golangci-lint: enable copyloopvar linter

capturing loop variables is no longer needed in go1.22 and higher;
https://go.dev/blog/loopvar-preview

This path enables the copyloopvar linter, which finds places where capturing
is no longer needed, and removes locations where they could be removed.

Also made some minor changes, and renamed some vars in places where
we could use a shorter name that's less likely to conflict with imports.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.golangci.yml

@@ -5,6 +5,7 @@ linters:
   enable-all: false
   disable-all: true
   enable:
+    - copyloopvar
     - depguard
     - errcheck
     - errorlint

pkg/compose/convergence.go

@@ -205,7 +205,6 @@ func (c *convergence) ensureService(ctx context.Context, project *types.Project,
 		// Scale UP
 		number := next + i
 		name := getContainerName(project.Name, service, number)
-		i := i
 		eventOpts := tracing.SpanOptions{trace.WithAttributes(attribute.String("container.name", name))}
 		eg.Go(tracing.EventWrapFuncForErrGroup(ctx, "service/scale/up", eventOpts, func(ctx context.Context) error {
 			opts := createOptions{
@@ -470,7 +469,6 @@ func (s *composeService) waitDependencies(ctx context.Context, project *types.Pr
 			continue
 		}
 
-		dep, config := dep, config
 		eg.Go(func() error {
 			ticker := time.NewTicker(500 * time.Millisecond)
 			defer ticker.Stop()

pkg/compose/dependencies.go

@@ -172,7 +172,6 @@ func (t *graphTraversal) run(ctx context.Context, graph *Graph, eg *errgroup.Gro
 			continue
 		}
 
-		node := node
 		if !t.consume(node.Key) {
 			// another worker already visited this node
 			continue

pkg/compose/down.go

@@ -322,10 +322,9 @@ func (s *composeService) stopContainer(ctx context.Context, w progress.Writer, s
 
 func (s *composeService) stopContainers(ctx context.Context, w progress.Writer, serv *types.ServiceConfig, containers []moby.Container, timeout *time.Duration) error {
 	eg, ctx := errgroup.WithContext(ctx)
-	for _, container := range containers {
-		container := container
+	for _, ctr := range containers {
 		eg.Go(func() error {
-			return s.stopContainer(ctx, w, serv, container, timeout)
+			return s.stopContainer(ctx, w, serv, ctr, timeout)
 		})
 	}
 	return eg.Wait()
@@ -333,10 +332,9 @@ func (s *composeService) stopContainers(ctx context.Context, w progress.Writer,
 
 func (s *composeService) removeContainers(ctx context.Context, containers []moby.Container, service *types.ServiceConfig, timeout *time.Duration, volumes bool) error {
 	eg, _ := errgroup.WithContext(ctx)
-	for _, container := range containers {
-		container := container
+	for _, ctr := range containers {
 		eg.Go(func() error {
-			return s.stopAndRemoveContainer(ctx, container, service, timeout, volumes)
+			return s.stopAndRemoveContainer(ctx, ctr, service, timeout, volumes)
 		})
 	}
 	return eg.Wait()

pkg/compose/image_pruner.go

@@ -202,7 +202,6 @@ func (p *ImagePruner) filterImagesByExistence(ctx context.Context, imageNames []
 
 	eg, ctx := errgroup.WithContext(ctx)
 	for _, img := range imageNames {
-		img := img
 		eg.Go(func() error {
 			_, _, err := p.client.ImageInspectWithRaw(ctx, img)
 			if errdefs.IsNotFound(err) {

pkg/compose/images.go

@@ -82,7 +82,6 @@ func (s *composeService) getImageSummaries(ctx context.Context, repoTags []strin
 	l := sync.Mutex{}
 	eg, ctx := errgroup.WithContext(ctx)
 	for _, repoTag := range repoTags {
-		repoTag := repoTag
 		eg.Go(func() error {
 			inspect, _, err := s.apiClient().ImageInspectWithRaw(ctx, repoTag)
 			if err != nil {

