feat(txix/store/protos): init go.mod, generate .pb.go files r/5496

This allows importing the generated .pb.go files into other go projects.

I initially looked at buildGo.protos, but it doesn't work for multi-.proto
files, and actually having LSP support for the generated structs is nice, too.

Change-Id: Idbd448008010790a10a0ea42e4059dbb609eaf1a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7322
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

9 files changed, 2390 insertions, 0 deletions

diff --git a/tvix/store/protos/castore.pb.go b/tvix/store/protos/castore.pb.go
new file mode 100644
index 0000000000..06e2d2e5a9
--- /dev/null
+++ b/tvix/store/protos/castore.pb.go
@@ -0,0 +1,450 @@
+// SPDX-FileCopyrightText: edef <edef@unfathomable.blue>
+// SPDX-License-Identifier: OSL-3.0 OR MIT OR Apache-2.0
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        (unknown)
+// source: tvix/store/protos/castore.proto
+
+package storev1
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// A Directory can contain Directory, File or Symlink nodes.
+// Each of these nodes have a name attribute, which is the basename in that directory
+// and node type specific attributes.
+// The name attribute:
+//   - MUST not contain slashes or null bytes
+//   - MUST not be '.' or '..'
+//   - MUST be unique across all three lists
+//
+// Elements in each list need to be lexicographically ordered by the name
+// attribute.
+type Directory struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Directories []*DirectoryNode `protobuf:"bytes,1,rep,name=directories,proto3" json:"directories,omitempty"`
+	Files       []*FileNode      `protobuf:"bytes,2,rep,name=files,proto3" json:"files,omitempty"`
+	Symlinks    []*SymlinkNode   `protobuf:"bytes,3,rep,name=symlinks,proto3" json:"symlinks,omitempty"`
+}
+
+func (x *Directory) Reset() {
+	*x = Directory{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_castore_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Directory) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Directory) ProtoMessage() {}
+
+func (x *Directory) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_castore_proto_msgTypes[0]
+	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 Directory.ProtoReflect.Descriptor instead.
+func (*Directory) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_castore_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Directory) GetDirectories() []*DirectoryNode {
+	if x != nil {
+		return x.Directories
+	}
+	return nil
+}
+
+func (x *Directory) GetFiles() []*FileNode {
+	if x != nil {
+		return x.Files
+	}
+	return nil
+}
+
+func (x *Directory) GetSymlinks() []*SymlinkNode {
+	if x != nil {
+		return x.Symlinks
+	}
+	return nil
+}
+
+// A DirectoryNode represents a directory in a Directory.
+type DirectoryNode struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The (base)name of the directory
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	// The blake3 hash of a Directory message, serialized in protobuf canonical form.
+	Digest []byte `protobuf:"bytes,2,opt,name=digest,proto3" json:"digest,omitempty"`
+	// Number of child elements in the Directory referred to by `digest`.
+	// Calculated by summing up the numbers of `directories`, `files` and
+	// `symlinks`, and for each directory, its size field. Used for inode
+	// number calculation.
+	// This field is precisely as verifiable as any other Merkle tree edge.
+	// Resolve `digest`, and you can compute it incrementally. Resolve the
+	// entire tree, and you can fully compute it from scratch.
+	// A credulous implementation won't reject an excessive size, but this is
+	// harmless: you'll have some ordinals without nodes. Undersizing is
+	// obvious and easy to reject: you won't have an ordinal for some nodes.
+	Size uint32 `protobuf:"varint,3,opt,name=size,proto3" json:"size,omitempty"`
+}
+
+func (x *DirectoryNode) Reset() {
+	*x = DirectoryNode{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_castore_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DirectoryNode) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DirectoryNode) ProtoMessage() {}
+
+func (x *DirectoryNode) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_castore_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 DirectoryNode.ProtoReflect.Descriptor instead.
+func (*DirectoryNode) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_castore_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *DirectoryNode) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *DirectoryNode) GetDigest() []byte {
+	if x != nil {
+		return x.Digest
+	}
+	return nil
+}
+
+func (x *DirectoryNode) GetSize() uint32 {
+	if x != nil {
+		return x.Size
+	}
+	return 0
+}
+
+// A FileNode represents a regular or executable file in a Directory.
+type FileNode struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The (base)name of the file
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	// The blake3 digest of the file contents
+	Digest []byte `protobuf:"bytes,2,opt,name=digest,proto3" json:"digest,omitempty"`
+	// The file content size
+	Size uint32 `protobuf:"varint,3,opt,name=size,proto3" json:"size,omitempty"`
+	// Whether the file is executable
+	Executable bool `protobuf:"varint,4,opt,name=executable,proto3" json:"executable,omitempty"`
+}
+
+func (x *FileNode) Reset() {
+	*x = FileNode{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_castore_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FileNode) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FileNode) ProtoMessage() {}
+
+func (x *FileNode) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_castore_proto_msgTypes[2]
+	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 FileNode.ProtoReflect.Descriptor instead.
+func (*FileNode) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_castore_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *FileNode) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *FileNode) GetDigest() []byte {
+	if x != nil {
+		return x.Digest
+	}
+	return nil
+}
+
+func (x *FileNode) GetSize() uint32 {
+	if x != nil {
+		return x.Size
+	}
+	return 0
+}
+
+func (x *FileNode) GetExecutable() bool {
+	if x != nil {
+		return x.Executable
+	}
+	return false
+}
+
+// A SymlinkNode represents a symbolic link in a Directory.
+type SymlinkNode struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The (base)name of the symlink
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	// The target of the symlink.
+	Target string `protobuf:"bytes,2,opt,name=target,proto3" json:"target,omitempty"`
+}
+
+func (x *SymlinkNode) Reset() {
+	*x = SymlinkNode{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_castore_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SymlinkNode) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SymlinkNode) ProtoMessage() {}
+
+func (x *SymlinkNode) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_castore_proto_msgTypes[3]
+	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 SymlinkNode.ProtoReflect.Descriptor instead.
