update modules kustomize add helm

Signed-off-by: LiHui <andrewli@yunify.com>

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/labels/copied.deepcopy.go

@@ -0,0 +1,43 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/labels/zz_generated.deepcopy.go
+
+// +build !ignore_autogenerated
+
+/*
+Copyright The Kubernetes Authors.
+
+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 labels
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *Requirement) DeepCopyInto(out *Requirement) {
+	*out = *in
+	if in.strValues != nil {
+		in, out := &in.strValues, &out.strValues
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new Requirement.
+func (in *Requirement) DeepCopy() *Requirement {
+	if in == nil {
+		return nil
+	}
+	out := new(Requirement)
+	in.DeepCopyInto(out)
+	return out
+}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/labels/labels.go

@@ -0,0 +1,192 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/labels/labels.go
+
+/*
+Copyright 2014 The Kubernetes Authors.
+
+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 labels
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// Labels allows you to present labels independently from their storage.
+type Labels interface {
+	// Has returns whether the provided label exists.
+	Has(label string) (exists bool)
+
+	// Get returns the value for the provided label.
+	Get(label string) (value string)
+}
+
+// Set is a map of label:value. It implements Labels.
+type Set map[string]string
+
+// String returns all labels listed as a human readable string.
+// Conveniently, exactly the format that ParseSelector takes.
+func (ls Set) String() string {
+	selector := make([]string, 0, len(ls))
+	for key, value := range ls {
+		selector = append(selector, key+"="+value)
+	}
+	// Sort for determinism.
+	sort.StringSlice(selector).Sort()
+	return strings.Join(selector, ",")
+}
+
+// Has returns whether the provided label exists in the map.
+func (ls Set) Has(label string) bool {
+	_, exists := ls[label]
+	return exists
+}
+
+// Get returns the value in the map for the provided label.
+func (ls Set) Get(label string) string {
+	return ls[label]
+}
+
+// AsSelector converts labels into a selectors. It does not
+// perform any validation, which means the server will reject
+// the request if the Set contains invalid values.
+func (ls Set) AsSelector() Selector {
+	return SelectorFromSet(ls)
+}
+
+// AsValidatedSelector converts labels into a selectors.
+// The Set is validated client-side, which allows to catch errors early.
+func (ls Set) AsValidatedSelector() (Selector, error) {
+	return ValidatedSelectorFromSet(ls)
+}
+
+// AsSelectorPreValidated converts labels into a selector, but
+// assumes that labels are already validated and thus doesn't
+// perform any validation.
+// According to our measurements this is significantly faster
+// in codepaths that matter at high scale.
+func (ls Set) AsSelectorPreValidated() Selector {
+	return SelectorFromValidatedSet(ls)
+}
+
+// FormatLabels convert label map into plain string
+func FormatLabels(labelMap map[string]string) string {
+	l := Set(labelMap).String()
+	if l == "" {
+		l = "<none>"
+	}
+	return l
+}
+
+// Conflicts takes 2 maps and returns true if there a key match between
+// the maps but the value doesn't match, and returns false in other cases
+func Conflicts(labels1, labels2 Set) bool {
+	small := labels1
+	big := labels2
+	if len(labels2) < len(labels1) {
+		small = labels2
+		big = labels1
+	}
+
+	for k, v := range small {
+		if val, match := big[k]; match {
+			if val != v {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
+// Merge combines given maps, and does not check for any conflicts
+// between the maps. In case of conflicts, second map (labels2) wins
+func Merge(labels1, labels2 Set) Set {
+	mergedMap := Set{}
+
+	for k, v := range labels1 {
+		mergedMap[k] = v
+	}
+	for k, v := range labels2 {
+		mergedMap[k] = v
+	}
+	return mergedMap
+}
+
+// Equals returns true if the given maps are equal
+func Equals(labels1, labels2 Set) bool {
+	if len(labels1) != len(labels2) {
+		return false
+	}
+
+	for k, v := range labels1 {
+		value, ok := labels2[k]
+		if !ok {
+			return false
+		}
+		if value != v {
+			return false
+		}
+	}
+	return true
+}
+
+// AreLabelsInWhiteList verifies if the provided label list
+// is in the provided whitelist and returns true, otherwise false.
+func AreLabelsInWhiteList(labels, whitelist Set) bool {
+	if len(whitelist) == 0 {
+		return true
+	}
+
+	for k, v := range labels {
+		value, ok := whitelist[k]
+		if !ok {
+			return false
+		}
+		if value != v {
+			return false
+		}
+	}
+	return true
+}
+
+// ConvertSelectorToLabelsMap converts selector string to labels map
+// and validates keys and values
+func ConvertSelectorToLabelsMap(selector string) (Set, error) {
+	labelsMap := Set{}
+
+	if len(selector) == 0 {
+		return labelsMap, nil
+	}
+
+	labels := strings.Split(selector, ",")
+	for _, label := range labels {
+		l := strings.Split(label, "=")
+		if len(l) != 2 {
+			return labelsMap, fmt.Errorf("invalid selector: %s", l)
+		}
+		key := strings.TrimSpace(l[0])
+		if err := validateLabelKey(key); err != nil {
+			return labelsMap, err
+		}
+		value := strings.TrimSpace(l[1])
+		if err := validateLabelValue(key, value); err != nil {
+			return labelsMap, err
+		}
+		labelsMap[key] = value
+	}
+	return labelsMap, nil
+}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/labels/selector.go

