diff --git a/client/llb/fileop.go b/client/llb/fileop.go
index 82fc87c6..64f6ea31 100644
--- a/client/llb/fileop.go
+++ b/client/llb/fileop.go
@@ -4,6 +4,7 @@ import (
 	_ "crypto/sha256"
 	"os"
 	"path"
+	"time"
 
 	"github.com/moby/buildkit/solver/pb"
 	digest "github.com/opencontainers/go-digest"
@@ -149,6 +150,7 @@ func (a *fileActionMkdir) toProtoAction(parent string, base pb.InputIndex) pb.Is
 			Mode:        int32(a.mode & 0777),
 			MakeParents: a.info.MakeParents,
 			Owner:       a.info.ChownOpt.marshal(base),
+			Timestamp:   marshalTime(a.info.CreatedTime),
 		},
 	}
 }
@@ -180,6 +182,7 @@ func WithParents(b bool) MkdirOption {
 type MkdirInfo struct {
 	MakeParents bool
 	ChownOpt    *ChownOpt
+	CreatedTime *time.Time
 }
 
 func (mi *MkdirInfo) SetMkdirOption(mi2 *MkdirInfo) {
@@ -260,7 +263,8 @@ type MkfileOption interface {
 }
 
 type MkfileInfo struct {
-	ChownOpt *ChownOpt
+	ChownOpt    *ChownOpt
+	CreatedTime *time.Time
 }
 
 func (mi *MkfileInfo) SetMkfileOption(mi2 *MkfileInfo) {
@@ -279,10 +283,11 @@ type fileActionMkfile struct {
 func (a *fileActionMkfile) toProtoAction(parent string, base pb.InputIndex) pb.IsFileAction {
 	return &pb.FileAction_Mkfile{
 		Mkfile: &pb.FileActionMkFile{
-			Path:  normalizePath(parent, a.file),
-			Mode:  int32(a.mode & 0777),
-			Data:  a.dt,
-			Owner: a.info.ChownOpt.marshal(base),
+			Path:      normalizePath(parent, a.file),
+			Mode:      int32(a.mode & 0777),
+			Data:      a.dt,
+			Owner:     a.info.ChownOpt.marshal(base),
+			Timestamp: marshalTime(a.info.CreatedTime),
 		},
 	}
 }
@@ -391,6 +396,7 @@ type CopyInfo struct {
 	AllowWildcard       bool
 	AllowEmptyWildcard  bool
 	ChownOpt            *ChownOpt
+	CreatedTime         *time.Time
 }
 
 func (mi *CopyInfo) SetCopyOption(mi2 *CopyInfo) {
@@ -418,6 +424,7 @@ func (a *fileActionCopy) toProtoAction(parent string, base pb.InputIndex) pb.IsF
 		DirCopyContents:    a.info.CopyDirContentsOnly,
 		AttemptUnpack:      a.info.AttemptUnpack,
 		CreateDestPath:     a.info.CreateDestPath,
+		Timestamp:          marshalTime(a.info.CreatedTime),
 	}
 	if a.info.Mode != nil {
 		c.Mode = int32(*a.info.Mode)
@@ -441,6 +448,31 @@ func (c *fileActionCopy) sourcePath() string {
 	return p
 }
 
+type CreatedTime time.Time
+
+func WithCreatedTime(t time.Time) CreatedTime {
+	return CreatedTime(t)
+}
+
+func (c CreatedTime) SetMkdirOption(mi *MkdirInfo) {
+	mi.CreatedTime = (*time.Time)(&c)
+}
+
+func (c CreatedTime) SetMkfileOption(mi *MkfileInfo) {
+	mi.CreatedTime = (*time.Time)(&c)
+}
+
+func (c CreatedTime) SetCopyOption(mi *CopyInfo) {
+	mi.CreatedTime = (*time.Time)(&c)
+}
+
+func marshalTime(t *time.Time) int64 {
+	if t == nil {
+		return -1
+	}
+	return t.UnixNano()
+}
+
 type FileOp struct {
 	MarshalCache
 	action *FileAction
diff --git a/client/llb/fileop_test.go b/client/llb/fileop_test.go
index f0a433e9..76ae9b65 100644
--- a/client/llb/fileop_test.go
+++ b/client/llb/fileop_test.go
@@ -2,6 +2,7 @@ package llb
 
 import (
 	"testing"
+	"time"
 
