From 575f2ed7f2283564fe0a7425d7eb892fe26e684c Mon Sep 17 00:00:00 2001
From: Nicolas De Loof <nicolas.deloof@gmail.com>
Date: Tue, 9 Jan 2024 15:14:34 +0100
Subject: [PATCH] watch: remove requirements for tar binary and for sync target
 to be rw

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
---
 internal/sync/tar.go | 24 +++++-------------------
 pkg/compose/watch.go |  6 ++++++
 2 files changed, 11 insertions(+), 19 deletions(-)

diff --git a/internal/sync/tar.go b/internal/sync/tar.go
index ae7d8517e..050f6ab95 100644
--- a/internal/sync/tar.go
+++ b/internal/sync/tar.go
@@ -47,6 +47,7 @@ type LowLevelClient interface {
 	ContainersForService(ctx context.Context, projectName string, serviceName string) ([]moby.Container, error)
 
 	Exec(ctx context.Context, containerID string, cmd []string, in io.Reader) error
+	Untar(ctx context.Context, id string, reader io.ReadCloser) error
 }
 
 type Tar struct {
@@ -84,39 +85,24 @@ func (t *Tar) Sync(ctx context.Context, service types.ServiceConfig, paths []Pat
 	if len(pathsToDelete) != 0 {
 		deleteCmd = append([]string{"rm", "-rf"}, pathsToDelete...)
 	}
-	copyCmd := []string{"tar", "-v", "-C", "/", "-x", "-f", "-"}
-
 	var eg multierror.Group
-	writers := make([]*io.PipeWriter, len(containers))
 	for i := range containers {
 		containerID := containers[i].ID
-		r, w := io.Pipe()
-		writers[i] = w
+		tarReader := tarArchive(pathsToCopy)
+
 		eg.Go(func() error {
 			if len(deleteCmd) != 0 {
 				if err := t.client.Exec(ctx, containerID, deleteCmd, nil); err != nil {
 					return fmt.Errorf("deleting paths in %s: %w", containerID, err)
 				}
 			}
-			if err := t.client.Exec(ctx, containerID, copyCmd, r); err != nil {
+
+			if err := t.client.Untar(ctx, containerID, tarReader); err != nil {
 				return fmt.Errorf("copying files to %s: %w", containerID, err)
 			}
 			return nil
 		})
 	}
-
-	multiWriter := newLossyMultiWriter(writers...)
-	tarReader := tarArchive(pathsToCopy)
-	defer func() {
-		_ = tarReader.Close()
-		multiWriter.Close()
-	}()
-	_, err = io.Copy(multiWriter, tarReader)
-	if err != nil {
-		return err
-	}
-	multiWriter.Close()
-
 	return eg.Wait().ErrorOrNil()
 }
 
diff --git a/pkg/compose/watch.go b/pkg/compose/watch.go
index 288bc2f85..436b6c5f0 100644
--- a/pkg/compose/watch.go
+++ b/pkg/compose/watch.go
@@ -419,6 +419,12 @@ func (t tarDockerClient) Exec(ctx context.Context, containerID string, cmd []str
 	return nil
 }
 
+func (t tarDockerClient) Untar(ctx context.Context, id string, archive io.ReadCloser) error {
+	return t.s.apiClient().CopyToContainer(ctx, id, "/", archive, moby.CopyToContainerOptions{
+		CopyUIDGID: true,
+	})
+}
+
 func (s *composeService) handleWatchBatch(ctx context.Context, project *types.Project, serviceName string, build api.BuildOptions, batch []fileEvent, syncer sync.Syncer) error {
 	pathMappings := make([]sync.PathMapping, len(batch))
 	restartService := false