+func (*SymlinkNode) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_castore_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *SymlinkNode) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *SymlinkNode) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+var File_tvix_store_protos_castore_proto protoreflect.FileDescriptor
+
+var file_tvix_store_protos_castore_proto_rawDesc = []byte{
+	0x0a, 0x1f, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f,
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+	0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x74, 0x61, 0x72, 0x67, 0x65, 0x74, 0x42, 0x28, 0x5a,
+	0x26, 0x63, 0x6f, 0x64, 0x65, 0x2e, 0x74, 0x76, 0x6c, 0x2e, 0x66, 0x79, 0x69, 0x2f, 0x74, 0x76,
+	0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x3b,
+	0x73, 0x74, 0x6f, 0x72, 0x65, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_tvix_store_protos_castore_proto_rawDescOnce sync.Once
+	file_tvix_store_protos_castore_proto_rawDescData = file_tvix_store_protos_castore_proto_rawDesc
+)
+
+func file_tvix_store_protos_castore_proto_rawDescGZIP() []byte {
+	file_tvix_store_protos_castore_proto_rawDescOnce.Do(func() {
+		file_tvix_store_protos_castore_proto_rawDescData = protoimpl.X.CompressGZIP(file_tvix_store_protos_castore_proto_rawDescData)
+	})
+	return file_tvix_store_protos_castore_proto_rawDescData
+}
+
+var file_tvix_store_protos_castore_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_tvix_store_protos_castore_proto_goTypes = []interface{}{
+	(*Directory)(nil),     // 0: tvix.store.v1.Directory
+	(*DirectoryNode)(nil), // 1: tvix.store.v1.DirectoryNode
+	(*FileNode)(nil),      // 2: tvix.store.v1.FileNode
+	(*SymlinkNode)(nil),   // 3: tvix.store.v1.SymlinkNode
+}
+var file_tvix_store_protos_castore_proto_depIdxs = []int32{
+	1, // 0: tvix.store.v1.Directory.directories:type_name -> tvix.store.v1.DirectoryNode
+	2, // 1: tvix.store.v1.Directory.files:type_name -> tvix.store.v1.FileNode
+	3, // 2: tvix.store.v1.Directory.symlinks:type_name -> tvix.store.v1.SymlinkNode
+	3, // [3:3] is the sub-list for method output_type
+	3, // [3:3] is the sub-list for method input_type
+	3, // [3:3] is the sub-list for extension type_name
+	3, // [3:3] is the sub-list for extension extendee
+	0, // [0:3] is the sub-list for field type_name
+}
+
+func init() { file_tvix_store_protos_castore_proto_init() }
+func file_tvix_store_protos_castore_proto_init() {
+	if File_tvix_store_protos_castore_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_tvix_store_protos_castore_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Directory); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_castore_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DirectoryNode); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_castore_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FileNode); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_castore_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SymlinkNode); 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{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_tvix_store_protos_castore_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_tvix_store_protos_castore_proto_goTypes,
+		DependencyIndexes: file_tvix_store_protos_castore_proto_depIdxs,
+		MessageInfos:      file_tvix_store_protos_castore_proto_msgTypes,
+	}.Build()
+	File_tvix_store_protos_castore_proto = out.File
+	file_tvix_store_protos_castore_proto_rawDesc = nil
+	file_tvix_store_protos_castore_proto_goTypes = nil
+	file_tvix_store_protos_castore_proto_depIdxs = nil
+}
diff --git a/tvix/store/protos/go.mod b/tvix/store/protos/go.mod
new file mode 100644
index 0000000000..6653f1a375
--- /dev/null
+++ b/tvix/store/protos/go.mod
@@ -0,0 +1,3 @@
+module code.tvl.fyi/tvix/store/protos
+
+go 1.19
diff --git a/tvix/store/protos/pathinfo.pb.go b/tvix/store/protos/pathinfo.pb.go
new file mode 100644
index 0000000000..0bf50f0a5a
--- /dev/null
+++ b/tvix/store/protos/pathinfo.pb.go
@@ -0,0 +1,576 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2022 The Tvix Authors
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        (unknown)
+// source: tvix/store/protos/pathinfo.proto
+
+package storev1
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type NARInfo_HashAlgo int32
+
+const (
+	NARInfo_UNKNOWN NARInfo_HashAlgo = 0
+	NARInfo_MD5     NARInfo_HashAlgo = 1
+	NARInfo_SHA1    NARInfo_HashAlgo = 2
+	NARInfo_SHA256  NARInfo_HashAlgo = 3
+	NARInfo_SHA512  NARInfo_HashAlgo = 4
+)
+
+// Enum value maps for NARInfo_HashAlgo.
+var (
+	NARInfo_HashAlgo_name = map[int32]string{
+		0: "UNKNOWN",
+		1: "MD5",
+		2: "SHA1",
+		3: "SHA256",
+		4: "SHA512",
+	}
+	NARInfo_HashAlgo_value = map[string]int32{
+		"UNKNOWN": 0,
+		"MD5":     1,
+		"SHA1":    2,
+		"SHA256":  3,
+		"SHA512":  4,
+	}
+)
+
+func (x NARInfo_HashAlgo) Enum() *NARInfo_HashAlgo {
+	p := new(NARInfo_HashAlgo)
+	*p = x
+	return p
+}
+
+func (x NARInfo_HashAlgo) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (NARInfo_HashAlgo) Descriptor() protoreflect.EnumDescriptor {
+	return file_tvix_store_protos_pathinfo_proto_enumTypes[0].Descriptor()
+}
+
+func (NARInfo_HashAlgo) Type() protoreflect.EnumType {
+	return &file_tvix_store_protos_pathinfo_proto_enumTypes[0]
+}
+
+func (x NARInfo_HashAlgo) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use NARInfo_HashAlgo.Descriptor instead.
+func (NARInfo_HashAlgo) EnumDescriptor() ([]byte, []int) {
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1, 0}
+}
+
+// PathInfo shows information about a Nix Store Path.
+// That's a single element inside /nix/store.
+type PathInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	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"`
+	// 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"`
+	// see below.
+	Narinfo *NARInfo `protobuf:"bytes,5,opt,name=narinfo,proto3" json:"narinfo,omitempty"`
+}
+
+func (x *PathInfo) Reset() {
+	*x = PathInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PathInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PathInfo) ProtoMessage() {}
+
+func (x *PathInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[0]
+	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 PathInfo.ProtoReflect.Descriptor instead.
+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
+	}
+	return nil
+}
+
+func (x *PathInfo) GetDirectory() *DirectoryNode {
+	if x, ok := x.GetNode().(*PathInfo_Directory); ok {
+		return x.Directory
+	}
+	return nil
+}
+
+func (x *PathInfo) GetFile() *FileNode {
+	if x, ok := x.GetNode().(*PathInfo_File); ok {
+		return x.File
+	}
+	return nil
+}
+
+func (x *PathInfo) GetSymlink() *SymlinkNode {
+	if x, ok := x.GetNode().(*PathInfo_Symlink); ok {
+		return x.Symlink
+	}
+	return nil
+}
+
+func (x *PathInfo) GetReferences() [][]byte {
+	if x != nil {
+		return x.References
+	}
+	return nil
+}
+
+func (x *PathInfo) GetNarinfo() *NARInfo {
+	if x != nil {
+		return x.Narinfo
+	}
+	return nil
+}
+
+type isPathInfo_Node interface {
+	isPathInfo_Node()
+}
+
+type PathInfo_Directory struct {
+	Directory *DirectoryNode `protobuf:"bytes,1,opt,name=directory,proto3,oneof"`
+}
+
+type PathInfo_File struct {
+	File *FileNode `protobuf:"bytes,2,opt,name=file,proto3,oneof"`
+}
+
+type PathInfo_Symlink struct {
+	Symlink *SymlinkNode `protobuf:"bytes,3,opt,name=symlink,proto3,oneof"`
+}
+
+func (*PathInfo_Directory) isPathInfo_Node() {}
+
+func (*PathInfo_File) isPathInfo_Node() {}
+
+func (*PathInfo_Symlink) isPathInfo_Node() {}
+
+// Nix C++ uses NAR (Nix Archive) as a format to transfer store paths,
+// and stores metadata and signatures in NARInfo files.
+// Store all these attributes in a separate message.
+//
+// This is useful to render .narinfo files to clients, or to preserve/validate
+// these signatures.
+// As verifying these signatures requires the whole NAR file to be synthesized,
+// moving to another signature scheme is desired.
+// Even then, it still makes sense to hold this data, for old clients.
+type NARInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// This size of the NAR file, in bytes.
+	NarSize uint32 `protobuf:"varint,1,opt,name=nar_size,json=narSize,proto3" json:"nar_size,omitempty"`
+	// The hash(es) of a NAR file.
+	NarHashes []*NARInfo_NarHash `protobuf:"bytes,2,rep,name=nar_hashes,json=narHashes,proto3" json:"nar_hashes,omitempty"`
+	// The signatures in a .narinfo file.
+	Signatures []*NARInfo_Signature `protobuf:"bytes,3,rep,name=signatures,proto3" json:"signatures,omitempty"`
+	// A list of references. To validate .narinfo signatures, a fingerprint
+	// needs to be constructed.
