add fieldSelector for kubectl get

pkg/kubectl/resource/builder.go

@@ -54,6 +54,7 @@ type Builder struct {
 	dir    bool
 
 	labelSelector        *string
+	fieldSelector        *string
 	selectAll            bool
 	includeUninitialized bool
 	limitChunks          int64
@@ -296,6 +297,22 @@ func (b *Builder) LabelSelector(selector string) *Builder {
 	return b
 }
 
+// FieldSelectorParam defines a selector that should be applied to the object types to load.
+// This will not affect files loaded from disk or URL. If the parameter is empty it is
+// a no-op - to select all resources.
+func (b *Builder) FieldSelectorParam(s string) *Builder {
+	s = strings.TrimSpace(s)
+	if len(s) == 0 {
+		return b
+	}
+	if b.selectAll {
+		b.errs = append(b.errs, fmt.Errorf("found non-empty field selector %q with previously set 'all' parameter. ", s))
+		return b
+	}
+	b.fieldSelector = &s
+	return b
+}
+
 // ExportParam accepts the export boolean for these resources
 func (b *Builder) ExportParam(export bool) *Builder {
 	b.export = export
@@ -350,7 +367,7 @@ func (b *Builder) RequestChunksOf(chunkSize int64) *Builder {
 
 // SelectEverythingParam
 func (b *Builder) SelectAllParam(selectAll bool) *Builder {
-	if selectAll && b.labelSelector != nil {
+	if selectAll && (b.labelSelector != nil || b.fieldSelector != nil) {
 		b.errs = append(b.errs, fmt.Errorf("setting 'all' parameter but found a non empty selector. "))
 		return b
 	}
@@ -595,7 +612,7 @@ func (b *Builder) visitorResult() *Result {
 	}
 
 	// visit selectors
-	if b.labelSelector != nil {
+	if b.labelSelector != nil || b.fieldSelector != nil {
 		return b.visitBySelector()
 	}
 
@@ -635,6 +652,14 @@ func (b *Builder) visitBySelector() *Result {
 		return result
 	}
 
+	var labelSelector, fieldSelector string
+	if b.labelSelector != nil {
+		labelSelector = *b.labelSelector
+	}
+	if b.fieldSelector != nil {
+		fieldSelector = *b.fieldSelector
+	}
+
 	visitors := []Visitor{}
 	for _, mapping := range mappings {
 		client, err := b.mapper.ClientForMapping(mapping)
@@ -646,7 +671,7 @@ func (b *Builder) visitBySelector() *Result {
 		if mapping.Scope.Name() != meta.RESTScopeNameNamespace {
 			selectorNamespace = ""
 		}
-		visitors = append(visitors, NewSelector(client, mapping, selectorNamespace, *b.labelSelector, b.export, b.includeUninitialized, b.limitChunks))
+		visitors = append(visitors, NewSelector(client, mapping, selectorNamespace, labelSelector, fieldSelector, b.export, b.includeUninitialized, b.limitChunks))
 	}
 	if b.continueOnError {
 		result.visitor = EagerVisitorList(visitors)