_protos: Update remote_execution.proto

3 files changed, 241 insertions, 146 deletions

diff --git a/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution.proto b/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution.proto
index 0cb33acaf..b69105d72 100644
--- a/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution.proto
+++ b/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution.proto
@@ -21,6 +21,7 @@ import "google/api/annotations.proto";
 import "google/longrunning/operations.proto";
 import "google/protobuf/duration.proto";
 import "google/protobuf/timestamp.proto";
+import "google/protobuf/wrappers.proto";
 import "google/rpc/status.proto";
 
 option csharp_namespace = "Build.Bazel.Remote.Execution.V2";
@@ -236,6 +237,10 @@ service ActionCache {
 // used in subsequent calls (e.g. to
 // [Execute][build.bazel.remote.execution.v2.Execution.Execute]).
 //
+// Servers MUST behave as though empty blobs are always available, even if they
+// have not been uploaded. Clients MAY optimize away the uploading or
+// downloading of empty blobs.
+//
 // As with other services in the Remote Execution API, any call may return an
 // error with a [RetryInfo][google.rpc.RetryInfo] error detail providing
 // information about when the client should retry the request; clients SHOULD
@@ -550,14 +555,17 @@ message Command {
   // empty, then the action is run in the input root.
   string working_directory = 6;
 
-  // List of required supported [NodeProperty][build.bazel.remote.execution.v2.NodeProperty]
-  // keys. In order to ensure that equivalent `Action`s always hash to the same
-  // value, the supported node properties MUST be lexicographically sorted by name.
+  // A list of keys for node properties the client expects to retrieve for
+  // output files and directories. Keys are either names of string-based
+  // [NodeProperty][build.bazel.remote.execution.v2.NodeProperty] or
+  // names of fields in [NodeProperties][build.bazel.remote.execution.v2.NodeProperties].
+  // In order to ensure that equivalent `Action`s always hash to the same
+  // value, the node properties MUST be lexicographically sorted by name.
   // Sorting of strings is done by code point, equivalently, by the UTF-8 bytes.
   //
-  // The interpretation of these properties is server-dependent. If a property is
-  // not recognized by the server, the server will return an `INVALID_ARGUMENT`
-  // error.
+  // The interpretation of string-based properties is server-dependent. If a
+  // property is not recognized by the server, the server will return an
+  // `INVALID_ARGUMENT`.
   repeated string output_node_properties = 8;
 }
 
@@ -686,7 +694,8 @@ message Directory {
   repeated SymlinkNode symlinks = 3;
 
   // The node properties of the Directory.
-  repeated NodeProperty node_properties = 4;
+  reserved 4;
+  NodeProperties node_properties = 5;
 }
 
 // A single property for [FileNodes][build.bazel.remote.execution.v2.FileNode],
@@ -702,6 +711,23 @@ message NodeProperty {
     string value = 2;
 }
 
+// Node properties for [FileNodes][build.bazel.remote.execution.v2.FileNode],
+// [DirectoryNodes][build.bazel.remote.execution.v2.DirectoryNode], and
+// [SymlinkNodes][build.bazel.remote.execution.v2.SymlinkNode]. The server is
+// responsible for specifying the properties that it accepts.
+//
+message NodeProperties {
+  // A list of string-based
+  // [NodeProperties][build.bazel.remote.execution.v2.NodeProperty].
+  repeated NodeProperty properties = 1;
+
+  // The file's last modification timestamp.
+  google.protobuf.Timestamp mtime = 2;
+
+  // The UNIX file mode, e.g., 0755.
+  google.protobuf.UInt32Value unix_mode = 3;
+}
+
 // A `FileNode` represents a single file and associated metadata.
 message FileNode {
   // The name of the file.
@@ -716,7 +742,8 @@ message FileNode {
   bool is_executable = 4;
 
   // The node properties of the FileNode.
-  repeated NodeProperty node_properties = 5;
+  reserved 5;
+  NodeProperties node_properties = 6;
 }
 
 // A `DirectoryNode` represents a child of a
@@ -747,7 +774,8 @@ message SymlinkNode {
   string target = 2;
 
   // The node properties of the SymlinkNode.
-  repeated NodeProperty node_properties = 3;
+  reserved 3;
+  NodeProperties node_properties = 4;
 }
 
