Merge pull request #1378 from cpuguy83/container_store_extra_data

Add `Container` field to store client-defined data

api/next.pb.txt

@@ -185,6 +185,17 @@ file {
       }
       json_name: "updatedAt"
     }
+    field {
+      name: "extensions"
+      number: 10
+      label: LABEL_REPEATED
+      type: TYPE_MESSAGE
+      type_name: ".containerd.services.containers.v1.Container.ExtensionsEntry"
+      options {
+        65001: 0
+      }
+      json_name: "extensions"
+    }
     nested_type {
       name: "LabelsEntry"
       field {
@@ -223,6 +234,27 @@ file {
         json_name: "options"
       }
     }
+    nested_type {
+      name: "ExtensionsEntry"
+      field {
+        name: "key"
+        number: 1
+        label: LABEL_OPTIONAL
+        type: TYPE_STRING
+        json_name: "key"
+      }
+      field {
+        name: "value"
+        number: 2
+        label: LABEL_OPTIONAL
+        type: TYPE_MESSAGE
+        type_name: ".google.protobuf.Any"
+        json_name: "value"
+      }
+      options {
+        map_entry: true
+      }
+    }
   }
   message_type {
     name: "GetContainerRequest"

api/services/containers/v1/containers.pb.go

@@ -94,6 +94,16 @@ type Container struct {
 	CreatedAt time.Time `protobuf:"bytes,8,opt,name=created_at,json=createdAt,stdtime" json:"created_at"`
 	// UpdatedAt is the last time the container was mutated.
 	UpdatedAt time.Time `protobuf:"bytes,9,opt,name=updated_at,json=updatedAt,stdtime" json:"updated_at"`
+	// Extensions allow clients to provide zero or more blobs that are directly
+	// associated with the container. One may provide protobuf, json, or other
+	// encoding formats. The primary use of this is to further decorate the
+	// container object with fields that may be specific to a client integration.
+	//
+	// The key portion of this map should identify a "name" for the extension
+	// that should be unique against other extensions. When updating extension
+	// data, one should only update the specified extension using field paths
+	// to select a specific map key.
+	Extensions map[string]google_protobuf1.Any `protobuf:"bytes,10,rep,name=extensions" json:"extensions" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value"`
 }
 
 func (m *Container) Reset()                    { *m = Container{} }
@@ -518,6 +528,32 @@ func (m *Container) MarshalTo(dAtA []byte) (int, error) {
 		return 0, err
 	}
 	i += n4
+	if len(m.Extensions) > 0 {
+		for k, _ := range m.Extensions {
+			dAtA[i] = 0x52
+			i++
+			v := m.Extensions[k]
+			msgSize := 0
+			if (&v) != nil {
+				msgSize = (&v).Size()
+				msgSize += 1 + sovContainers(uint64(msgSize))
+			}
+			mapSize := 1 + len(k) + sovContainers(uint64(len(k))) + msgSize
+			i = encodeVarintContainers(dAtA, i, uint64(mapSize))
+			dAtA[i] = 0xa
+			i++
+			i = encodeVarintContainers(dAtA, i, uint64(len(k)))
+			i += copy(dAtA[i:], k)
+			dAtA[i] = 0x12
+			i++
+			i = encodeVarintContainers(dAtA, i, uint64((&v).Size()))
+			n5, err := (&v).MarshalTo(dAtA[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n5
+		}
+	}
 	return i, nil
 }
 
@@ -546,11 +582,11 @@ func (m *Container_Runtime) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintContainers(dAtA, i, uint64(m.Options.Size()))
-		n5, err := m.Options.MarshalTo(dAtA[i:])
+		n6, err := m.Options.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n5
+		i += n6
 	}
 	return i, nil
 }
@@ -597,11 +633,11 @@ func (m *GetContainerResponse) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintContainers(dAtA, i, uint64(m.Container.Size()))
-	n6, err := m.Container.MarshalTo(dAtA[i:])
+	n7, err := m.Container.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n6
+	i += n7
 	return i, nil
 }
 