@@ -0,0 +1,925 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/labels/selector.go
+
+/*
+Copyright 2014 The Kubernetes Authors.
+
+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 labels
+
+import (
+	"bytes"
+	"fmt"
+	"sort"
+	"strconv"
+	"strings"
+
+	"log"
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/selection"
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/sets"
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/validation"
+)
+
+// Requirements is AND of all requirements.
+type Requirements []Requirement
+
+// Selector represents a label selector.
+type Selector interface {
+	// Matches returns true if this selector matches the given set of labels.
+	Matches(Labels) bool
+
+	// Empty returns true if this selector does not restrict the selection space.
+	Empty() bool
+
+	// String returns a human readable string that represents this selector.
+	String() string
+
+	// Add adds requirements to the Selector
+	Add(r ...Requirement) Selector
+
+	// Requirements converts this interface into Requirements to expose
+	// more detailed selection information.
+	// If there are querying parameters, it will return converted requirements and selectable=true.
+	// If this selector doesn't want to select anything, it will return selectable=false.
+	Requirements() (requirements Requirements, selectable bool)
+
+	// Make a deep copy of the selector.
+	DeepCopySelector() Selector
+
+	// RequiresExactMatch allows a caller to introspect whether a given selector
+	// requires a single specific label to be set, and if so returns the value it
+	// requires.
+	RequiresExactMatch(label string) (value string, found bool)
+}
+
+// Everything returns a selector that matches all labels.
+func Everything() Selector {
+	return internalSelector{}
+}
+
+type nothingSelector struct{}
+
+func (n nothingSelector) Matches(_ Labels) bool              { return false }
+func (n nothingSelector) Empty() bool                        { return false }
+func (n nothingSelector) String() string                     { return "" }
+func (n nothingSelector) Add(_ ...Requirement) Selector      { return n }
+func (n nothingSelector) Requirements() (Requirements, bool) { return nil, false }
+func (n nothingSelector) DeepCopySelector() Selector         { return n }
+func (n nothingSelector) RequiresExactMatch(label string) (value string, found bool) {
+	return "", false
+}
+
+// Nothing returns a selector that matches no labels
+func Nothing() Selector {
+	return nothingSelector{}
+}
+
+// NewSelector returns a nil selector
+func NewSelector() Selector {
+	return internalSelector(nil)
+}
+
+type internalSelector []Requirement
+
+func (s internalSelector) DeepCopy() internalSelector {
+	if s == nil {
+		return nil
+	}
+	result := make([]Requirement, len(s))
+	for i := range s {
+		s[i].DeepCopyInto(&result[i])
+	}
+	return result
+}
+
+func (s internalSelector) DeepCopySelector() Selector {
+	return s.DeepCopy()
+}
+
+// ByKey sorts requirements by key to obtain deterministic parser
+type ByKey []Requirement
+
+func (a ByKey) Len() int { return len(a) }
+
+func (a ByKey) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
+
+func (a ByKey) Less(i, j int) bool { return a[i].key < a[j].key }
+
+// Requirement contains values, a key, and an operator that relates the key and values.
+// The zero value of Requirement is invalid.
+// Requirement implements both set based match and exact match
+// Requirement should be initialized via NewRequirement constructor for creating a valid Requirement.
+type Requirement struct {
+	key      string
+	operator selection.Operator
+	// In huge majority of cases we have at most one value here.
+	// It is generally faster to operate on a single-element slice
+	// than on a single-element map, so we have a slice here.
+	strValues []string
+}
+
+// NewRequirement is the constructor for a Requirement.
+// If any of these rules is violated, an error is returned:
+// (1) The operator can only be In, NotIn, Equals, DoubleEquals, NotEquals, Exists, or DoesNotExist.
+// (2) If the operator is In or NotIn, the values set must be non-empty.
+// (3) If the operator is Equals, DoubleEquals, or NotEquals, the values set must contain one value.
+// (4) If the operator is Exists or DoesNotExist, the value set must be empty.
+// (5) If the operator is Gt or Lt, the values set must contain only one value, which will be interpreted as an integer.
+// (6) The key is invalid due to its length, or sequence
+//     of characters. See validateLabelKey for more details.
+//
+// The empty string is a valid value in the input values set.
+func NewRequirement(key string, op selection.Operator, vals []string) (*Requirement, error) {
+	if err := validateLabelKey(key); err != nil {
+		return nil, err
+	}
+	switch op {
+	case selection.In, selection.NotIn:
+		if len(vals) == 0 {
+			return nil, fmt.Errorf("for 'in', 'notin' operators, values set can't be empty")
+		}
+	case selection.Equals, selection.DoubleEquals, selection.NotEquals:
+		if len(vals) != 1 {
+			return nil, fmt.Errorf("exact-match compatibility requires one single value")
+		}
+	case selection.Exists, selection.DoesNotExist:
+		if len(vals) != 0 {
+			return nil, fmt.Errorf("values set must be empty for exists and does not exist")
+		}
+	case selection.GreaterThan, selection.LessThan:
+		if len(vals) != 1 {
+			return nil, fmt.Errorf("for 'Gt', 'Lt' operators, exactly one value is required")
+		}
+		for i := range vals {
+			if _, err := strconv.ParseInt(vals[i], 10, 64); err != nil {
+				return nil, fmt.Errorf("for 'Gt', 'Lt' operators, the value must be an integer")
+			}
+		}
+	default:
+		return nil, fmt.Errorf("operator '%v' is not recognized", op)
+	}
+
+	for i := range vals {
+		if err := validateLabelValue(key, vals[i]); err != nil {
+			return nil, err
+		}
+	}
+	return &Requirement{key: key, operator: op, strValues: vals}, nil
+}
+
+func (r *Requirement) hasValue(value string) bool {
+	for i := range r.strValues {
+		if r.strValues[i] == value {
+			return true
+		}
+	}
+	return false
+}
+
+// Matches returns true if the Requirement matches the input Labels.
+// There is a match in the following cases:
+// (1) The operator is Exists and Labels has the Requirement's key.
+// (2) The operator is In, Labels has the Requirement's key and Labels'
+//     value for that key is in Requirement's value set.
+// (3) The operator is NotIn, Labels has the Requirement's key and
+//     Labels' value for that key is not in Requirement's value set.
+// (4) The operator is DoesNotExist or NotIn and Labels does not have the
+//     Requirement's key.
+// (5) The operator is GreaterThanOperator or LessThanOperator, and Labels has
+//     the Requirement's key and the corresponding value satisfies mathematical inequality.
+func (r *Requirement) Matches(ls Labels) bool {
+	switch r.operator {
+	case selection.In, selection.Equals, selection.DoubleEquals:
+		if !ls.Has(r.key) {
+			return false
+		}
+		return r.hasValue(ls.Get(r.key))
+	case selection.NotIn, selection.NotEquals:
+		if !ls.Has(r.key) {
+			return true
+		}
+		return !r.hasValue(ls.Get(r.key))
+	case selection.Exists:
+		return ls.Has(r.key)
+	case selection.DoesNotExist:
+		return !ls.Has(r.key)
+	case selection.GreaterThan, selection.LessThan:
+		if !ls.Has(r.key) {
+			return false
+		}
+		lsValue, err := strconv.ParseInt(ls.Get(r.key), 10, 64)
+		if err != nil {
+			log.Printf("ParseInt failed for value %+v in label %+v, %+v", ls.Get(r.key), ls, err)
+			return false
+		}
+
+		// There should be only one strValue in r.strValues, and can be converted to an integer.
+		if len(r.strValues) != 1 {
+			log.Printf("Invalid values count %+v of requirement %#v, for 'Gt', 'Lt' operators, exactly one value is required", len(r.strValues), r)
+			return false
+		}
+
+		var rValue int64
+		for i := range r.strValues {
+			rValue, err = strconv.ParseInt(r.strValues[i], 10, 64)
+			if err != nil {
+				log.Printf("ParseInt failed for value %+v in requirement %#v, for 'Gt', 'Lt' operators, the value must be an integer", r.strValues[i], r)
+				return false
+			}
+		}
+		return (r.operator == selection.GreaterThan && lsValue > rValue) || (r.operator == selection.LessThan && lsValue < rValue)
+	default:
+		return false
+	}
+}
+
+// Key returns requirement key
+func (r *Requirement) Key() string {
+	return r.key
+}
+
+// Operator returns requirement operator
+func (r *Requirement) Operator() selection.Operator {
+	return r.operator
+}
+
+// Values returns requirement values
+func (r *Requirement) Values() sets.String {
+	ret := sets.String{}
+	for i := range r.strValues {
+		ret.Insert(r.strValues[i])
+	}
+	return ret
+}
+
+// Empty returns true if the internalSelector doesn't restrict selection space
+func (lsel internalSelector) Empty() bool {
+	if lsel == nil {
+		return true
+	}
+	return len(lsel) == 0
+}
+
+// String returns a human-readable string that represents this
+// Requirement. If called on an invalid Requirement, an error is
+// returned. See NewRequirement for creating a valid Requirement.
+func (r *Requirement) String() string {
+	var buffer bytes.Buffer
+	if r.operator == selection.DoesNotExist {
+		buffer.WriteString("!")
+	}
+	buffer.WriteString(r.key)
+
+	switch r.operator {
+	case selection.Equals:
+		buffer.WriteString("=")
+	case selection.DoubleEquals:
+		buffer.WriteString("==")
+	case selection.NotEquals:
+		buffer.WriteString("!=")
+	case selection.In:
+		buffer.WriteString(" in ")
+	case selection.NotIn:
+		buffer.WriteString(" notin ")
+	case selection.GreaterThan:
+		buffer.WriteString(">")
+	case selection.LessThan:
+		buffer.WriteString("<")
+	case selection.Exists, selection.DoesNotExist:
+		return buffer.String()
+	}
+
+	switch r.operator {
+	case selection.In, selection.NotIn:
+		buffer.WriteString("(")
+	}
+	if len(r.strValues) == 1 {
+		buffer.WriteString(r.strValues[0])
+	} else { // only > 1 since == 0 prohibited by NewRequirement
+		// normalizes value order on output, without mutating the in-memory selector representation
+		// also avoids normalization when it is not required, and ensures we do not mutate shared data
+		buffer.WriteString(strings.Join(safeSort(r.strValues), ","))
+	}
+
+	switch r.operator {
+	case selection.In, selection.NotIn:
+		buffer.WriteString(")")
+	}
+	return buffer.String()
+}
+
+// safeSort sort input strings without modification
+func safeSort(in []string) []string {
+	if sort.StringsAreSorted(in) {
+		return in
+	}
+	out := make([]string, len(in))
+	copy(out, in)
+	sort.Strings(out)
+	return out
+}
+
+// Add adds requirements to the selector. It copies the current selector returning a new one
+func (lsel internalSelector) Add(reqs ...Requirement) Selector {
+	var sel internalSelector
+	for ix := range lsel {
+		sel = append(sel, lsel[ix])
+	}
+	for _, r := range reqs {
+		sel = append(sel, r)
+	}
+	sort.Sort(ByKey(sel))
+	return sel
+}
+
+// Matches for a internalSelector returns true if all
+// its Requirements match the input Labels. If any
+// Requirement does not match, false is returned.
+func (lsel internalSelector) Matches(l Labels) bool {
+	for ix := range lsel {
+		if matches := lsel[ix].Matches(l); !matches {
+			return false
+		}
+	}
+	return true
+}
+
+func (lsel internalSelector) Requirements() (Requirements, bool) { return Requirements(lsel), true }
+
+// String returns a comma-separated string of all
+// the internalSelector Requirements' human-readable strings.
+func (lsel internalSelector) String() string {
+	var reqs []string
+	for ix := range lsel {
+		reqs = append(reqs, lsel[ix].String())
+	}
+	return strings.Join(reqs, ",")
+}
+
+// RequiresExactMatch introspect whether a given selector requires a single specific field
+// to be set, and if so returns the value it requires.
+func (lsel internalSelector) RequiresExactMatch(label string) (value string, found bool) {
+	for ix := range lsel {
+		if lsel[ix].key == label {
+			switch lsel[ix].operator {
+			case selection.Equals, selection.DoubleEquals, selection.In:
+				if len(lsel[ix].strValues) == 1 {
+					return lsel[ix].strValues[0], true
+				}
+			}
+			return "", false
+		}
+	}
+	return "", false
+}
+
+// Token represents constant definition for lexer token
+type Token int
+
+const (
+	// ErrorToken represents scan error
+	ErrorToken Token = iota
+	// EndOfStringToken represents end of string
+	EndOfStringToken
+	// ClosedParToken represents close parenthesis
+	ClosedParToken
+	// CommaToken represents the comma
+	CommaToken
+	// DoesNotExistToken represents logic not
+	DoesNotExistToken
+	// DoubleEqualsToken represents double equals
+	DoubleEqualsToken
+	// EqualsToken represents equal
+	EqualsToken
+	// GreaterThanToken represents greater than
+	GreaterThanToken
+	// IdentifierToken represents identifier, e.g. keys and values
+	IdentifierToken
+	// InToken represents in
+	InToken
+	// LessThanToken represents less than
+	LessThanToken
+	// NotEqualsToken represents not equal
+	NotEqualsToken
+	// NotInToken represents not in
+	NotInToken
+	// OpenParToken represents open parenthesis
+	OpenParToken
+)
+
+// string2token contains the mapping between lexer Token and token literal
+// (except IdentifierToken, EndOfStringToken and ErrorToken since it makes no sense)
+var string2token = map[string]Token{
+	")":     ClosedParToken,
+	",":     CommaToken,
+	"!":     DoesNotExistToken,
+	"==":    DoubleEqualsToken,
+	"=":     EqualsToken,
+	">":     GreaterThanToken,
+	"in":    InToken,
+	"<":     LessThanToken,
+	"!=":    NotEqualsToken,
+	"notin": NotInToken,
+	"(":     OpenParToken,
+}
+
+// ScannedItem contains the Token and the literal produced by the lexer.
+type ScannedItem struct {
+	tok     Token
+	literal string
+}
+
+// isWhitespace returns true if the rune is a space, tab, or newline.
+func isWhitespace(ch byte) bool {
+	return ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n'
+}
+
+// isSpecialSymbol detect if the character ch can be an operator
+func isSpecialSymbol(ch byte) bool {
+	switch ch {
+	case '=', '!', '(', ')', ',', '>', '<':
+		return true
+	}
+	return false
+}
+
+// Lexer represents the Lexer struct for label selector.
+// It contains necessary informationt to tokenize the input string
+type Lexer struct {
+	// s stores the string to be tokenized
+	s string
+	// pos is the position currently tokenized
+	pos int
+}
+
+// read return the character currently lexed
+// increment the position and check the buffer overflow
+func (l *Lexer) read() (b byte) {
+	b = 0
+	if l.pos < len(l.s) {
+		b = l.s[l.pos]
+		l.pos++
+	}
+	return b
+}
+
+// unread 'undoes' the last read character
