Add support for label storage in local content store

Allows running tests which require labels on the content store

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

content/local/store_test.go

@@ -14,6 +14,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"runtime"
+	"sync"
 	"testing"
 	"time"
 
@@ -23,9 +24,55 @@ import (
 	"github.com/opencontainers/go-digest"
 )
 
+type memoryLabelStore struct {
+	l      sync.Mutex
+	labels map[digest.Digest]map[string]string
+}
+
+func newMemoryLabelStore() LabelStore {
+	return &memoryLabelStore{
+		labels: map[digest.Digest]map[string]string{},
+	}
+}
+
+func (mls *memoryLabelStore) Get(d digest.Digest) (map[string]string, error) {
+	mls.l.Lock()
+	labels := mls.labels[d]
+	mls.l.Unlock()
+
+	return labels, nil
+}
+
+func (mls *memoryLabelStore) Set(d digest.Digest, labels map[string]string) error {
+	mls.l.Lock()
+	mls.labels[d] = labels
+	mls.l.Unlock()
+
+	return nil
+}
+
+func (mls *memoryLabelStore) Update(d digest.Digest, update map[string]string) (map[string]string, error) {
+	mls.l.Lock()
+	labels, ok := mls.labels[d]
+	if !ok {
+		labels = map[string]string{}
+	}
+	for k, v := range update {
+		if v == "" {
+			delete(labels, k)
+		} else {
+			labels[k] = v
+		}
+	}
+	mls.labels[d] = labels
+	mls.l.Unlock()
+
+	return labels, nil
+}
+
 func TestContent(t *testing.T) {
 	testsuite.ContentSuite(t, "fs", func(ctx context.Context, root string) (content.Store, func() error, error) {
-		cs, err := NewStore(root)
+		cs, err := NewLabeledStore(root, newMemoryLabelStore())
 		if err != nil {
 			return nil, nil, err
 		}