 // A content digest. A digest for a given blob consists of the size of the blob
@@ -1018,7 +1046,8 @@ message OutputFile {
   bytes contents = 5;
 
   // The supported node properties of the OutputFile, if requested by the Action.
-  repeated NodeProperty node_properties = 6;
+  reserved 6;
+  NodeProperties node_properties = 7;
 }
 
 // A `Tree` contains all the
@@ -1073,7 +1102,8 @@ message OutputSymlink {
 
   // The supported node properties of the OutputSymlink, if requested by the
   // Action.
-  repeated NodeProperty node_properties = 3;
+  reserved 3;
+  NodeProperties node_properties = 4;
 }
 
 // An `ExecutionPolicy` can be used to control the scheduling of the action.
@@ -1229,14 +1259,14 @@ message ExecuteOperationMetadata {
   // being executed.
   Digest action_digest = 2;
 
-  // If set, the client can use this name with
+  // If set, the client can use this resource name with
   // [ByteStream.Read][google.bytestream.ByteStream.Read] to stream the
-  // standard output.
+  // standard output from the endpoint hosting streamed responses.
   string stdout_stream_name = 3;
 
-  // If set, the client can use this name with
+  // If set, the client can use this resource name with
   // [ByteStream.Read][google.bytestream.ByteStream.Read] to stream the
-  // standard error.
+  // standard error from the endpoint hosting streamed responses.
   string stderr_stream_name = 4;
 }
 
diff --git a/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2.py b/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2.py
index e3e0e4a86..cab2f499e 100644
--- a/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2.py
+++ b/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2.py
@@ -16,6 +16,7 @@ from buildstream._protos.google.api import annotations_pb2 as google_dot_api_dot
 from buildstream._protos.google.longrunning import operations_pb2 as google_dot_longrunning_dot_operations__pb2
 from google.protobuf import duration_pb2 as google_dot_protobuf_dot_duration__pb2
 from google.protobuf import timestamp_pb2 as google_dot_protobuf_dot_timestamp__pb2
+from google.protobuf import wrappers_pb2 as google_dot_protobuf_dot_wrappers__pb2
 from buildstream._protos.google.rpc import status_pb2 as google_dot_rpc_dot_status__pb2
 
 
@@ -24,9 +25,9 @@ DESCRIPTOR = _descriptor.FileDescriptor(
   package='build.bazel.remote.execution.v2',
   syntax='proto3',
   serialized_options=b'\n\037build.bazel.remote.execution.v2B\024RemoteExecutionProtoP\001Z\017remoteexecution\242\002\003REX\252\002\037Build.Bazel.Remote.Execution.V2',
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   ,
-  dependencies=[build_dot_bazel_dot_semver_dot_semver__pb2.DESCRIPTOR,google_dot_api_dot_annotations__pb2.DESCRIPTOR,google_dot_longrunning_dot_operations__pb2.DESCRIPTOR,google_dot_protobuf_dot_duration__pb2.DESCRIPTOR,google_dot_protobuf_dot_timestamp__pb2.DESCRIPTOR,google_dot_rpc_dot_status__pb2.DESCRIPTOR,])
+  dependencies=[build_dot_bazel_dot_semver_dot_semver__pb2.DESCRIPTOR,google_dot_api_dot_annotations__pb2.DESCRIPTOR,google_dot_longrunning_dot_operations__pb2.DESCRIPTOR,google_dot_protobuf_dot_duration__pb2.DESCRIPTOR,google_dot_protobuf_dot_timestamp__pb2.DESCRIPTOR,google_dot_protobuf_dot_wrappers__pb2.DESCRIPTOR,google_dot_rpc_dot_status__pb2.DESCRIPTOR,])
 
 
 
@@ -59,8 +60,8 @@ _EXECUTIONSTAGE_VALUE = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=4438,
-  serialized_end=4517,
+  serialized_start=4688,
+  serialized_end=4767,
 )
 _sym_db.RegisterEnumDescriptor(_EXECUTIONSTAGE_VALUE)
 
@@ -101,8 +102,8 @@ _DIGESTFUNCTION_VALUE = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=6899,
-  serialized_end=6983,
+  serialized_start=7149,
+  serialized_end=7233,
 )
 _sym_db.RegisterEnumDescriptor(_DIGESTFUNCTION_VALUE)
 
