chore(tvix/store/protos): move (Root)Node into separate message r/5523

This is gonna get used in another place in a second.

Co-Authored-By: edef <edef@unfathomable.blue>
Change-Id: I347c11c8d24379628b7ed09d2c90670c576e686a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7617
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

2 files changed, 191 insertions, 124 deletions

diff --git a/tvix/store/protos/pathinfo.pb.go b/tvix/store/protos/pathinfo.pb.go
index 0bf50f0a5a..e06bbf97e4 100644
--- a/tvix/store/protos/pathinfo.pb.go
+++ b/tvix/store/protos/pathinfo.pb.go
@@ -75,7 +75,7 @@ func (x NARInfo_HashAlgo) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use NARInfo_HashAlgo.Descriptor instead.
 func (NARInfo_HashAlgo) EnumDescriptor() ([]byte, []int) {
-	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1, 0}
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{2, 0}
 }
 
 // PathInfo shows information about a Nix Store Path.
@@ -86,19 +86,13 @@ type PathInfo struct {
 	unknownFields protoimpl.UnknownFields
 
 	// The path can be a directory, file or symlink.
-	//
-	// Types that are assignable to Node:
-	//
-	//	*PathInfo_Directory
-	//	*PathInfo_File
-	//	*PathInfo_Symlink
-	Node isPathInfo_Node `protobuf_oneof:"node"`
+	Node *Node `protobuf:"bytes,1,opt,name=node,proto3" json:"node,omitempty"`
 	// List of references (output path hashes)
 	// This really is the raw *bytes*, after decoding nixbase32, and not a
 	// base32-encoded string.
-	References [][]byte `protobuf:"bytes,4,rep,name=references,proto3" json:"references,omitempty"`
+	References [][]byte `protobuf:"bytes,2,rep,name=references,proto3" json:"references,omitempty"`
 	// see below.
-	Narinfo *NARInfo `protobuf:"bytes,5,opt,name=narinfo,proto3" json:"narinfo,omitempty"`
+	Narinfo *NARInfo `protobuf:"bytes,3,opt,name=narinfo,proto3" json:"narinfo,omitempty"`
 }
 
 func (x *PathInfo) Reset() {
@@ -133,69 +127,121 @@ func (*PathInfo) Descriptor() ([]byte, []int) {
 	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{0}
 }
 
-func (m *PathInfo) GetNode() isPathInfo_Node {
-	if m != nil {
-		return m.Node
+func (x *PathInfo) GetNode() *Node {
+	if x != nil {
+		return x.Node
 	}
 	return nil
 }
 
-func (x *PathInfo) GetDirectory() *DirectoryNode {
-	if x, ok := x.GetNode().(*PathInfo_Directory); ok {
-		return x.Directory
+func (x *PathInfo) GetReferences() [][]byte {
+	if x != nil {
+		return x.References
 	}
 	return nil
 }
 
-func (x *PathInfo) GetFile() *FileNode {
-	if x, ok := x.GetNode().(*PathInfo_File); ok {
-		return x.File
+func (x *PathInfo) GetNarinfo() *NARInfo {
+	if x != nil {
+		return x.Narinfo
 	}
 	return nil
 }
 
-func (x *PathInfo) GetSymlink() *SymlinkNode {
-	if x, ok := x.GetNode().(*PathInfo_Symlink); ok {
-		return x.Symlink
+type Node struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Types that are assignable to Node:
+	//
+	//	*Node_Directory
+	//	*Node_File
+	//	*Node_Symlink
+	Node isNode_Node `protobuf_oneof:"node"`
+}
+
+func (x *Node) Reset() {
+	*x = Node{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Node) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Node) ProtoMessage() {}
+
+func (x *Node) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[1]
+	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 Node.ProtoReflect.Descriptor instead.
+func (*Node) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1}
+}
+
+func (m *Node) GetNode() isNode_Node {
+	if m != nil {
+		return m.Node
 	}
 	return nil
 }
 