+func (l *Lexer) unread() {
+	l.pos--
+}
+
+// scanIDOrKeyword scans string to recognize literal token (for example 'in') or an identifier.
+func (l *Lexer) scanIDOrKeyword() (tok Token, lit string) {
+	var buffer []byte
+IdentifierLoop:
+	for {
+		switch ch := l.read(); {
+		case ch == 0:
+			break IdentifierLoop
+		case isSpecialSymbol(ch) || isWhitespace(ch):
+			l.unread()
+			break IdentifierLoop
+		default:
+			buffer = append(buffer, ch)
+		}
+	}
+	s := string(buffer)
+	if val, ok := string2token[s]; ok { // is a literal token?
+		return val, s
+	}
+	return IdentifierToken, s // otherwise is an identifier
+}
+
+// scanSpecialSymbol scans string starting with special symbol.
+// special symbol identify non literal operators. "!=", "==", "="
+func (l *Lexer) scanSpecialSymbol() (Token, string) {
+	lastScannedItem := ScannedItem{}
+	var buffer []byte
+SpecialSymbolLoop:
+	for {
+		switch ch := l.read(); {
+		case ch == 0:
+			break SpecialSymbolLoop
+		case isSpecialSymbol(ch):
+			buffer = append(buffer, ch)
+			if token, ok := string2token[string(buffer)]; ok {
+				lastScannedItem = ScannedItem{tok: token, literal: string(buffer)}
+			} else if lastScannedItem.tok != 0 {
+				l.unread()
+				break SpecialSymbolLoop
+			}
+		default:
+			l.unread()
+			break SpecialSymbolLoop
+		}
+	}
+	if lastScannedItem.tok == 0 {
+		return ErrorToken, fmt.Sprintf("error expected: keyword found '%s'", buffer)
+	}
+	return lastScannedItem.tok, lastScannedItem.literal
+}
+
+// skipWhiteSpaces consumes all blank characters
+// returning the first non blank character
+func (l *Lexer) skipWhiteSpaces(ch byte) byte {
+	for {
+		if !isWhitespace(ch) {
+			return ch
+		}
+		ch = l.read()
+	}
+}
+
+// Lex returns a pair of Token and the literal
+// literal is meaningfull only for IdentifierToken token
+func (l *Lexer) Lex() (tok Token, lit string) {
+	switch ch := l.skipWhiteSpaces(l.read()); {
+	case ch == 0:
+		return EndOfStringToken, ""
+	case isSpecialSymbol(ch):
+		l.unread()
+		return l.scanSpecialSymbol()
+	default:
+		l.unread()
+		return l.scanIDOrKeyword()
+	}
+}
+
+// Parser data structure contains the label selector parser data structure
+type Parser struct {
+	l            *Lexer
+	scannedItems []ScannedItem
+	position     int
+}
+
+// ParserContext represents context during parsing:
+// some literal for example 'in' and 'notin' can be
+// recognized as operator for example 'x in (a)' but
+// it can be recognized as value for example 'value in (in)'
+type ParserContext int
+
+const (
+	// KeyAndOperator represents key and operator
+	KeyAndOperator ParserContext = iota
+	// Values represents values
+	Values
+)
+
+// lookahead func returns the current token and string. No increment of current position
+func (p *Parser) lookahead(context ParserContext) (Token, string) {
+	tok, lit := p.scannedItems[p.position].tok, p.scannedItems[p.position].literal
+	if context == Values {
+		switch tok {
+		case InToken, NotInToken:
+			tok = IdentifierToken
+		}
+	}
+	return tok, lit
+}
+
+// consume returns current token and string. Increments the position
+func (p *Parser) consume(context ParserContext) (Token, string) {
+	p.position++
+	tok, lit := p.scannedItems[p.position-1].tok, p.scannedItems[p.position-1].literal
+	if context == Values {
+		switch tok {
+		case InToken, NotInToken:
+			tok = IdentifierToken
+		}
+	}
+	return tok, lit
+}
+
+// scan runs through the input string and stores the ScannedItem in an array
+// Parser can now lookahead and consume the tokens
+func (p *Parser) scan() {
+	for {
+		token, literal := p.l.Lex()
+		p.scannedItems = append(p.scannedItems, ScannedItem{token, literal})
+		if token == EndOfStringToken {
+			break
+		}
+	}
+}
+
+// parse runs the left recursive descending algorithm
+// on input string. It returns a list of Requirement objects.
+func (p *Parser) parse() (internalSelector, error) {
+	p.scan() // init scannedItems
+
+	var requirements internalSelector
+	for {
+		tok, lit := p.lookahead(Values)
+		switch tok {
+		case IdentifierToken, DoesNotExistToken:
+			r, err := p.parseRequirement()
+			if err != nil {
+				return nil, fmt.Errorf("unable to parse requirement: %v", err)
+			}
+			requirements = append(requirements, *r)
+			t, l := p.consume(Values)
+			switch t {
+			case EndOfStringToken:
+				return requirements, nil
+			case CommaToken:
+				t2, l2 := p.lookahead(Values)
+				if t2 != IdentifierToken && t2 != DoesNotExistToken {
+					return nil, fmt.Errorf("found '%s', expected: identifier after ','", l2)
+				}
+			default:
+				return nil, fmt.Errorf("found '%s', expected: ',' or 'end of string'", l)
+			}
+		case EndOfStringToken:
+			return requirements, nil
+		default:
+			return nil, fmt.Errorf("found '%s', expected: !, identifier, or 'end of string'", lit)
+		}
+	}
+}
+
+func (p *Parser) parseRequirement() (*Requirement, error) {
+	key, operator, err := p.parseKeyAndInferOperator()
+	if err != nil {
+		return nil, err
+	}
+	if operator == selection.Exists || operator == selection.DoesNotExist { // operator found lookahead set checked
+		return NewRequirement(key, operator, []string{})
+	}
+	operator, err = p.parseOperator()
+	if err != nil {
+		return nil, err
+	}
+	var values sets.String
+	switch operator {
+	case selection.In, selection.NotIn:
+		values, err = p.parseValues()
+	case selection.Equals, selection.DoubleEquals, selection.NotEquals, selection.GreaterThan, selection.LessThan:
+		values, err = p.parseExactValue()
+	}
+	if err != nil {
+		return nil, err
+	}
+	return NewRequirement(key, operator, values.List())
+
+}
+
+// parseKeyAndInferOperator parse literals.
+// in case of no operator '!, in, notin, ==, =, !=' are found
+// the 'exists' operator is inferred
+func (p *Parser) parseKeyAndInferOperator() (string, selection.Operator, error) {
+	var operator selection.Operator
+	tok, literal := p.consume(Values)
+	if tok == DoesNotExistToken {
+		operator = selection.DoesNotExist
+		tok, literal = p.consume(Values)
+	}
+	if tok != IdentifierToken {
+		err := fmt.Errorf("found '%s', expected: identifier", literal)
+		return "", "", err
+	}
+	if err := validateLabelKey(literal); err != nil {
+		return "", "", err
+	}
+	if t, _ := p.lookahead(Values); t == EndOfStringToken || t == CommaToken {
+		if operator != selection.DoesNotExist {
+			operator = selection.Exists
+		}
+	}
+	return literal, operator, nil
+}
+
+// parseOperator return operator and eventually matchType
+// matchType can be exact
+func (p *Parser) parseOperator() (op selection.Operator, err error) {
+	tok, lit := p.consume(KeyAndOperator)
+	switch tok {
+	// DoesNotExistToken shouldn't be here because it's a unary operator, not a binary operator
+	case InToken:
+		op = selection.In
+	case EqualsToken:
+		op = selection.Equals
+	case DoubleEqualsToken:
+		op = selection.DoubleEquals
+	case GreaterThanToken:
+		op = selection.GreaterThan
+	case LessThanToken:
+		op = selection.LessThan
+	case NotInToken:
+		op = selection.NotIn
+	case NotEqualsToken:
+		op = selection.NotEquals
+	default:
+		return "", fmt.Errorf("found '%s', expected: '=', '!=', '==', 'in', notin'", lit)
+	}
+	return op, nil
+}
+
+// parseValues parses the values for set based matching (x,y,z)
+func (p *Parser) parseValues() (sets.String, error) {
+	tok, lit := p.consume(Values)
+	if tok != OpenParToken {
+		return nil, fmt.Errorf("found '%s' expected: '('", lit)
+	}
+	tok, lit = p.lookahead(Values)
+	switch tok {
+	case IdentifierToken, CommaToken:
+		s, err := p.parseIdentifiersList() // handles general cases
+		if err != nil {
+			return s, err
+		}
+		if tok, _ = p.consume(Values); tok != ClosedParToken {
+			return nil, fmt.Errorf("found '%s', expected: ')'", lit)
+		}
+		return s, nil
+	case ClosedParToken: // handles "()"
+		p.consume(Values)
+		return sets.NewString(""), nil
+	default:
+		return nil, fmt.Errorf("found '%s', expected: ',', ')' or identifier", lit)
+	}
+}
+
+// parseIdentifiersList parses a (possibly empty) list of
+// of comma separated (possibly empty) identifiers
+func (p *Parser) parseIdentifiersList() (sets.String, error) {
+	s := sets.NewString()
+	for {
+		tok, lit := p.consume(Values)
+		switch tok {
+		case IdentifierToken:
+			s.Insert(lit)
+			tok2, lit2 := p.lookahead(Values)
+			switch tok2 {
+			case CommaToken:
+				continue
+			case ClosedParToken:
+				return s, nil
+			default:
+				return nil, fmt.Errorf("found '%s', expected: ',' or ')'", lit2)
+			}
+		case CommaToken: // handled here since we can have "(,"
+			if s.Len() == 0 {
+				s.Insert("") // to handle (,
+			}
+			tok2, _ := p.lookahead(Values)
+			if tok2 == ClosedParToken {
+				s.Insert("") // to handle ,)  Double "" removed by StringSet
+				return s, nil
+			}
+			if tok2 == CommaToken {
+				p.consume(Values)
+				s.Insert("") // to handle ,, Double "" removed by StringSet
+			}
+		default: // it can be operator
+			return s, fmt.Errorf("found '%s', expected: ',', or identifier", lit)
+		}
+	}
+}
+
+// parseExactValue parses the only value for exact match style
+func (p *Parser) parseExactValue() (sets.String, error) {
+	s := sets.NewString()
+	tok, lit := p.lookahead(Values)
+	if tok == EndOfStringToken || tok == CommaToken {
+		s.Insert("")
+		return s, nil
+	}
+	tok, lit = p.consume(Values)
+	if tok == IdentifierToken {
+		s.Insert(lit)
+		return s, nil
+	}
+	return nil, fmt.Errorf("found '%s', expected: identifier", lit)
+}
+
+// Parse takes a string representing a selector and returns a selector
+// object, or an error. This parsing function differs from ParseSelector
+// as they parse different selectors with different syntaxes.
+// The input will cause an error if it does not follow this form:
+//
+//  <selector-syntax>         ::= <requirement> | <requirement> "," <selector-syntax>
+//  <requirement>             ::= [!] KEY [ <set-based-restriction> | <exact-match-restriction> ]
+//  <set-based-restriction>   ::= "" | <inclusion-exclusion> <value-set>
+//  <inclusion-exclusion>     ::= <inclusion> | <exclusion>
+//  <exclusion>               ::= "notin"
+//  <inclusion>               ::= "in"
+//  <value-set>               ::= "(" <values> ")"
+//  <values>                  ::= VALUE | VALUE "," <values>
+//  <exact-match-restriction> ::= ["="|"=="|"!="] VALUE
+//
+// KEY is a sequence of one or more characters following [ DNS_SUBDOMAIN "/" ] DNS_LABEL. Max length is 63 characters.
+// VALUE is a sequence of zero or more characters "([A-Za-z0-9_-\.])". Max length is 63 characters.
+// Delimiter is white space: (' ', '\t')
+// Example of valid syntax:
+//  "x in (foo,,baz),y,z notin ()"
+//
+// Note:
+//  (1) Inclusion - " in " - denotes that the KEY exists and is equal to any of the
+//      VALUEs in its requirement
+//  (2) Exclusion - " notin " - denotes that the KEY is not equal to any
+//      of the VALUEs in its requirement or does not exist
+//  (3) The empty string is a valid VALUE
+//  (4) A requirement with just a KEY - as in "y" above - denotes that
+//      the KEY exists and can be any VALUE.
+//  (5) A requirement with just !KEY requires that the KEY not exist.
+//
+func Parse(selector string) (Selector, error) {
+	parsedSelector, err := parse(selector)
+	if err == nil {
+		return parsedSelector, nil
+	}
+	return nil, err
+}
+
+// parse parses the string representation of the selector and returns the internalSelector struct.
+// The callers of this method can then decide how to return the internalSelector struct to their
+// callers. This function has two callers now, one returns a Selector interface and the other
+// returns a list of requirements.
+func parse(selector string) (internalSelector, error) {
+	p := &Parser{l: &Lexer{s: selector, pos: 0}}
+	items, err := p.parse()
+	if err != nil {
+		return nil, err
+	}
+	sort.Sort(ByKey(items)) // sort to grant determistic parsing
+	return internalSelector(items), err
+}
+
+func validateLabelKey(k string) error {
+	if errs := validation.IsQualifiedName(k); len(errs) != 0 {
+		return fmt.Errorf("invalid label key %q: %s", k, strings.Join(errs, "; "))
+	}
+	return nil
+}
+
+func validateLabelValue(k, v string) error {
+	if errs := validation.IsValidLabelValue(v); len(errs) != 0 {
+		return fmt.Errorf("invalid label value: %q: at key: %q: %s", v, k, strings.Join(errs, "; "))
+	}
+	return nil
+}
+
+// SelectorFromSet returns a Selector which will match exactly the given Set. A
+// nil and empty Sets are considered equivalent to Everything().
+// It does not perform any validation, which means the server will reject
+// the request if the Set contains invalid values.
+func SelectorFromSet(ls Set) Selector {
+	return SelectorFromValidatedSet(ls)
+}
+
+// ValidatedSelectorFromSet returns a Selector which will match exactly the given Set. A
+// nil and empty Sets are considered equivalent to Everything().
+// The Set is validated client-side, which allows to catch errors early.
+func ValidatedSelectorFromSet(ls Set) (Selector, error) {
+	if ls == nil || len(ls) == 0 {
+		return internalSelector{}, nil
+	}
+	requirements := make([]Requirement, 0, len(ls))
+	for label, value := range ls {
+		r, err := NewRequirement(label, selection.Equals, []string{value})
+		if err != nil {
+			return nil, err
+		}
+		requirements = append(requirements, *r)
+	}
+	// sort to have deterministic string representation
+	sort.Sort(ByKey(requirements))
+	return internalSelector(requirements), nil
+}
+
+// SelectorFromValidatedSet returns a Selector which will match exactly the given Set.
+// A nil and empty Sets are considered equivalent to Everything().
+// It assumes that Set is already validated and doesn't do any validation.
+func SelectorFromValidatedSet(ls Set) Selector {
+	if ls == nil || len(ls) == 0 {
+		return internalSelector{}
+	}
+	requirements := make([]Requirement, 0, len(ls))
+	for label, value := range ls {
+		requirements = append(requirements, Requirement{key: label, operator: selection.Equals, strValues: []string{value}})
+	}
+	// sort to have deterministic string representation
+	sort.Sort(ByKey(requirements))
+	return internalSelector(requirements)
+}
+
+// ParseToRequirements takes a string representing a selector and returns a list of
+// requirements. This function is suitable for those callers that perform additional
+// processing on selector requirements.
+// See the documentation for Parse() function for more details.
+// TODO: Consider exporting the internalSelector type instead.
+func ParseToRequirements(selector string) ([]Requirement, error) {
+	return parse(selector)
+}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/selection/operator.go