pkg/compose/logs.go

@@ -62,13 +62,12 @@ func (s *composeService) Logs(
 	}
 
 	eg, ctx := errgroup.WithContext(ctx)
-	for _, c := range containers {
-		c := c
+	for _, ctr := range containers {
 		eg.Go(func() error {
-			err := s.logContainers(ctx, consumer, c, options)
+			err := s.logContainers(ctx, consumer, ctr, options)
 			var notImplErr errdefs.ErrNotImplemented
 			if errors.As(err, &notImplErr) {
-				logrus.Warnf("Can't retrieve logs for %q: %s", getCanonicalContainerName(c), err.Error())
+				logrus.Warnf("Can't retrieve logs for %q: %s", getCanonicalContainerName(ctr), err.Error())
 				return nil
 			}
 			return err

pkg/compose/logs_test.go

@@ -134,7 +134,6 @@ func TestComposeService_Logs_ServiceFiltering(t *testing.T) {
 	)
 
 	for _, id := range []string{"c1", "c2", "c4"} {
-		id := id
 		api.EXPECT().
 			ContainerInspect(anyCancellableContext(), id).
 			Return(

pkg/compose/ps.go

@@ -43,7 +43,6 @@ func (s *composeService) Ps(ctx context.Context, projectName string, options api
 	summary := make([]api.ContainerSummary, len(containers))
 	eg, ctx := errgroup.WithContext(ctx)
 	for i, container := range containers {
-		i, container := i, container
 		eg.Go(func() error {
 			publishers := make([]api.PortPublisher, len(container.Ports))
 			sort.Slice(container.Ports, func(i, j int) bool {

pkg/compose/pull.go

@@ -113,7 +113,7 @@ func (s *composeService) pull(ctx context.Context, project *types.Project, opts
 
 		imagesBeingPulled[service.Image] = service.Name
 
-		idx, name, service := i, name, service
+		idx := i
 		eg.Go(func() error {
 			_, err := s.pullServiceImage(ctx, service, s.configFile(), w, opts.Quiet, project.Environment["DOCKER_DEFAULT_PLATFORM"])
 			if err != nil {
@@ -316,7 +316,6 @@ func (s *composeService) pullRequiredImages(ctx context.Context, project *types.
 		eg.SetLimit(s.maxConcurrency)
 		pulledImages := make([]string, len(needPull))
 		for i, service := range needPull {
-			i, service := i, service
 			eg.Go(func() error {
 				id, err := s.pullServiceImage(ctx, service, s.configFile(), w, quietPull, project.Environment["DOCKER_DEFAULT_PLATFORM"])
 				pulledImages[i] = id

pkg/compose/push.go

@@ -72,14 +72,12 @@ func (s *composeService) push(ctx context.Context, project *types.Project, optio
 			})
 			continue
 		}
-		service := service
 		tags := []string{service.Image}
 		if service.Build != nil {
 			tags = append(tags, service.Build.Tags...)
 		}
 
 		for _, tag := range tags {
-			tag := tag
 			eg.Go(func() error {
 				err := s.pushServiceImage(ctx, tag, info, s.configFile(), w, options.Quiet)
 				if err != nil {

pkg/compose/remove.go

@@ -102,12 +102,11 @@ func (s *composeService) Remove(ctx context.Context, projectName string, options
 func (s *composeService) remove(ctx context.Context, containers Containers, options api.RemoveOptions) error {
 	w := progress.ContextWriter(ctx)
 	eg, ctx := errgroup.WithContext(ctx)
-	for _, container := range containers {
-		container := container
+	for _, ctr := range containers {
 		eg.Go(func() error {
-			eventName := getContainerProgressName(container)
+			eventName := getContainerProgressName(ctr)
 			w.Event(progress.RemovingEvent(eventName))
-			err := s.apiClient().ContainerRemove(ctx, container.ID, containerType.RemoveOptions{
+			err := s.apiClient().ContainerRemove(ctx, ctr.ID, containerType.RemoveOptions{
 				RemoveVolumes: options.Volumes,
 				Force:         options.Force,
 			})