+	// This fingerprint doesn't just contain the hashes of the output paths of
+	// all references (like PathInfo.references), but their whole (base)names,
+	// so we need to keep them somewhere.
+	ReferenceNames []string `protobuf:"bytes,4,rep,name=reference_names,json=referenceNames,proto3" json:"reference_names,omitempty"`
+}
+
+func (x *NARInfo) Reset() {
+	*x = NARInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NARInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NARInfo) ProtoMessage() {}
+
+func (x *NARInfo) 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 NARInfo.ProtoReflect.Descriptor instead.
+func (*NARInfo) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *NARInfo) GetNarSize() uint32 {
+	if x != nil {
+		return x.NarSize
+	}
+	return 0
+}
+
+func (x *NARInfo) GetNarHashes() []*NARInfo_NarHash {
+	if x != nil {
+		return x.NarHashes
+	}
+	return nil
+}
+
+func (x *NARInfo) GetSignatures() []*NARInfo_Signature {
+	if x != nil {
+		return x.Signatures
+	}
+	return nil
+}
+
+func (x *NARInfo) GetReferenceNames() []string {
+	if x != nil {
+		return x.ReferenceNames
+	}
+	return nil
+}
+
+// The hash of the NAR file.
+type NARInfo_NarHash struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Algo   NARInfo_HashAlgo `protobuf:"varint,1,opt,name=algo,proto3,enum=tvix.store.v1.NARInfo_HashAlgo" json:"algo,omitempty"`
+	Digest []byte           `protobuf:"bytes,2,opt,name=digest,proto3" json:"digest,omitempty"`
+}
+
+func (x *NARInfo_NarHash) Reset() {
+	*x = NARInfo_NarHash{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NARInfo_NarHash) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NARInfo_NarHash) ProtoMessage() {}
+
+func (x *NARInfo_NarHash) ProtoReflect() protoreflect.Message {
+	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 {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use NARInfo_NarHash.ProtoReflect.Descriptor instead.
+func (*NARInfo_NarHash) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1, 0}
+}
+
+func (x *NARInfo_NarHash) GetAlgo() NARInfo_HashAlgo {
+	if x != nil {
+		return x.Algo
+	}
+	return NARInfo_UNKNOWN
+}
+
+func (x *NARInfo_NarHash) GetDigest() []byte {
+	if x != nil {
+		return x.Digest
+	}
+	return nil
+}
+
+// This represents a (parsed) signature line in a .narinfo file.
+type NARInfo_Signature struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Data []byte `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (x *NARInfo_Signature) Reset() {
+	*x = NARInfo_Signature{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_pathinfo_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NARInfo_Signature) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NARInfo_Signature) ProtoMessage() {}
+
+func (x *NARInfo_Signature) ProtoReflect() protoreflect.Message {
+	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 {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use NARInfo_Signature.ProtoReflect.Descriptor instead.
+func (*NARInfo_Signature) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_pathinfo_proto_rawDescGZIP(), []int{1, 1}
+}
+
+func (x *NARInfo_Signature) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *NARInfo_Signature) GetData() []byte {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+var File_tvix_store_protos_pathinfo_proto protoreflect.FileDescriptor
+
+var file_tvix_store_protos_pathinfo_proto_rawDesc = []byte{
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+	0x2f, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x73, 0x3b, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
+}
+
+var (
+	file_tvix_store_protos_pathinfo_proto_rawDescOnce sync.Once
+	file_tvix_store_protos_pathinfo_proto_rawDescData = file_tvix_store_protos_pathinfo_proto_rawDesc
+)
+
+func file_tvix_store_protos_pathinfo_proto_rawDescGZIP() []byte {
+	file_tvix_store_protos_pathinfo_proto_rawDescOnce.Do(func() {
+		file_tvix_store_protos_pathinfo_proto_rawDescData = protoimpl.X.CompressGZIP(file_tvix_store_protos_pathinfo_proto_rawDescData)
+	})
+	return file_tvix_store_protos_pathinfo_proto_rawDescData
+}
+
+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_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
+}
+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
+}
+
+func init() { file_tvix_store_protos_pathinfo_proto_init() }
+func file_tvix_store_protos_pathinfo_proto_init() {
+	if File_tvix_store_protos_pathinfo_proto != nil {
+		return
+	}
+	file_tvix_store_protos_castore_proto_init()
+	if !protoimpl.UnsafeEnabled {
+		file_tvix_store_protos_pathinfo_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PathInfo); 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[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*NARInfo); 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[2].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[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*NARInfo_Signature); 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[0].OneofWrappers = []interface{}{
+		(*PathInfo_Directory)(nil),
+		(*PathInfo_File)(nil),
+		(*PathInfo_Symlink)(nil),
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_tvix_store_protos_pathinfo_proto_rawDesc,
+			NumEnums:      1,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_tvix_store_protos_pathinfo_proto_goTypes,
+		DependencyIndexes: file_tvix_store_protos_pathinfo_proto_depIdxs,
+		EnumInfos:         file_tvix_store_protos_pathinfo_proto_enumTypes,
+		MessageInfos:      file_tvix_store_protos_pathinfo_proto_msgTypes,
+	}.Build()
+	File_tvix_store_protos_pathinfo_proto = out.File
+	file_tvix_store_protos_pathinfo_proto_rawDesc = nil
+	file_tvix_store_protos_pathinfo_proto_goTypes = nil
+	file_tvix_store_protos_pathinfo_proto_depIdxs = nil
+}
diff --git a/tvix/store/protos/rpc_blobstore.pb.go b/tvix/store/protos/rpc_blobstore.pb.go
new file mode 100644
index 0000000000..11adf26cdf
--- /dev/null
+++ b/tvix/store/protos/rpc_blobstore.pb.go
@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2022 The Tvix Authors
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        (unknown)
+// source: tvix/store/protos/rpc_blobstore.proto
+
+package storev1
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type GetBlobRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The blake3 digest of the blob requested
+	Digest []byte `protobuf:"bytes,1,opt,name=digest,proto3" json:"digest,omitempty"`
+}
+
+func (x *GetBlobRequest) Reset() {
+	*x = GetBlobRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetBlobRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetBlobRequest) ProtoMessage() {}
+
+func (x *GetBlobRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[0]
+	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 GetBlobRequest.ProtoReflect.Descriptor instead.
+func (*GetBlobRequest) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_blobstore_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *GetBlobRequest) GetDigest() []byte {
+	if x != nil {
+		return x.Digest
+	}
+	return nil
+}
+
+type GetBlobResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Data []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (x *GetBlobResponse) Reset() {
+	*x = GetBlobResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetBlobResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetBlobResponse) ProtoMessage() {}
+
+func (x *GetBlobResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_blobstore_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 GetBlobResponse.ProtoReflect.Descriptor instead.
+func (*GetBlobResponse) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_blobstore_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *GetBlobResponse) GetData() []byte {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+type PutBlobRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Data []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (x *PutBlobRequest) Reset() {
+	*x = PutBlobRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PutBlobRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PutBlobRequest) ProtoMessage() {}
+
+func (x *PutBlobRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[2]
+	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 PutBlobRequest.ProtoReflect.Descriptor instead.
+func (*PutBlobRequest) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_blobstore_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *PutBlobRequest) GetData() []byte {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+type PutBlobResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The blake3 digest of the data that was sent.
+	Digest []byte `protobuf:"bytes,1,opt,name=digest,proto3" json:"digest,omitempty"`
+}
+
+func (x *PutBlobResponse) Reset() {
+	*x = PutBlobResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PutBlobResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PutBlobResponse) ProtoMessage() {}
+
+func (x *PutBlobResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_blobstore_proto_msgTypes[3]
+	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 PutBlobResponse.ProtoReflect.Descriptor instead.
