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

8 files changed, 536 insertions, 0 deletions

diff --git a/vendor/github.com/julz/importas/.gitignore b/vendor/github.com/julz/importas/.gitignore
new file mode 100644
index 000000000..c264e642f
--- /dev/null
+++ b/vendor/github.com/julz/importas/.gitignore
@@ -0,0 +1,2 @@
+.idea/
+importas
diff --git a/vendor/github.com/julz/importas/LICENSE b/vendor/github.com/julz/importas/LICENSE
new file mode 100644
index 000000000..261eeb9e9
--- /dev/null
+++ b/vendor/github.com/julz/importas/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
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+      designated in writing by the copyright owner as "Not a Contribution."
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+          notices within Derivative Works that You distribute, alongside
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+      whether in tort (including negligence), contract, or otherwise,
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+      negligent acts) or agreed to in writing, shall any Contributor be
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.
diff --git a/vendor/github.com/julz/importas/README.md b/vendor/github.com/julz/importas/README.md
new file mode 100644
index 000000000..1ea7b4fb2
--- /dev/null
+++ b/vendor/github.com/julz/importas/README.md
@@ -0,0 +1,59 @@
+A linter to enforce importing certain packages consistently.
+
+## What is this for?
+
+Ideally, go imports should avoid aliasing. Sometimes though, especially with
+Kubernetes API code, it becomes unavoidable, because many packages are imported
+as e.g. "[package]/v1alpha1" and you end up with lots of collisions if you use
+"v1alpha1". 
+
+This linter lets you enforce that whenever (for example)
+"pkg/apis/serving/v1alpha1" is aliased, it is aliased as "servingv1alpha1".
+
+## Usage
+
+~~~~
+importas \
+  -alias knative.dev/serving/pkg/apis/autoscaling/v1alpha1:autoscalingv1alpha1 \
+  -alias knative.dev/serving/pkg/apis/serving/v1:servingv1 \
+  ./...
+~~~~
+
+### `-no-unaliased` option
+
+By default, importas allows non-aliased imports, even when the package is specified by `-alias` flag.
+With `-no-unaliased` option, importas does not allow this.
+
+~~~~
+importas -no-unaliased \
+  -alias knative.dev/serving/pkg/apis/autoscaling/v1alpha1:autoscalingv1alpha1 \
+  -alias knative.dev/serving/pkg/apis/serving/v1:servingv1 \
+  ./...
+~~~~
+
+### `-no-extra-aliases` option
+
+By default, importas allows aliases which are not specified by `-alias` flags.
+With `-no-extra-aliases` option, importas does not allow any unspecified aliases.
+
+~~~~
+importas -no-extra-aliases \
+  -alias knative.dev/serving/pkg/apis/autoscaling/v1alpha1:autoscalingv1alpha1 \
+  -alias knative.dev/serving/pkg/apis/serving/v1:servingv1 \
+  ./...
+~~~~
+
+### Use regular expression
+
+You can specify the package path by regular expression, and alias by regular expression replacement syntax like following snippet.
+
+~~~~
+importas -alias 'knative.dev/serving/pkg/apis/(\w+)/(v[\w\d]+):$1$2'
+~~~~
+
+`$1` represents the text of the first submatch. See [detail](https://golang.org/pkg/regexp/#Regexp.Expand).
