fix perfsprint (concat-loop) linting

cli/cobra.go

@@ -250,11 +250,12 @@ func commandAliases(cmd *cobra.Command) string {
 	if cmd.HasParent() {
 		parentPath = cmd.Parent().CommandPath() + " "
 	}
-	aliases := cmd.CommandPath()
+	var aliases strings.Builder
+	aliases.WriteString(cmd.CommandPath())
 	for _, alias := range cmd.Aliases {
-		aliases += ", " + parentPath + alias
+		aliases.WriteString(", " + parentPath + alias)
 	}
-	return aliases
+	return aliases.String()
 }
 
 func topCommands(cmd *cobra.Command) []*cobra.Command {

cli/command/container/prune.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"strings"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -61,7 +62,7 @@ func newPruneCommand(dockerCLI command.Cli) *cobra.Command {
 const warning = `WARNING! This will remove all stopped containers.
 Are you sure you want to continue?`
 
-func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions) (spaceReclaimed uint64, output string, err error) {
+func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions) (spaceReclaimed uint64, output string, _ error) {
 	pruneFilters := command.PruneFilters(dockerCli, options.filter.Value())
 
 	if !options.force {
@@ -81,15 +82,16 @@ func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions)
 		return 0, "", err
 	}
 
+	var out strings.Builder
 	if len(res.Report.ContainersDeleted) > 0 {
-		output = "Deleted Containers:\n"
+		out.WriteString("Deleted Containers:\n")
 		for _, id := range res.Report.ContainersDeleted {
-			output += id + "\n"
+			out.WriteString(id + "\n")
 		}
 		spaceReclaimed = res.Report.SpaceReclaimed
 	}
 
-	return spaceReclaimed, output, nil
+	return spaceReclaimed, out.String(), nil
 }
 
 type cancelledErr struct{ error }

cli/command/image/tree.go

@@ -297,15 +297,15 @@ func printImageTree(outs command.Streams, view treeView) {
 			}(),
 			Color: &tui.ColorNone,
 			DetailsValue: func(d *imageDetails) string {
-				var out string
+				var b strings.Builder
 				for _, chip := range possibleChips {
 					if chip.check(d) {
-						out += chip.String(isTerm)
+						b.WriteString(chip.String(isTerm))
 					} else {
-						out += chipPlaceholder.String(isTerm)
+						b.WriteString(chipPlaceholder.String(isTerm))
 					}
 				}
-				return out
+				return b.String()
 			},
 		},
 	}
@@ -368,12 +368,14 @@ func adjustColumns(width uint, columns []imgColumn, images []topImage) []imgColu
 func generateLegend(out tui.Output, width uint) string {
 	var legend string
 	legend += out.Sprint(tui.InfoHeader)
+	var legendSb371 strings.Builder
 	for idx, chip := range allChips {
-		legend += " " + out.Sprint(chip) + " " + chip.desc
+		legendSb371.WriteString(" " + out.Sprint(chip) + " " + chip.desc)
 		if idx < len(allChips)-1 {
-			legend += " |"
+			legendSb371.WriteString(" |")
 		}
 	}
+	legend += legendSb371.String()
 
 	r := int(width) - tui.Width(legend)
 	if r < 0 {

cli/command/network/prune.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"strings"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -58,7 +59,7 @@ func newPruneCommand(dockerCLI command.Cli) *cobra.Command {
 const warning = `WARNING! This will remove all custom networks not used by at least one container.
 Are you sure you want to continue?`
 
-func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions) (output string, err error) {
+func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions) (output string, _ error) {
 	pruneFilters := command.PruneFilters(dockerCli, options.filter.Value())
 
 	if !options.force {
@@ -78,14 +79,15 @@ func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions)
 		return "", err
 	}
 
+	var out strings.Builder
 	if len(res.Report.NetworksDeleted) > 0 {
-		output = "Deleted Networks:\n"
+		out.WriteString("Deleted Networks:\n")
 		for _, id := range res.Report.NetworksDeleted {
-			output += id + "\n"
+			out.WriteString(id + "\n")
 		}
 	}
 
-	return output, nil
+	return out.String(), nil
 }
 
 type cancelledErr struct{ error }

cli/command/volume/prune.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"strings"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
@@ -68,7 +69,7 @@ Are you sure you want to continue?`
 Are you sure you want to continue?`
 )
 
-func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions) (spaceReclaimed uint64, output string, err error) {
+func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions) (spaceReclaimed uint64, output string, _ error) {
 	pruneFilters := command.PruneFilters(dockerCli, options.filter.Value())
 
 	warning := unusedVolumesWarning
@@ -96,15 +97,16 @@ func runPrune(ctx context.Context, dockerCli command.Cli, options pruneOptions)
 		return 0, "", err
 	}
 
+	var out strings.Builder
 	if len(res.Report.VolumesDeleted) > 0 {
-		output = "Deleted Volumes:\n"
+		out.WriteString("Deleted Volumes:\n")
 		for _, id := range res.Report.VolumesDeleted {
-			output += id + "\n"
+			out.WriteString(id + "\n")
 		}
 		spaceReclaimed = res.Report.SpaceReclaimed
 	}
 
-	return spaceReclaimed, output, nil
+	return spaceReclaimed, out.String(), nil
 }
 
 type invalidParamErr struct{ error }