@@ -686,11 +722,11 @@ func (m *CreateContainerRequest) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintContainers(dAtA, i, uint64(m.Container.Size()))
-	n7, err := m.Container.MarshalTo(dAtA[i:])
+	n8, err := m.Container.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n7
+	i += n8
 	return i, nil
 }
 
@@ -712,11 +748,11 @@ func (m *CreateContainerResponse) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintContainers(dAtA, i, uint64(m.Container.Size()))
-	n8, err := m.Container.MarshalTo(dAtA[i:])
+	n9, err := m.Container.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n8
+	i += n9
 	return i, nil
 }
 
@@ -738,20 +774,20 @@ func (m *UpdateContainerRequest) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintContainers(dAtA, i, uint64(m.Container.Size()))
-	n9, err := m.Container.MarshalTo(dAtA[i:])
+	n10, err := m.Container.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n9
+	i += n10
 	if m.UpdateMask != nil {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintContainers(dAtA, i, uint64(m.UpdateMask.Size()))
-		n10, err := m.UpdateMask.MarshalTo(dAtA[i:])
+		n11, err := m.UpdateMask.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n10
+		i += n11
 	}
 	return i, nil
 }
@@ -774,11 +810,11 @@ func (m *UpdateContainerResponse) MarshalTo(dAtA []byte) (int, error) {
 	dAtA[i] = 0xa
 	i++
 	i = encodeVarintContainers(dAtA, i, uint64(m.Container.Size()))
-	n11, err := m.Container.MarshalTo(dAtA[i:])
+	n12, err := m.Container.MarshalTo(dAtA[i:])
 	if err != nil {
 		return 0, err
 	}
-	i += n11
+	i += n12
 	return i, nil
 }
 
@@ -872,6 +908,15 @@ func (m *Container) Size() (n int) {
 	n += 1 + l + sovContainers(uint64(l))
 	l = github_com_gogo_protobuf_types.SizeOfStdTime(m.UpdatedAt)
 	n += 1 + l + sovContainers(uint64(l))
+	if len(m.Extensions) > 0 {
+		for k, v := range m.Extensions {
+			_ = k
+			_ = v
+			l = v.Size()
+			mapEntrySize := 1 + len(k) + sovContainers(uint64(len(k))) + 1 + l + sovContainers(uint64(l))
+			n += mapEntrySize + 1 + sovContainers(uint64(mapEntrySize))
+		}
+	}
 	return n
 }
 
@@ -1004,6 +1049,16 @@ func (this *Container) String() string {
 		mapStringForLabels += fmt.Sprintf("%v: %v,", k, this.Labels[k])
 	}
 	mapStringForLabels += "}"
+	keysForExtensions := make([]string, 0, len(this.Extensions))
+	for k, _ := range this.Extensions {
+		keysForExtensions = append(keysForExtensions, k)
+	}
+	github_com_gogo_protobuf_sortkeys.Strings(keysForExtensions)
+	mapStringForExtensions := "map[string]google_protobuf1.Any{"
+	for _, k := range keysForExtensions {
+		mapStringForExtensions += fmt.Sprintf("%v: %v,", k, this.Extensions[k])
+	}
+	mapStringForExtensions += "}"
 	s := strings.Join([]string{`&Container{`,
 		`ID:` + fmt.Sprintf("%v", this.ID) + `,`,
 		`Labels:` + mapStringForLabels + `,`,
@@ -1014,6 +1069,7 @@ func (this *Container) String() string {
 		`SnapshotKey:` + fmt.Sprintf("%v", this.SnapshotKey) + `,`,
 		`CreatedAt:` + strings.Replace(strings.Replace(this.CreatedAt.String(), "Timestamp", "google_protobuf4.Timestamp", 1), `&`, ``, 1) + `,`,
 		`UpdatedAt:` + strings.Replace(strings.Replace(this.UpdatedAt.String(), "Timestamp", "google_protobuf4.Timestamp", 1), `&`, ``, 1) + `,`,
+		`Extensions:` + mapStringForExtensions + `,`,
 		`}`,
 	}, "")
 	return s
@@ -1515,6 +1571,127 @@ func (m *Container) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 10:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Extensions", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowContainers
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthContainers
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			var keykey uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowContainers
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				keykey |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			var stringLenmapkey uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowContainers
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLenmapkey |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLenmapkey := int(stringLenmapkey)
+			if intStringLenmapkey < 0 {
+				return ErrInvalidLengthContainers
+			}
+			postStringIndexmapkey := iNdEx + intStringLenmapkey
+			if postStringIndexmapkey > l {
+				return io.ErrUnexpectedEOF
+			}
+			mapkey := string(dAtA[iNdEx:postStringIndexmapkey])
+			iNdEx = postStringIndexmapkey
+			if m.Extensions == nil {
+				m.Extensions = make(map[string]google_protobuf1.Any)
+			}
+			if iNdEx < postIndex {
+				var valuekey uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowContainers
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					valuekey |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				var mapmsglen int
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowContainers
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					mapmsglen |= (int(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				if mapmsglen < 0 {
+					return ErrInvalidLengthContainers
+				}
+				postmsgIndex := iNdEx + mapmsglen
+				if mapmsglen < 0 {
+					return ErrInvalidLengthContainers
+				}
+				if postmsgIndex > l {
+					return io.ErrUnexpectedEOF
+				}
+				mapvalue := &google_protobuf1.Any{}
+				if err := mapvalue.Unmarshal(dAtA[iNdEx:postmsgIndex]); err != nil {
+					return err
+				}
+				iNdEx = postmsgIndex
+				m.Extensions[mapkey] = *mapvalue
+			} else {
+				var mapvalue google_protobuf1.Any
+				m.Extensions[mapkey] = mapvalue
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipContainers(dAtA[iNdEx:])
@@ -2509,51 +2686,54 @@ func init() {
 }
 
