From 466e1d31975670fc839c7d6c8ae08ea62ee7152d Mon Sep 17 00:00:00 2001
From: Nicolas De Loof <nicolas.deloof@gmail.com>
Date: Thu, 25 May 2023 15:33:43 +0200
Subject: [PATCH] prevent buildkt's progress to render `Building` when no built
 is needed

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
---
 pkg/compose/build.go      | 31 +++++++++++++++++++------------
 pkg/compose/build_test.go |  8 ++++----
 pkg/compose/watch.go      |  2 +-
 3 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/pkg/compose/build.go b/pkg/compose/build.go
index 5fc5aec6b..d6f5a1e92 100644
--- a/pkg/compose/build.go
+++ b/pkg/compose/build.go
@@ -68,6 +68,7 @@ func (s *composeService) build(ctx context.Context, project *types.Project, opti
 	// build and will lock
 	progressCtx, cancel := context.WithCancel(context.Background())
 	defer cancel()
+
 	w, err := xprogress.NewPrinter(progressCtx, s.stdout(), os.Stdout, options.Progress)
 	if err != nil {
 		return nil, err
@@ -175,20 +176,24 @@ func (s *composeService) ensureImagesExists(ctx context.Context, project *types.
 		mode = xprogress.PrinterModeQuiet
 	}
 
-	err = s.prepareProjectForBuild(project, images)
-	if err != nil {
-		return err
-	}
-	builtImages, err := s.build(ctx, project, api.BuildOptions{
-		Progress: mode,
-	})
+	buildRequired, err := s.prepareProjectForBuild(project, images)
 	if err != nil {
 		return err
 	}
 
-	for name, digest := range builtImages {
-		images[name] = digest
+	if buildRequired {
+		builtImages, err := s.build(ctx, project, api.BuildOptions{
+			Progress: mode,
+		})
+		if err != nil {
+			return err
+		}
+
+		for name, digest := range builtImages {
+			images[name] = digest
+		}
 	}
+
 	// set digest as com.docker.compose.image label so we can detect outdated containers
 	for i, service := range project.Services {
 		image := api.GetImageNameOrDefault(service, project.Name)
@@ -203,10 +208,11 @@ func (s *composeService) ensureImagesExists(ctx context.Context, project *types.
 	return nil
 }
 
-func (s *composeService) prepareProjectForBuild(project *types.Project, images map[string]string) error {
+func (s *composeService) prepareProjectForBuild(project *types.Project, images map[string]string) (bool, error) {
+	buildRequired := false
 	err := api.BuildOptions{}.Apply(project)
 	if err != nil {
-		return err
+		return false, err
 	}
 	for i, service := range project.Services {
 		if service.Build == nil {
@@ -227,8 +233,9 @@ func (s *composeService) prepareProjectForBuild(project *types.Project, images m
 			service.Build.Platforms = []string{service.Platform}
 		}
 		project.Services[i] = service
+		buildRequired = true
 	}
-	return nil
+	return buildRequired, nil
 }
 
 func (s *composeService) getLocalImagesDigests(ctx context.Context, project *types.Project) (map[string]string, error) {
diff --git a/pkg/compose/build_test.go b/pkg/compose/build_test.go
index 145118a5c..d71c710f0 100644
--- a/pkg/compose/build_test.go
+++ b/pkg/compose/build_test.go
@@ -44,7 +44,7 @@ func TestPrepareProjectForBuild(t *testing.T) {
 		}
 
 		s := &composeService{}
-		err := s.prepareProjectForBuild(&project, nil)
+		_, err := s.prepareProjectForBuild(&project, nil)
 		assert.NilError(t, err)
 		assert.DeepEqual(t, project.Services[0].Build.Platforms, types.StringList{"alice/32"})
 	})
@@ -70,7 +70,7 @@ func TestPrepareProjectForBuild(t *testing.T) {
 		}
 
 		s := &composeService{}
-		err := s.prepareProjectForBuild(&project, nil)
+		_, err := s.prepareProjectForBuild(&project, nil)
 		assert.NilError(t, err)
 		assert.DeepEqual(t, project.Services[0].Build.Platforms, types.StringList{"linux/amd64"})
 	})
@@ -89,7 +89,7 @@ func TestPrepareProjectForBuild(t *testing.T) {
 		}
 
 		s := &composeService{}
-		err := s.prepareProjectForBuild(&project, map[string]string{"foo": "exists"})
+		_, err := s.prepareProjectForBuild(&project, map[string]string{"foo": "exists"})
 		assert.NilError(t, err)
 		assert.Check(t, project.Services[0].Build == nil)
 	})
@@ -115,7 +115,7 @@ func TestPrepareProjectForBuild(t *testing.T) {
 		}
 
 		s := &composeService{}
-		err := s.prepareProjectForBuild(&project, nil)
+		_, err := s.prepareProjectForBuild(&project, nil)
 		assert.Check(t, err != nil)
 	})
 }
diff --git a/pkg/compose/watch.go b/pkg/compose/watch.go
index 682f14d95..24b2350ee 100644
--- a/pkg/compose/watch.go
+++ b/pkg/compose/watch.go
@@ -79,7 +79,7 @@ func (s *composeService) Watch(ctx context.Context, project *types.Project, serv
 	needRebuild := make(chan fileMapping)
 	needSync := make(chan fileMapping)
 
-	err := s.prepareProjectForBuild(project, nil)
+	_, err := s.prepareProjectForBuild(project, nil)
 	if err != nil {
 		return err
 	}