-func (x *PathInfo) GetReferences() [][]byte {
-	if x != nil {
-		return x.References
+func (x *Node) GetDirectory() *DirectoryNode {
+	if x, ok := x.GetNode().(*Node_Directory); ok {
+		return x.Directory
 	}
 	return nil
 }
 
-func (x *PathInfo) GetNarinfo() *NARInfo {
-	if x != nil {
-		return x.Narinfo
+func (x *Node) GetFile() *FileNode {
+	if x, ok := x.GetNode().(*Node_File); ok {
+		return x.File
 	}
 	return nil
 }
 
-type isPathInfo_Node interface {
-	isPathInfo_Node()
+func (x *Node) GetSymlink() *SymlinkNode {
+	if x, ok := x.GetNode().(*Node_Symlink); ok {
+		return x.Symlink
+	}
+	return nil
 }
 
-type PathInfo_Directory struct {
+type isNode_Node interface {
+	isNode_Node()
+}
+
+type Node_Directory struct {
 	Directory *DirectoryNode `protobuf:"bytes,1,opt,name=directory,proto3,oneof"`
 }
 
-type PathInfo_File struct {
+type Node_File struct {
 	File *FileNode `protobuf:"bytes,2,opt,name=file,proto3,oneof"`
 }
 
-type PathInfo_Symlink struct {
+type Node_Symlink struct {
 	Symlink *SymlinkNode `protobuf:"bytes,3,opt,name=symlink,proto3,oneof"`
 }
 
-func (*PathInfo_Directory) isPathInfo_Node() {}
+func (*Node_Directory) isNode_Node() {}
 
-func (*PathInfo_File) isPathInfo_Node() {}
+func (*Node_File) isNode_Node() {}
 
-func (*PathInfo_Symlink) isPathInfo_Node() {}
+func (*Node_Symlink) isNode_Node() {}
 
 // Nix C++ uses NAR (Nix Archive) as a format to transfer store paths,
 // and stores metadata and signatures in NARInfo files.
@@ -228,7 +274,7 @@ type NARInfo struct {
 func (x *NARInfo) Reset() {
 	*x = NARInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[1]
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -241,7 +287,7 @@ func (x *NARInfo) String() string {
 func (*NARInfo) ProtoMessage() {}
 
 func (x *NARInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[1]
+	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -254,7 +300,7 @@ func (x *NARInfo) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use NARInfo.ProtoReflect.Descriptor instead.
 func (*NARInfo) Descriptor() ([]byte, []int) {
-	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1}
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{2}
 }
 
 func (x *NARInfo) GetNarSize() uint32 {
@@ -298,7 +344,7 @@ type NARInfo_NarHash struct {
 func (x *NARInfo_NarHash) Reset() {
 	*x = NARInfo_NarHash{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[2]
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -311,7 +357,7 @@ func (x *NARInfo_NarHash) String() string {
 func (*NARInfo_NarHash) ProtoMessage() {}
 
 func (x *NARInfo_NarHash) ProtoReflect() protoreflect.Message {
-	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[2]
+	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -324,7 +370,7 @@ func (x *NARInfo_NarHash) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use NARInfo_NarHash.ProtoReflect.Descriptor instead.
 func (*NARInfo_NarHash) Descriptor() ([]byte, []int) {
-	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1, 0}
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{2, 0}
 }
 
 func (x *NARInfo_NarHash) GetAlgo() NARInfo_HashAlgo {
@@ -354,7 +400,7 @@ type NARInfo_Signature struct {
 func (x *NARInfo_Signature) Reset() {
 	*x = NARInfo_Signature{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[3]
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -367,7 +413,7 @@ func (x *NARInfo_Signature) String() string {
 func (*NARInfo_Signature) ProtoMessage() {}
 
 func (x *NARInfo_Signature) ProtoReflect() protoreflect.Message {
-	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[3]
+	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -380,7 +426,7 @@ func (x *NARInfo_Signature) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use NARInfo_Signature.ProtoReflect.Descriptor instead.
 func (*NARInfo_Signature) Descriptor() ([]byte, []int) {
-	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1, 1}
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{2, 1}
 }
 