 	"github.com/moby/buildkit/solver/pb"
 	digest "github.com/opencontainers/go-digest"
@@ -39,6 +40,7 @@ func TestFileMkdir(t *testing.T) {
 
 	require.Equal(t, "/foo", mkdir.Path)
 	require.Equal(t, 0700, int(mkdir.Mode))
+	require.Equal(t, int64(-1), mkdir.Timestamp)
 }
 
 func TestFileMkdirChain(t *testing.T) {
@@ -126,6 +128,7 @@ func TestFileMkfile(t *testing.T) {
 	require.Equal(t, "/foo", mkdir.Path)
 	require.Equal(t, 0700, int(mkdir.Mode))
 	require.Equal(t, "data", string(mkdir.Data))
+	require.Equal(t, int64(-1), mkdir.Timestamp)
 }
 
 func TestFileRm(t *testing.T) {
@@ -270,6 +273,7 @@ func TestFileCopy(t *testing.T) {
 
 	require.Equal(t, "/etc/foo", copy.Src)
 	require.Equal(t, "/tmp/bar", copy.Dest)
+	require.Equal(t, int64(-1), copy.Timestamp)
 }
 
 func TestFileCopyFromAction(t *testing.T) {
@@ -560,6 +564,48 @@ func TestFileCopyOwner(t *testing.T) {
 	require.Equal(t, -1, int(copy.Owner.Group.Input))
 }
 
+func TestFileCreatedTime(t *testing.T) {
+	t.Parallel()
+
+	dt := time.Now()
+	dt2 := time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)
+	dt3 := time.Date(2019, time.November, 10, 23, 0, 0, 0, time.UTC)
+
+	st := Image("foo").File(
+		Mkdir("/foo", 0700, WithCreatedTime(dt)).
+			Mkfile("bar", 0600, []byte{}, WithCreatedTime(dt2)).
+			Copy(Scratch(), "src", "dst", WithCreatedTime(dt3)))
+	def, err := st.Marshal()
+
+	require.NoError(t, err)
+
+	m, arr := parseDef(t, def.Def)
+	require.Equal(t, 3, len(arr))
+
+	dgst, idx := last(t, arr)
+	require.Equal(t, 0, idx)
+	require.Equal(t, m[dgst], arr[1])
+
+	f := arr[1].Op.(*pb.Op_File).File
+	require.Equal(t, len(arr[1].Inputs), 1)
+	require.Equal(t, m[arr[1].Inputs[0].Digest], arr[0])
+	require.Equal(t, 0, int(arr[1].Inputs[0].Index))
+
+	require.Equal(t, 3, len(f.Actions))
+
+	action := f.Actions[0]
+	mkdir := action.Action.(*pb.FileAction_Mkdir).Mkdir
+	require.Equal(t, dt.UnixNano(), mkdir.Timestamp)
+
+	action = f.Actions[1]
+	mkfile := action.Action.(*pb.FileAction_Mkfile).Mkfile
+	require.Equal(t, dt2.UnixNano(), mkfile.Timestamp)
+
+	action = f.Actions[2]
+	copy := action.Action.(*pb.FileAction_Copy).Copy
+	require.Equal(t, dt3.UnixNano(), copy.Timestamp)
+}
+
 func parseDef(t *testing.T, def [][]byte) (map[digest.Digest]pb.Op, []pb.Op) {
 	m := map[digest.Digest]pb.Op{}
 	arr := make([]pb.Op, 0, len(def))
diff --git a/solver/pb/ops.pb.go b/solver/pb/ops.pb.go
index 8ec78919..372b94a4 100644
--- a/solver/pb/ops.pb.go
+++ b/solver/pb/ops.pb.go
@@ -54,7 +54,7 @@ func (x NetMode) String() string {
 	return proto.EnumName(NetMode_name, int32(x))
 }
 func (NetMode) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{0}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{0}
 }
 