 var fileDescriptorContainers = []byte{
-	// 730 bytes of a gzipped FileDescriptorProto
+	// 776 bytes of a gzipped FileDescriptorProto
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-	0xfe, 0x3d, 0x62, 0x75, 0xa9, 0x96, 0x08, 0xf4, 0x97, 0xc9, 0x66, 0x62, 0x5d, 0xd1, 0x8f, 0x20,
+	0x6f, 0xda, 0xa3, 0xb9, 0xbc, 0xdc, 0x19, 0xc1, 0x79, 0xe3, 0x1a, 0x29, 0xb7, 0x8c, 0x12, 0x61,
-	0x1d, 0xea, 0x88, 0x10, 0xa8, 0x0e, 0xb1, 0x69, 0x88, 0x93, 0x31, 0x32, 0x20, 0xed, 0x7a, 0xdc,
+	0x95, 0xd6, 0x20, 0x17, 0xe9, 0x2c, 0xf9, 0x07, 0x92, 0xae, 0x2d, 0x7c, 0x78, 0x14, 0xf7, 0xe8,
-	0x74, 0x1d, 0x26, 0xa1, 0xd3, 0x54, 0x8d, 0x8a, 0xca, 0x4f, 0xe0, 0xde, 0x01, 0xe5, 0xd7, 0x77,
+	0xf6, 0xb8, 0xaf, 0xea, 0x3d, 0x14, 0x13, 0x5e, 0x8f, 0x79, 0xb0, 0x9e, 0x58, 0x15, 0xa4, 0x03,
-	0x84, 0xe9, 0xe7, 0x2e, 0x65, 0x7c, 0x9a, 0xd3, 0xca, 0x67, 0x90, 0xbb, 0x59, 0xce, 0x3c, 0xd7,
+	0xc8, 0xf8, 0xbd, 0x22, 0x04, 0x52, 0xa6, 0x6a, 0xa0, 0x8f, 0xe3, 0x67, 0x22, 0x43, 0xc6, 0xb2,
-	0x61, 0x14, 0x1d, 0x43, 0xe6, 0xfa, 0xd6, 0x25, 0x2c, 0x5b, 0x7b, 0x3c, 0x8f, 0x37, 0xea, 0xaa,
+	0x19, 0x97, 0x9e, 0xf8, 0x49, 0xe7, 0x82, 0x24, 0xe9, 0x19, 0xfc, 0x3d, 0x26, 0x37, 0x46, 0xcd,
-	0x90, 0x09, 0xc7, 0x4d, 0xca, 0x6b, 0x70, 0xff, 0xd0, 0x64, 0xf1, 0x28, 0x16, 0x51, 0xd3, 0x20,
+	0xad, 0xa8, 0x9a, 0x69, 0x94, 0xa1, 0xc6, 0xca, 0x1d, 0xf8, 0x77, 0x0f, 0xd9, 0xc8, 0x10, 0x05,
-	0x7d, 0x6a, 0x5a, 0x9c, 0xfa, 0x4c, 0x53, 0x4a, 0xc9, 0x4a, 0x06, 0x47, 0x69, 0xd9, 0x82, 0xfc,