+func (*PutBlobResponse) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_blobstore_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *PutBlobResponse) GetDigest() []byte {
+	if x != nil {
+		return x.Digest
+	}
+	return nil
+}
+
+var File_tvix_store_protos_rpc_blobstore_proto protoreflect.FileDescriptor
+
+var file_tvix_store_protos_rpc_blobstore_proto_rawDesc = []byte{
+	0x0a, 0x25, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x73, 0x2f, 0x72, 0x70, 0x63, 0x5f, 0x62, 0x6c, 0x6f, 0x62, 0x73, 0x74, 0x6f, 0x72,
+	0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0d, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74,
+	0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x22, 0x28, 0x0a, 0x0e, 0x47, 0x65, 0x74, 0x42, 0x6c, 0x6f,
+	0x62, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x16, 0x0a, 0x06, 0x64, 0x69, 0x67, 0x65,
+	0x73, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x06, 0x64, 0x69, 0x67, 0x65, 0x73, 0x74,
+	0x22, 0x25, 0x0a, 0x0f, 0x47, 0x65, 0x74, 0x42, 0x6c, 0x6f, 0x62, 0x52, 0x65, 0x73, 0x70, 0x6f,
+	0x6e, 0x73, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x0c, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x22, 0x24, 0x0a, 0x0e, 0x50, 0x75, 0x74, 0x42, 0x6c,
+	0x6f, 0x62, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x64, 0x61, 0x74,
+	0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61, 0x22, 0x29, 0x0a,
+	0x0f, 0x50, 0x75, 0x74, 0x42, 0x6c, 0x6f, 0x62, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
+	0x12, 0x16, 0x0a, 0x06, 0x64, 0x69, 0x67, 0x65, 0x73, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c,
+	0x52, 0x06, 0x64, 0x69, 0x67, 0x65, 0x73, 0x74, 0x32, 0x99, 0x01, 0x0a, 0x0b, 0x42, 0x6c, 0x6f,
+	0x62, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x12, 0x44, 0x0a, 0x03, 0x47, 0x65, 0x74, 0x12,
+	0x1d, 0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e,
+	0x47, 0x65, 0x74, 0x42, 0x6c, 0x6f, 0x62, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x1e,
+	0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x47,
+	0x65, 0x74, 0x42, 0x6c, 0x6f, 0x62, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x44,
+	0x0a, 0x03, 0x50, 0x75, 0x74, 0x12, 0x1d, 0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f,
+	0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x50, 0x75, 0x74, 0x42, 0x6c, 0x6f, 0x62, 0x52, 0x65, 0x71,
+	0x75, 0x65, 0x73, 0x74, 0x1a, 0x1e, 0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72,
+	0x65, 0x2e, 0x76, 0x31, 0x2e, 0x50, 0x75, 0x74, 0x42, 0x6c, 0x6f, 0x62, 0x52, 0x65, 0x73, 0x70,
+	0x6f, 0x6e, 0x73, 0x65, 0x42, 0x28, 0x5a, 0x26, 0x63, 0x6f, 0x64, 0x65, 0x2e, 0x74, 0x76, 0x6c,
+	0x2e, 0x66, 0x79, 0x69, 0x2f, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x3b, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x76, 0x31, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_tvix_store_protos_rpc_blobstore_proto_rawDescOnce sync.Once
+	file_tvix_store_protos_rpc_blobstore_proto_rawDescData = file_tvix_store_protos_rpc_blobstore_proto_rawDesc
+)
+
+func file_tvix_store_protos_rpc_blobstore_proto_rawDescGZIP() []byte {
+	file_tvix_store_protos_rpc_blobstore_proto_rawDescOnce.Do(func() {
+		file_tvix_store_protos_rpc_blobstore_proto_rawDescData = protoimpl.X.CompressGZIP(file_tvix_store_protos_rpc_blobstore_proto_rawDescData)
+	})
+	return file_tvix_store_protos_rpc_blobstore_proto_rawDescData
+}
+
+var file_tvix_store_protos_rpc_blobstore_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_tvix_store_protos_rpc_blobstore_proto_goTypes = []interface{}{
+	(*GetBlobRequest)(nil),  // 0: tvix.store.v1.GetBlobRequest
+	(*GetBlobResponse)(nil), // 1: tvix.store.v1.GetBlobResponse
+	(*PutBlobRequest)(nil),  // 2: tvix.store.v1.PutBlobRequest
+	(*PutBlobResponse)(nil), // 3: tvix.store.v1.PutBlobResponse
+}
+var file_tvix_store_protos_rpc_blobstore_proto_depIdxs = []int32{
+	0, // 0: tvix.store.v1.BlobService.Get:input_type -> tvix.store.v1.GetBlobRequest
+	2, // 1: tvix.store.v1.BlobService.Put:input_type -> tvix.store.v1.PutBlobRequest
+	1, // 2: tvix.store.v1.BlobService.Get:output_type -> tvix.store.v1.GetBlobResponse
+	3, // 3: tvix.store.v1.BlobService.Put:output_type -> tvix.store.v1.PutBlobResponse
+	2, // [2:4] is the sub-list for method output_type
+	0, // [0:2] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_tvix_store_protos_rpc_blobstore_proto_init() }
+func file_tvix_store_protos_rpc_blobstore_proto_init() {
+	if File_tvix_store_protos_rpc_blobstore_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_tvix_store_protos_rpc_blobstore_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetBlobRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_rpc_blobstore_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetBlobResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_rpc_blobstore_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PutBlobRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_rpc_blobstore_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PutBlobResponse); 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{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_tvix_store_protos_rpc_blobstore_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_tvix_store_protos_rpc_blobstore_proto_goTypes,
+		DependencyIndexes: file_tvix_store_protos_rpc_blobstore_proto_depIdxs,
+		MessageInfos:      file_tvix_store_protos_rpc_blobstore_proto_msgTypes,
+	}.Build()
+	File_tvix_store_protos_rpc_blobstore_proto = out.File
+	file_tvix_store_protos_rpc_blobstore_proto_rawDesc = nil
+	file_tvix_store_protos_rpc_blobstore_proto_goTypes = nil
+	file_tvix_store_protos_rpc_blobstore_proto_depIdxs = nil
+}
diff --git a/tvix/store/protos/rpc_blobstore_grpc.pb.go b/tvix/store/protos/rpc_blobstore_grpc.pb.go
new file mode 100644
index 0000000000..51b5aea95f
--- /dev/null
+++ b/tvix/store/protos/rpc_blobstore_grpc.pb.go
@@ -0,0 +1,141 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             (unknown)
+// source: tvix/store/protos/rpc_blobstore.proto
+
+package storev1
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// BlobServiceClient is the client API for BlobService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type BlobServiceClient interface {
+	Get(ctx context.Context, in *GetBlobRequest, opts ...grpc.CallOption) (*GetBlobResponse, error)
+	Put(ctx context.Context, in *PutBlobRequest, opts ...grpc.CallOption) (*PutBlobResponse, error)
+}
+
+type blobServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewBlobServiceClient(cc grpc.ClientConnInterface) BlobServiceClient {
+	return &blobServiceClient{cc}
+}
+
+func (c *blobServiceClient) Get(ctx context.Context, in *GetBlobRequest, opts ...grpc.CallOption) (*GetBlobResponse, error) {
+	out := new(GetBlobResponse)
+	err := c.cc.Invoke(ctx, "/tvix.store.v1.BlobService/Get", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *blobServiceClient) Put(ctx context.Context, in *PutBlobRequest, opts ...grpc.CallOption) (*PutBlobResponse, error) {
+	out := new(PutBlobResponse)
+	err := c.cc.Invoke(ctx, "/tvix.store.v1.BlobService/Put", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// BlobServiceServer is the server API for BlobService service.