 // MountType defines a type of a mount from a supported set
@@ -87,7 +87,7 @@ func (x MountType) String() string {
 	return proto.EnumName(MountType_name, int32(x))
 }
 func (MountType) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{1}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{1}
 }
 
 // CacheSharingOpt defines different sharing modes for cache mount
@@ -117,7 +117,7 @@ func (x CacheSharingOpt) String() string {
 	return proto.EnumName(CacheSharingOpt_name, int32(x))
 }
 func (CacheSharingOpt) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{2}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{2}
 }
 
 // Op represents a vertex of the LLB DAG.
@@ -138,7 +138,7 @@ func (m *Op) Reset()         { *m = Op{} }
 func (m *Op) String() string { return proto.CompactTextString(m) }
 func (*Op) ProtoMessage()    {}
 func (*Op) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{0}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{0}
 }
 func (m *Op) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -368,7 +368,7 @@ func (m *Platform) Reset()         { *m = Platform{} }
 func (m *Platform) String() string { return proto.CompactTextString(m) }
 func (*Platform) ProtoMessage()    {}
 func (*Platform) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{1}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{1}
 }
 func (m *Platform) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -440,7 +440,7 @@ func (m *Input) Reset()         { *m = Input{} }
 func (m *Input) String() string { return proto.CompactTextString(m) }
 func (*Input) ProtoMessage()    {}
 func (*Input) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{2}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{2}
 }
 func (m *Input) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -476,7 +476,7 @@ func (m *ExecOp) Reset()         { *m = ExecOp{} }
 func (m *ExecOp) String() string { return proto.CompactTextString(m) }
 func (*ExecOp) ProtoMessage()    {}
 func (*ExecOp) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{3}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{3}
 }
 func (m *ExecOp) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -538,7 +538,7 @@ func (m *Meta) Reset()         { *m = Meta{} }
 func (m *Meta) String() string { return proto.CompactTextString(m) }
 func (*Meta) ProtoMessage()    {}
 func (*Meta) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{4}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{4}
 }
 func (m *Meta) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -622,7 +622,7 @@ func (m *Mount) Reset()         { *m = Mount{} }
 func (m *Mount) String() string { return proto.CompactTextString(m) }
 func (*Mount) ProtoMessage()    {}
 func (*Mount) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{5}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{5}
 }
 func (m *Mount) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -708,7 +708,7 @@ func (m *CacheOpt) Reset()         { *m = CacheOpt{} }
 func (m *CacheOpt) String() string { return proto.CompactTextString(m) }
 func (*CacheOpt) ProtoMessage()    {}
 func (*CacheOpt) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{6}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{6}
 }
 func (m *CacheOpt) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -766,7 +766,7 @@ func (m *SecretOpt) Reset()         { *m = SecretOpt{} }
 func (m *SecretOpt) String() string { return proto.CompactTextString(m) }
 func (*SecretOpt) ProtoMessage()    {}
 func (*SecretOpt) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{7}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{7}
 }
 func (m *SecretOpt) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -845,7 +845,7 @@ func (m *SSHOpt) Reset()         { *m = SSHOpt{} }
 func (m *SSHOpt) String() string { return proto.CompactTextString(m) }
 func (*SSHOpt) ProtoMessage()    {}
 func (*SSHOpt) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{8}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{8}
 }
 func (m *SSHOpt) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -918,7 +918,7 @@ func (m *SourceOp) Reset()         { *m = SourceOp{} }
 func (m *SourceOp) String() string { return proto.CompactTextString(m) }
 func (*SourceOp) ProtoMessage()    {}
 func (*SourceOp) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{9}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{9}
 }
 func (m *SourceOp) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -970,7 +970,7 @@ func (m *BuildOp) Reset()         { *m = BuildOp{} }