+	0xdf, 0xf6, 0x90, 0xb2, 0x69, 0x2b, 0x52, 0x39, 0x81, 0xfc, 0xe5, 0x74, 0x6a, 0x5b, 0x26, 0x45,
-	0x28, 0x24, 0xa4, 0x87, 0x01, 0xe2, 0xc1, 0x12, 0x76, 0x3b, 0x7e, 0x43, 0x5d, 0xca, 0x9f, 0x20,
+	0x72, 0x08, 0xd9, 0x91, 0xc5, 0x1c, 0x96, 0xab, 0xdf, 0x9e, 0xa7, 0x11, 0xbe, 0xf1, 0x21, 0x49,
-	0xbf, 0x23, 0x5d, 0x31, 0x26, 0xde, 0xff, 0x17, 0xa3, 0x03, 0x0f, 0xc6, 0x66, 0x2d, 0x4c, 0xf9,
+	0x65, 0x05, 0xfe, 0xdb, 0xd7, 0x68, 0x58, 0x8a, 0x06, 0xd2, 0x44, 0xc8, 0x1c, 0x6b, 0x3a, 0x43,
-	0x1f, 0x0a, 0xe4, 0xdf, 0x49, 0xab, 0x2e, 0xfe, 0xc9, 0xd0, 0x16, 0x64, 0x83, 0xb5, 0x90, 0xaf,
+	0x87, 0x8a, 0x42, 0x39, 0x59, 0xcd, 0x2a, 0x41, 0x58, 0xd1, 0xa1, 0x30, 0x0e, 0xf1, 0xe5, 0x29,
-	0xc5, 0xd0, 0xb3, 0xe3, 0xfb, 0xb4, 0x2f, 0xde, 0x9c, 0x47, 0x84, 0x75, 0x70, 0xb8, 0x7d, 0x22,
+	0x00, 0x61, 0x61, 0x0e, 0xbb, 0x9a, 0xbe, 0x08, 0x4b, 0xe5, 0x0d, 0x14, 0xb6, 0xf8, 0x38, 0x4f,
-	0x16, 0xb2, 0x8c, 0x11, 0x5d, 0x98, 0x2c, 0x4f, 0x21, 0xbf, 0x4b, 0x2d, 0x3a, 0x41, 0x95, 0x29,
+	0x98, 0xf7, 0xe7, 0xcd, 0xe8, 0xc2, 0xff, 0x13, 0xb5, 0xae, 0xcd, 0xf9, 0x2f, 0x02, 0x14, 0x5e,
-	0xcb, 0x52, 0xbb, 0x54, 0x01, 0x62, 0x33, 0xa2, 0x1e, 0x24, 0x0f, 0x28, 0x47, 0x2f, 0x66, 0xa0,
+	0xf0, 0x1d, 0xbb, 0xfe, 0x6f, 0x46, 0x36, 0x20, 0xe7, 0xed, 0x33, 0x7f, 0xcf, 0xfd, 0xa9, 0x9d,
-	0x31, 0x61, 0x25, 0xf5, 0x97, 0x73, 0xe3, 0x42, 0x29, 0xbe, 0x80, 0x2a, 0xd6, 0x02, 0xcd, 0xf2,
+	0x7c, 0x08, 0x76, 0xdd, 0x27, 0xff, 0x40, 0xa5, 0x5d, 0xc5, 0x7f, 0x36, 0xdc, 0xb3, 0x6b, 0xcb,
-	0xaf, 0x30, 0x71, 0xe5, 0xf4, 0x8d, 0x5b, 0x20, 0xc3, 0xe1, 0x5f, 0x21, 0x15, 0x38, 0x17, 0xcd,