@@ -127,8 +128,8 @@ _SYMLINKABSOLUTEPATHSTRATEGY_VALUE = _descriptor.EnumDescriptor(
   ],
   containing_type=None,
   serialized_options=None,
-  serialized_start=7248,
-  serialized_end=7297,
+  serialized_start=7498,
+  serialized_end=7547,
 )
 _sym_db.RegisterEnumDescriptor(_SYMLINKABSOLUTEPATHSTRATEGY_VALUE)
 
@@ -180,8 +181,8 @@ _ACTION = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=282,
-  serialized_end=501,
+  serialized_start=314,
+  serialized_end=533,
 )
 
 
@@ -218,8 +219,8 @@ _COMMAND_ENVIRONMENTVARIABLE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=819,
-  serialized_end=869,
+  serialized_start=851,
+  serialized_end=901,
 )
 
 _COMMAND = _descriptor.Descriptor(
@@ -297,8 +298,8 @@ _COMMAND = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=504,
-  serialized_end=869,
+  serialized_start=536,
+  serialized_end=901,
 )
 
 
@@ -335,8 +336,8 @@ _PLATFORM_PROPERTY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=955,
-  serialized_end=994,
+  serialized_start=987,
+  serialized_end=1026,
 )
 
 _PLATFORM = _descriptor.Descriptor(
@@ -365,8 +366,8 @@ _PLATFORM = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=871,
-  serialized_end=994,
+  serialized_start=903,
+  serialized_end=1026,
 )
 
 
@@ -400,8 +401,8 @@ _DIRECTORY = _descriptor.Descriptor(
       serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='node_properties', full_name='build.bazel.remote.execution.v2.Directory.node_properties', index=3,
-      number=4, type=11, cpp_type=10, label=3,
-      has_default_value=False, default_value=[],
+      number=5, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       serialized_options=None, file=DESCRIPTOR),
@@ -417,8 +418,8 @@ _DIRECTORY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=997,
-  serialized_end=1271,
+  serialized_start=1029,
+  serialized_end=1311,
 )
 
 
@@ -455,8 +456,53 @@ _NODEPROPERTY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1273,
-  serialized_end=1316,
+  serialized_start=1313,
+  serialized_end=1356,
+)
+
+
+_NODEPROPERTIES = _descriptor.Descriptor(
+  name='NodeProperties',
+  full_name='build.bazel.remote.execution.v2.NodeProperties',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='properties', full_name='build.bazel.remote.execution.v2.NodeProperties.properties', index=0,
+      number=1, type=11, cpp_type=10, label=3,
+      has_default_value=False, default_value=[],
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='mtime', full_name='build.bazel.remote.execution.v2.NodeProperties.mtime', index=1,
+      number=2, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='unix_mode', full_name='build.bazel.remote.execution.v2.NodeProperties.unix_mode', index=2,
+      number=3, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=1359,
+  serialized_end=1534,
 )
 
 
@@ -490,8 +536,8 @@ _FILENODE = _descriptor.Descriptor(
       serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='node_properties', full_name='build.bazel.remote.execution.v2.FileNode.node_properties', index=3,
-      number=5, type=11, cpp_type=10, label=3,
-      has_default_value=False, default_value=[],
+      number=6, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       serialized_options=None, file=DESCRIPTOR),
@@ -507,8 +553,8 @@ _FILENODE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1319,
-  serialized_end=1501,
+  serialized_start=1537,
+  serialized_end=1727,
 )
 
 
@@ -545,8 +591,8 @@ _DIRECTORYNODE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1503,
-  serialized_end=1589,
+  serialized_start=1729,
+  serialized_end=1815,
 )
 
 
@@ -573,8 +619,8 @@ _SYMLINKNODE = _descriptor.Descriptor(
       serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='node_properties', full_name='build.bazel.remote.execution.v2.SymlinkNode.node_properties', index=2,
-      number=3, type=11, cpp_type=10, label=3,
-      has_default_value=False, default_value=[],
+      number=4, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       serialized_options=None, file=DESCRIPTOR),
@@ -590,8 +636,8 @@ _SYMLINKNODE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1591,
-  serialized_end=1706,
+  serialized_start=1817,
+  serialized_end=1940,
 )
 
 
@@ -628,8 +674,8 @@ _DIGEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1708,
-  serialized_end=1750,
+  serialized_start=1942,
+  serialized_end=1984,
 )
 
