Revert "Add shared content label to namespaces"

This reverts commit e692a01926.

Signed-off-by: Cody Roseborough <cdr@amazon.com>

metadata/buckets.go

@@ -115,7 +115,6 @@
 package metadata
 
 import (
-	"github.com/containerd/containerd/labels"
 	digest "github.com/opencontainers/go-digest"
 	bolt "go.etcd.io/bbolt"
 )
@@ -183,45 +182,6 @@ func createBucketIfNotExists(tx *bolt.Tx, keys ...[]byte) (*bolt.Bucket, error)
 	return bkt, nil
 }
 
-func namespacesBucketPath() []byte {
-	return bucketKeyVersion
-}
-
-func getNamespacesBucket(tx *bolt.Tx) *bolt.Bucket {
-	return getBucket(tx, namespacesBucketPath())
-}
-
-// Given a namespace string and a bolt transaction
-// return true if the ns has the shared label in it.
-func hasSharedLabel(tx *bolt.Tx, ns string) bool {
-	labelsBkt := getNamespaceLabelsBucket(tx, ns)
-	if labelsBkt == nil {
-		return false
-	}
-	cur := labelsBkt.Cursor()
-	for k, v := cur.First(); k != nil; k, v = cur.Next() {
-		if string(k) == labels.LabelSharedNamespace && string(v) == "true" {
-			return true
-		}
-	}
-	return false
-}
-
-func getShareableBucket(tx *bolt.Tx, dgst digest.Digest) *bolt.Bucket {
-	var bkt *bolt.Bucket
-	nsbkt := getNamespacesBucket(tx)
-	cur := nsbkt.Cursor()
-	for k, _ := cur.First(); k != nil; k, _ = cur.Next() {
-		// If this bucket has shared label
-		// get the bucket and return it.
-		if hasSharedLabel(tx, string(k)) {
-			bkt = getBlobBucket(tx, string(k), dgst)
-			break
-		}
-	}
-	return bkt
-}
-
 func namespaceLabelsBucketPath(namespace string) [][]byte {
 	return [][]byte{bucketKeyVersion, []byte(namespace), bucketKeyObjectLabels}
 }