+	0x84, 0xd0, 0x6b, 0xb3, 0xe5, 0x2e, 0x14, 0xb6, 0x51, 0xc7, 0x18, 0x57, 0xa6, 0x2c, 0x4b, 0xfd,
-	0xd2, 0x64, 0xf2, 0x42, 0xe9, 0x9b, 0xb7, 0x81, 0xc6, 0x04, 0x02, 0x8f, 0xcc, 0x44, 0x60, 0xb2,
+	0x3c, 0x05, 0x10, 0x0e, 0x23, 0xe9, 0x43, 0x72, 0x0f, 0x19, 0x79, 0x30, 0x83, 0x8c, 0x98, 0x95,
-	0xef, 0x67, 0x22, 0x30, 0xcd, 0x89, 0x1f, 0x20, 0x15, 0xf8, 0x66, 0x26, 0x02, 0x93, 0x2d, 0xa6,
+	0x94, 0x1e, 0xce, 0x8d, 0xf3, 0xad, 0x78, 0x0f, 0x29, 0x77, 0x2d, 0xc8, 0x2c, 0x3f, 0x67, 0xb1,
-	0xe7, 0xc7, 0x36, 0x62, 0x4f, 0x7c, 0x68, 0xd4, 0x3f, 0x9e, 0x5f, 0x15, 0x96, 0x7e, 0x5d, 0x15,
+	0x2b, 0x27, 0xad, 0x5d, 0x01, 0xe9, 0x17, 0xff, 0x00, 0x69, 0x6f, 0x72, 0xc9, 0x2c, 0x24, 0xf1,
-	0x96, 0xbe, 0x0d, 0x0a, 0xca, 0xf9, 0xa0, 0xa0, 0xfc, 0x1c, 0x14, 0x94, 0xcb, 0x41, 0x41, 0x79,
+	0x0b, 0x25, 0xad, 0x5f, 0x05, 0x1a, 0x0a, 0xf0, 0x66, 0x64, 0x26, 0x01, 0xf1, 0x73, 0x3f, 0x93,
-	0xbf, 0xff, 0x0f, 0xdf, 0x4e, 0x5b, 0x71, 0xd6, 0x48, 0xc9, 0x89, 0xcf, 0xfe, 0x04, 0x00, 0x00,
+	0x80, 0x69, 0x93, 0xf8, 0x0a, 0xd2, 0xde, 0xdc, 0xcc, 0x24, 0x20, 0x7e, 0xc4, 0xa4, 0xc2, 0xc4,
-	0xff, 0xff, 0x7e, 0x6d, 0xca, 0xbd, 0x8c, 0x09, 0x00, 0x00,
+	0x46, 0xec, 0xb8, 0xff, 0x90, 0x1a, 0xaf, 0x4f, 0x2f, 0x8a, 0x0b, 0xdf, 0x2e, 0x8a, 0x0b, 0x1f,
+	0x87, 0x45, 0xe1, 0x74, 0x58, 0x14, 0xbe, 0x0e, 0x8b, 0xc2, 0xf9, 0xb0, 0x28, 0xbc, 0xdc, 0xfd,
+	0x8d, 0x3f, 0x7d, 0x1b, 0x61, 0xd4, 0x4c, 0xf3, 0x8a, 0xf7, 0x7e, 0x04, 0x00, 0x00, 0xff, 0xff,
+	0x17, 0x73, 0xba, 0x43, 0x45, 0x0a, 0x00, 0x00,
 }

