add methods to allow selection and exclusion of resources by gvk

go/fn/examples/example_filter_GVK_test.go

@@ -35,10 +35,9 @@ func updateReplicas(rl *fn.ResourceList) (bool, error) {
 	}
 	var replicas int
 	rl.FunctionConfig.GetOrDie(&replicas, "replicas")
-	for i, obj := range rl.Items {
-		if obj.IsGVK("apps/v1", "Deployment") {
-			rl.Items[i].SetOrDie(replicas, "spec", "replicas")
-		}
+	deployments := rl.Items.Where(fn.IsGVK("apps/v1", "Deployment"))
+	for i := range deployments {
+		rl.Items[i].SetOrDie(replicas, "spec", "replicas")
 	}
 	return true, nil
 }

go/fn/examples/example_select_exclude_test.go

@@ -0,0 +1,23 @@
+package example
+
+import (
+	"os"
+
+	"github.com/GoogleContainerTools/kpt-functions-sdk/go/fn"
+)
+
+// This example implements a function that selectively includes or excludes some resources.
+
+func Example_selectExclude() {
+	if err := fn.AsMain(fn.ResourceListProcessorFunc(selectResources)); err != nil {
+		os.Exit(1)
+	}
+}
+
+// selectResources keeps all resources with the GVK apps/v1 Deployment that do
+// NOT have the label foo=bar, and removes the rest.
+func selectResources(rl *fn.ResourceList) (bool, error) {
+	rl.Items = rl.Items.Where(fn.IsGVK("apps/v1", "Deployment")).
+		WhereNot(fn.HasLabels(map[string]string{"foo": "bar"}))
+	return true, nil
+}

go/fn/examples/go.mod

@@ -8,36 +8,41 @@ require (
 	github.com/GoogleContainerTools/kpt-functions-sdk/go/fn v0.0.0
 	k8s.io/api v0.24.0
 	k8s.io/apimachinery v0.24.0
-	sigs.k8s.io/kustomize/kyaml v0.13.6
+	sigs.k8s.io/kustomize/kyaml v0.13.7-0.20220418212550-9d5491c2e20c
 )
 
 require (
 	github.com/PuerkitoBio/purell v1.1.1 // indirect
 	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/go-errors/errors v1.0.1 // indirect
+	github.com/go-errors/errors v1.4.2 // indirect
 	github.com/go-logr/logr v1.2.0 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
-	github.com/go-openapi/jsonreference v0.19.3 // indirect
-	github.com/go-openapi/swag v0.19.5 // indirect
+	github.com/go-openapi/jsonreference v0.19.6 // indirect
+	github.com/go-openapi/swag v0.21.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
 	github.com/google/gofuzz v1.1.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mailru/easyjson v0.7.0 // indirect
+	github.com/kr/pretty v0.2.1 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.7.0 // indirect
-	github.com/xlab/treeprint v0.0.0-20181112141820-a009c3971eca // indirect
-	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
+	github.com/stretchr/testify v1.7.1 // indirect
+	github.com/xlab/treeprint v1.1.0 // indirect
+	golang.org/x/net v0.0.0-20220412020605-290c469a71a5 // indirect
 	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 	k8s.io/klog/v2 v2.60.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20220328201542-3ee0da9b0b42 // indirect
+	k8s.io/kube-openapi v0.0.0-20220401212409-b28bf2818661 // indirect
 	k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 // indirect
 	sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2 // indirect
 	sigs.k8s.io/structured-merge-diff/v4 v4.2.1 // indirect

go/fn/go.mod

@@ -3,35 +3,39 @@ module github.com/GoogleContainerTools/kpt-functions-sdk/go/fn
 go 1.17
 
 require (
-	github.com/google/go-cmp v0.5.5
+	github.com/google/go-cmp v0.5.7
+	github.com/stretchr/testify v1.7.1
 	// We must not include any core k8s modules (e.g. k8s.io/apimachinery) in
 	// the dependencies, depending on them will likely to cause version skew for
 	// consumers. The dependencies for tests and examples should be isolated.
 	k8s.io/klog/v2 v2.60.1
-	sigs.k8s.io/kustomize/kyaml v0.13.6
+	sigs.k8s.io/kustomize/kyaml v0.13.7-0.20220418212550-9d5491c2e20c
 )
 
 require (
 	github.com/PuerkitoBio/purell v1.1.1 // indirect
 	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/go-errors/errors v1.0.1 // indirect
+	github.com/go-errors/errors v1.4.2 // indirect
 	github.com/go-logr/logr v1.2.0 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
-	github.com/go-openapi/jsonreference v0.19.3 // indirect
-	github.com/go-openapi/swag v0.19.5 // indirect
-	github.com/kr/text v0.2.0 // indirect
-	github.com/mailru/easyjson v0.7.0 // indirect
+	github.com/go-openapi/jsonreference v0.19.6 // indirect
+	github.com/go-openapi/swag v0.21.1 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/testify v1.7.0 // indirect
-	github.com/xlab/treeprint v0.0.0-20181112141820-a009c3971eca // indirect
-	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
+	github.com/xlab/treeprint v1.1.0 // indirect
+	golang.org/x/net v0.0.0-20220412020605-290c469a71a5 // indirect
 	golang.org/x/text v0.3.7 // indirect
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	golang.org/x/xerrors v0.0.0-20220411194840-2f41105eb62f // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
-	k8s.io/kube-openapi v0.0.0-20220328201542-3ee0da9b0b42 // indirect
+	k8s.io/kube-openapi v0.0.0-20220401212409-b28bf2818661 // indirect
+	sigs.k8s.io/yaml v1.3.0 // indirect
 )