+// All implementations must embed UnimplementedBlobServiceServer
+// for forward compatibility
+type BlobServiceServer interface {
+	Get(context.Context, *GetBlobRequest) (*GetBlobResponse, error)
+	Put(context.Context, *PutBlobRequest) (*PutBlobResponse, error)
+	mustEmbedUnimplementedBlobServiceServer()
+}
+
+// UnimplementedBlobServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedBlobServiceServer struct {
+}
+
+func (UnimplementedBlobServiceServer) Get(context.Context, *GetBlobRequest) (*GetBlobResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Get not implemented")
+}
+func (UnimplementedBlobServiceServer) Put(context.Context, *PutBlobRequest) (*PutBlobResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Put not implemented")
+}
+func (UnimplementedBlobServiceServer) mustEmbedUnimplementedBlobServiceServer() {}
+
+// UnsafeBlobServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to BlobServiceServer will
+// result in compilation errors.
+type UnsafeBlobServiceServer interface {
+	mustEmbedUnimplementedBlobServiceServer()
+}
+
+func RegisterBlobServiceServer(s grpc.ServiceRegistrar, srv BlobServiceServer) {
+	s.RegisterService(&BlobService_ServiceDesc, srv)
+}
+
+func _BlobService_Get_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetBlobRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(BlobServiceServer).Get(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tvix.store.v1.BlobService/Get",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(BlobServiceServer).Get(ctx, req.(*GetBlobRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _BlobService_Put_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PutBlobRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(BlobServiceServer).Put(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tvix.store.v1.BlobService/Put",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(BlobServiceServer).Put(ctx, req.(*PutBlobRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// BlobService_ServiceDesc is the grpc.ServiceDesc for BlobService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var BlobService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "tvix.store.v1.BlobService",
+	HandlerType: (*BlobServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Get",
+			Handler:    _BlobService_Get_Handler,
+		},
+		{
+			MethodName: "Put",
+			Handler:    _BlobService_Put_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "tvix/store/protos/rpc_blobstore.proto",
+}
diff --git a/tvix/store/protos/rpc_directory.pb.go b/tvix/store/protos/rpc_directory.pb.go
new file mode 100644
index 0000000000..03e93fd56b
--- /dev/null
+++ b/tvix/store/protos/rpc_directory.pb.go
@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2022 The Tvix Authors
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        (unknown)
+// source: tvix/store/protos/rpc_directory.proto
+
+package storev1
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type GetDirectoryRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Types that are assignable to ByWhat:
+	//
+	//	*GetDirectoryRequest_Digest
+	ByWhat isGetDirectoryRequest_ByWhat `protobuf_oneof:"by_what"`
+	// If set to true, recursively resolve all child Directory messages.
+	// Directory messages SHOULD be streamed in a recursive breadth-first walk,
+	// but other orders are also fine, as long as Directory messages are only
+	// sent after they are referred to from previously sent Directory messages.
+	Recursive bool `protobuf:"varint,2,opt,name=recursive,proto3" json:"recursive,omitempty"`
+}
+
+func (x *GetDirectoryRequest) Reset() {
+	*x = GetDirectoryRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_directory_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetDirectoryRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetDirectoryRequest) ProtoMessage() {}
+
+func (x *GetDirectoryRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_directory_proto_msgTypes[0]
+	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 GetDirectoryRequest.ProtoReflect.Descriptor instead.
+func (*GetDirectoryRequest) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_directory_proto_rawDescGZIP(), []int{0}
+}
+
+func (m *GetDirectoryRequest) GetByWhat() isGetDirectoryRequest_ByWhat {
+	if m != nil {
+		return m.ByWhat
+	}
+	return nil
+}
+
+func (x *GetDirectoryRequest) GetDigest() []byte {
+	if x, ok := x.GetByWhat().(*GetDirectoryRequest_Digest); ok {
+		return x.Digest
+	}
+	return nil
+}
+
+func (x *GetDirectoryRequest) GetRecursive() bool {
+	if x != nil {
+		return x.Recursive
+	}
+	return false
+}
+
+type isGetDirectoryRequest_ByWhat interface {
+	isGetDirectoryRequest_ByWhat()
+}
+
+type GetDirectoryRequest_Digest struct {
+	// The blake3 hash of the (root) Directory message, serialized in
+	// protobuf canonical form.
+	// Keep in mind this can be a subtree of another root.
+	Digest []byte `protobuf:"bytes,1,opt,name=digest,proto3,oneof"`
+}
+
+func (*GetDirectoryRequest_Digest) isGetDirectoryRequest_ByWhat() {}
+
+type PutDirectoryResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	RootDigest []byte `protobuf:"bytes,1,opt,name=root_digest,json=rootDigest,proto3" json:"root_digest,omitempty"`
+}
+
+func (x *PutDirectoryResponse) Reset() {
+	*x = PutDirectoryResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_directory_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PutDirectoryResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PutDirectoryResponse) ProtoMessage() {}
+
+func (x *PutDirectoryResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_directory_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 PutDirectoryResponse.ProtoReflect.Descriptor instead.
+func (*PutDirectoryResponse) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_directory_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *PutDirectoryResponse) GetRootDigest() []byte {
+	if x != nil {
+		return x.RootDigest
+	}
+	return nil
+}
+
+var File_tvix_store_protos_rpc_directory_proto protoreflect.FileDescriptor
+
+var file_tvix_store_protos_rpc_directory_proto_rawDesc = []byte{
+	0x0a, 0x25, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f,
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+	0x74, 0x22, 0x37, 0x0a, 0x14, 0x50, 0x75, 0x74, 0x44, 0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72,
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+	0x74, 0x5f, 0x64, 0x69, 0x67, 0x65, 0x73, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x0a,
+	0x72, 0x6f, 0x6f, 0x74, 0x44, 0x69, 0x67, 0x65, 0x73, 0x74, 0x32, 0xa1, 0x01, 0x0a, 0x10, 0x44,
+	0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x12,
+	0x45, 0x0a, 0x03, 0x47, 0x65, 0x74, 0x12, 0x22, 0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74,
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+	0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x44, 0x69,
+	0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x1a, 0x23, 0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73,
+	0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x50, 0x75, 0x74, 0x44, 0x69, 0x72, 0x65, 0x63,
+	0x74, 0x6f, 0x72, 0x79, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x28, 0x01, 0x42, 0x28,
+	0x5a, 0x26, 0x63, 0x6f, 0x64, 0x65, 0x2e, 0x74, 0x76, 0x6c, 0x2e, 0x66, 0x79, 0x69, 0x2f, 0x74,
+	0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73,
+	0x3b, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_tvix_store_protos_rpc_directory_proto_rawDescOnce sync.Once
+	file_tvix_store_protos_rpc_directory_proto_rawDescData = file_tvix_store_protos_rpc_directory_proto_rawDesc
+)
+
+func file_tvix_store_protos_rpc_directory_proto_rawDescGZIP() []byte {
+	file_tvix_store_protos_rpc_directory_proto_rawDescOnce.Do(func() {