api/services/containers/v1/containers.proto

@@ -84,6 +84,17 @@ message Container {
 
 	// UpdatedAt is the last time the container was mutated.
 	google.protobuf.Timestamp updated_at = 9 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
+
+	// Extensions allow clients to provide zero or more blobs that are directly
+	// associated with the container. One may provide protobuf, json, or other
+	// encoding formats. The primary use of this is to further decorate the
+	// container object with fields that may be specific to a client integration.
+	//
+	// The key portion of this map should identify a "name" for the extension
+	// that should be unique against other extensions. When updating extension
+	// data, one should only update the specified extension using field paths
+	// to select a specific map key.
+	map<string, google.protobuf.Any> extensions = 10 [(gogoproto.nullable) = false];
 }
 
 message GetContainerRequest {

container.go

@@ -12,6 +12,7 @@ import (
 	"github.com/containerd/containerd/containers"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/typeurl"
+	prototypes "github.com/gogo/protobuf/types"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
 )
@@ -42,6 +43,8 @@ type Container interface {
 	Labels(context.Context) (map[string]string, error)
 	// SetLabels sets the provided labels for the container and returns the final label set
 	SetLabels(context.Context, map[string]string) (map[string]string, error)
+	// Extensions returns the extensions set on the container
+	Extensions() map[string]prototypes.Any
 }
 
 func containerFromRecord(client *Client, c containers.Container) *container {
@@ -158,6 +161,12 @@ func (c *container) Image(ctx context.Context) (Image, error) {
 	}, nil
 }
 
+func (c *container) Extensions() map[string]prototypes.Any {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.c.Extensions
+}
+
 func (c *container) NewTask(ctx context.Context, ioCreate IOCreation, opts ...NewTaskOpts) (Task, error) {
 	c.mu.Lock()
 	defer c.mu.Unlock()

container_opts.go

@@ -128,3 +128,28 @@ func setSnapshotterIfEmpty(c *containers.Container) {
 		c.Snapshotter = DefaultSnapshotter
 	}
 }
+
+// WithContainerExtension appends extension data to the container object.
+// Use this to decorate the container object with additional data for the client
+// integration.
+//
+// Make sure to register the type of `extension` in the typeurl package via
+// `typeurl.Register` otherwise the type data will be inferred, including how
+// to encode and decode the object.
+func WithContainerExtension(name string, extension interface{}) NewContainerOpts {
+	return func(ctx context.Context, client *Client, c *containers.Container) error {
+		any, err := typeurl.MarshalAny(extension)
+		if err != nil {
+			return err
+		}
+
+		if name == "" {
+			return errors.Wrapf(errdefs.ErrInvalidArgument, "extension key must not be zero-length")
+		}
+		if c.Extensions == nil {
+			c.Extensions = make(map[string]types.Any)
+		}
+		c.Extensions[name] = *any
+		return nil
+	}
+}

container_test.go

@@ -14,6 +14,7 @@ import (
 	_ "github.com/containerd/containerd/runtime"
 
 	"github.com/containerd/containerd/errdefs"
+	gogotypes "github.com/gogo/protobuf/types"
 )
 
 func empty() IOCreation {
@@ -1368,3 +1369,45 @@ func TestContainerMetrics(t *testing.T) {
 
 	<-statusC
 }
+
+func TestContainerExtensions(t *testing.T) {
+	t.Parallel()
+
+	ctx, cancel := testContext()
+	defer cancel()
+	id := t.Name()
+
+	client, err := newClient(t, address)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer client.Close()
+
+	ext := gogotypes.Any{TypeUrl: "test.ext.url", Value: []byte("hello")}
+	container, err := client.NewContainer(ctx, id, WithNewSpec(), WithContainerExtension("hello", &ext))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer container.Delete(ctx)
+
+	checkExt := func(container Container) {
+		cExts := container.Extensions()
+		if len(cExts) != 1 {
+			t.Fatal("expected 1 container extension")
+		}
+		if cExts["hello"].TypeUrl != ext.TypeUrl {
+			t.Fatalf("got unexpected type url for extension: %s", cExts["hello"].TypeUrl)
+		}
+		if !bytes.Equal(cExts["hello"].Value, ext.Value) {
+			t.Fatalf("expected extension value %q, got: %q", ext.Value, cExts["hello"].Value)
+		}
+	}
+
+	checkExt(container)
+
+	container, err = client.LoadContainer(ctx, container.ID())
+	if err != nil {
+		t.Fatal(err)
+	}
+	checkExt(container)
+}

