Expose the resource types in addition to the api group/version in templates

Ported #5842 to Helm v3

Signed-off-by: Matt Farina <matt@mattfarina.com>

Gopkg.toml

@@ -104,7 +104,6 @@
 
 [prune]
   go-tests = true
-  unused-packages = true
 
 [[constraint]]
   name = "github.com/xeipuuv/gojsonschema"

docs/chart_template_guide/builtin_objects.md

@@ -19,7 +19,7 @@ In the previous section, we use `{{.Release.Name}}` to insert the name of a rele
   - `Files.GetBytes` is a function for getting the contents of a file as an array of bytes instead of as a string. This is useful for things like images.
 - `Capabilities`: This provides information about what capabilities the Kubernetes cluster supports.
   - `Capabilities.APIVersions` is a set of versions.
-  - `Capabilities.APIVersions.Has $version` indicates whether a version (`batch/v1`) is enabled on the cluster.
+  - `Capabilities.APIVersions.Has $version` indicates whether a version (e.g., `batch/v1`) or resource (e.g., `apps/v1/Deployment`) is available on the cluster.
   - `Capabilities.Kube.Version` is the Kubernetes version.
   - `Capabilities.Kube` is a short form for Kubernetes version.
   - `Capabilities.Kube.Major` is the Kubernetes major version.

pkg/action/action.go

@@ -17,12 +17,12 @@ limitations under the License.
 package action
 
 import (
+	"path"
 	"regexp"
 	"time"
 
 	"github.com/pkg/errors"
 	"k8s.io/apimachinery/pkg/api/meta"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/discovery"
 	"k8s.io/client-go/rest"
 
@@ -131,21 +131,50 @@ func (c *Configuration) releaseContent(name string, version int) (*release.Relea
 }
 
 // GetVersionSet retrieves a set of available k8s API versions
-func GetVersionSet(client discovery.ServerGroupsInterface) (chartutil.VersionSet, error) {
-	groups, err := client.ServerGroups()
+func GetVersionSet(client discovery.ServerResourcesInterface) (chartutil.VersionSet, error) {
+	groups, resources, err := client.ServerGroupsAndResources()
 	if err != nil {
 		return chartutil.DefaultVersionSet, err
 	}
 
 	// FIXME: The Kubernetes test fixture for cli appears to always return nil
-	// for calls to Discovery().ServerGroups(). So in this case, we return
-	// the default API list. This is also a safe value to return in any other
-	// odd-ball case.
-	if groups.Size() == 0 {
+	// for calls to Discovery().ServerGroupsAndResources(). So in this case, we
+	// return the default API list. This is also a safe value to return in any
+	// other odd-ball case.
+	if len(groups) == 0 && len(resources) == 0 {
 		return chartutil.DefaultVersionSet, nil
 	}
 
-	versions := metav1.ExtractGroupVersions(groups)
+	versionMap := make(map[string]interface{})
+	versions := []string{}
+
+	// Extract the groups
+	for _, g := range groups {
+		for _, gv := range g.Versions {
+			versionMap[gv.GroupVersion] = struct{}{}
+		}
+	}
+
+	// Extract the resources
+	var id string
+	var ok bool
+	for _, r := range resources {
+		for _, rl := range r.APIResources {
+
+			// A Kind at a GroupVersion can show up more than once. We only want
+			// it displayed once in the final output.
+			id = path.Join(r.GroupVersion, rl.Kind)
+			if _, ok = versionMap[id]; !ok {
+				versionMap[id] = struct{}{}
+			}
+		}
+	}
+
+	// Convert to a form that NewVersionSet can use
+	for k := range versionMap {
+		versions = append(versions, k)
+	}
+
 	return chartutil.VersionSet(versions), nil
 }
 

pkg/action/action_test.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/pkg/errors"
+	fakeclientset "k8s.io/client-go/kubernetes/fake"
 
 	"helm.sh/helm/pkg/chart"
 	"helm.sh/helm/pkg/chartutil"
@@ -187,3 +188,19 @@ type hookFailingKubeClient struct {
 func (h *hookFailingKubeClient) WatchUntilReady(r io.Reader, timeout time.Duration) error {
 	return errors.New("Failed watch")
 }
+
+func TestGetVersionSet(t *testing.T) {
+	client := fakeclientset.NewSimpleClientset()
+
+	vs, err := GetVersionSet(client.Discovery())
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !vs.Has("v1") {
+		t.Errorf("Expected supported versions to at least include v1.")
+	}
+	if vs.Has("nosuchversion/v1") {
+		t.Error("Non-existent version is reported found.")
+	}
+}