vendor: update buildkit to v0.19.0-rc1

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/moby/buildkit/client/llb/fileop.go

@@ -85,6 +85,13 @@ func (fa *FileAction) Mkfile(p string, m os.FileMode, dt []byte, opt ...MkfileOp
 	return a
 }
 
+// Symlink creates a symlink at `newpath` that points to `oldpath`
+func (fa *FileAction) Symlink(oldpath, newpath string, opt ...SymlinkOption) *FileAction {
+	a := Symlink(oldpath, newpath, opt...)
+	a.prev = fa
+	return a
+}
+
 func (fa *FileAction) Rm(p string, opt ...RmOption) *FileAction {
 	a := Rm(p, opt...)
 	a.prev = fa
@@ -193,6 +200,7 @@ type ChownOption interface {
 	MkdirOption
 	MkfileOption
 	CopyOption
+	SymlinkOption
 }
 
 type mkdirOptionFunc func(*MkdirInfo)
@@ -290,6 +298,10 @@ func (co ChownOpt) SetCopyOption(mi *CopyInfo) {
 	mi.ChownOpt = &co
 }
 
+func (co ChownOpt) SetSymlinkOption(si *SymlinkInfo) {
+	si.ChownOpt = &co
+}
+
 func (co *ChownOpt) marshal(base pb.InputIndex) *pb.ChownOpt {
 	if co == nil {
 		return nil
@@ -337,6 +349,57 @@ func Mkfile(p string, m os.FileMode, dt []byte, opts ...MkfileOption) *FileActio
 	}
 }
 
+// SymlinkInfo is the modifiable options used to create symlinks
+type SymlinkInfo struct {
+	ChownOpt    *ChownOpt
+	CreatedTime *time.Time
+}
+
+func (si *SymlinkInfo) SetSymlinkOption(si2 *SymlinkInfo) {
+	*si2 = *si
+}
+
+type SymlinkOption interface {
+	SetSymlinkOption(*SymlinkInfo)
+}
+
+// Symlink creates a symlink at `newpath` that points to `oldpath`
+func Symlink(oldpath, newpath string, opts ...SymlinkOption) *FileAction {
+	var si SymlinkInfo
+	for _, o := range opts {
+		o.SetSymlinkOption(&si)
+	}
+
+	return &FileAction{
+		action: &fileActionSymlink{
+			oldpath: oldpath,
+			newpath: newpath,
+			info:    si,
+		},
+	}
+}
+
+type fileActionSymlink struct {
+	oldpath string
+	newpath string
+	info    SymlinkInfo
+}
+
+func (s *fileActionSymlink) addCaps(f *FileOp) {
+	addCap(&f.constraints, pb.CapFileSymlinkCreate)
+}
+
+func (s *fileActionSymlink) toProtoAction(_ context.Context, _ string, base pb.InputIndex) (pb.IsFileAction, error) {
+	return &pb.FileAction_Symlink{
+		Symlink: &pb.FileActionSymlink{
+			Oldpath:   s.oldpath,
+			Newpath:   s.newpath,
+			Owner:     s.info.ChownOpt.marshal(base),
+			Timestamp: marshalTime(s.info.CreatedTime),
+		},
+	}, nil
+}
+
 type MkfileOption interface {
 	SetMkfileOption(*MkfileInfo)
 }
@@ -606,6 +669,10 @@ func (c CreatedTime) SetMkfileOption(mi *MkfileInfo) {
 	mi.CreatedTime = (*time.Time)(&c)
 }
 
+func (c CreatedTime) SetSymlinkOption(si *SymlinkInfo) {
+	si.CreatedTime = (*time.Time)(&c)
+}
+
 func (c CreatedTime) SetCopyOption(mi *CopyInfo) {
 	mi.CreatedTime = (*time.Time)(&c)
 }
@@ -746,7 +813,10 @@ func (ms *marshalState) add(fa *FileAction, c *Constraints) (*fileActionState, e
 }
 
 func (f *FileOp) Marshal(ctx context.Context, c *Constraints) (digest.Digest, []byte, *pb.OpMetadata, []*SourceLocation, error) {
-	if dgst, dt, md, srcs, err := f.Load(c); err == nil {
+	cache := f.Acquire()
+	defer cache.Release()
+
+	if dgst, dt, md, srcs, err := cache.Load(c); err == nil {
 		return dgst, dt, md, srcs, nil
 	}
 
@@ -816,7 +886,7 @@ func (f *FileOp) Marshal(ctx context.Context, c *Constraints) (digest.Digest, []
 	if err != nil {
 		return "", nil, nil, nil, err
 	}
-	return f.Store(dt, md, f.constraints.SourceLocations, c)
+	return cache.Store(dt, md, f.constraints.SourceLocations, c)
 }
 
 func normalizePath(parent, p string, keepSlash bool) string {