct {
+	bo       backoff
+	attempts int
+}
+
+func (r *metadataRetryer) Retry(status int, err error) (time.Duration, bool) {
+	if status == http.StatusOK {
+		return 0, false
+	}
+	retryOk := shouldRetry(status, err)
+	if !retryOk {
+		return 0, false
+	}
+	if r.attempts == maxRetryAttempts {
+		return 0, false
+	}
+	r.attempts++
+	return r.bo.Pause(), true
+}
+
+func shouldRetry(status int, err error) bool {
+	if 500 <= status && status <= 599 {
+		return true
+	}
+	if err == io.ErrUnexpectedEOF {
+		return true
+	}
+	// Transient network errors should be retried.
+	if syscallRetryable(err) {
+		return true
+	}
+	if err, ok := err.(interface{ Temporary() bool }); ok {
+		if err.Temporary() {
+			return true
+		}
+	}
+	if err, ok := err.(interface{ Unwrap() error }); ok {
+		return shouldRetry(status, err.Unwrap())
+	}
+	return false
+}
diff --git a/vendor/cloud.google.com/go/compute/metadata/retry_linux.go b/vendor/cloud.google.com/go/compute/metadata/retry_linux.go
new file mode 100644
index 000000000..bb412f891
--- /dev/null
+++ b/vendor/cloud.google.com/go/compute/metadata/retry_linux.go
@@ -0,0 +1,26 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build linux
+// +build linux
+
+package metadata
+
+import "syscall"
+
+func init() {
+	// Initialize syscallRetryable to return true on transient socket-level
+	// errors. These errors are specific to Linux.
+	syscallRetryable = func(err error) bool { return err == syscall.ECONNRESET || err == syscall.ECONNREFUSED }
+}