internal/downward: add support for (optional) pod name

Signed-off-by: Andrew Keesler <akeesler@vmware.com>

internal/downward/downward.go

@@ -13,6 +13,8 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+
+	"go.pinniped.dev/internal/plog"
 )
 
 // PodInfo contains pod metadata about the current pod.
@@ -20,6 +22,9 @@ type PodInfo struct {
 	// Namespace where the current pod is running.
 	Namespace string
 
+	// Name of the current pod.
+	Name string
+
 	// Labels of the current pod.
 	Labels map[string]string
 }
@@ -33,6 +38,13 @@ func Load(directory string) (*PodInfo, error) {
 	}
 	result.Namespace = strings.TrimSpace(string(ns))
 
+	name, err := ioutil.ReadFile(filepath.Join(directory, "name"))
+	if err != nil {
+		plog.Warning("could not read 'name' downward API file")
+	} else {
+		result.Name = strings.TrimSpace(string(name))
+	}
+
 	labels, err := ioutil.ReadFile(filepath.Join(directory, "labels"))
 	if err != nil {
 		return nil, fmt.Errorf("could not load labels: %w", err)

internal/downward/downward_test.go

@@ -35,6 +35,15 @@ func TestLoad(t *testing.T) {
 		{
 			name:     "valid",
 			inputDir: "./testdata/valid",
+			want: &PodInfo{
+				Namespace: "test-namespace",
+				Name:      "test-name",
+				Labels:    map[string]string{"foo": "bar", "bat": "baz"},
+			},
+		},
+		{
+			name:     "valid without name",
+			inputDir: "./testdata/validwithoutname",
 			want: &PodInfo{
 				Namespace: "test-namespace",
 				Labels:    map[string]string{"foo": "bar", "bat": "baz"},

internal/downward/testdata/valid/name

@@ -0,0 +1 @@
+test-name

internal/downward/testdata/validwithoutname/labels

@@ -0,0 +1,2 @@
+foo="bar"
+bat="baz"

internal/downward/testdata/validwithoutname/namespace

@@ -0,0 +1 @@
+test-namespace