@@ -0,0 +1,36 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/selection/operator.go
+
+/*
+Copyright 2016 The Kubernetes Authors.
+
+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 selection
+
+// Operator represents a key/field's relationship to value(s).
+// See labels.Requirement and fields.Requirement for more details.
+type Operator string
+
+const (
+	DoesNotExist Operator = "!"
+	Equals       Operator = "="
+	DoubleEquals Operator = "=="
+	In           Operator = "in"
+	NotEquals    Operator = "!="
+	NotIn        Operator = "notin"
+	Exists       Operator = "exists"
+	GreaterThan  Operator = "gt"
+	LessThan     Operator = "lt"
+)

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/errors/errors.go

@@ -0,0 +1,252 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/util/errors/errors.go
+
+/*
+Copyright 2015 The Kubernetes Authors.
+
+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 errors
+
+import (
+	"errors"
+	"fmt"
+
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/sets"
+)
+
+// MessageCountMap contains occurrence for each error message.
+type MessageCountMap map[string]int
+
+// Aggregate represents an object that contains multiple errors, but does not
+// necessarily have singular semantic meaning.
+// The aggregate can be used with `errors.Is()` to check for the occurrence of
+// a specific error type.
+// Errors.As() is not supported, because the caller presumably cares about a
+// specific error of potentially multiple that match the given type.
+type Aggregate interface {
+	error
+	Errors() []error
+	Is(error) bool
+}
+
+// NewAggregate converts a slice of errors into an Aggregate interface, which
+// is itself an implementation of the error interface.  If the slice is empty,
+// this returns nil.
+// It will check if any of the element of input error list is nil, to avoid
+// nil pointer panic when call Error().
+func NewAggregate(errlist []error) Aggregate {
+	if len(errlist) == 0 {
+		return nil
+	}
+	// In case of input error list contains nil
+	var errs []error
+	for _, e := range errlist {
+		if e != nil {
+			errs = append(errs, e)
+		}
+	}
+	if len(errs) == 0 {
+		return nil
+	}
+	return aggregate(errs)
+}
+
+// This helper implements the error and Errors interfaces.  Keeping it private
+// prevents people from making an aggregate of 0 errors, which is not
+// an error, but does satisfy the error interface.
+type aggregate []error
+
+// Error is part of the error interface.
+func (agg aggregate) Error() string {
+	if len(agg) == 0 {
+		// This should never happen, really.
+		return ""
+	}
+	if len(agg) == 1 {
+		return agg[0].Error()
+	}
+	seenerrs := sets.NewString()
+	result := ""
+	agg.visit(func(err error) bool {
+		msg := err.Error()
+		if seenerrs.Has(msg) {
+			return false
+		}
+		seenerrs.Insert(msg)
+		if len(seenerrs) > 1 {
+			result += ", "
+		}
+		result += msg
+		return false
+	})
+	if len(seenerrs) == 1 {
+		return result
+	}
+	return "[" + result + "]"
+}
+
+func (agg aggregate) Is(target error) bool {
+	return agg.visit(func(err error) bool {
+		return errors.Is(err, target)
+	})
+}
+
+func (agg aggregate) visit(f func(err error) bool) bool {
+	for _, err := range agg {
+		switch err := err.(type) {
+		case aggregate:
+			if match := err.visit(f); match {
+				return match
+			}
+		case Aggregate:
+			for _, nestedErr := range err.Errors() {
+				if match := f(nestedErr); match {
+					return match
+				}
+			}
+		default:
+			if match := f(err); match {
+				return match
+			}
+		}
+	}
+
+	return false
+}
+
+// Errors is part of the Aggregate interface.
+func (agg aggregate) Errors() []error {
+	return []error(agg)
+}
+
+// Matcher is used to match errors.  Returns true if the error matches.
+type Matcher func(error) bool
+
+// FilterOut removes all errors that match any of the matchers from the input
+// error.  If the input is a singular error, only that error is tested.  If the
+// input implements the Aggregate interface, the list of errors will be
+// processed recursively.
+//
+// This can be used, for example, to remove known-OK errors (such as io.EOF or
+// os.PathNotFound) from a list of errors.
+func FilterOut(err error, fns ...Matcher) error {
+	if err == nil {
+		return nil
+	}
+	if agg, ok := err.(Aggregate); ok {
+		return NewAggregate(filterErrors(agg.Errors(), fns...))
+	}
+	if !matchesError(err, fns...) {
+		return err
+	}
+	return nil
+}
+
+// matchesError returns true if any Matcher returns true
+func matchesError(err error, fns ...Matcher) bool {
+	for _, fn := range fns {
+		if fn(err) {
+			return true
+		}
+	}
+	return false
+}
+
+// filterErrors returns any errors (or nested errors, if the list contains
+// nested Errors) for which all fns return false. If no errors
+// remain a nil list is returned. The resulting silec will have all
+// nested slices flattened as a side effect.
+func filterErrors(list []error, fns ...Matcher) []error {
+	result := []error{}
+	for _, err := range list {
+		r := FilterOut(err, fns...)
+		if r != nil {
+			result = append(result, r)
+		}
+	}
+	return result
+}
+
+// Flatten takes an Aggregate, which may hold other Aggregates in arbitrary
+// nesting, and flattens them all into a single Aggregate, recursively.
+func Flatten(agg Aggregate) Aggregate {
+	result := []error{}
+	if agg == nil {
+		return nil
+	}
+	for _, err := range agg.Errors() {
+		if a, ok := err.(Aggregate); ok {
+			r := Flatten(a)
+			if r != nil {
+				result = append(result, r.Errors()...)
+			}
+		} else {
+			if err != nil {
+				result = append(result, err)
+			}
+		}
+	}
+	return NewAggregate(result)
+}
+
+// CreateAggregateFromMessageCountMap converts MessageCountMap Aggregate
+func CreateAggregateFromMessageCountMap(m MessageCountMap) Aggregate {
+	if m == nil {
+		return nil
+	}
+	result := make([]error, 0, len(m))
+	for errStr, count := range m {
+		var countStr string
+		if count > 1 {
+			countStr = fmt.Sprintf(" (repeated %v times)", count)
+		}
+		result = append(result, fmt.Errorf("%v%v", errStr, countStr))
+	}
+	return NewAggregate(result)
+}
+
+// Reduce will return err or, if err is an Aggregate and only has one item,
+// the first item in the aggregate.
+func Reduce(err error) error {
+	if agg, ok := err.(Aggregate); ok && err != nil {
+		switch len(agg.Errors()) {
+		case 1:
+			return agg.Errors()[0]
+		case 0:
+			return nil
+		}
+	}
+	return err
+}
+
+// AggregateGoroutines runs the provided functions in parallel, stuffing all
+// non-nil errors into the returned Aggregate.
+// Returns nil if all the functions complete successfully.
+func AggregateGoroutines(funcs ...func() error) Aggregate {
+	errChan := make(chan error, len(funcs))
+	for _, f := range funcs {
+		go func(f func() error) { errChan <- f() }(f)
+	}
+	errs := make([]error, 0)
+	for i := 0; i < cap(errChan); i++ {
+		if err := <-errChan; err != nil {
+			errs = append(errs, err)
+		}
+	}
+	return NewAggregate(errs)
+}
+
+// ErrPreconditionViolated is returned when the precondition is violated
+var ErrPreconditionViolated = errors.New("precondition is violated")