+
+So it will enforce that
+
+"knative.dev/serving/pkg/apis/autoscaling/v1alpha1" is aliased by "autoscalingv1alpha1", and
+"knative.dev/serving/pkg/apis/serving/v1" is aliased by "servingv1"
diff --git a/vendor/github.com/julz/importas/analyzer.go b/vendor/github.com/julz/importas/analyzer.go
new file mode 100644
index 000000000..f19653478
--- /dev/null
+++ b/vendor/github.com/julz/importas/analyzer.go
@@ -0,0 +1,141 @@
+package importas
+
+import (
+	"fmt"
+	"go/ast"
+	"go/types"
+	"strconv"
+	"strings"
+
+	"golang.org/x/tools/go/analysis"
+	"golang.org/x/tools/go/analysis/passes/inspect"
+	"golang.org/x/tools/go/ast/inspector"
+)
+
+var config = &Config{
+	RequiredAlias: make(map[string]string),
+}
+
+var Analyzer = &analysis.Analyzer{
+	Name: "importas",
+	Doc:  "Enforces consistent import aliases",
+	Run:  run,
+
+	Flags: flags(config),
+
+	Requires: []*analysis.Analyzer{inspect.Analyzer},
+}
+
+func run(pass *analysis.Pass) (interface{}, error) {
+	return runWithConfig(config, pass)
+}
+
+func runWithConfig(config *Config, pass *analysis.Pass) (interface{}, error) {
+	if err := config.CompileRegexp(); err != nil {
+		return nil, err
+	}
+
+	inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+	inspect.Preorder([]ast.Node{(*ast.ImportSpec)(nil)}, func(n ast.Node) {
+		visitImportSpecNode(config, n.(*ast.ImportSpec), pass)
+	})
+
+	return nil, nil
+}
+
+func visitImportSpecNode(config *Config, node *ast.ImportSpec, pass *analysis.Pass) {
+	if !config.DisallowUnaliased && node.Name == nil {
+		return
+	}
+
+	alias := ""
+	if node.Name != nil {
+		alias = node.Name.String()
+	}
+
+	if alias == "." {
+		return // Dot aliases are generally used in tests, so ignore.
+	}
+
+	if strings.HasPrefix(alias, "_") {
+		return // Used by go test and for auto-includes, not a conflict.
+	}
+
+	path, err := strconv.Unquote(node.Path.Value)
+	if err != nil {
+		pass.Reportf(node.Pos(), "import not quoted")
+	}
+
+	if required, exists := config.AliasFor(path); exists && required != alias {
+		message := fmt.Sprintf("import %q imported as %q but must be %q according to config", path, alias, required)
+		if alias == "" {
+			message = fmt.Sprintf("import %q imported without alias but must be with alias %q according to config", path, required)
+		}
+
+		pass.Report(analysis.Diagnostic{
+			Pos:     node.Pos(),
+			End:     node.End(),
+			Message: message,
+			SuggestedFixes: []analysis.SuggestedFix{{
+				Message:   "Use correct alias",
+				TextEdits: findEdits(node, pass.TypesInfo.Uses, path, alias, required),
+			}},
+		})
+	} else if !exists && config.DisallowExtraAliases {
+		pass.Report(analysis.Diagnostic{
+			Pos:     node.Pos(),
+			End:     node.End(),
+			Message: fmt.Sprintf("import %q has alias %q which is not part of config", path, alias),
+			SuggestedFixes: []analysis.SuggestedFix{{
+				Message:   "remove alias",
+				TextEdits: findEdits(node, pass.TypesInfo.Uses, path, alias, ""),
+			}},
+		})
+	}
+}
+
+func findEdits(node ast.Node, uses map[*ast.Ident]types.Object, importPath, original, required string) []analysis.TextEdit {
+	// Edit the actual import line.
+	importLine := strconv.Quote(importPath)
+	if required != "" {
+		importLine = required + " " + importLine
+	}
+	result := []analysis.TextEdit{{
+		Pos:     node.Pos(),
+		End:     node.End(),
+		NewText: []byte(importLine),
+	}}
+
+	packageReplacement := required
+	if required == "" {
+		packageParts := strings.Split(importPath, "/")
+		if len(packageParts) != 0 {
+			packageReplacement = packageParts[len(packageParts)-1]
+		} else {
+			// fall back to original
+			packageReplacement = original
+		}
+	}
+
+	// Edit all the uses of the alias in the code.
+	for use, pkg := range uses {
+		pkgName, ok := pkg.(*types.PkgName)
+		if !ok {
+			// skip identifiers that aren't pointing at a PkgName.
+			continue
+		}
+
+		if pkgName.Pos() != node.Pos() {
+			// skip identifiers pointing to a different import statement.
