Disable all colors in Buildpacks’s output when not in a terminal

Signed-off-by: David Gageot <[email protected]>

go.mod

@@ -71,6 +71,7 @@ require (
 	github.com/krishicks/yaml-patch v0.0.10
 	github.com/markbates/inflect v1.0.4 // indirect
 	github.com/mattbaird/jsonpatch v0.0.0-20171005235357-81af80346b1a // indirect
+	github.com/mattn/go-colorable v0.1.4
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/moby/buildkit v0.6.3
 	github.com/onsi/ginkgo v1.10.3 // indirect

pkg/skaffold/build/buildpacks/lifecycle.go

@@ -22,14 +22,12 @@ import (
 	"strings"
 
 	"github.com/buildpacks/pack"
-	"github.com/heroku/color"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/build/misc"
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/docker"
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/schema/latest"
-	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/util"
 )
 
 // For testing
@@ -85,12 +83,6 @@ func (b *Builder) build(ctx context.Context, out io.Writer, a *latest.Artifact,
 }
 
 func runPackBuild(ctx context.Context, out io.Writer, localDocker docker.LocalDaemon, opts pack.BuildOptions) error {
-	// If out is not a terminal, let's make sure pack doesn't output with colors.
-	if _, isTerm := util.IsTerminal(out); !isTerm {
-		// pack uses heroku/color under the hood.
-		color.Disable(true)
-	}
-
 	packClient, err := pack.NewClient(
 		pack.WithDockerClient(localDocker.RawClient()),
 		pack.WithLogger(NewLogger(out)),

pkg/skaffold/build/buildpacks/logger.go

@@ -20,7 +20,10 @@ import (
 	"io"
 
 	"github.com/buildpacks/pack/logging"
+	"github.com/mattn/go-colorable"
 	"github.com/sirupsen/logrus"
+
+	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/util"
 )
 
 // logger exists to meet the requirements of the pack logger.
@@ -30,12 +33,27 @@ type logger struct {
 }
 
 func NewLogger(out io.Writer) logging.Logger {
+	// If out is not a terminal, let's make sure no colors are printed.
+	if _, isTerm := util.IsTerminal(out); !isTerm {
+		out = colorable.NewNonColorable(out)
+	}
+
+	l := logrus.New()
+	l.SetOutput(out)
+	l.SetFormatter(new(plainFormatter))
+
 	return &logger{
-		Logger: logrus.StandardLogger(),
+		Logger: l,
 		out:    out,
 	}
 }
 
+type plainFormatter struct{}
+
+func (f *plainFormatter) Format(entry *logrus.Entry) ([]byte, error) {
+	return []byte(entry.Message + "\n"), nil
+}
+
 func (l *logger) Debug(msg string) {
 	l.Logger.Debug(msg)
 }