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/sets/empty.go

@@ -0,0 +1,24 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/util/sets/empty.go
+
+/*
+Copyright The Kubernetes Authors.
+
+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 sets
+
+// Empty is public since it is used by some internal API objects for conversions between external
+// string arrays and internal sets, and conversion logic requires public types today.
+type Empty struct{}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/sets/string.go

@@ -0,0 +1,206 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/util/sets/string.go
+
+/*
+Copyright The Kubernetes Authors.
+
+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 sets
+
+import (
+	"reflect"
+	"sort"
+)
+
+// sets.String is a set of strings, implemented via map[string]struct{} for minimal memory consumption.
+type String map[string]Empty
+
+// NewString creates a String from a list of values.
+func NewString(items ...string) String {
+	ss := String{}
+	ss.Insert(items...)
+	return ss
+}
+
+// StringKeySet creates a String from a keys of a map[string](? extends interface{}).
+// If the value passed in is not actually a map, this will panic.
+func StringKeySet(theMap interface{}) String {
+	v := reflect.ValueOf(theMap)
+	ret := String{}
+
+	for _, keyValue := range v.MapKeys() {
+		ret.Insert(keyValue.Interface().(string))
+	}
+	return ret
+}
+
+// Insert adds items to the set.
+func (s String) Insert(items ...string) String {
+	for _, item := range items {
+		s[item] = Empty{}
+	}
+	return s
+}
+
+// Delete removes all items from the set.
+func (s String) Delete(items ...string) String {
+	for _, item := range items {
+		delete(s, item)
+	}
+	return s
+}
+
+// Has returns true if and only if item is contained in the set.
+func (s String) Has(item string) bool {
+	_, contained := s[item]
+	return contained
+}
+
+// HasAll returns true if and only if all items are contained in the set.
+func (s String) HasAll(items ...string) bool {
+	for _, item := range items {
+		if !s.Has(item) {
+			return false
+		}
+	}
+	return true
+}
+
+// HasAny returns true if any items are contained in the set.
+func (s String) HasAny(items ...string) bool {
+	for _, item := range items {
+		if s.Has(item) {
+			return true
+		}
+	}
+	return false
+}
+
+// Difference returns a set of objects that are not in s2
+// For example:
+// s1 = {a1, a2, a3}
+// s2 = {a1, a2, a4, a5}
+// s1.Difference(s2) = {a3}
+// s2.Difference(s1) = {a4, a5}
+func (s String) Difference(s2 String) String {
+	result := NewString()
+	for key := range s {
+		if !s2.Has(key) {
+			result.Insert(key)
+		}
+	}
+	return result
+}
+
+// Union returns a new set which includes items in either s1 or s2.
+// For example:
+// s1 = {a1, a2}
+// s2 = {a3, a4}
+// s1.Union(s2) = {a1, a2, a3, a4}
+// s2.Union(s1) = {a1, a2, a3, a4}
+func (s1 String) Union(s2 String) String {
+	result := NewString()
+	for key := range s1 {
+		result.Insert(key)
+	}
+	for key := range s2 {
+		result.Insert(key)
+	}
+	return result
+}
+
+// Intersection returns a new set which includes the item in BOTH s1 and s2
+// For example:
+// s1 = {a1, a2}
+// s2 = {a2, a3}
+// s1.Intersection(s2) = {a2}
+func (s1 String) Intersection(s2 String) String {
+	var walk, other String
+	result := NewString()
+	if s1.Len() < s2.Len() {
+		walk = s1
+		other = s2
+	} else {
+		walk = s2
+		other = s1
+	}
+	for key := range walk {
+		if other.Has(key) {
+			result.Insert(key)
+		}
+	}
+	return result
+}
+
+// IsSuperset returns true if and only if s1 is a superset of s2.
+func (s1 String) IsSuperset(s2 String) bool {
+	for item := range s2 {
+		if !s1.Has(item) {
+			return false
+		}
+	}
+	return true
+}
+
+// Equal returns true if and only if s1 is equal (as a set) to s2.
+// Two sets are equal if their membership is identical.
+// (In practice, this means same elements, order doesn't matter)
+func (s1 String) Equal(s2 String) bool {
+	return len(s1) == len(s2) && s1.IsSuperset(s2)
+}
+
+type sortableSliceOfString []string
+
+func (s sortableSliceOfString) Len() int           { return len(s) }
+func (s sortableSliceOfString) Less(i, j int) bool { return lessString(s[i], s[j]) }
+func (s sortableSliceOfString) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
+// List returns the contents as a sorted string slice.
+func (s String) List() []string {
+	res := make(sortableSliceOfString, 0, len(s))
+	for key := range s {
+		res = append(res, key)
+	}
+	sort.Sort(res)
+	return []string(res)
+}
+
+// UnsortedList returns the slice with contents in random order.
+func (s String) UnsortedList() []string {
+	res := make([]string, 0, len(s))
+	for key := range s {
+		res = append(res, key)
+	}
+	return res
+}
+
+// Returns a single element from the set.
+func (s String) PopAny() (string, bool) {
+	for key := range s {
+		s.Delete(key)
+		return key, true
+	}
+	var zeroValue string
+	return zeroValue, false
+}
+
+// Len returns the size of the set.
+func (s String) Len() int {
+	return len(s)
+}
+
+func lessString(lhs, rhs string) bool {
+	return lhs < rhs
+}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/validation/field/errors.go

