DockerCLI/vendor/github.com/moby/buildkit/session/filesync/diffcopy.go

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package filesync
import (
"bufio"
io "io"
"os"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/tonistiigi/fsutil"
"google.golang.org/grpc"
)
func sendDiffCopy(stream grpc.Stream, fs fsutil.FS, progress progressCb) error {
return fsutil.Send(stream.Context(), stream, fs, progress)
}
func newStreamWriter(stream grpc.ClientStream) io.WriteCloser {
wc := &streamWriterCloser{ClientStream: stream}
return &bufferedWriteCloser{Writer: bufio.NewWriter(wc), Closer: wc}
}
type bufferedWriteCloser struct {
*bufio.Writer
io.Closer
}
func (bwc *bufferedWriteCloser) Close() error {
if err := bwc.Writer.Flush(); err != nil {
return err
}
return bwc.Closer.Close()
}
type streamWriterCloser struct {
grpc.ClientStream
}
func (wc *streamWriterCloser) Write(dt []byte) (int, error) {
if err := wc.ClientStream.SendMsg(&BytesMessage{Data: dt}); err != nil {
return 0, err
}
return len(dt), nil
}
func (wc *streamWriterCloser) Close() error {
if err := wc.ClientStream.CloseSend(); err != nil {
return err
}
// block until receiver is done
var bm BytesMessage
if err := wc.ClientStream.RecvMsg(&bm); err != io.EOF {
return err
}
return nil
}
func recvDiffCopy(ds grpc.Stream, dest string, cu CacheUpdater, progress progressCb) error {
st := time.Now()
defer func() {
logrus.Debugf("diffcopy took: %v", time.Since(st))
}()
var cf fsutil.ChangeFunc
var ch fsutil.ContentHasher
if cu != nil {
cu.MarkSupported(true)
cf = cu.HandleChange
ch = cu.ContentHasher()
}
return fsutil.Receive(ds.Context(), ds, dest, fsutil.ReceiveOpt{
NotifyHashed: cf,
ContentHasher: ch,
ProgressCb: progress,
})
}
func syncTargetDiffCopy(ds grpc.Stream, dest string) error {
if err := os.MkdirAll(dest, 0700); err != nil {
return err
}
return fsutil.Receive(ds.Context(), ds, dest, fsutil.ReceiveOpt{
Merge: true,
Filter: func() func(*fsutil.Stat) bool {
uid := os.Getuid()
gid := os.Getgid()
return func(st *fsutil.Stat) bool {
st.Uid = uint32(uid)
st.Gid = uint32(gid)
return true
}
}(),
})
}
func writeTargetFile(ds grpc.Stream, wc io.WriteCloser) error {
for {
bm := BytesMessage{}
if err := ds.RecvMsg(&bm); err != nil {
if errors.Cause(err) == io.EOF {
return nil
}
return err
}
if _, err := wc.Write(bm.Data); err != nil {
return err
}
}
}