 func (x *NARInfo_Signature) GetName() string {
@@ -405,53 +451,56 @@ var file_tvix_store_protos_pathinfo_proto_rawDesc = []byte{
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+	0x41, 0x32, 0x35, 0x36, 0x10, 0x03, 0x12, 0x0a, 0x0a, 0x06, 0x53, 0x48, 0x41, 0x35, 0x31, 0x32,
+	0x10, 0x04, 0x42, 0x28, 0x5a, 0x26, 0x63, 0x6f, 0x64, 0x65, 0x2e, 0x74, 0x76, 0x6c, 0x2e, 0x66,
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+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -467,30 +516,32 @@ func file_tvix_store_protos_pathinfo_proto_rawDescGZIP() []byte {
 }
 
 var file_tvix_store_protos_pathinfo_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_tvix_store_protos_pathinfo_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_tvix_store_protos_pathinfo_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_tvix_store_protos_pathinfo_proto_goTypes = []interface{}{
 	(NARInfo_HashAlgo)(0),     // 0: tvix.store.v1.NARInfo.HashAlgo
 	(*PathInfo)(nil),          // 1: tvix.store.v1.PathInfo
-	(*NARInfo)(nil),           // 2: tvix.store.v1.NARInfo
-	(*NARInfo_NarHash)(nil),   // 3: tvix.store.v1.NARInfo.NarHash
-	(*NARInfo_Signature)(nil), // 4: tvix.store.v1.NARInfo.Signature
-	(*DirectoryNode)(nil),     // 5: tvix.store.v1.DirectoryNode
-	(*FileNode)(nil),          // 6: tvix.store.v1.FileNode
-	(*SymlinkNode)(nil),       // 7: tvix.store.v1.SymlinkNode
+	(*Node)(nil),              // 2: tvix.store.v1.Node
+	(*NARInfo)(nil),           // 3: tvix.store.v1.NARInfo
+	(*NARInfo_NarHash)(nil),   // 4: tvix.store.v1.NARInfo.NarHash
+	(*NARInfo_Signature)(nil), // 5: tvix.store.v1.NARInfo.Signature
+	(*DirectoryNode)(nil),     // 6: tvix.store.v1.DirectoryNode
+	(*FileNode)(nil),          // 7: tvix.store.v1.FileNode
+	(*SymlinkNode)(nil),       // 8: tvix.store.v1.SymlinkNode
 }
 var file_tvix_store_protos_pathinfo_proto_depIdxs = []int32{
-	5, // 0: tvix.store.v1.PathInfo.directory:type_name -> tvix.store.v1.DirectoryNode
-	6, // 1: tvix.store.v1.PathInfo.file:type_name -> tvix.store.v1.FileNode
-	7, // 2: tvix.store.v1.PathInfo.symlink:type_name -> tvix.store.v1.SymlinkNode
-	2, // 3: tvix.store.v1.PathInfo.narinfo:type_name -> tvix.store.v1.NARInfo
-	3, // 4: tvix.store.v1.NARInfo.nar_hashes:type_name -> tvix.store.v1.NARInfo.NarHash
-	4, // 5: tvix.store.v1.NARInfo.signatures:type_name -> tvix.store.v1.NARInfo.Signature
-	0, // 6: tvix.store.v1.NARInfo.NarHash.algo:type_name -> tvix.store.v1.NARInfo.HashAlgo
-	7, // [7:7] is the sub-list for method output_type
-	7, // [7:7] is the sub-list for method input_type
-	7, // [7:7] is the sub-list for extension type_name
-	7, // [7:7] is the sub-list for extension extendee
-	0, // [0:7] is the sub-list for field type_name
+	2, // 0: tvix.store.v1.PathInfo.node:type_name -> tvix.store.v1.Node
+	3, // 1: tvix.store.v1.PathInfo.narinfo:type_name -> tvix.store.v1.NARInfo
+	6, // 2: tvix.store.v1.Node.directory:type_name -> tvix.store.v1.DirectoryNode
+	7, // 3: tvix.store.v1.Node.file:type_name -> tvix.store.v1.FileNode
+	8, // 4: tvix.store.v1.Node.symlink:type_name -> tvix.store.v1.SymlinkNode
+	4, // 5: tvix.store.v1.NARInfo.nar_hashes:type_name -> tvix.store.v1.NARInfo.NarHash
+	5, // 6: tvix.store.v1.NARInfo.signatures:type_name -> tvix.store.v1.NARInfo.Signature
+	0, // 7: tvix.store.v1.NARInfo.NarHash.algo:type_name -> tvix.store.v1.NARInfo.HashAlgo
+	8, // [8:8] is the sub-list for method output_type
+	8, // [8:8] is the sub-list for method input_type
+	8, // [8:8] is the sub-list for extension type_name
+	8, // [8:8] is the sub-list for extension extendee
+	0, // [0:8] is the sub-list for field type_name
 }
 