 
@@ -722,8 +768,8 @@ _EXECUTEDACTIONMETADATA = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=1753,
-  serialized_end=2373,
+  serialized_start=1987,
+  serialized_end=2607,
 )
 
 
@@ -823,8 +869,8 @@ _ACTIONRESULT = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=2376,
-  serialized_end=3047,
+  serialized_start=2610,
+  serialized_end=3281,
 )
 
 
@@ -865,8 +911,8 @@ _OUTPUTFILE = _descriptor.Descriptor(
       serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='node_properties', full_name='build.bazel.remote.execution.v2.OutputFile.node_properties', index=4,
-      number=6, type=11, cpp_type=10, label=3,
-      has_default_value=False, default_value=[],
+      number=7, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       serialized_options=None, file=DESCRIPTOR),
@@ -882,8 +928,8 @@ _OUTPUTFILE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3050,
-  serialized_end=3252,
+  serialized_start=3284,
+  serialized_end=3494,
 )
 
 
@@ -920,8 +966,8 @@ _TREE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3254,
-  serialized_end=3380,
+  serialized_start=3496,
+  serialized_end=3622,
 )
 
 
@@ -958,8 +1004,8 @@ _OUTPUTDIRECTORY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3382,
-  serialized_end=3481,
+  serialized_start=3624,
+  serialized_end=3723,
 )
 
 
@@ -986,8 +1032,8 @@ _OUTPUTSYMLINK = _descriptor.Descriptor(
       serialized_options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
       name='node_properties', full_name='build.bazel.remote.execution.v2.OutputSymlink.node_properties', index=2,
-      number=3, type=11, cpp_type=10, label=3,
-      has_default_value=False, default_value=[],
+      number=4, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       serialized_options=None, file=DESCRIPTOR),
@@ -1003,8 +1049,8 @@ _OUTPUTSYMLINK = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3483,
-  serialized_end=3600,
+  serialized_start=3725,
+  serialized_end=3850,
 )
 
 
@@ -1034,8 +1080,8 @@ _EXECUTIONPOLICY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3602,
-  serialized_end=3637,
+  serialized_start=3852,
+  serialized_end=3887,
 )
 
 
@@ -1065,8 +1111,8 @@ _RESULTSCACHEPOLICY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3639,
-  serialized_end=3677,
+  serialized_start=3889,
+  serialized_end=3927,
 )
 
 
@@ -1124,8 +1170,8 @@ _EXECUTEREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3680,
-  serialized_end=3987,
+  serialized_start=3930,
+  serialized_end=4237,
 )
 
 
@@ -1162,8 +1208,8 @@ _LOGFILE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=3989,
-  serialized_end=4079,
+  serialized_start=4239,
+  serialized_end=4329,
 )
 
 
@@ -1200,8 +1246,8 @@ _EXECUTERESPONSE_SERVERLOGSENTRY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4327,
-  serialized_end=4418,
+  serialized_start=4577,
+  serialized_end=4668,
 )
 
 _EXECUTERESPONSE = _descriptor.Descriptor(
@@ -1258,8 +1304,8 @@ _EXECUTERESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4082,
-  serialized_end=4418,
+  serialized_start=4332,
+  serialized_end=4668,
 )
 
 
@@ -1283,8 +1329,8 @@ _EXECUTIONSTAGE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4420,
-  serialized_end=4517,
+  serialized_start=4670,
+  serialized_end=4767,
 )
 
 
@@ -1335,8 +1381,8 @@ _EXECUTEOPERATIONMETADATA = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4520,
-  serialized_end=4736,
+  serialized_start=4770,
+  serialized_end=4986,
 )
 
 
@@ -1366,8 +1412,8 @@ _WAITEXECUTIONREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4738,
-  serialized_end=4774,
+  serialized_start=4988,
+  serialized_end=5024,
 )
 
 
@@ -1425,8 +1471,8 @@ _GETACTIONRESULTREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4777,
-  serialized_end=4963,
+  serialized_start=5027,
+  serialized_end=5213,
 )
 
 
@@ -1477,8 +1523,8 @@ _UPDATEACTIONRESULTREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=4966,
-  serialized_end=5233,
+  serialized_start=5216,
+  serialized_end=5483,
 )
 