 func (m *BuildOp) String() string { return proto.CompactTextString(m) }
 func (*BuildOp) ProtoMessage()    {}
 func (*BuildOp) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{10}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{10}
 }
 func (m *BuildOp) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1025,7 +1025,7 @@ func (m *BuildInput) Reset()         { *m = BuildInput{} }
 func (m *BuildInput) String() string { return proto.CompactTextString(m) }
 func (*BuildInput) ProtoMessage()    {}
 func (*BuildInput) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{11}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{11}
 }
 func (m *BuildInput) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1066,7 +1066,7 @@ func (m *OpMetadata) Reset()         { *m = OpMetadata{} }
 func (m *OpMetadata) String() string { return proto.CompactTextString(m) }
 func (*OpMetadata) ProtoMessage()    {}
 func (*OpMetadata) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{12}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{12}
 }
 func (m *OpMetadata) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1127,7 +1127,7 @@ func (m *ExportCache) Reset()         { *m = ExportCache{} }
 func (m *ExportCache) String() string { return proto.CompactTextString(m) }
 func (*ExportCache) ProtoMessage()    {}
 func (*ExportCache) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{13}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{13}
 }
 func (m *ExportCache) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1170,7 +1170,7 @@ func (m *ProxyEnv) Reset()         { *m = ProxyEnv{} }
 func (m *ProxyEnv) String() string { return proto.CompactTextString(m) }
 func (*ProxyEnv) ProtoMessage()    {}
 func (*ProxyEnv) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{14}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{14}
 }
 func (m *ProxyEnv) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1232,7 +1232,7 @@ func (m *WorkerConstraints) Reset()         { *m = WorkerConstraints{} }
 func (m *WorkerConstraints) String() string { return proto.CompactTextString(m) }
 func (*WorkerConstraints) ProtoMessage()    {}
 func (*WorkerConstraints) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{15}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{15}
 }
 func (m *WorkerConstraints) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1277,7 +1277,7 @@ func (m *Definition) Reset()         { *m = Definition{} }
 func (m *Definition) String() string { return proto.CompactTextString(m) }
 func (*Definition) ProtoMessage()    {}
 func (*Definition) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{16}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{16}
 }
 func (m *Definition) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1325,7 +1325,7 @@ func (m *HostIP) Reset()         { *m = HostIP{} }
 func (m *HostIP) String() string { return proto.CompactTextString(m) }
 func (*HostIP) ProtoMessage()    {}
 func (*HostIP) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{17}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{17}
 }
 func (m *HostIP) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1372,7 +1372,7 @@ func (m *FileOp) Reset()         { *m = FileOp{} }
 func (m *FileOp) String() string { return proto.CompactTextString(m) }
 func (*FileOp) ProtoMessage()    {}
 func (*FileOp) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{18}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{18}
 }
 func (m *FileOp) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1420,7 +1420,7 @@ func (m *FileAction) Reset()         { *m = FileAction{} }
 func (m *FileAction) String() string { return proto.CompactTextString(m) }
 func (*FileAction) ProtoMessage()    {}
 func (*FileAction) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{19}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{19}
 }
 func (m *FileAction) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1627,13 +1627,14 @@ type FileActionCopy struct {
 	CreateDestPath     bool      `protobuf:"varint,9,opt,name=createDestPath,proto3" json:"createDestPath,omitempty"`
 	AllowWildcard      bool      `protobuf:"varint,10,opt,name=allowWildcard,proto3" json:"allowWildcard,omitempty"`
 	AllowEmptyWildcard bool      `protobuf:"varint,11,opt,name=allowEmptyWildcard,proto3" json:"allowEmptyWildcard,omitempty"`
+	Timestamp          int64     `protobuf:"varint,12,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 }
 