+		file_tvix_store_protos_rpc_directory_proto_rawDescData = protoimpl.X.CompressGZIP(file_tvix_store_protos_rpc_directory_proto_rawDescData)
+	})
+	return file_tvix_store_protos_rpc_directory_proto_rawDescData
+}
+
+var file_tvix_store_protos_rpc_directory_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_tvix_store_protos_rpc_directory_proto_goTypes = []interface{}{
+	(*GetDirectoryRequest)(nil),  // 0: tvix.store.v1.GetDirectoryRequest
+	(*PutDirectoryResponse)(nil), // 1: tvix.store.v1.PutDirectoryResponse
+	(*Directory)(nil),            // 2: tvix.store.v1.Directory
+}
+var file_tvix_store_protos_rpc_directory_proto_depIdxs = []int32{
+	0, // 0: tvix.store.v1.DirectoryService.Get:input_type -> tvix.store.v1.GetDirectoryRequest
+	2, // 1: tvix.store.v1.DirectoryService.Put:input_type -> tvix.store.v1.Directory
+	2, // 2: tvix.store.v1.DirectoryService.Get:output_type -> tvix.store.v1.Directory
+	1, // 3: tvix.store.v1.DirectoryService.Put:output_type -> tvix.store.v1.PutDirectoryResponse
+	2, // [2:4] is the sub-list for method output_type
+	0, // [0:2] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_tvix_store_protos_rpc_directory_proto_init() }
+func file_tvix_store_protos_rpc_directory_proto_init() {
+	if File_tvix_store_protos_rpc_directory_proto != nil {
+		return
+	}
+	file_tvix_store_protos_castore_proto_init()
+	if !protoimpl.UnsafeEnabled {
+		file_tvix_store_protos_rpc_directory_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetDirectoryRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_tvix_store_protos_rpc_directory_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PutDirectoryResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	file_tvix_store_protos_rpc_directory_proto_msgTypes[0].OneofWrappers = []interface{}{
+		(*GetDirectoryRequest_Digest)(nil),
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_tvix_store_protos_rpc_directory_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_tvix_store_protos_rpc_directory_proto_goTypes,
+		DependencyIndexes: file_tvix_store_protos_rpc_directory_proto_depIdxs,
+		MessageInfos:      file_tvix_store_protos_rpc_directory_proto_msgTypes,
+	}.Build()
+	File_tvix_store_protos_rpc_directory_proto = out.File
+	file_tvix_store_protos_rpc_directory_proto_rawDesc = nil
+	file_tvix_store_protos_rpc_directory_proto_goTypes = nil
+	file_tvix_store_protos_rpc_directory_proto_depIdxs = nil
+}
diff --git a/tvix/store/protos/rpc_directory_grpc.pb.go b/tvix/store/protos/rpc_directory_grpc.pb.go
new file mode 100644
index 0000000000..88007c5a91
--- /dev/null
+++ b/tvix/store/protos/rpc_directory_grpc.pb.go
@@ -0,0 +1,230 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             (unknown)
+// source: tvix/store/protos/rpc_directory.proto
+
+package storev1
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// DirectoryServiceClient is the client API for DirectoryService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type DirectoryServiceClient interface {
+	// Get retrieves a stream of Directory messages, by using the lookup
+	// parameters in GetDirectoryRequest.
+	// Keep in mind multiple DirectoryNodes in different parts of the graph might
+	// have the same digest if they have the same underlying contents,
+	// so sending subsequent ones can be omitted.
+	Get(ctx context.Context, in *GetDirectoryRequest, opts ...grpc.CallOption) (DirectoryService_GetClient, error)
+	// Put uploads a graph of Directory messages.
+	// Individual Directory messages need to be send in an order walking up
+	// from the leaves to the root - a Directory message can only refer to
+	// Directory messages previously sent in the same stream.
+	// Keep in mind multiple DirectoryNodes in different parts of the graph might
+	// have the same digest if they have the same underlying contents,
+	// so sending subsequent ones can be omitted.
+	// We might add a separate method, allowing to send partial graphs at a later
+	// time, if requiring to send the full graph turns out to be a problem.
+	Put(ctx context.Context, opts ...grpc.CallOption) (DirectoryService_PutClient, error)
+}
+
+type directoryServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewDirectoryServiceClient(cc grpc.ClientConnInterface) DirectoryServiceClient {
+	return &directoryServiceClient{cc}
+}
+
+func (c *directoryServiceClient) Get(ctx context.Context, in *GetDirectoryRequest, opts ...grpc.CallOption) (DirectoryService_GetClient, error) {
+	stream, err := c.cc.NewStream(ctx, &DirectoryService_ServiceDesc.Streams[0], "/tvix.store.v1.DirectoryService/Get", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &directoryServiceGetClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type DirectoryService_GetClient interface {
+	Recv() (*Directory, error)
+	grpc.ClientStream
+}
+
+type directoryServiceGetClient struct {
+	grpc.ClientStream
+}
+
+func (x *directoryServiceGetClient) Recv() (*Directory, error) {
+	m := new(Directory)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+func (c *directoryServiceClient) Put(ctx context.Context, opts ...grpc.CallOption) (DirectoryService_PutClient, error) {
+	stream, err := c.cc.NewStream(ctx, &DirectoryService_ServiceDesc.Streams[1], "/tvix.store.v1.DirectoryService/Put", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &directoryServicePutClient{stream}
+	return x, nil
+}
+
+type DirectoryService_PutClient interface {
+	Send(*Directory) error
+	CloseAndRecv() (*PutDirectoryResponse, error)
+	grpc.ClientStream
+}
+
+type directoryServicePutClient struct {
+	grpc.ClientStream
+}
+
+func (x *directoryServicePutClient) Send(m *Directory) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *directoryServicePutClient) CloseAndRecv() (*PutDirectoryResponse, error) {
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	m := new(PutDirectoryResponse)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// DirectoryServiceServer is the server API for DirectoryService service.
+// All implementations must embed UnimplementedDirectoryServiceServer
+// for forward compatibility
+type DirectoryServiceServer interface {
+	// Get retrieves a stream of Directory messages, by using the lookup
+	// parameters in GetDirectoryRequest.
+	// Keep in mind multiple DirectoryNodes in different parts of the graph might
+	// have the same digest if they have the same underlying contents,
+	// so sending subsequent ones can be omitted.
+	Get(*GetDirectoryRequest, DirectoryService_GetServer) error
+	// Put uploads a graph of Directory messages.
+	// Individual Directory messages need to be send in an order walking up
+	// from the leaves to the root - a Directory message can only refer to
+	// Directory messages previously sent in the same stream.
+	// Keep in mind multiple DirectoryNodes in different parts of the graph might
+	// have the same digest if they have the same underlying contents,
+	// so sending subsequent ones can be omitted.
+	// We might add a separate method, allowing to send partial graphs at a later
+	// time, if requiring to send the full graph turns out to be a problem.
+	Put(DirectoryService_PutServer) error
+	mustEmbedUnimplementedDirectoryServiceServer()
+}
+
+// UnimplementedDirectoryServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedDirectoryServiceServer struct {
+}
+
+func (UnimplementedDirectoryServiceServer) Get(*GetDirectoryRequest, DirectoryService_GetServer) error {
+	return status.Errorf(codes.Unimplemented, "method Get not implemented")
+}
+func (UnimplementedDirectoryServiceServer) Put(DirectoryService_PutServer) error {
+	return status.Errorf(codes.Unimplemented, "method Put not implemented")
+}
+func (UnimplementedDirectoryServiceServer) mustEmbedUnimplementedDirectoryServiceServer() {}
+
+// UnsafeDirectoryServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to DirectoryServiceServer will
+// result in compilation errors.