 
@@ -1515,8 +1561,8 @@ _FINDMISSINGBLOBSREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5235,
-  serialized_end=5346,
+  serialized_start=5485,
+  serialized_end=5596,
 )
 
 
@@ -1546,8 +1592,8 @@ _FINDMISSINGBLOBSRESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5348,
-  serialized_end=5445,
+  serialized_start=5598,
+  serialized_end=5695,
 )
 
 
@@ -1584,8 +1630,8 @@ _BATCHUPDATEBLOBSREQUEST_REQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5582,
-  serialized_end=5662,
+  serialized_start=5832,
+  serialized_end=5912,
 )
 
 _BATCHUPDATEBLOBSREQUEST = _descriptor.Descriptor(
@@ -1621,8 +1667,8 @@ _BATCHUPDATEBLOBSREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5448,
-  serialized_end=5662,
+  serialized_start=5698,
+  serialized_end=5912,
 )
 
 
@@ -1659,8 +1705,8 @@ _BATCHUPDATEBLOBSRESPONSE_RESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5780,
-  serialized_end=5883,
+  serialized_start=6030,
+  serialized_end=6133,
 )
 
 _BATCHUPDATEBLOBSRESPONSE = _descriptor.Descriptor(
@@ -1689,8 +1735,8 @@ _BATCHUPDATEBLOBSRESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5665,
-  serialized_end=5883,
+  serialized_start=5915,
+  serialized_end=6133,
 )
 
 
@@ -1727,8 +1773,8 @@ _BATCHREADBLOBSREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5885,
-  serialized_end=5989,
+  serialized_start=6135,
+  serialized_end=6239,
 )
 
 
@@ -1772,8 +1818,8 @@ _BATCHREADBLOBSRESPONSE_RESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6103,
-  serialized_end=6220,
+  serialized_start=6353,
+  serialized_end=6470,
 )
 
 _BATCHREADBLOBSRESPONSE = _descriptor.Descriptor(
@@ -1802,8 +1848,8 @@ _BATCHREADBLOBSRESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=5992,
-  serialized_end=6220,
+  serialized_start=6242,
+  serialized_end=6470,
 )
 
 
@@ -1854,8 +1900,8 @@ _GETTREEREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6223,
-  serialized_end=6363,
+  serialized_start=6473,
+  serialized_end=6613,
 )
 
 
@@ -1892,8 +1938,8 @@ _GETTREERESPONSE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6365,
-  serialized_end=6472,
+  serialized_start=6615,
+  serialized_end=6722,
 )
 
 
@@ -1923,8 +1969,8 @@ _GETCAPABILITIESREQUEST = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6474,
-  serialized_end=6521,
+  serialized_start=6724,
+  serialized_end=6771,
 )
 
 
@@ -1982,8 +2028,8 @@ _SERVERCAPABILITIES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6524,
-  serialized_end=6879,
+  serialized_start=6774,
+  serialized_end=7129,
 )
 
 
@@ -2007,8 +2053,8 @@ _DIGESTFUNCTION = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6881,
-  serialized_end=6983,
+  serialized_start=7131,
+  serialized_end=7233,
 )
 
 
@@ -2038,8 +2084,8 @@ _ACTIONCACHEUPDATECAPABILITIES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=6985,
-  serialized_end=7040,
+  serialized_start=7235,
+  serialized_end=7290,
 )
 
 
@@ -2076,8 +2122,8 @@ _PRIORITYCAPABILITIES_PRIORITYRANGE = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=7156,
-  serialized_end=7215,
+  serialized_start=7406,
+  serialized_end=7465,
 )
 
 _PRIORITYCAPABILITIES = _descriptor.Descriptor(
@@ -2106,8 +2152,8 @@ _PRIORITYCAPABILITIES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=7043,
-  serialized_end=7215,
+  serialized_start=7293,
+  serialized_end=7465,
 )
 
 
@@ -2131,8 +2177,8 @@ _SYMLINKABSOLUTEPATHSTRATEGY = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=7217,
-  serialized_end=7297,
+  serialized_start=7467,
+  serialized_end=7547,
 )
 
 
@@ -2190,8 +2236,8 @@ _CACHECAPABILITIES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=7300,
-  serialized_end=7741,
+  serialized_start=7550,
+  serialized_end=7991,
 )
 