containers/containers.go

@@ -57,6 +57,9 @@ type Container struct {
 
 	// UpdatedAt is the time at which the container was updated.
 	UpdatedAt time.Time
+
+	// Extensions stores client-specified metadata
+	Extensions map[string]types.Any
 }
 
 type RuntimeInfo struct {

containerstore.go

@@ -97,6 +97,7 @@ func containerToProto(container *containers.Container) containersapi.Container {
 		Spec:        container.Spec,
 		Snapshotter: container.Snapshotter,
 		SnapshotKey: container.SnapshotKey,
+		Extensions:  container.Extensions,
 	}
 }
 
@@ -116,6 +117,7 @@ func containerFromProto(containerpb *containersapi.Container) containers.Contain
 		Spec:        containerpb.Spec,
 		Snapshotter: containerpb.Snapshotter,
 		SnapshotKey: containerpb.SnapshotKey,
+		Extensions:  containerpb.Extensions,
 	}
 }
 

metadata/buckets.go

@@ -50,6 +50,7 @@ var (
 	bucketKeySnapshotKey = []byte("snapshotKey")
 	bucketKeySnapshotter = []byte("snapshotter")
 	bucketKeyTarget      = []byte("target")
+	bucketKeyExtensions  = []byte("extensions")
 )
 
 func getBucket(tx *bolt.Tx, keys ...[]byte) *bolt.Bucket {

metadata/containers.go

@@ -146,7 +146,7 @@ func (s *containerStore) Update(ctx context.Context, container containers.Contai
 
 	if len(fieldpaths) == 0 {
 		// only allow updates to these field on full replace.
-		fieldpaths = []string{"labels", "spec"}
+		fieldpaths = []string{"labels", "spec", "extensions"}
 
 		// Fields that are immutable must cause an error when no field paths
 		// are provided. This allows these fields to become mutable in the
@@ -181,11 +181,22 @@ func (s *containerStore) Update(ctx context.Context, container containers.Contai
 			continue
 		}
 
+		if strings.HasPrefix(path, "extensions.") {
+			if updated.Extensions == nil {
+				updated.Extensions = map[string]types.Any{}
+			}
+			key := strings.TrimPrefix(path, "extensions.")
+			updated.Extensions[key] = container.Extensions[key]
+			continue
+		}
+
 		switch path {
 		case "labels":
 			updated.Labels = container.Labels
 		case "spec":
 			updated.Spec = container.Spec
+		case "extensions":
+			updated.Extensions = container.Extensions
 		default:
 			return containers.Container{}, errors.Wrapf(errdefs.ErrInvalidArgument, "cannot update %q field on %q", path, container.ID)
 		}
@@ -226,6 +237,12 @@ func validateContainer(container *containers.Container) error {
 		return errors.Wrapf(err, "container.ID validation error")
 	}
 
+	for k := range container.Extensions {
+		if k == "" {
+			return errors.Wrapf(errdefs.ErrInvalidArgument, "container.Extension keys must not be zero-length")
+		}
+	}
+
 	// labels and image have no validation
 	if container.Runtime.Name == "" {
 		return errors.Wrapf(errdefs.ErrInvalidArgument, "container.Runtime.Name must be set")
@@ -288,6 +305,27 @@ func readContainer(container *containers.Container, bkt *bolt.Bucket) error {
 			container.SnapshotKey = string(v)
 		case string(bucketKeySnapshotter):
 			container.Snapshotter = string(v)
+		case string(bucketKeyExtensions):
+			ebkt := bkt.Bucket(bucketKeyExtensions)
+			if ebkt == nil {
+				return nil
+			}
+
+			extensions := make(map[string]types.Any)
+			if err := ebkt.ForEach(func(k, v []byte) error {
+				var a types.Any
+				if err := proto.Unmarshal(v, &a); err != nil {
+					return err
+				}
+
+				extensions[string(k)] = a
+				return nil
+			}); err != nil {
+
+				return err
+			}
+
+			container.Extensions = extensions
 		}
 
 		return nil
@@ -335,6 +373,24 @@ func writeContainer(bkt *bolt.Bucket, container *containers.Container) error {
 		return err
 	}
 