+type UnsafeDirectoryServiceServer interface {
+	mustEmbedUnimplementedDirectoryServiceServer()
+}
+
+func RegisterDirectoryServiceServer(s grpc.ServiceRegistrar, srv DirectoryServiceServer) {
+	s.RegisterService(&DirectoryService_ServiceDesc, srv)
+}
+
+func _DirectoryService_Get_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(GetDirectoryRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(DirectoryServiceServer).Get(m, &directoryServiceGetServer{stream})
+}
+
+type DirectoryService_GetServer interface {
+	Send(*Directory) error
+	grpc.ServerStream
+}
+
+type directoryServiceGetServer struct {
+	grpc.ServerStream
+}
+
+func (x *directoryServiceGetServer) Send(m *Directory) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func _DirectoryService_Put_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(DirectoryServiceServer).Put(&directoryServicePutServer{stream})
+}
+
+type DirectoryService_PutServer interface {
+	SendAndClose(*PutDirectoryResponse) error
+	Recv() (*Directory, error)
+	grpc.ServerStream
+}
+
+type directoryServicePutServer struct {
+	grpc.ServerStream
+}
+
+func (x *directoryServicePutServer) SendAndClose(m *PutDirectoryResponse) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *directoryServicePutServer) Recv() (*Directory, error) {
+	m := new(Directory)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// DirectoryService_ServiceDesc is the grpc.ServiceDesc for DirectoryService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var DirectoryService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "tvix.store.v1.DirectoryService",
+	HandlerType: (*DirectoryServiceServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "Get",
+			Handler:       _DirectoryService_Get_Handler,
+			ServerStreams: true,
+		},
+		{
+			StreamName:    "Put",
+			Handler:       _DirectoryService_Put_Handler,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "tvix/store/protos/rpc_directory.proto",
+}
diff --git a/tvix/store/protos/rpc_pathinfo.pb.go b/tvix/store/protos/rpc_pathinfo.pb.go
new file mode 100644
index 0000000000..f535dab56a
--- /dev/null
+++ b/tvix/store/protos/rpc_pathinfo.pb.go
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2022 The Tvix Authors
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        (unknown)
+// source: tvix/store/protos/rpc_pathinfo.proto
+
+package storev1
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// GetPathInfoRequest describes the lookup parameters that can be used to
+// lookup a PathInfo objects.
+// Currently, only a lookup by output hash is supported.
+type GetPathInfoRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Types that are assignable to ByWhat:
+	//
+	//	*GetPathInfoRequest_ByOutputHash
+	ByWhat isGetPathInfoRequest_ByWhat `protobuf_oneof:"by_what"`
+}
+
+func (x *GetPathInfoRequest) Reset() {
+	*x = GetPathInfoRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetPathInfoRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetPathInfoRequest) ProtoMessage() {}
+
+func (x *GetPathInfoRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[0]
+	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 GetPathInfoRequest.ProtoReflect.Descriptor instead.
+func (*GetPathInfoRequest) Descriptor() ([]byte, []int) {
+	return file_tvix_store_protos_rpc_pathinfo_proto_rawDescGZIP(), []int{0}
+}
+
+func (m *GetPathInfoRequest) GetByWhat() isGetPathInfoRequest_ByWhat {
+	if m != nil {
+		return m.ByWhat
+	}
+	return nil
+}
+
+func (x *GetPathInfoRequest) GetByOutputHash() []byte {
+	if x, ok := x.GetByWhat().(*GetPathInfoRequest_ByOutputHash); ok {
+		return x.ByOutputHash
+	}
+	return nil
+}
+
+type isGetPathInfoRequest_ByWhat interface {
+	isGetPathInfoRequest_ByWhat()
+}
+
+type GetPathInfoRequest_ByOutputHash struct {
+	// The output hash of a nix path (20 bytes).
+	// This is the nixbase32-decoded portion of a Nix output path, so to substitute
+	// /nix/store/xm35nga2g20mz5sm5l6n8v3bdm86yj83-cowsay-3.04
+	// this field would contain nixbase32dec("xm35nga2g20mz5sm5l6n8v3bdm86yj83").
+	ByOutputHash []byte `protobuf:"bytes,1,opt,name=by_output_hash,json=byOutputHash,proto3,oneof"`
+}
+
+func (*GetPathInfoRequest_ByOutputHash) isGetPathInfoRequest_ByWhat() {}
+
+var File_tvix_store_protos_rpc_pathinfo_proto protoreflect.FileDescriptor
+
+var file_tvix_store_protos_rpc_pathinfo_proto_rawDesc = []byte{
+	0x0a, 0x24, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x73, 0x2f, 0x72, 0x70, 0x63, 0x5f, 0x70, 0x61, 0x74, 0x68, 0x69, 0x6e, 0x66, 0x6f,
+	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0d, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f,
+	0x72, 0x65, 0x2e, 0x76, 0x31, 0x1a, 0x20, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72,
+	0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x70, 0x61, 0x74, 0x68, 0x69, 0x6e, 0x66,
+	0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x47, 0x0a, 0x12, 0x47, 0x65, 0x74, 0x50, 0x61,
+	0x74, 0x68, 0x49, 0x6e, 0x66, 0x6f, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x26, 0x0a,
+	0x0e, 0x62, 0x79, 0x5f, 0x6f, 0x75, 0x74, 0x70, 0x75, 0x74, 0x5f, 0x68, 0x61, 0x73, 0x68, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x0c, 0x48, 0x00, 0x52, 0x0c, 0x62, 0x79, 0x4f, 0x75, 0x74, 0x70, 0x75,
+	0x74, 0x48, 0x61, 0x73, 0x68, 0x42, 0x09, 0x0a, 0x07, 0x62, 0x79, 0x5f, 0x77, 0x68, 0x61, 0x74,
+	0x32, 0x8d, 0x01, 0x0a, 0x0f, 0x50, 0x61, 0x74, 0x68, 0x49, 0x6e, 0x66, 0x6f, 0x53, 0x65, 0x72,
+	0x76, 0x69, 0x63, 0x65, 0x12, 0x41, 0x0a, 0x03, 0x47, 0x65, 0x74, 0x12, 0x21, 0x2e, 0x74, 0x76,
+	0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x47, 0x65, 0x74, 0x50,
+	0x61, 0x74, 0x68, 0x49, 0x6e, 0x66, 0x6f, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x17,
+	0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x50,
+	0x61, 0x74, 0x68, 0x49, 0x6e, 0x66, 0x6f, 0x12, 0x37, 0x0a, 0x03, 0x50, 0x75, 0x74, 0x12, 0x17,
+	0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x50,
+	0x61, 0x74, 0x68, 0x49, 0x6e, 0x66, 0x6f, 0x1a, 0x17, 0x2e, 0x74, 0x76, 0x69, 0x78, 0x2e, 0x73,
+	0x74, 0x6f, 0x72, 0x65, 0x2e, 0x76, 0x31, 0x2e, 0x50, 0x61, 0x74, 0x68, 0x49, 0x6e, 0x66, 0x6f,
+	0x42, 0x28, 0x5a, 0x26, 0x63, 0x6f, 0x64, 0x65, 0x2e, 0x74, 0x76, 0x6c, 0x2e, 0x66, 0x79, 0x69,
+	0x2f, 0x74, 0x76, 0x69, 0x78, 0x2f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x73, 0x3b, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
+}
+
+var (
+	file_tvix_store_protos_rpc_pathinfo_proto_rawDescOnce sync.Once
+	file_tvix_store_protos_rpc_pathinfo_proto_rawDescData = file_tvix_store_protos_rpc_pathinfo_proto_rawDesc
+)
+
+func file_tvix_store_protos_rpc_pathinfo_proto_rawDescGZIP() []byte {
+	file_tvix_store_protos_rpc_pathinfo_proto_rawDescOnce.Do(func() {
+		file_tvix_store_protos_rpc_pathinfo_proto_rawDescData = protoimpl.X.CompressGZIP(file_tvix_store_protos_rpc_pathinfo_proto_rawDescData)
+	})
+	return file_tvix_store_protos_rpc_pathinfo_proto_rawDescData
+}
+
+var file_tvix_store_protos_rpc_pathinfo_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_tvix_store_protos_rpc_pathinfo_proto_goTypes = []interface{}{
+	(*GetPathInfoRequest)(nil), // 0: tvix.store.v1.GetPathInfoRequest
+	(*PathInfo)(nil),           // 1: tvix.store.v1.PathInfo
+}
+var file_tvix_store_protos_rpc_pathinfo_proto_depIdxs = []int32{