 
@@ -2242,8 +2288,8 @@ _EXECUTIONCAPABILITIES = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=7744,
-  serialized_end=8000,
+  serialized_start=7994,
+  serialized_end=8250,
 )
 
 
@@ -2280,8 +2326,8 @@ _TOOLDETAILS = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=8002,
-  serialized_end=8056,
+  serialized_start=8252,
+  serialized_end=8306,
 )
 
 
@@ -2332,8 +2378,8 @@ _REQUESTMETADATA = _descriptor.Descriptor(
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=8059,
-  serialized_end=8226,
+  serialized_start=8309,
+  serialized_end=8476,
 )
 
 _ACTION.fields_by_name['command_digest'].message_type = _DIGEST
@@ -2347,11 +2393,14 @@ _PLATFORM.fields_by_name['properties'].message_type = _PLATFORM_PROPERTY
 _DIRECTORY.fields_by_name['files'].message_type = _FILENODE
 _DIRECTORY.fields_by_name['directories'].message_type = _DIRECTORYNODE
 _DIRECTORY.fields_by_name['symlinks'].message_type = _SYMLINKNODE
-_DIRECTORY.fields_by_name['node_properties'].message_type = _NODEPROPERTY
+_DIRECTORY.fields_by_name['node_properties'].message_type = _NODEPROPERTIES
+_NODEPROPERTIES.fields_by_name['properties'].message_type = _NODEPROPERTY
+_NODEPROPERTIES.fields_by_name['mtime'].message_type = google_dot_protobuf_dot_timestamp__pb2._TIMESTAMP
+_NODEPROPERTIES.fields_by_name['unix_mode'].message_type = google_dot_protobuf_dot_wrappers__pb2._UINT32VALUE
 _FILENODE.fields_by_name['digest'].message_type = _DIGEST
-_FILENODE.fields_by_name['node_properties'].message_type = _NODEPROPERTY
+_FILENODE.fields_by_name['node_properties'].message_type = _NODEPROPERTIES
 _DIRECTORYNODE.fields_by_name['digest'].message_type = _DIGEST
-_SYMLINKNODE.fields_by_name['node_properties'].message_type = _NODEPROPERTY
+_SYMLINKNODE.fields_by_name['node_properties'].message_type = _NODEPROPERTIES
 _EXECUTEDACTIONMETADATA.fields_by_name['queued_timestamp'].message_type = google_dot_protobuf_dot_timestamp__pb2._TIMESTAMP
 _EXECUTEDACTIONMETADATA.fields_by_name['worker_start_timestamp'].message_type = google_dot_protobuf_dot_timestamp__pb2._TIMESTAMP
 _EXECUTEDACTIONMETADATA.fields_by_name['worker_completed_timestamp'].message_type = google_dot_protobuf_dot_timestamp__pb2._TIMESTAMP
@@ -2370,11 +2419,11 @@ _ACTIONRESULT.fields_by_name['stdout_digest'].message_type = _DIGEST
 _ACTIONRESULT.fields_by_name['stderr_digest'].message_type = _DIGEST
 _ACTIONRESULT.fields_by_name['execution_metadata'].message_type = _EXECUTEDACTIONMETADATA
 _OUTPUTFILE.fields_by_name['digest'].message_type = _DIGEST
-_OUTPUTFILE.fields_by_name['node_properties'].message_type = _NODEPROPERTY
+_OUTPUTFILE.fields_by_name['node_properties'].message_type = _NODEPROPERTIES
 _TREE.fields_by_name['root'].message_type = _DIRECTORY
 _TREE.fields_by_name['children'].message_type = _DIRECTORY
 _OUTPUTDIRECTORY.fields_by_name['tree_digest'].message_type = _DIGEST
-_OUTPUTSYMLINK.fields_by_name['node_properties'].message_type = _NODEPROPERTY
+_OUTPUTSYMLINK.fields_by_name['node_properties'].message_type = _NODEPROPERTIES
 _EXECUTEREQUEST.fields_by_name['action_digest'].message_type = _DIGEST
 _EXECUTEREQUEST.fields_by_name['execution_policy'].message_type = _EXECUTIONPOLICY
 _EXECUTEREQUEST.fields_by_name['results_cache_policy'].message_type = _RESULTSCACHEPOLICY
@@ -2428,6 +2477,7 @@ DESCRIPTOR.message_types_by_name['Command'] = _COMMAND
 DESCRIPTOR.message_types_by_name['Platform'] = _PLATFORM
 DESCRIPTOR.message_types_by_name['Directory'] = _DIRECTORY
 DESCRIPTOR.message_types_by_name['NodeProperty'] = _NODEPROPERTY
+DESCRIPTOR.message_types_by_name['NodeProperties'] = _NODEPROPERTIES
 DESCRIPTOR.message_types_by_name['FileNode'] = _FILENODE
 DESCRIPTOR.message_types_by_name['DirectoryNode'] = _DIRECTORYNODE
 DESCRIPTOR.message_types_by_name['SymlinkNode'] = _SYMLINKNODE
@@ -2519,6 +2569,13 @@ NodeProperty = _reflection.GeneratedProtocolMessageType('NodeProperty', (_messag
   })
 _sym_db.RegisterMessage(NodeProperty)
 