 func (m *FileActionCopy) Reset()         { *m = FileActionCopy{} }
 func (m *FileActionCopy) String() string { return proto.CompactTextString(m) }
 func (*FileActionCopy) ProtoMessage()    {}
 func (*FileActionCopy) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{20}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{20}
 }
 func (m *FileActionCopy) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1728,18 +1729,26 @@ func (m *FileActionCopy) GetAllowEmptyWildcard() bool {
 	return false
 }
 
+func (m *FileActionCopy) GetTimestamp() int64 {
+	if m != nil {
+		return m.Timestamp
+	}
+	return 0
+}
+
 type FileActionMkFile struct {
-	Path  string    `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
-	Mode  int32     `protobuf:"varint,2,opt,name=mode,proto3" json:"mode,omitempty"`
-	Data  []byte    `protobuf:"bytes,3,opt,name=data,proto3" json:"data,omitempty"`
-	Owner *ChownOpt `protobuf:"bytes,4,opt,name=owner,proto3" json:"owner,omitempty"`
+	Path      string    `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
+	Mode      int32     `protobuf:"varint,2,opt,name=mode,proto3" json:"mode,omitempty"`
+	Data      []byte    `protobuf:"bytes,3,opt,name=data,proto3" json:"data,omitempty"`
+	Owner     *ChownOpt `protobuf:"bytes,4,opt,name=owner,proto3" json:"owner,omitempty"`
+	Timestamp int64     `protobuf:"varint,5,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 }
 
 func (m *FileActionMkFile) Reset()         { *m = FileActionMkFile{} }
 func (m *FileActionMkFile) String() string { return proto.CompactTextString(m) }
 func (*FileActionMkFile) ProtoMessage()    {}
 func (*FileActionMkFile) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{21}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{21}
 }
 func (m *FileActionMkFile) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1792,18 +1801,26 @@ func (m *FileActionMkFile) GetOwner() *ChownOpt {
 	return nil
 }
 
+func (m *FileActionMkFile) GetTimestamp() int64 {
+	if m != nil {
+		return m.Timestamp
+	}
+	return 0
+}
+
 type FileActionMkDir struct {
 	Path        string    `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
 	Mode        int32     `protobuf:"varint,2,opt,name=mode,proto3" json:"mode,omitempty"`
 	MakeParents bool      `protobuf:"varint,3,opt,name=makeParents,proto3" json:"makeParents,omitempty"`
 	Owner       *ChownOpt `protobuf:"bytes,4,opt,name=owner,proto3" json:"owner,omitempty"`
+	Timestamp   int64     `protobuf:"varint,5,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 }
 
 func (m *FileActionMkDir) Reset()         { *m = FileActionMkDir{} }
 func (m *FileActionMkDir) String() string { return proto.CompactTextString(m) }
 func (*FileActionMkDir) ProtoMessage()    {}
 func (*FileActionMkDir) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{22}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{22}
 }
 func (m *FileActionMkDir) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1856,6 +1873,13 @@ func (m *FileActionMkDir) GetOwner() *ChownOpt {
 	return nil
 }
 
+func (m *FileActionMkDir) GetTimestamp() int64 {
+	if m != nil {
+		return m.Timestamp
+	}
+	return 0
+}
+
 type FileActionRm struct {
 	Path          string `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
 	AllowNotFound bool   `protobuf:"varint,2,opt,name=allowNotFound,proto3" json:"allowNotFound,omitempty"`
@@ -1866,7 +1890,7 @@ func (m *FileActionRm) Reset()         { *m = FileActionRm{} }
 func (m *FileActionRm) String() string { return proto.CompactTextString(m) }
 func (*FileActionRm) ProtoMessage()    {}
 func (*FileActionRm) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{23}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{23}
 }
 func (m *FileActionRm) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1921,7 +1945,7 @@ func (m *ChownOpt) Reset()         { *m = ChownOpt{} }
 func (m *ChownOpt) String() string { return proto.CompactTextString(m) }
 func (*ChownOpt) ProtoMessage()    {}
 func (*ChownOpt) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{24}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{24}
 }
 func (m *ChownOpt) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -1970,7 +1994,7 @@ func (m *UserOpt) Reset()         { *m = UserOpt{} }
 func (m *UserOpt) String() string { return proto.CompactTextString(m) }
 func (*UserOpt) ProtoMessage()    {}
 func (*UserOpt) Descriptor() ([]byte, []int) {
-	return fileDescriptor_ops_68b9efdb358e5df5, []int{25}
+	return fileDescriptor_ops_5b0fc877b949f769, []int{25}
 }
 func (m *UserOpt) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -3251,6 +3275,11 @@ func (m *FileActionCopy) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i++
 	}
+	if m.Timestamp != 0 {
+		dAtA[i] = 0x60
+		i++
+		i = encodeVarintOps(dAtA, i, uint64(m.Timestamp))
+	}
 	return i, nil
 }
 