+	if len(container.Extensions) > 0 {
+		ebkt, err := bkt.CreateBucketIfNotExists(bucketKeyExtensions)
+		if err != nil {
+			return err
+		}
+
+		for name, ext := range container.Extensions {
+			p, err := proto.Marshal(&ext)
+			if err != nil {
+				return err
+			}
+
+			if err := ebkt.Put([]byte(name), p); err != nil {
+				return err
+			}
+		}
+	}
+
 	if container.Runtime.Options != nil {
 		data, err := proto.Marshal(container.Runtime.Options)
 		if err != nil {

metadata/containers_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/containerd/containerd/filters"
 	"github.com/containerd/containerd/namespaces"
 	"github.com/containerd/containerd/typeurl"
+	"github.com/gogo/protobuf/types"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
 )
@@ -420,6 +421,169 @@ func TestContainersCreateUpdateDelete(t *testing.T) {
 			},
 			createerr: errdefs.ErrInvalidArgument,
 		},
+		{
+			name: "UpdateExtensionsFull",
+			original: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("hello"),
+					},
+				},
+			},
+			input: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("world"),
+					},
+				},
+			},
+			expected: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("world"),
+					},
+				},
+			},
+		},
+		{
+			name: "UpdateExtensionsNotInFieldpath",
+			original: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("hello"),
+					},
+				},
+			},
+			input: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("world"),
+					},
+				},
+			},
+			fieldpaths: []string{"labels"},
+			expected: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("hello"),
+					},
+				},
+			},
+		},
+		{
+			name: "UpdateExtensionsFieldPath",
+			original: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("hello"),
+					},
+				},
+			},
+			input: containers.Container{
+				Labels: map[string]string{
+					"foo": "one",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("world"),
+					},
+				},
+			},
+			fieldpaths: []string{"extensions"},
+			expected: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("world"),
+					},
+				},
+			},
+		},
+		{
+			name: "UpdateExtensionsFieldPathIsolated",
+			original: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					// leaves hello in place.
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("hello"),
+					},
+				},
+			},
+			input: containers.Container{
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("universe"), // this will be ignored
+					},
+					"bar": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("foo"), // this will be added
+					},
+				},
+			},
+			fieldpaths: []string{"extensions.bar"}, //
+			expected: containers.Container{
+				Spec: encoded,
+				Runtime: containers.RuntimeInfo{
+					Name: "testruntime",
+				},
+				Extensions: map[string]types.Any{
+					"hello": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("hello"), // remains as world
+					},
+					"bar": {
+						TypeUrl: "test.update.extensions",
+						Value:   []byte("foo"), // this will be added
+					},
+				},
+			},
+		},
 	} {
 		t.Run(testcase.name, func(t *testing.T) {
 			testcase.original.ID = testcase.name
@@ -529,7 +693,7 @@ func checkContainerTimestamps(t *testing.T, c *containers.Container, now time.Ti
 
 func checkContainersEqual(t *testing.T, a, b *containers.Container, format string, args ...interface{}) {
 	if !reflect.DeepEqual(a, b) {
-		t.Fatalf("containers not equal %v != %v: "+format, append([]interface{}{a, b}, args...)...)
+		t.Fatalf("containers not equal \n\t%v != \n\t%v: "+format, append([]interface{}{a, b}, args...)...)
 	}
 }
 

services/containers/helpers.go

@@ -27,6 +27,7 @@ func containerToProto(container *containers.Container) api.Container {
 		Spec:        container.Spec,
 		Snapshotter: container.Snapshotter,
 		SnapshotKey: container.SnapshotKey,
+		Extensions:  container.Extensions,
 	}
 }
 
@@ -46,5 +47,6 @@ func containerFromProto(containerpb *api.Container) containers.Container {
 		Spec:        containerpb.Spec,
 		Snapshotter: containerpb.Snapshotter,
 		SnapshotKey: containerpb.SnapshotKey,
+		Extensions:  containerpb.Extensions,
 	}
 }