feat(tvix/build/protos): add additional_files field r/7312

Nix builds also have some other inputs, outside of inputs_dir, used in
derivations setting `passAsFile` and `__structuredAttrs`.

This extends our `BuildRequest` structure to accomodate these usecases.

Change-Id: I8de6516eb467fa48a4961d88933ebd548f131049
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10519
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>

3 files changed, 142 insertions, 39 deletions

diff --git a/tvix/build-go/build.pb.go b/tvix/build-go/build.pb.go
index fd387c1c3b..acd58b3737 100644
--- a/tvix/build-go/build.pb.go
+++ b/tvix/build-go/build.pb.go
@@ -104,6 +104,10 @@ type BuildRequest struct {
 	// A set of constraints that need to be satisfied on a build host before a
 	// Build can be started.
 	Constraints *BuildRequest_BuildConstraints `protobuf:"bytes,8,opt,name=constraints,proto3" json:"constraints,omitempty"`
+	// Additional (small) files and their contents that should be placed into the
+	// build environment, but outside inputs_dir.
+	// Used for passAsFile and structuredAttrs in Nix.
+	AdditionalFiles []*BuildRequest_AdditionalFile `protobuf:"bytes,9,rep,name=additional_files,json=additionalFiles,proto3" json:"additional_files,omitempty"`
 }
 
 func (x *BuildRequest) Reset() {
@@ -194,6 +198,13 @@ func (x *BuildRequest) GetConstraints() *BuildRequest_BuildConstraints {
 	return nil
 }
 
+func (x *BuildRequest) GetAdditionalFiles() []*BuildRequest_AdditionalFile {
+	if x != nil {
+		return x.AdditionalFiles
+	}
+	return nil
+}
+
 // A Build is (one possible) outcome of executing a [BuildRequest].
 type Build struct {
 	state         protoimpl.MessageState
@@ -399,6 +410,61 @@ func (x *BuildRequest_BuildConstraints) GetProvideBinSh() bool {
 	return false
 }
 
+type BuildRequest_AdditionalFile struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Path     string `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
+	Contents []byte `protobuf:"bytes,2,opt,name=contents,proto3" json:"contents,omitempty"`
+}
+
+func (x *BuildRequest_AdditionalFile) Reset() {
+	*x = BuildRequest_AdditionalFile{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_build_protos_build_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *BuildRequest_AdditionalFile) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*BuildRequest_AdditionalFile) ProtoMessage() {}
+
+func (x *BuildRequest_AdditionalFile) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_build_protos_build_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use BuildRequest_AdditionalFile.ProtoReflect.Descriptor instead.
+func (*BuildRequest_AdditionalFile) Descriptor() ([]byte, []int) {
+	return file_tvix_build_protos_build_proto_rawDescGZIP(), []int{0, 2}
+}
+
+func (x *BuildRequest_AdditionalFile) GetPath() string {
+	if x != nil {
+		return x.Path
+	}
+	return ""
+}
+
+func (x *BuildRequest_AdditionalFile) GetContents() []byte {
+	if x != nil {
+		return x.Contents
+	}
+	return nil
+}
+
 var File_tvix_build_protos_build_proto protoreflect.FileDescriptor
 
 var file_tvix_build_protos_build_proto_rawDesc = []byte{
@@ -407,7 +473,7 @@ var file_tvix_build_protos_build_proto_rawDesc = []byte{
 	0x0d, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x2e, 0x76, 0x31, 0x1a, 0x21,
 	0x74, 0x76, 0x69, 0x78, 0x2f, 0x63, 0x61, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f,
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 	0x73, 0x74, 0x12, 0x2d, 0x0a, 0x06, 0x69, 0x6e, 0x70, 0x75, 0x74, 0x73, 0x18, 0x01, 0x20, 0x03,
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@@ -431,33 +497,42 @@ var file_tvix_build_protos_build_proto_rawDesc = []byte{
 	0x75, 0x69, 0x6c, 0x64, 0x2e, 0x76, 0x31, 0x2e, 0x42, 0x75, 0x69, 0x6c, 0x64, 0x52, 0x65, 0x71,
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 }
 
 var (
@@ -472,25 +547,27 @@ func file_tvix_build_protos_build_proto_rawDescGZIP() []byte {
 	return file_tvix_build_protos_build_proto_rawDescData
 }
 
