Add FileEntry cache to TagCache for selfupdate.

cipd/client/cipd/internal/messages/messages.pb.go

Index: cipd/client/cipd/internal/messages/messages.pb.go
diff --git a/cipd/client/cipd/internal/messages/messages.pb.go b/cipd/client/cipd/internal/messages/messages.pb.go
index 9909a5fe1f6c616176adc0454d781a843e488982..ed73cbb76a8486b63961684003dd6974db18e85b 100644
--- a/cipd/client/cipd/internal/messages/messages.pb.go
+++ b/cipd/client/cipd/internal/messages/messages.pb.go
@@ -43,11 +43,16 @@ func (m *BlobWithSHA1) String() string            { return proto.CompactTextStri
 func (*BlobWithSHA1) ProtoMessage()               {}
 func (*BlobWithSHA1) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
 
-// TagCache stores a mapping (package name, tag) -> instance ID to speed up
-// subsequence ResolveVersion calls when tags are used.
+// TagCache stores a mapping (package name, tag) -> instance ID to
+// speed up subsequent ResolveVersion calls when tags are used.
+//
+// It also contains a (instance_id, file_name) -> hash mapping which is used for
+// client self-update purposes. file_name is case-senstive and must always use
+// POSIX-style slashes.
 type TagCache struct {
 	// Capped list of entries, most recently resolved is last.
-	Entries []*TagCache_Entry `protobuf:"bytes,1,rep,name=entries" json:"entries,omitempty"`
+	Entries     []*TagCache_Entry     `protobuf:"bytes,1,rep,name=entries" json:"entries,omitempty"`
+	FileEntries []*TagCache_FileEntry `protobuf:"bytes,2,rep,name=file_entries,json=fileEntries" json:"file_entries,omitempty"`
 }
 
 func (m *TagCache) Reset()                    { *m = TagCache{} }
@@ -62,6 +67,13 @@ func (m *TagCache) GetEntries() []*TagCache_Entry {
 	return nil
 }
 
+func (m *TagCache) GetFileEntries() []*TagCache_FileEntry {
+	if m != nil {
+		return m.FileEntries
+	}
+	return nil
+}
+
 type TagCache_Entry struct {
 	Package    string `protobuf:"bytes,1,opt,name=package" json:"package,omitempty"`
 	Tag        string `protobuf:"bytes,2,opt,name=tag" json:"tag,omitempty"`
@@ -73,6 +85,18 @@ func (m *TagCache_Entry) String() string            { return proto.CompactTextSt
 func (*TagCache_Entry) ProtoMessage()               {}
 func (*TagCache_Entry) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1, 0} }
 
+type TagCache_FileEntry struct {
+	Package    string `protobuf:"bytes,1,opt,name=package" json:"package,omitempty"`
+	InstanceId string `protobuf:"bytes,2,opt,name=instance_id,json=instanceId" json:"instance_id,omitempty"`
+	FileName   string `protobuf:"bytes,3,opt,name=file_name,json=fileName" json:"file_name,omitempty"`
+	Hash       string `protobuf:"bytes,4,opt,name=hash" json:"hash,omitempty"`
+}
+
+func (m *TagCache_FileEntry) Reset()                    { *m = TagCache_FileEntry{} }
+func (m *TagCache_FileEntry) String() string            { return proto.CompactTextString(m) }
+func (*TagCache_FileEntry) ProtoMessage()               {}
+func (*TagCache_FileEntry) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1, 1} }
+
 // InstanceCache stores a list of instances in cache
 // and their last access time.
 type InstanceCache struct {
@@ -125,6 +149,7 @@ func init() {
 	proto.RegisterType((*BlobWithSHA1)(nil), "messages.BlobWithSHA1")
 	proto.RegisterType((*TagCache)(nil), "messages.TagCache")
 	proto.RegisterType((*TagCache_Entry)(nil), "messages.TagCache.Entry")
+	proto.RegisterType((*TagCache_FileEntry)(nil), "messages.TagCache.FileEntry")
 	proto.RegisterType((*InstanceCache)(nil), "messages.InstanceCache")
 	proto.RegisterType((*InstanceCache_Entry)(nil), "messages.InstanceCache.Entry")
 }
@@ -134,28 +159,32 @@ func init() {
 }
 
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