 func init() { file_tvix_store_protos_pathinfo_proto_init() }
@@ -513,7 +564,7 @@ func file_tvix_store_protos_pathinfo_proto_init() {
 			}
 		}
 		file_tvix_store_protos_pathinfo_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*NARInfo); i {
+			switch v := v.(*Node); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -525,7 +576,7 @@ func file_tvix_store_protos_pathinfo_proto_init() {
 			}
 		}
 		file_tvix_store_protos_pathinfo_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*NARInfo_NarHash); i {
+			switch v := v.(*NARInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -537,6 +588,18 @@ func file_tvix_store_protos_pathinfo_proto_init() {
 			}
 		}
 		file_tvix_store_protos_pathinfo_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*NARInfo_NarHash); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_pathinfo_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*NARInfo_Signature); i {
 			case 0:
 				return &v.state
@@ -549,10 +612,10 @@ func file_tvix_store_protos_pathinfo_proto_init() {
 			}
 		}
 	}
-	file_tvix_store_protos_pathinfo_proto_msgTypes[0].OneofWrappers = []interface{}{
-		(*PathInfo_Directory)(nil),
-		(*PathInfo_File)(nil),
-		(*PathInfo_Symlink)(nil),
+	file_tvix_store_protos_pathinfo_proto_msgTypes[1].OneofWrappers = []interface{}{
+		(*Node_Directory)(nil),
+		(*Node_File)(nil),
+		(*Node_Symlink)(nil),
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -560,7 +623,7 @@ func file_tvix_store_protos_pathinfo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_tvix_store_protos_pathinfo_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   4,
+			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/tvix/store/protos/pathinfo.proto b/tvix/store/protos/pathinfo.proto
index 279bb14848..7a97026006 100644
--- a/tvix/store/protos/pathinfo.proto
+++ b/tvix/store/protos/pathinfo.proto
@@ -12,19 +12,23 @@ option go_package = "code.tvl.fyi/tvix/store/protos;storev1";
 // That's a single element inside /nix/store.
 message PathInfo {
     // The path can be a directory, file or symlink.
-    oneof node {
-        DirectoryNode directory = 1;
-        FileNode file = 2;
-        SymlinkNode symlink = 3;
-    }
+    Node node = 1;
 
     // List of references (output path hashes)
     // This really is the raw *bytes*, after decoding nixbase32, and not a
     // base32-encoded string.
-    repeated bytes references = 4;
+    repeated bytes references = 2;
 
     // see below.
-    NARInfo narinfo = 5;
+    NARInfo narinfo = 3;
+}
+
+message Node {
+    oneof node {
+        DirectoryNode directory = 1;
+        FileNode file = 2;
+        SymlinkNode symlink = 3;
+    }
 }
 
 // Nix C++ uses NAR (Nix Archive) as a format to transfer store paths,