+	0, // 0: tvix.store.v1.PathInfoService.Get:input_type -> tvix.store.v1.GetPathInfoRequest
+	1, // 1: tvix.store.v1.PathInfoService.Put:input_type -> tvix.store.v1.PathInfo
+	1, // 2: tvix.store.v1.PathInfoService.Get:output_type -> tvix.store.v1.PathInfo
+	1, // 3: tvix.store.v1.PathInfoService.Put:output_type -> tvix.store.v1.PathInfo
+	2, // [2:4] is the sub-list for method output_type
+	0, // [0:2] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_tvix_store_protos_rpc_pathinfo_proto_init() }
+func file_tvix_store_protos_rpc_pathinfo_proto_init() {
+	if File_tvix_store_protos_rpc_pathinfo_proto != nil {
+		return
+	}
+	file_tvix_store_protos_pathinfo_proto_init()
+	if !protoimpl.UnsafeEnabled {
+		file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetPathInfoRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	file_tvix_store_protos_rpc_pathinfo_proto_msgTypes[0].OneofWrappers = []interface{}{
+		(*GetPathInfoRequest_ByOutputHash)(nil),
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_tvix_store_protos_rpc_pathinfo_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_tvix_store_protos_rpc_pathinfo_proto_goTypes,
+		DependencyIndexes: file_tvix_store_protos_rpc_pathinfo_proto_depIdxs,
+		MessageInfos:      file_tvix_store_protos_rpc_pathinfo_proto_msgTypes,
+	}.Build()
+	File_tvix_store_protos_rpc_pathinfo_proto = out.File
+	file_tvix_store_protos_rpc_pathinfo_proto_rawDesc = nil
+	file_tvix_store_protos_rpc_pathinfo_proto_goTypes = nil
+	file_tvix_store_protos_rpc_pathinfo_proto_depIdxs = nil
+}
diff --git a/tvix/store/protos/rpc_pathinfo_grpc.pb.go b/tvix/store/protos/rpc_pathinfo_grpc.pb.go
new file mode 100644
index 0000000000..b94d24dc5b
--- /dev/null
+++ b/tvix/store/protos/rpc_pathinfo_grpc.pb.go
@@ -0,0 +1,169 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             (unknown)
+// source: tvix/store/protos/rpc_pathinfo.proto
+
+package storev1
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// PathInfoServiceClient is the client API for PathInfoService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type PathInfoServiceClient interface {
+	// Get retrieves a PathInfo object, by using the lookup parameters in
+	// GetPathInfoRequest.
+	// If the PathInfo object contains a DirectoryNode, it needs to be looked
+	// up separately via the DirectoryService, which is purely
+	// content-addressed.
+	Get(ctx context.Context, in *GetPathInfoRequest, opts ...grpc.CallOption) (*PathInfo, error)
+	// Put uploads a PathInfo object to the remote end. It MUST not return
+	// until the PathInfo object has been written on the the remote end.
+	// The remote end MAY check if a potential DirectoryNode has already been
+	// uploaded.
+	// Uploading clients SHOULD obviously not steer other machines to try to
+	// substitute before from the remote end before having finished uploading
+	// PathInfo, Directories and Blobs.
+	// The returned PathInfo object MAY contain additional narinfo signatures,
+	// but is otherwise left untouched.
+	Put(ctx context.Context, in *PathInfo, opts ...grpc.CallOption) (*PathInfo, error)
+}
+
+type pathInfoServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewPathInfoServiceClient(cc grpc.ClientConnInterface) PathInfoServiceClient {
+	return &pathInfoServiceClient{cc}
+}
+
+func (c *pathInfoServiceClient) Get(ctx context.Context, in *GetPathInfoRequest, opts ...grpc.CallOption) (*PathInfo, error) {
+	out := new(PathInfo)
+	err := c.cc.Invoke(ctx, "/tvix.store.v1.PathInfoService/Get", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *pathInfoServiceClient) Put(ctx context.Context, in *PathInfo, opts ...grpc.CallOption) (*PathInfo, error) {
+	out := new(PathInfo)
+	err := c.cc.Invoke(ctx, "/tvix.store.v1.PathInfoService/Put", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// PathInfoServiceServer is the server API for PathInfoService service.
+// All implementations must embed UnimplementedPathInfoServiceServer
+// for forward compatibility
+type PathInfoServiceServer interface {
+	// Get retrieves a PathInfo object, by using the lookup parameters in
+	// GetPathInfoRequest.
+	// If the PathInfo object contains a DirectoryNode, it needs to be looked
+	// up separately via the DirectoryService, which is purely
+	// content-addressed.
+	Get(context.Context, *GetPathInfoRequest) (*PathInfo, error)
+	// Put uploads a PathInfo object to the remote end. It MUST not return
+	// until the PathInfo object has been written on the the remote end.
+	// The remote end MAY check if a potential DirectoryNode has already been
+	// uploaded.
+	// Uploading clients SHOULD obviously not steer other machines to try to
+	// substitute before from the remote end before having finished uploading
+	// PathInfo, Directories and Blobs.
+	// The returned PathInfo object MAY contain additional narinfo signatures,
+	// but is otherwise left untouched.
+	Put(context.Context, *PathInfo) (*PathInfo, error)
+	mustEmbedUnimplementedPathInfoServiceServer()
+}
+
+// UnimplementedPathInfoServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedPathInfoServiceServer struct {
+}
+
+func (UnimplementedPathInfoServiceServer) Get(context.Context, *GetPathInfoRequest) (*PathInfo, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Get not implemented")
+}
+func (UnimplementedPathInfoServiceServer) Put(context.Context, *PathInfo) (*PathInfo, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Put not implemented")
+}
+func (UnimplementedPathInfoServiceServer) mustEmbedUnimplementedPathInfoServiceServer() {}
+
+// UnsafePathInfoServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to PathInfoServiceServer will
+// result in compilation errors.
+type UnsafePathInfoServiceServer interface {
+	mustEmbedUnimplementedPathInfoServiceServer()
+}
+
+func RegisterPathInfoServiceServer(s grpc.ServiceRegistrar, srv PathInfoServiceServer) {
+	s.RegisterService(&PathInfoService_ServiceDesc, srv)
+}
+
+func _PathInfoService_Get_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetPathInfoRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(PathInfoServiceServer).Get(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tvix.store.v1.PathInfoService/Get",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(PathInfoServiceServer).Get(ctx, req.(*GetPathInfoRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _PathInfoService_Put_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(PathInfo)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(PathInfoServiceServer).Put(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/tvix.store.v1.PathInfoService/Put",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(PathInfoServiceServer).Put(ctx, req.(*PathInfo))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// PathInfoService_ServiceDesc is the grpc.ServiceDesc for PathInfoService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var PathInfoService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "tvix.store.v1.PathInfoService",
+	HandlerType: (*PathInfoServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Get",
+			Handler:    _PathInfoService_Get_Handler,
+		},
+		{
+			MethodName: "Put",
+			Handler:    _PathInfoService_Put_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "tvix/store/protos/rpc_pathinfo.proto",
+}