@@ -0,0 +1,275 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/util/validation/field/errors.go
+
+/*
+Copyright 2014 The Kubernetes Authors.
+
+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 field
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+
+	utilerrors "sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/errors"
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/sets"
+)
+
+// Error is an implementation of the 'error' interface, which represents a
+// field-level validation error.
+type Error struct {
+	Type     ErrorType
+	Field    string
+	BadValue interface{}
+	Detail   string
+}
+
+var _ error = &Error{}
+
+// Error implements the error interface.
+func (v *Error) Error() string {
+	return fmt.Sprintf("%s: %s", v.Field, v.ErrorBody())
+}
+
+// ErrorBody returns the error message without the field name.  This is useful
+// for building nice-looking higher-level error reporting.
+func (v *Error) ErrorBody() string {
+	var s string
+	switch v.Type {
+	case ErrorTypeRequired, ErrorTypeForbidden, ErrorTypeTooLong, ErrorTypeInternal:
+		s = v.Type.String()
+	default:
+		value := v.BadValue
+		valueType := reflect.TypeOf(value)
+		if value == nil || valueType == nil {
+			value = "null"
+		} else if valueType.Kind() == reflect.Ptr {
+			if reflectValue := reflect.ValueOf(value); reflectValue.IsNil() {
+				value = "null"
+			} else {
+				value = reflectValue.Elem().Interface()
+			}
+		}
+		switch t := value.(type) {
+		case int64, int32, float64, float32, bool:
+			// use simple printer for simple types
+			s = fmt.Sprintf("%s: %v", v.Type, value)
+		case string:
+			s = fmt.Sprintf("%s: %q", v.Type, t)
+		case fmt.Stringer:
+			// anything that defines String() is better than raw struct
+			s = fmt.Sprintf("%s: %s", v.Type, t.String())
+		default:
+			// fallback to raw struct
+			// TODO: internal types have panic guards against json.Marshalling to prevent
+			// accidental use of internal types in external serialized form.  For now, use
+			// %#v, although it would be better to show a more expressive output in the future
+			s = fmt.Sprintf("%s: %#v", v.Type, value)
+		}
+	}
+	if len(v.Detail) != 0 {
+		s += fmt.Sprintf(": %s", v.Detail)
+	}
+	return s
+}
+
+// ErrorType is a machine readable value providing more detail about why
+// a field is invalid.  These values are expected to match 1-1 with
+// CauseType in api/types.go.
+type ErrorType string
+
+// TODO: These values are duplicated in api/types.go, but there's a circular dep.  Fix it.
+const (
+	// ErrorTypeNotFound is used to report failure to find a requested value
+	// (e.g. looking up an ID).  See NotFound().
+	ErrorTypeNotFound ErrorType = "FieldValueNotFound"
+	// ErrorTypeRequired is used to report required values that are not
+	// provided (e.g. empty strings, null values, or empty arrays).  See
+	// Required().
+	ErrorTypeRequired ErrorType = "FieldValueRequired"
+	// ErrorTypeDuplicate is used to report collisions of values that must be
+	// unique (e.g. unique IDs).  See Duplicate().
+	ErrorTypeDuplicate ErrorType = "FieldValueDuplicate"
+	// ErrorTypeInvalid is used to report malformed values (e.g. failed regex
+	// match, too long, out of bounds).  See Invalid().
+	ErrorTypeInvalid ErrorType = "FieldValueInvalid"
+	// ErrorTypeNotSupported is used to report unknown values for enumerated
+	// fields (e.g. a list of valid values).  See NotSupported().
+	ErrorTypeNotSupported ErrorType = "FieldValueNotSupported"
+	// ErrorTypeForbidden is used to report valid (as per formatting rules)
+	// values which would be accepted under some conditions, but which are not
+	// permitted by the current conditions (such as security policy).  See
+	// Forbidden().
+	ErrorTypeForbidden ErrorType = "FieldValueForbidden"
+	// ErrorTypeTooLong is used to report that the given value is too long.
+	// This is similar to ErrorTypeInvalid, but the error will not include the
+	// too-long value.  See TooLong().
+	ErrorTypeTooLong ErrorType = "FieldValueTooLong"
+	// ErrorTypeTooMany is used to report "too many". This is used to
+	// report that a given list has too many items. This is similar to FieldValueTooLong,
+	// but the error indicates quantity instead of length.
+	ErrorTypeTooMany ErrorType = "FieldValueTooMany"
+	// ErrorTypeInternal is used to report other errors that are not related
+	// to user input.  See InternalError().
+	ErrorTypeInternal ErrorType = "InternalError"
+)
+
+// String converts a ErrorType into its corresponding canonical error message.
+func (t ErrorType) String() string {
+	switch t {
+	case ErrorTypeNotFound:
+		return "Not found"
+	case ErrorTypeRequired:
+		return "Required value"
+	case ErrorTypeDuplicate:
+		return "Duplicate value"
+	case ErrorTypeInvalid:
+		return "Invalid value"
+	case ErrorTypeNotSupported:
+		return "Unsupported value"
+	case ErrorTypeForbidden:
+		return "Forbidden"
+	case ErrorTypeTooLong:
+		return "Too long"
+	case ErrorTypeTooMany:
+		return "Too many"
+	case ErrorTypeInternal:
+		return "Internal error"
+	default:
+		panic(fmt.Sprintf("unrecognized validation error: %q", string(t)))
+	}
+}
+
+// NotFound returns a *Error indicating "value not found".  This is
+// used to report failure to find a requested value (e.g. looking up an ID).
+func NotFound(field *Path, value interface{}) *Error {
+	return &Error{ErrorTypeNotFound, field.String(), value, ""}
+}
+
+// Required returns a *Error indicating "value required".  This is used
+// to report required values that are not provided (e.g. empty strings, null
+// values, or empty arrays).
+func Required(field *Path, detail string) *Error {
+	return &Error{ErrorTypeRequired, field.String(), "", detail}
+}
+
+// Duplicate returns a *Error indicating "duplicate value".  This is
+// used to report collisions of values that must be unique (e.g. names or IDs).
+func Duplicate(field *Path, value interface{}) *Error {
+	return &Error{ErrorTypeDuplicate, field.String(), value, ""}
+}
+
+// Invalid returns a *Error indicating "invalid value".  This is used
+// to report malformed values (e.g. failed regex match, too long, out of bounds).
+func Invalid(field *Path, value interface{}, detail string) *Error {
+	return &Error{ErrorTypeInvalid, field.String(), value, detail}
+}
+
+// NotSupported returns a *Error indicating "unsupported value".
+// This is used to report unknown values for enumerated fields (e.g. a list of
+// valid values).
+func NotSupported(field *Path, value interface{}, validValues []string) *Error {
+	detail := ""
+	if validValues != nil && len(validValues) > 0 {
+		quotedValues := make([]string, len(validValues))
+		for i, v := range validValues {
+			quotedValues[i] = strconv.Quote(v)
+		}
+		detail = "supported values: " + strings.Join(quotedValues, ", ")
+	}
+	return &Error{ErrorTypeNotSupported, field.String(), value, detail}
+}
+
+// Forbidden returns a *Error indicating "forbidden".  This is used to
+// report valid (as per formatting rules) values which would be accepted under
+// some conditions, but which are not permitted by current conditions (e.g.
+// security policy).
+func Forbidden(field *Path, detail string) *Error {
+	return &Error{ErrorTypeForbidden, field.String(), "", detail}
+}
+
+// TooLong returns a *Error indicating "too long".  This is used to
+// report that the given value is too long.  This is similar to
+// Invalid, but the returned error will not include the too-long
+// value.
+func TooLong(field *Path, value interface{}, maxLength int) *Error {
+	return &Error{ErrorTypeTooLong, field.String(), value, fmt.Sprintf("must have at most %d bytes", maxLength)}
+}
+
+// TooMany returns a *Error indicating "too many". This is used to
+// report that a given list has too many items. This is similar to TooLong,
+// but the returned error indicates quantity instead of length.
+func TooMany(field *Path, actualQuantity, maxQuantity int) *Error {
+	return &Error{ErrorTypeTooMany, field.String(), actualQuantity, fmt.Sprintf("must have at most %d items", maxQuantity)}
+}
+
+// InternalError returns a *Error indicating "internal error".  This is used
+// to signal that an error was found that was not directly related to user
+// input.  The err argument must be non-nil.
+func InternalError(field *Path, err error) *Error {
+	return &Error{ErrorTypeInternal, field.String(), nil, err.Error()}
+}
+
+// ErrorList holds a set of Errors.  It is plausible that we might one day have
+// non-field errors in this same umbrella package, but for now we don't, so
+// we can keep it simple and leave ErrorList here.
+type ErrorList []*Error
+
+// NewErrorTypeMatcher returns an errors.Matcher that returns true
+// if the provided error is a Error and has the provided ErrorType.
+func NewErrorTypeMatcher(t ErrorType) utilerrors.Matcher {
+	return func(err error) bool {
+		if e, ok := err.(*Error); ok {
+			return e.Type == t
+		}
+		return false
+	}
+}
+
+// ToAggregate converts the ErrorList into an errors.Aggregate.
+func (list ErrorList) ToAggregate() utilerrors.Aggregate {
+	errs := make([]error, 0, len(list))
+	errorMsgs := sets.NewString()
+	for _, err := range list {
+		msg := fmt.Sprintf("%v", err)
+		if errorMsgs.Has(msg) {
+			continue
+		}
+		errorMsgs.Insert(msg)
+		errs = append(errs, err)
+	}
+	return utilerrors.NewAggregate(errs)
+}
+
+func fromAggregate(agg utilerrors.Aggregate) ErrorList {
+	errs := agg.Errors()
+	list := make(ErrorList, len(errs))
+	for i := range errs {
+		list[i] = errs[i].(*Error)
+	}
+	return list
+}
+
+// Filter removes items from the ErrorList that match the provided fns.
+func (list ErrorList) Filter(fns ...utilerrors.Matcher) ErrorList {
+	err := utilerrors.FilterOut(list.ToAggregate(), fns...)
+	if err == nil {
+		return nil
+	}
+	// FilterOut takes an Aggregate and returns an Aggregate
+	return fromAggregate(err.(utilerrors.Aggregate))
+}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/validation/field/path.go

@@ -0,0 +1,94 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/util/validation/field/path.go
+
+/*
+Copyright 2015 The Kubernetes Authors.
+
+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 field
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+)
+
+// Path represents the path from some root to a particular field.
+type Path struct {
+	name   string // the name of this field or "" if this is an index
+	index  string // if name == "", this is a subscript (index or map key) of the previous element
+	parent *Path  // nil if this is the root element
+}
+
+// NewPath creates a root Path object.
+func NewPath(name string, moreNames ...string) *Path {
+	r := &Path{name: name, parent: nil}
+	for _, anotherName := range moreNames {
+		r = &Path{name: anotherName, parent: r}
+	}
+	return r
+}
+
+// Root returns the root element of this Path.
+func (p *Path) Root() *Path {
+	for ; p.parent != nil; p = p.parent {
+		// Do nothing.
+	}
+	return p
+}
+
+// Child creates a new Path that is a child of the method receiver.
+func (p *Path) Child(name string, moreNames ...string) *Path {
+	r := NewPath(name, moreNames...)
+	r.Root().parent = p
+	return r
+}
+
+// Index indicates that the previous Path is to be subscripted by an int.
+// This sets the same underlying value as Key.
+func (p *Path) Index(index int) *Path {
+	return &Path{index: strconv.Itoa(index), parent: p}
+}
+
+// Key indicates that the previous Path is to be subscripted by a string.
+// This sets the same underlying value as Index.
+func (p *Path) Key(key string) *Path {
+	return &Path{index: key, parent: p}
+}
+
+// String produces a string representation of the Path.
+func (p *Path) String() string {
+	// make a slice to iterate
+	elems := []*Path{}
+	for ; p != nil; p = p.parent {
+		elems = append(elems, p)
+	}
+
+	// iterate, but it has to be backwards
+	buf := bytes.NewBuffer(nil)
+	for i := range elems {
+		p := elems[len(elems)-1-i]
+		if p.parent != nil && len(p.name) > 0 {
+			// This is either the root or it is a subscript.
+			buf.WriteString(".")
+		}
+		if len(p.name) > 0 {
+			buf.WriteString(p.name)
+		} else {
+			fmt.Fprintf(buf, "[%s]", p.index)
+		}
+	}
+	return buf.String()
+}

vendor/sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/validation/validation.go