@@ -3296,6 +3325,11 @@ func (m *FileActionMkFile) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += n23
 	}
+	if m.Timestamp != 0 {
+		dAtA[i] = 0x28
+		i++
+		i = encodeVarintOps(dAtA, i, uint64(m.Timestamp))
+	}
 	return i, nil
 }
 
@@ -3345,6 +3379,11 @@ func (m *FileActionMkDir) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += n24
 	}
+	if m.Timestamp != 0 {
+		dAtA[i] = 0x28
+		i++
+		i = encodeVarintOps(dAtA, i, uint64(m.Timestamp))
+	}
 	return i, nil
 }
 
@@ -4080,6 +4119,9 @@ func (m *FileActionCopy) Size() (n int) {
 	if m.AllowEmptyWildcard {
 		n += 2
 	}
+	if m.Timestamp != 0 {
+		n += 1 + sovOps(uint64(m.Timestamp))
+	}
 	return n
 }
 
@@ -4104,6 +4146,9 @@ func (m *FileActionMkFile) Size() (n int) {
 		l = m.Owner.Size()
 		n += 1 + l + sovOps(uint64(l))
 	}
+	if m.Timestamp != 0 {
+		n += 1 + sovOps(uint64(m.Timestamp))
+	}
 	return n
 }
 
@@ -4127,6 +4172,9 @@ func (m *FileActionMkDir) Size() (n int) {
 		l = m.Owner.Size()
 		n += 1 + l + sovOps(uint64(l))
 	}
+	if m.Timestamp != 0 {
+		n += 1 + sovOps(uint64(m.Timestamp))
+	}
 	return n
 }
 
@@ -7962,6 +8010,25 @@ func (m *FileActionCopy) Unmarshal(dAtA []byte) error {
 				}
 			}
 			m.AllowEmptyWildcard = bool(v != 0)
+		case 12:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Timestamp", wireType)
+			}
+			m.Timestamp = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Timestamp |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipOps(dAtA[iNdEx:])
@@ -8124,6 +8191,25 @@ func (m *FileActionMkFile) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Timestamp", wireType)
+			}
+			m.Timestamp = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Timestamp |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipOps(dAtA[iNdEx:])
@@ -8275,6 +8361,25 @@ func (m *FileActionMkDir) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Timestamp", wireType)
+			}
+			m.Timestamp = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Timestamp |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipOps(dAtA[iNdEx:])
@@ -8753,124 +8858,126 @@ var (
 	ErrIntOverflowOps   = fmt.Errorf("proto: integer overflow")
 )
 
-func init() { proto.RegisterFile("ops.proto", fileDescriptor_ops_68b9efdb358e5df5) }
+func init() { proto.RegisterFile("ops.proto", fileDescriptor_ops_5b0fc877b949f769) }
 