+			continue
+		}
+
+		result = append(result, analysis.TextEdit{
+			Pos:     use.Pos(),
+			End:     use.End(),
+			NewText: []byte(packageReplacement),
+		})
+	}
+
+	return result
+}
diff --git a/vendor/github.com/julz/importas/config.go b/vendor/github.com/julz/importas/config.go
new file mode 100644
index 000000000..8c9c76d91
--- /dev/null
+++ b/vendor/github.com/julz/importas/config.go
@@ -0,0 +1,70 @@
+package importas
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+)
+
+type Config struct {
+	RequiredAlias        map[string]string
+	Rules                []*Rule
+	DisallowUnaliased    bool
+	DisallowExtraAliases bool
+}
+
+func (c *Config) CompileRegexp() error {
+	rules := make([]*Rule, 0, len(c.RequiredAlias))
+	for path, alias := range c.RequiredAlias {
+		reg, err := regexp.Compile(fmt.Sprintf("^%s$", path))
+		if err != nil {
+			return err
+		}
+
+		rules = append(rules, &Rule{
+			Regexp: reg,
+			Alias:  alias,
+		})
+	}
+
+	c.Rules = rules
+	return nil
+}
+
+func (c *Config) findRule(path string) *Rule {
+	for _, rule := range c.Rules {
+		if rule.Regexp.MatchString(path) {
+			return rule
+		}
+	}
+
+	return nil
+}
+
+func (c *Config) AliasFor(path string) (string, bool) {
+	rule := c.findRule(path)
+	if rule == nil {
+		return "", false
+	}
+
+	alias, err := rule.aliasFor(path)
+	if err != nil {
+		return "", false
+	}
+
+	return alias, true
+}
+
+type Rule struct {
+	Alias  string
+	Regexp *regexp.Regexp
+}
+
+func (r *Rule) aliasFor(path string) (string, error) {
+	str := r.Regexp.FindString(path)
+	if len(str) > 0 {
+		return r.Regexp.ReplaceAllString(str, r.Alias), nil
+	}
+
+	return "", errors.New("mismatch rule")
+}
diff --git a/vendor/github.com/julz/importas/flags.go b/vendor/github.com/julz/importas/flags.go
new file mode 100644
index 000000000..f8107104a
--- /dev/null
+++ b/vendor/github.com/julz/importas/flags.go
@@ -0,0 +1,32 @@
+package importas
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"strings"
+)
+
+func flags(config *Config) flag.FlagSet {
+	fs := flag.FlagSet{}
+	fs.Var(stringMap(config.RequiredAlias), "alias", "required import alias in form path:alias")
+	fs.BoolVar(&config.DisallowUnaliased, "no-unaliased", false, "do not allow unaliased imports of aliased packages")
+	fs.BoolVar(&config.DisallowExtraAliases, "no-extra-aliases", false, "do not allow non-required aliases")
+	return fs
+}
+
+type stringMap map[string]string
+
+func (v stringMap) Set(val string) error {
+	spl := strings.SplitN(val, ":", 2)
+	if len(spl) != 2 {
+		return errors.New("import flag must be of form path:alias")
+	}
+
+	v[spl[0]] = spl[1]
+	return nil
+}
+
+func (v stringMap) String() string {
+	return fmt.Sprintf("%v", (map[string]string)(v))
+}
diff --git a/vendor/github.com/julz/importas/go.mod b/vendor/github.com/julz/importas/go.mod
new file mode 100644
index 000000000..97d8c438b
--- /dev/null
+++ b/vendor/github.com/julz/importas/go.mod
@@ -0,0 +1,5 @@
+module github.com/julz/importas
+
+go 1.15
+
+require golang.org/x/tools v0.1.0
diff --git a/vendor/github.com/julz/importas/go.sum b/vendor/github.com/julz/importas/go.sum
new file mode 100644
index 000000000..21d696a65
--- /dev/null
+++ b/vendor/github.com/julz/importas/go.sum
@@ -0,0 +1,26 @@
+github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
+golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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