@@ -0,0 +1,506 @@
+// Code generated by k8scopy from k8s.io/apimachinery@v0.19.8; DO NOT EDIT.
+// File content copied from k8s.io/apimachinery@v0.19.8/pkg/util/validation/validation.go
+
+/*
+Copyright 2014 The Kubernetes Authors.
+
+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 validation
+
+import (
+	"fmt"
+	"math"
+	"net"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/util/validation/field"
+)
+
+const qnameCharFmt string = "[A-Za-z0-9]"
+const qnameExtCharFmt string = "[-A-Za-z0-9_.]"
+const qualifiedNameFmt string = "(" + qnameCharFmt + qnameExtCharFmt + "*)?" + qnameCharFmt
+const qualifiedNameErrMsg string = "must consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character"
+const qualifiedNameMaxLength int = 63
+
+var qualifiedNameRegexp = regexp.MustCompile("^" + qualifiedNameFmt + "$")
+
+// IsQualifiedName tests whether the value passed is what Kubernetes calls a
+// "qualified name".  This is a format used in various places throughout the
+// system.  If the value is not valid, a list of error strings is returned.
+// Otherwise an empty list (or nil) is returned.
+func IsQualifiedName(value string) []string {
+	var errs []string
+	parts := strings.Split(value, "/")
+	var name string
+	switch len(parts) {
+	case 1:
+		name = parts[0]
+	case 2:
+		var prefix string
+		prefix, name = parts[0], parts[1]
+		if len(prefix) == 0 {
+			errs = append(errs, "prefix part "+EmptyError())
+		} else if msgs := IsDNS1123Subdomain(prefix); len(msgs) != 0 {
+			errs = append(errs, prefixEach(msgs, "prefix part ")...)
+		}
+	default:
+		return append(errs, "a qualified name "+RegexError(qualifiedNameErrMsg, qualifiedNameFmt, "MyName", "my.name", "123-abc")+
+			" with an optional DNS subdomain prefix and '/' (e.g. 'example.com/MyName')")
+	}
+
+	if len(name) == 0 {
+		errs = append(errs, "name part "+EmptyError())
+	} else if len(name) > qualifiedNameMaxLength {
+		errs = append(errs, "name part "+MaxLenError(qualifiedNameMaxLength))
+	}
+	if !qualifiedNameRegexp.MatchString(name) {
+		errs = append(errs, "name part "+RegexError(qualifiedNameErrMsg, qualifiedNameFmt, "MyName", "my.name", "123-abc"))
+	}
+	return errs
+}
+
+// IsFullyQualifiedName checks if the name is fully qualified. This is similar
+// to IsFullyQualifiedDomainName but requires a minimum of 3 segments instead of
+// 2 and does not accept a trailing . as valid.
+// TODO: This function is deprecated and preserved until all callers migrate to
+// IsFullyQualifiedDomainName; please don't add new callers.
+func IsFullyQualifiedName(fldPath *field.Path, name string) field.ErrorList {
+	var allErrors field.ErrorList
+	if len(name) == 0 {
+		return append(allErrors, field.Required(fldPath, ""))
+	}
+	if errs := IsDNS1123Subdomain(name); len(errs) > 0 {
+		return append(allErrors, field.Invalid(fldPath, name, strings.Join(errs, ",")))
+	}
+	if len(strings.Split(name, ".")) < 3 {
+		return append(allErrors, field.Invalid(fldPath, name, "should be a domain with at least three segments separated by dots"))
+	}
+	return allErrors
+}
+
+// IsFullyQualifiedDomainName checks if the domain name is fully qualified. This
+// is similar to IsFullyQualifiedName but only requires a minimum of 2 segments
+// instead of 3 and accepts a trailing . as valid.
+func IsFullyQualifiedDomainName(fldPath *field.Path, name string) field.ErrorList {
+	var allErrors field.ErrorList
+	if len(name) == 0 {
+		return append(allErrors, field.Required(fldPath, ""))
+	}
+	if strings.HasSuffix(name, ".") {
+		name = name[:len(name)-1]
+	}
+	if errs := IsDNS1123Subdomain(name); len(errs) > 0 {
+		return append(allErrors, field.Invalid(fldPath, name, strings.Join(errs, ",")))
+	}
+	if len(strings.Split(name, ".")) < 2 {
+		return append(allErrors, field.Invalid(fldPath, name, "should be a domain with at least two segments separated by dots"))
+	}
+	for _, label := range strings.Split(name, ".") {
+		if errs := IsDNS1123Label(label); len(errs) > 0 {
+			return append(allErrors, field.Invalid(fldPath, label, strings.Join(errs, ",")))
+		}
+	}
+	return allErrors
+}
+
+// Allowed characters in an HTTP Path as defined by RFC 3986. A HTTP path may
+// contain:
+// * unreserved characters (alphanumeric, '-', '.', '_', '~')
+// * percent-encoded octets
+// * sub-delims ("!", "$", "&", "'", "(", ")", "*", "+", ",", ";", "=")
+// * a colon character (":")
+const httpPathFmt string = `[A-Za-z0-9/\-._~%!$&'()*+,;=:]+`
+
+var httpPathRegexp = regexp.MustCompile("^" + httpPathFmt + "$")
+
+// IsDomainPrefixedPath checks if the given string is a domain-prefixed path
+// (e.g. acme.io/foo). All characters before the first "/" must be a valid
+// subdomain as defined by RFC 1123. All characters trailing the first "/" must
+// be valid HTTP Path characters as defined by RFC 3986.
+func IsDomainPrefixedPath(fldPath *field.Path, dpPath string) field.ErrorList {
+	var allErrs field.ErrorList
+	if len(dpPath) == 0 {
+		return append(allErrs, field.Required(fldPath, ""))
+	}
+
+	segments := strings.SplitN(dpPath, "/", 2)
+	if len(segments) != 2 || len(segments[0]) == 0 || len(segments[1]) == 0 {
+		return append(allErrs, field.Invalid(fldPath, dpPath, "must be a domain-prefixed path (such as \"acme.io/foo\")"))
+	}
+
+	host := segments[0]
+	for _, err := range IsDNS1123Subdomain(host) {
+		allErrs = append(allErrs, field.Invalid(fldPath, host, err))
+	}
+
+	path := segments[1]
+	if !httpPathRegexp.MatchString(path) {
+		return append(allErrs, field.Invalid(fldPath, path, RegexError("Invalid path", httpPathFmt)))
+	}
+
+	return allErrs
+}
+
+const labelValueFmt string = "(" + qualifiedNameFmt + ")?"
+const labelValueErrMsg string = "a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character"
+
+// LabelValueMaxLength is a label's max length
+const LabelValueMaxLength int = 63
+
+var labelValueRegexp = regexp.MustCompile("^" + labelValueFmt + "$")
+
+// IsValidLabelValue tests whether the value passed is a valid label value.  If
+// the value is not valid, a list of error strings is returned.  Otherwise an
+// empty list (or nil) is returned.
+func IsValidLabelValue(value string) []string {
+	var errs []string
+	if len(value) > LabelValueMaxLength {
+		errs = append(errs, MaxLenError(LabelValueMaxLength))
+	}
+	if !labelValueRegexp.MatchString(value) {
+		errs = append(errs, RegexError(labelValueErrMsg, labelValueFmt, "MyValue", "my_value", "12345"))
+	}
+	return errs
+}
+
+const dns1123LabelFmt string = "[a-z0-9]([-a-z0-9]*[a-z0-9])?"
+const dns1123LabelErrMsg string = "a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character"
+
+// DNS1123LabelMaxLength is a label's max length in DNS (RFC 1123)
+const DNS1123LabelMaxLength int = 63
+
+var dns1123LabelRegexp = regexp.MustCompile("^" + dns1123LabelFmt + "$")
+
+// IsDNS1123Label tests for a string that conforms to the definition of a label in
+// DNS (RFC 1123).
+func IsDNS1123Label(value string) []string {
+	var errs []string
+	if len(value) > DNS1123LabelMaxLength {
+		errs = append(errs, MaxLenError(DNS1123LabelMaxLength))
+	}
+	if !dns1123LabelRegexp.MatchString(value) {
+		errs = append(errs, RegexError(dns1123LabelErrMsg, dns1123LabelFmt, "my-name", "123-abc"))
+	}
+	return errs
+}
+
+const dns1123SubdomainFmt string = dns1123LabelFmt + "(\\." + dns1123LabelFmt + ")*"
+const dns1123SubdomainErrorMsg string = "a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character"
+
+// DNS1123SubdomainMaxLength is a subdomain's max length in DNS (RFC 1123)
+const DNS1123SubdomainMaxLength int = 253
+
+var dns1123SubdomainRegexp = regexp.MustCompile("^" + dns1123SubdomainFmt + "$")
+
+// IsDNS1123Subdomain tests for a string that conforms to the definition of a
+// subdomain in DNS (RFC 1123).
+func IsDNS1123Subdomain(value string) []string {
+	var errs []string
+	if len(value) > DNS1123SubdomainMaxLength {
+		errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
+	}
+	if !dns1123SubdomainRegexp.MatchString(value) {
+		errs = append(errs, RegexError(dns1123SubdomainErrorMsg, dns1123SubdomainFmt, "example.com"))
+	}
+	return errs
+}
+
+const dns1035LabelFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
+const dns1035LabelErrMsg string = "a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character"
+
+// DNS1035LabelMaxLength is a label's max length in DNS (RFC 1035)
+const DNS1035LabelMaxLength int = 63
+
+var dns1035LabelRegexp = regexp.MustCompile("^" + dns1035LabelFmt + "$")
+
+// IsDNS1035Label tests for a string that conforms to the definition of a label in
+// DNS (RFC 1035).
+func IsDNS1035Label(value string) []string {
+	var errs []string
+	if len(value) > DNS1035LabelMaxLength {
+		errs = append(errs, MaxLenError(DNS1035LabelMaxLength))
+	}
+	if !dns1035LabelRegexp.MatchString(value) {
+		errs = append(errs, RegexError(dns1035LabelErrMsg, dns1035LabelFmt, "my-name", "abc-123"))
+	}
+	return errs
+}
+
+// wildcard definition - RFC 1034 section 4.3.3.
+// examples:
+// - valid: *.bar.com, *.foo.bar.com
+// - invalid: *.*.bar.com, *.foo.*.com, *bar.com, f*.bar.com, *
+const wildcardDNS1123SubdomainFmt = "\\*\\." + dns1123SubdomainFmt