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+	0xb9, 0x92, 0x9a, 0x8e, 0xed, 0xb6, 0x25, 0x2b, 0xcc, 0x5c, 0xdf, 0x50, 0x7c, 0x7b, 0xdf, 0xd0,
+	0x82, 0x92, 0xc7, 0xe3, 0xb9, 0xb9, 0xbe, 0x64, 0xf9, 0x20, 0x1d, 0x1e, 0xcf, 0xb1, 0x6f, 0x47,
+	0x06, 0x69, 0x43, 0x25, 0x9c, 0xa8, 0xde, 0x5e, 0xb7, 0x51, 0x77, 0x97, 0xb9, 0xa7, 0x13, 0x1c,
+	0xe3, 0x97, 0x80, 0x66, 0x91, 0x7d, 0x28, 0x87, 0x13, 0x3f, 0x10, 0xaa, 0xe3, 0xa8, 0xeb, 0x7a,
+	0x9d, 0xa7, 0x77, 0x03, 0x81, 0xfd, 0xbe, 0xe2, 0x10, 0x07, 0x2c, 0x11, 0x36, 0xab, 0x8a, 0xd9,
+	0x58, 0xf1, 0x66, 0x78, 0xb2, 0x46, 0x2d, 0x11, 0x1e, 0xd7, 0xa0, 0xa2, 0xfd, 0xea, 0xfc, 0xbe,
+	0x08, 0x9b, 0xcb, 0x56, 0x62, 0x1e, 0x24, 0xc2, 0x4b, 0xf3, 0x20, 0x11, 0xde, 0xa2, 0xa5, 0xb2,
+	0x72, 0x2d, 0x95, 0x03, 0x65, 0x7e, 0x1d, 0x99, 0x16, 0x31, 0xed, 0x6c, 0xae, 0xf8, 0x75, 0x84,
+	0xcd, 0x83, 0x16, 0x2d, 0x6a, 0x31, 0x9e, 0xb2, 0x6c, 0x6a, 0xf1, 0x27, 0xb0, 0x31, 0xe2, 0xd3,
+	0x29, 0xbf, 0x1e, 0xce, 0xc3, 0x69, 0x10, 0x4d, 0xd4, 0x99, 0x6a, 0x74, 0x19, 0x24, 0x2d, 0xb8,
+	0xe3, 0x07, 0x02, 0xcd, 0xe9, 0xf0, 0x48, 0x32, 0xec, 0x89, 0xab, 0x8a, 0xb7, 0x0a, 0xa3, 0x3e,
+	0x57, 0x4a, 0x16, 0xc6, 0xf2, 0x71, 0x14, 0xbb, 0xde, 0xa4, 0x59, 0xd3, 0xfa, 0x96, 0x40, 0xf2,
+	0x29, 0x6c, 0x7a, 0x82, 0xb9, 0x92, 0x75, 0x59, 0x22, 0xcf, 0x5d, 0x79, 0xd5, 0xb4, 0x15, 0x6d,
+	0x05, 0x55, 0xda, 0xd0, 0x8e, 0xa7, 0xc1, 0xd4, 0xf7, 0x5c, 0xe1, 0xab, 0x2f, 0x26, 0xd4, 0x96,
+	0x07, 0x49, 0x1b, 0x88, 0x02, 0x7a, 0x61, 0x2c, 0xe7, 0x0b, 0x6a, 0x5d, 0x51, 0x6f, 0x91, 0xe0,
+	0xe7, 0x8b, 0x0c, 0x42, 0x96, 0x48, 0x37, 0x8c, 0x9b, 0xeb, 0x98, 0x49, 0x34, 0x03, 0x9c, 0x6f,
+	0x0b, 0xd0, 0x58, 0x0d, 0x3e, 0xba, 0x2e, 0x46, 0x33, 0xcd, 0x35, 0xc2, 0xf1, 0xc2, 0x9d, 0x56,
+	0xce, 0x9d, 0x18, 0x1a, 0x7c, 0x2f, 0x30, 0x3f, 0xd7, 0xa9, 0x1a, 0xbf, 0x53, 0x68, 0x96, 0x4c,
+	0x2a, 0xaf, 0x9a, 0xf4, 0xa7, 0x02, 0xdc, 0x59, 0x49, 0xb0, 0x77, 0xb6, 0x68, 0x17, 0xea, 0xa1,
+	0x3b, 0x61, 0xe7, 0xae, 0x50, 0x61, 0x2b, 0xea, 0x92, 0x99, 0x83, 0xfe, 0x0f, 0xf6, 0x45, 0xb0,
+	0x9e, 0xcf, 0xea, 0x5b, 0x6d, 0x4b, 0x43, 0x79, 0xc6, 0xe5, 0x23, 0x3e, 0x8b, 0x7c, 0x53, 0x67,
+	0x96, 0xc1, 0x37, 0x03, 0x5e, 0xbc, 0x25, 0xe0, 0xce, 0x19, 0xd4, 0x52, 0x03, 0xc9, 0x8e, 0xf9,
+	0x34, 0x2a, 0x64, 0xdf, 0xdc, 0x8f, 0x13, 0x26, 0xd0, 0x76, 0xfd, 0x9d, 0xf4, 0x11, 0x94, 0xc7,