+NodeProperties = _reflection.GeneratedProtocolMessageType('NodeProperties', (_message.Message,), {
+  'DESCRIPTOR' : _NODEPROPERTIES,
+  '__module__' : 'build.bazel.remote.execution.v2.remote_execution_pb2'
+  # @@protoc_insertion_point(class_scope:build.bazel.remote.execution.v2.NodeProperties)
+  })
+_sym_db.RegisterMessage(NodeProperties)
+
 FileNode = _reflection.GeneratedProtocolMessageType('FileNode', (_message.Message,), {
   'DESCRIPTOR' : _FILENODE,
   '__module__' : 'build.bazel.remote.execution.v2.remote_execution_pb2'
@@ -2835,8 +2892,8 @@ _EXECUTION = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=0,
   serialized_options=None,
-  serialized_start=8229,
-  serialized_end=8542,
+  serialized_start=8479,
+  serialized_end=8792,
   methods=[
   _descriptor.MethodDescriptor(
     name='Execute',
@@ -2868,8 +2925,8 @@ _ACTIONCACHE = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=1,
   serialized_options=None,
-  serialized_start=8545,
-  serialized_end=9015,
+  serialized_start=8795,
+  serialized_end=9265,
   methods=[
   _descriptor.MethodDescriptor(
     name='GetActionResult',
@@ -2901,8 +2958,8 @@ _CONTENTADDRESSABLESTORAGE = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=2,
   serialized_options=None,
-  serialized_start=9018,
-  serialized_end=9813,
+  serialized_start=9268,
+  serialized_end=10063,
   methods=[
   _descriptor.MethodDescriptor(
     name='FindMissingBlobs',
@@ -2952,8 +3009,8 @@ _CAPABILITIES = _descriptor.ServiceDescriptor(
   file=DESCRIPTOR,
   index=3,
   serialized_options=None,
-  serialized_start=9816,
-  serialized_end=10005,
+  serialized_start=10066,
+  serialized_end=10255,
   methods=[
   _descriptor.MethodDescriptor(
     name='GetCapabilities',
diff --git a/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2_grpc.py b/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2_grpc.py
index e0fd39a28..33ca1c6aa 100644
--- a/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2_grpc.py
+++ b/src/buildstream/_protos/build/bazel/remote/execution/v2/remote_execution_pb2_grpc.py
@@ -325,6 +325,10 @@ class ContentAddressableStorageStub(object):
   used in subsequent calls (e.g. to
   [Execute][build.bazel.remote.execution.v2.Execution.Execute]).
 
+  Servers MUST behave as though empty blobs are always available, even if they
+  have not been uploaded. Clients MAY optimize away the uploading or
+  downloading of empty blobs.
+
   As with other services in the Remote Execution API, any call may return an
   error with a [RetryInfo][google.rpc.RetryInfo] error detail providing
   information about when the client should retry the request; clients SHOULD
@@ -424,6 +428,10 @@ class ContentAddressableStorageServicer(object):
   used in subsequent calls (e.g. to
   [Execute][build.bazel.remote.execution.v2.Execution.Execute]).
 
+  Servers MUST behave as though empty blobs are always available, even if they
+  have not been uploaded. Clients MAY optimize away the uploading or
+  downloading of empty blobs.
+
   As with other services in the Remote Execution API, any call may return an
   error with a [RetryInfo][google.rpc.RetryInfo] error detail providing
   information about when the client should retry the request; clients SHOULD