Remove duplicate compute of image name & add unit test

Signed-off-by: Guillaume Tardif <guillaume.tardif@gmail.com>

local/compose/build.go

@@ -36,7 +36,7 @@ func (s *composeService) Build(ctx context.Context, project *types.Project) erro
 	opts := map[string]build.Options{}
 	for _, service := range project.Services {
 		if service.Build != nil {
-			imageName := getImageName(service, project)
+			imageName := getImageName(service, project.Name)
 			opts[imageName] = s.toBuildOptions(service, project.WorkingDir, imageName)
 		}
 	}
@@ -44,14 +44,6 @@ func (s *composeService) Build(ctx context.Context, project *types.Project) erro
 	return s.build(ctx, project, opts)
 }
 
-func getImageName(service types.ServiceConfig, project *types.Project) string {
-	imageName := service.Image
-	if imageName == "" {
-		imageName = project.Name + "_" + service.Name
-	}
-	return imageName
-}
-
 func (s *composeService) ensureImagesExists(ctx context.Context, project *types.Project) error {
 	opts := map[string]build.Options{}
 	for _, service := range project.Services {
@@ -59,7 +51,7 @@ func (s *composeService) ensureImagesExists(ctx context.Context, project *types.
 			return fmt.Errorf("invalid service %q. Must specify either image or build", service.Name)
 		}
 
-		imageName := getImageName(service, project)
+		imageName := getImageName(service, project.Name)
 		localImagePresent, err := s.localImagePresent(ctx, imageName)
 		if err != nil {
 			return err

local/compose/create.go

@@ -123,6 +123,14 @@ func (s *composeService) ensureProjectVolumes(ctx context.Context, project *type
 	return nil
 }
 
+func getImageName(service types.ServiceConfig, projectName string) string {
+	imageName := service.Image
+	if imageName == "" {
+		imageName = projectName + "_" + service.Name
+	}
+	return imageName
+}
+
 func getCreateOptions(p *types.Project, s types.ServiceConfig, number int, inherit *moby.Container, autoRemove bool) (*container.Config, *container.HostConfig, *network.NetworkingConfig, error) {
 	hash, err := jsonHash(s)
 	if err != nil {
@@ -155,10 +163,6 @@ func getCreateOptions(p *types.Project, s types.ServiceConfig, number int, inher
 	if len(s.Entrypoint) > 0 {
 		entrypoint = strslice.StrSlice(s.Entrypoint)
 	}
-	image := s.Image
-	if s.Image == "" {
-		image = fmt.Sprintf("%s_%s", p.Name, s.Name)
-	}
 
 	var (
 		tty         = s.Tty
@@ -178,7 +182,7 @@ func getCreateOptions(p *types.Project, s types.ServiceConfig, number int, inher
 		AttachStderr:    true,
 		AttachStdout:    true,
 		Cmd:             runCmd,
-		Image:           image,
+		Image:           getImageName(s, p.Name),
 		WorkingDir:      s.WorkingDir,
 		Entrypoint:      entrypoint,
 		NetworkDisabled: s.NetworkMode == "disabled",

local/compose/create_test.go

@@ -21,6 +21,7 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/compose-spec/compose-go/types"
 	composetypes "github.com/compose-spec/compose-go/types"
 	mountTypes "github.com/docker/docker/api/types/mount"
 	"gotest.tools/v3/assert"
@@ -60,3 +61,8 @@ func TestBuildVolumeMount(t *testing.T) {
 	assert.Equal(t, mount.Source, "myProject_myVolume")
 	assert.Equal(t, mount.Type, mountTypes.TypeVolume)
 }
+
+func TestServiceImageName(t *testing.T) {
+	assert.Equal(t, getImageName(types.ServiceConfig{Image: "myImage"}, "myProject"), "myImage")
+	assert.Equal(t, getImageName(types.ServiceConfig{Name: "aService"}, "myProject"), "myProject_aService")
+}