+	0x82, 0xcf, 0x62, 0xf3, 0x6a, 0x2e, 0x31, 0xb4, 0xc4, 0x79, 0x0a, 0x55, 0x83, 0xa0, 0xe9, 0x91,
+	0x1b, 0xa6, 0x1f, 0xc8, 0x6a, 0x9c, 0x3d, 0x6e, 0xd6, 0xdb, 0x1e, 0xb7, 0x4d, 0xb0, 0x4c, 0xfb,
+	0x5b, 0xa6, 0x56, 0xe0, 0xef, 0xb5, 0xa0, 0x6a, 0x3e, 0x06, 0x89, 0x0d, 0xe5, 0xc7, 0x67, 0xc3,
+	0xde, 0x45, 0x63, 0x8d, 0xd4, 0xa0, 0x74, 0x32, 0x18, 0x5e, 0x34, 0x0a, 0x38, 0x3a, 0x1b, 0x9c,
+	0xf5, 0x1a, 0xd6, 0xde, 0xaf, 0xc1, 0x5e, 0x7c, 0xb4, 0x20, 0x7c, 0xdc, 0x3f, 0xeb, 0x36, 0xd6,
+	0x08, 0x40, 0x65, 0xd8, 0xeb, 0xd0, 0x1e, 0x92, 0xab, 0x50, 0x1c, 0x0e, 0x4f, 0x1a, 0x16, 0xaa,
+	0xea, 0x1c, 0x75, 0x4e, 0x7a, 0x8d, 0x22, 0x0e, 0x2f, 0x4e, 0xcf, 0x1f, 0x0d, 0x1b, 0xa5, 0xbd,
+	0x2f, 0xe0, 0xce, 0xca, 0x47, 0x83, 0x5a, 0x7d, 0x72, 0x44, 0x7b, 0xa8, 0xa9, 0x0e, 0xd5, 0x73,
+	0xda, 0x7f, 0x72, 0x74, 0xd1, 0x6b, 0x14, 0x50, 0xf0, 0xdb, 0x41, 0xe7, 0x9b, 0x5e, 0xb7, 0x61,
+	0x1d, 0xdf, 0xff, 0xee, 0xd5, 0x76, 0xe1, 0xfb, 0x57, 0xdb, 0x85, 0x1f, 0x5e, 0x6d, 0x17, 0xfe,
+	0xfd, 0x6a, 0xbb, 0xf0, 0xed, 0xeb, 0xed, 0xb5, 0xef, 0x5f, 0x6f, 0xaf, 0xfd, 0xf0, 0x7a, 0x7b,
+	0xed, 0xb2, 0xa2, 0xfe, 0x70, 0xf9, 0xfc, 0x3f, 0x01, 0x00, 0x00, 0xff, 0xff, 0x80, 0xe3, 0x0a,
+	0xb5, 0xb0, 0x11, 0x00, 0x00,
 }
diff --git a/solver/pb/ops.proto b/solver/pb/ops.proto
index 31e894f1..fa78c4aa 100644
--- a/solver/pb/ops.proto
+++ b/solver/pb/ops.proto
@@ -221,13 +221,14 @@ message FileActionCopy {
 	string src = 1;
 	string dest = 2;
 	ChownOpt owner = 4;
-  int32 mode = 5;
+	int32 mode = 5;
 	bool followSymlink = 6;
 	bool dirCopyContents = 7;
-  bool attemptUnpack = 8;
-  bool createDestPath = 9;
-  bool allowWildcard = 10;
-  bool allowEmptyWildcard = 11;
+	bool attemptUnpack = 8;
+	bool createDestPath = 9;
+	bool allowWildcard = 10;
+	bool allowEmptyWildcard = 11;
+	int64 timestamp = 12;
 }
 
 message FileActionMkFile {
@@ -235,19 +236,21 @@ message FileActionMkFile {
 	int32 mode = 2;
 	bytes data = 3;
 	ChownOpt owner = 4;
+	int64 timestamp = 5;
 }
 
 message FileActionMkDir {
 	string path = 1;
 	int32 mode = 2;
-  bool makeParents = 3;
+	bool makeParents = 3;
 	ChownOpt owner = 4;
+	int64 timestamp = 5;
 }
 
 message FileActionRm {
 	string path = 1;
-  bool allowNotFound = 2;
-  bool allowWildcard = 3;
+	bool allowNotFound = 2;
+	bool allowWildcard = 3;
 }
 
 message ChownOpt {