-var file_tvix_build_protos_build_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_tvix_build_protos_build_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_tvix_build_protos_build_proto_goTypes = []interface{}{
 	(*BuildRequest)(nil),                  // 0: tvix.build.v1.BuildRequest
 	(*Build)(nil),                         // 1: tvix.build.v1.Build
 	(*BuildRequest_EnvVar)(nil),           // 2: tvix.build.v1.BuildRequest.EnvVar
 	(*BuildRequest_BuildConstraints)(nil), // 3: tvix.build.v1.BuildRequest.BuildConstraints
-	(*castore_go.Node)(nil),               // 4: tvix.castore.v1.Node
+	(*BuildRequest_AdditionalFile)(nil),   // 4: tvix.build.v1.BuildRequest.AdditionalFile
+	(*castore_go.Node)(nil),               // 5: tvix.castore.v1.Node
 }
 var file_tvix_build_protos_build_proto_depIdxs = []int32{
-	4, // 0: tvix.build.v1.BuildRequest.inputs:type_name -> tvix.castore.v1.Node
+	5, // 0: tvix.build.v1.BuildRequest.inputs:type_name -> tvix.castore.v1.Node
 	2, // 1: tvix.build.v1.BuildRequest.environment_vars:type_name -> tvix.build.v1.BuildRequest.EnvVar
 	3, // 2: tvix.build.v1.BuildRequest.constraints:type_name -> tvix.build.v1.BuildRequest.BuildConstraints
-	0, // 3: tvix.build.v1.Build.build_request:type_name -> tvix.build.v1.BuildRequest
-	4, // 4: tvix.build.v1.Build.outputs:type_name -> tvix.castore.v1.Node
-	5, // [5:5] is the sub-list for method output_type
-	5, // [5:5] is the sub-list for method input_type
-	5, // [5:5] is the sub-list for extension type_name
-	5, // [5:5] is the sub-list for extension extendee
-	0, // [0:5] is the sub-list for field type_name
+	4, // 3: tvix.build.v1.BuildRequest.additional_files:type_name -> tvix.build.v1.BuildRequest.AdditionalFile
+	0, // 4: tvix.build.v1.Build.build_request:type_name -> tvix.build.v1.BuildRequest
+	5, // 5: tvix.build.v1.Build.outputs:type_name -> tvix.castore.v1.Node
+	6, // [6:6] is the sub-list for method output_type
+	6, // [6:6] is the sub-list for method input_type
+	6, // [6:6] is the sub-list for extension type_name
+	6, // [6:6] is the sub-list for extension extendee
+	0, // [0:6] is the sub-list for field type_name
 }
 
 func init() { file_tvix_build_protos_build_proto_init() }
@@ -547,6 +624,18 @@ func file_tvix_build_protos_build_proto_init() {
 				return nil
 			}
 		}
+		file_tvix_build_protos_build_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BuildRequest_AdditionalFile); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -554,7 +643,7 @@ func file_tvix_build_protos_build_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_tvix_build_protos_build_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   4,
+			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/tvix/build/protos/build.proto b/tvix/build/protos/build.proto
index e007ce968a..f6c62b8774 100644
--- a/tvix/build/protos/build.proto
+++ b/tvix/build/protos/build.proto
@@ -122,6 +122,16 @@ message BuildRequest {
     bool provide_bin_sh = 5;
   }
 
+  // Additional (small) files and their contents that should be placed into the
+  // build environment, but outside inputs_dir.
+  // Used for passAsFile and structuredAttrs in Nix.
+  repeated AdditionalFile additional_files = 9;
+
+  message AdditionalFile {
+    string path = 1;
+    bytes contents = 2;
+  }
+
   // TODO: allow describing something like "preferLocal", to influence composition?
 }
 
diff --git a/tvix/glue/src/tvix_build.rs b/tvix/glue/src/tvix_build.rs
index b647c7d405..85a9ba40ac 100644
--- a/tvix/glue/src/tvix_build.rs
+++ b/tvix/glue/src/tvix_build.rs
@@ -151,6 +151,8 @@ where
         constraints,
         working_dir: "build".into(),
         scratch_paths: vec!["build".into(), "nix/store".into()],
+        // TODO: handle passAsFile, structuredAttrs.
+        additional_files: vec![],
     }
 }
 
@@ -250,6 +252,7 @@ mod test {
                     available_ro_paths: vec![],
                     provide_bin_sh: true,
                 }),
+                additional_files: vec![],
                 working_dir: "build".into(),
                 scratch_paths: vec!["build".into(), "nix/store".into()],
             },
@@ -318,6 +321,7 @@ mod test {
                     available_ro_paths: vec![],
                     provide_bin_sh: true,
                 }),
+                additional_files: vec![],
                 working_dir: "build".into(),
                 scratch_paths: vec!["build".into(), "nix/store".into()],
             },