pkg/compose/restart.go

@@ -78,17 +78,17 @@ func (s *composeService) restart(ctx context.Context, projectName string, option
 	w := progress.ContextWriter(ctx)
 	return InDependencyOrder(ctx, project, func(c context.Context, service string) error {
 		eg, ctx := errgroup.WithContext(ctx)
-		for _, container := range containers.filter(isService(service)) {
-			container := container
+		for _, ctr := range containers.filter(isService(service)) {
 			eg.Go(func() error {
-				eventName := getContainerProgressName(container)
+				eventName := getContainerProgressName(ctr)
 				w.Event(progress.RestartingEvent(eventName))
 				timeout := utils.DurationSecondToInt(options.Timeout)
-				err := s.apiClient().ContainerRestart(ctx, container.ID, containerType.StopOptions{Timeout: timeout})
-				if err == nil {
-					w.Event(progress.StartedEvent(eventName))
+				err := s.apiClient().ContainerRestart(ctx, ctr.ID, containerType.StopOptions{Timeout: timeout})
+				if err != nil {
+					return err
 				}
-				return err
+				w.Event(progress.StartedEvent(eventName))
+				return nil
 			})
 		}
 		return eg.Wait()

pkg/compose/top.go

@@ -36,16 +36,15 @@ func (s *composeService) Top(ctx context.Context, projectName string, services [
 	}
 	summary := make([]api.ContainerProcSummary, len(containers))
 	eg, ctx := errgroup.WithContext(ctx)
-	for i, container := range containers {
-		i, container := i, container
+	for i, ctr := range containers {
 		eg.Go(func() error {
-			topContent, err := s.apiClient().ContainerTop(ctx, container.ID, []string{})
+			topContent, err := s.apiClient().ContainerTop(ctx, ctr.ID, []string{})
 			if err != nil {
 				return err
 			}
 			summary[i] = api.ContainerProcSummary{
-				ID:        container.ID,
-				Name:      getCanonicalContainerName(container),
+				ID:        ctr.ID,
+				Name:      getCanonicalContainerName(ctr),
 				Processes: topContent.Processes,
 				Titles:    topContent.Titles,
 			}

pkg/compose/viz.go

@@ -31,7 +31,6 @@ type vizGraph map[*types.ServiceConfig][]*types.ServiceConfig
 func (s *composeService) Viz(_ context.Context, project *types.Project, opts api.VizOptions) (string, error) {
 	graph := make(vizGraph)
 	for _, service := range project.Services {
-		service := service
 		graph[&service] = make([]*types.ServiceConfig, 0, len(service.DependsOn))
 		for dependencyName := range service.DependsOn {
 			// no error should be returned since dependencyName should exist

pkg/compose/wait.go

@@ -35,15 +35,14 @@ func (s *composeService) Wait(ctx context.Context, projectName string, options a
 
 	eg, waitCtx := errgroup.WithContext(ctx)
 	var statusCode int64
-	for _, c := range containers {
-		c := c
+	for _, ctr := range containers {
 		eg.Go(func() error {
 			var err error
-			resultC, errC := s.dockerCli.Client().ContainerWait(waitCtx, c.ID, "")
+			resultC, errC := s.dockerCli.Client().ContainerWait(waitCtx, ctr.ID, "")
 
 			select {
 			case result := <-resultC:
-				_, _ = fmt.Fprintf(s.dockerCli.Out(), "container %q exited with status code %d\n", c.ID, result.StatusCode)
+				_, _ = fmt.Fprintf(s.dockerCli.Out(), "container %q exited with status code %d\n", ctr.ID, result.StatusCode)
 				statusCode = result.StatusCode
 			case err = <-errC:
 			}