build: change --no-console to --console=[true|false|auto]

Signed-off-by: Tibor Vass <tibor@docker.com>

cli/command/image/build.go

@@ -57,7 +57,7 @@ type buildOptions struct {
 	isolation      string
 	quiet          bool
 	noCache        bool
-	noConsole      bool
+	console        opts.NullableBool
 	rm             bool
 	forceRm        bool
 	pull           bool
@@ -152,9 +152,9 @@ func NewBuildCommand(dockerCli command.Cli) *cobra.Command {
 	flags.SetAnnotation("stream", "experimental", nil)
 	flags.SetAnnotation("stream", "version", []string{"1.31"})
 
-	flags.BoolVar(&options.noConsole, "no-console", false, "Show non-console output (with buildkit only)")
-	flags.SetAnnotation("no-console", "experimental", nil)
-	flags.SetAnnotation("no-console", "version", []string{"1.38"})
+	flags.Var(&options.console, "console", "Show console output (with buildkit only) (true, false, auto)")
+	flags.SetAnnotation("console", "experimental", nil)
+	flags.SetAnnotation("console", "version", []string{"1.38"})
 	return cmd
 }
 

cli/command/image/build_buildkit.go

@@ -191,7 +191,9 @@ func doBuild(ctx context.Context, eg *errgroup.Group, dockerCli command.Cli, opt
 	displayStatus := func(displayCh chan *client.SolveStatus) {
 		var c console.Console
 		out := os.Stderr
-		if cons, err := console.ConsoleFromFile(out); err == nil && !options.noConsole {
+		// TODO: Handle interactive output in non-interactive environment.
+		consoleOpt := options.console.Value()
+		if cons, err := console.ConsoleFromFile(out); err == nil && (consoleOpt == nil || *consoleOpt) {
 			c = cons
 		}
 		// not using shared context to not disrupt display but let is finish reporting errors

opts/opts.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"path"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/docker/docker/api/types/filters"
@@ -486,3 +487,38 @@ func (m *MemSwapBytes) UnmarshalJSON(s []byte) error {
 	b := MemBytes(*m)
 	return b.UnmarshalJSON(s)
 }
+
+// NullableBool is a type for tri-state boolean options
+type NullableBool struct {
+	b *bool
+}
+
+// Type returns the type
+func (n *NullableBool) Type() string {
+	return ""
+}
+
+// Value returns the value in *bool
+func (n *NullableBool) Value() *bool {
+	return n.b
+}
+
+// Set sets the value. If value is empty string or "auto", nil is set.
+// Otherwise true or false are set based on flag.Bool behavior.
+func (n *NullableBool) Set(value string) error {
+	if value != "auto" && value != "" {
+		b, err := strconv.ParseBool(value)
+		if err != nil {
+			return err
+		}
+		n.b = &b
+	}
+	return nil
+}
+
+func (n *NullableBool) String() string {
+	if n.b == nil {
+		return "auto"
+	}
+	return strconv.FormatBool(*n.b)
+}