+const wildcardDNS1123SubdomainErrMsg = "a wildcard DNS-1123 subdomain must start with '*.', followed by a valid DNS subdomain, which must consist of lower case alphanumeric characters, '-' or '.' and end with an alphanumeric character"
+
+// IsWildcardDNS1123Subdomain tests for a string that conforms to the definition of a
+// wildcard subdomain in DNS (RFC 1034 section 4.3.3).
+func IsWildcardDNS1123Subdomain(value string) []string {
+	wildcardDNS1123SubdomainRegexp := regexp.MustCompile("^" + wildcardDNS1123SubdomainFmt + "$")
+
+	var errs []string
+	if len(value) > DNS1123SubdomainMaxLength {
+		errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
+	}
+	if !wildcardDNS1123SubdomainRegexp.MatchString(value) {
+		errs = append(errs, RegexError(wildcardDNS1123SubdomainErrMsg, wildcardDNS1123SubdomainFmt, "*.example.com"))
+	}
+	return errs
+}
+
+const cIdentifierFmt string = "[A-Za-z_][A-Za-z0-9_]*"
+const identifierErrMsg string = "a valid C identifier must start with alphabetic character or '_', followed by a string of alphanumeric characters or '_'"
+
+var cIdentifierRegexp = regexp.MustCompile("^" + cIdentifierFmt + "$")
+
+// IsCIdentifier tests for a string that conforms the definition of an identifier
+// in C. This checks the format, but not the length.
+func IsCIdentifier(value string) []string {
+	if !cIdentifierRegexp.MatchString(value) {
+		return []string{RegexError(identifierErrMsg, cIdentifierFmt, "my_name", "MY_NAME", "MyName")}
+	}
+	return nil
+}
+
+// IsValidPortNum tests that the argument is a valid, non-zero port number.
+func IsValidPortNum(port int) []string {
+	if 1 <= port && port <= 65535 {
+		return nil
+	}
+	return []string{InclusiveRangeError(1, 65535)}
+}
+
+// IsInRange tests that the argument is in an inclusive range.
+func IsInRange(value int, min int, max int) []string {
+	if value >= min && value <= max {
+		return nil
+	}
+	return []string{InclusiveRangeError(min, max)}
+}
+
+// Now in libcontainer UID/GID limits is 0 ~ 1<<31 - 1
+// TODO: once we have a type for UID/GID we should make these that type.
+const (
+	minUserID  = 0
+	maxUserID  = math.MaxInt32
+	minGroupID = 0
+	maxGroupID = math.MaxInt32
+)
+
+// IsValidGroupID tests that the argument is a valid Unix GID.
+func IsValidGroupID(gid int64) []string {
+	if minGroupID <= gid && gid <= maxGroupID {
+		return nil
+	}
+	return []string{InclusiveRangeError(minGroupID, maxGroupID)}
+}
+
+// IsValidUserID tests that the argument is a valid Unix UID.
+func IsValidUserID(uid int64) []string {
+	if minUserID <= uid && uid <= maxUserID {
+		return nil
+	}
+	return []string{InclusiveRangeError(minUserID, maxUserID)}
+}
+
+var portNameCharsetRegex = regexp.MustCompile("^[-a-z0-9]+$")
+var portNameOneLetterRegexp = regexp.MustCompile("[a-z]")
+
+// IsValidPortName check that the argument is valid syntax. It must be
+// non-empty and no more than 15 characters long. It may contain only [-a-z0-9]
+// and must contain at least one letter [a-z]. It must not start or end with a
+// hyphen, nor contain adjacent hyphens.
+//
+// Note: We only allow lower-case characters, even though RFC 6335 is case
+// insensitive.
+func IsValidPortName(port string) []string {
+	var errs []string
+	if len(port) > 15 {
+		errs = append(errs, MaxLenError(15))
+	}
+	if !portNameCharsetRegex.MatchString(port) {
+		errs = append(errs, "must contain only alpha-numeric characters (a-z, 0-9), and hyphens (-)")
+	}
+	if !portNameOneLetterRegexp.MatchString(port) {
+		errs = append(errs, "must contain at least one letter or number (a-z, 0-9)")
+	}
+	if strings.Contains(port, "--") {
+		errs = append(errs, "must not contain consecutive hyphens")
+	}
+	if len(port) > 0 && (port[0] == '-' || port[len(port)-1] == '-') {
+		errs = append(errs, "must not begin or end with a hyphen")
+	}
+	return errs
+}
+
+// IsValidIP tests that the argument is a valid IP address.
+func IsValidIP(value string) []string {
+	if net.ParseIP(value) == nil {
+		return []string{"must be a valid IP address, (e.g. 10.9.8.7)"}
+	}
+	return nil
+}
+
+// IsValidIPv4Address tests that the argument is a valid IPv4 address.
+func IsValidIPv4Address(fldPath *field.Path, value string) field.ErrorList {
+	var allErrors field.ErrorList
+	ip := net.ParseIP(value)
+	if ip == nil || ip.To4() == nil {
+		allErrors = append(allErrors, field.Invalid(fldPath, value, "must be a valid IPv4 address"))
+	}
+	return allErrors
+}
+
+// IsValidIPv6Address tests that the argument is a valid IPv6 address.
+func IsValidIPv6Address(fldPath *field.Path, value string) field.ErrorList {
+	var allErrors field.ErrorList
+	ip := net.ParseIP(value)
+	if ip == nil || ip.To4() != nil {
+		allErrors = append(allErrors, field.Invalid(fldPath, value, "must be a valid IPv6 address"))
+	}
+	return allErrors
+}
+
+const percentFmt string = "[0-9]+%"
+const percentErrMsg string = "a valid percent string must be a numeric string followed by an ending '%'"
+
+var percentRegexp = regexp.MustCompile("^" + percentFmt + "$")
+
+// IsValidPercent checks that string is in the form of a percentage
+func IsValidPercent(percent string) []string {
+	if !percentRegexp.MatchString(percent) {
+		return []string{RegexError(percentErrMsg, percentFmt, "1%", "93%")}
+	}
+	return nil
+}
+
+const httpHeaderNameFmt string = "[-A-Za-z0-9]+"
+const httpHeaderNameErrMsg string = "a valid HTTP header must consist of alphanumeric characters or '-'"
+
+var httpHeaderNameRegexp = regexp.MustCompile("^" + httpHeaderNameFmt + "$")
+
+// IsHTTPHeaderName checks that a string conforms to the Go HTTP library's
+// definition of a valid header field name (a stricter subset than RFC7230).
+func IsHTTPHeaderName(value string) []string {
+	if !httpHeaderNameRegexp.MatchString(value) {
+		return []string{RegexError(httpHeaderNameErrMsg, httpHeaderNameFmt, "X-Header-Name")}
+	}
+	return nil
+}
+
+const envVarNameFmt = "[-._a-zA-Z][-._a-zA-Z0-9]*"
+const envVarNameFmtErrMsg string = "a valid environment variable name must consist of alphabetic characters, digits, '_', '-', or '.', and must not start with a digit"
+
+var envVarNameRegexp = regexp.MustCompile("^" + envVarNameFmt + "$")
+
+// IsEnvVarName tests if a string is a valid environment variable name.
+func IsEnvVarName(value string) []string {
+	var errs []string
+	if !envVarNameRegexp.MatchString(value) {
+		errs = append(errs, RegexError(envVarNameFmtErrMsg, envVarNameFmt, "my.env-name", "MY_ENV.NAME", "MyEnvName1"))
+	}
+
+	errs = append(errs, hasChDirPrefix(value)...)
+	return errs
+}
+
+const configMapKeyFmt = `[-._a-zA-Z0-9]+`
+const configMapKeyErrMsg string = "a valid config key must consist of alphanumeric characters, '-', '_' or '.'"
+
+var configMapKeyRegexp = regexp.MustCompile("^" + configMapKeyFmt + "$")
+
+// IsConfigMapKey tests for a string that is a valid key for a ConfigMap or Secret
+func IsConfigMapKey(value string) []string {
+	var errs []string
+	if len(value) > DNS1123SubdomainMaxLength {
+		errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
+	}
+	if !configMapKeyRegexp.MatchString(value) {
+		errs = append(errs, RegexError(configMapKeyErrMsg, configMapKeyFmt, "key.name", "KEY_NAME", "key-name"))
+	}
+	errs = append(errs, hasChDirPrefix(value)...)
+	return errs
+}
+
+// MaxLenError returns a string explanation of a "string too long" validation
+// failure.
+func MaxLenError(length int) string {
+	return fmt.Sprintf("must be no more than %d characters", length)
+}
+
+// RegexError returns a string explanation of a regex validation failure.
+func RegexError(msg string, fmt string, examples ...string) string {
+	if len(examples) == 0 {
+		return msg + " (regex used for validation is '" + fmt + "')"
+	}
+	msg += " (e.g. "
+	for i := range examples {
+		if i > 0 {
+			msg += " or "
+		}
+		msg += "'" + examples[i] + "', "
+	}
+	msg += "regex used for validation is '" + fmt + "')"
+	return msg
+}
+
+// EmptyError returns a string explanation of a "must not be empty" validation
+// failure.
+func EmptyError() string {
+	return "must be non-empty"
+}
+
+func prefixEach(msgs []string, prefix string) []string {
+	for i := range msgs {
+		msgs[i] = prefix + msgs[i]
+	}
+	return msgs
+}
+
+// InclusiveRangeError returns a string explanation of a numeric "must be
+// between" validation failure.
+func InclusiveRangeError(lo, hi int) string {
+	return fmt.Sprintf(`must be between %d and %d, inclusive`, lo, hi)
+}
+
+func hasChDirPrefix(value string) []string {
+	var errs []string
+	switch {
+	case value == ".":
+		errs = append(errs, `must not be '.'`)
+	case value == "..":
+		errs = append(errs, `must not be '..'`)
+	case strings.HasPrefix(value, ".."):
+		errs = append(errs, `must not start with '..'`)
+	}
+	return errs
+}
+
+// IsValidSocketAddr checks that string represents a valid socket address
+// as defined in RFC 789. (e.g 0.0.0.0:10254 or [::]:10254))
+func IsValidSocketAddr(value string) []string {
+	var errs []string
+	ip, port, err := net.SplitHostPort(value)
+	if err != nil {
+		errs = append(errs, "must be a valid socket address format, (e.g. 0.0.0.0:10254 or [::]:10254)")
+		return errs
+	}
+	portInt, _ := strconv.Atoi(port)
+	errs = append(errs, IsValidPortNum(portInt)...)
+	errs = append(errs, IsValidIP(ip)...)
+	return errs
+}