adding reproducible flag

cmd/executor/cmd/root.go

@@ -40,6 +40,7 @@ var (
 	force                       bool
 	buildArgs                   multiArg
 	tarPath                     string
+	reproducible                bool
 )
 
 func init() {
@@ -54,6 +55,7 @@ func init() {
 	RootCmd.PersistentFlags().StringVarP(&logLevel, "verbosity", "v", constants.DefaultLogLevel, "Log level (debug, info, warn, error, fatal, panic")
 	RootCmd.PersistentFlags().BoolVarP(&force, "force", "", false, "Force building outside of a container")
 	RootCmd.PersistentFlags().StringVarP(&tarPath, "tarPath", "", "", "Path to save the image in as a tarball instead of pushing")
+	RootCmd.PersistentFlags().BoolVarP(&reproducible, "reproducible", "", false, "Strip timestamps out of the image to make it reproducible")
 }
 
 var RootCmd = &cobra.Command{
@@ -79,7 +81,7 @@ var RootCmd = &cobra.Command{
 			logrus.Error(err)
 			os.Exit(1)
 		}
-		ref, image, err := executor.DoBuild(dockerfilePath, srcContext, snapshotMode, buildArgs)
+		ref, image, err := executor.DoBuild(dockerfilePath, srcContext, snapshotMode, buildArgs, reproducible)
 		if err != nil {
 			logrus.Error(err)
 			os.Exit(1)

integration/dockerfiles/Dockerfile_test_copy_reproducible

@@ -0,0 +1,20 @@
+FROM alpine:3.7
+COPY context/foo foo
+COPY context/foo /foodir/
+COPY context/bar/b* bar/
+COPY context/fo? /foo2
+COPY context/bar/doesnotexist* context/foo hello
+COPY ./context/empty /empty
+COPY ./ dir/
+COPY . newdir
+COPY context/bar /baz/
+COPY ["context/foo", "/tmp/foo" ]
+COPY context/b* /baz/
+COPY context/foo context/bar/ba? /test/
+COPY context/arr[[]0].txt /mydir/
+COPY context/bar/bat .
+
+ENV contextenv ./context
+COPY ${contextenv}/foo /tmp/foo2
+COPY $contextenv/foo /tmp/foo3
+COPY $contextenv/* /tmp/${contextenv}/

integration/integration_test.go

@@ -108,6 +108,8 @@ func TestRun(t *testing.T) {
 
 	bucketContextTests := []string{"Dockerfile_test_copy_bucket"}
 
+	reproducibleTests := []string{"Dockerfile_test_env"}
+
 	// TODO: remove test_user_run from this when https://github.com/GoogleContainerTools/container-diff/issues/237 is fixed
 	testsToIgnore := []string{"Dockerfile_test_user_run"}
 
@@ -151,6 +153,14 @@ func TestRun(t *testing.T) {
 				}
 			}
 
+			reproducibleFlag := ""
+			for _, d := range reproducibleTests {
+				if d == dockerfile {
+					reproducibleFlag = "--reproducible"
+					break
+				}
+			}
+
 			// build kaniko image
 			kanikoImage := strings.ToLower(testRepo + kanikoPrefix + dockerfile)
 			kanikoCmd := exec.Command("docker",
@@ -159,7 +169,7 @@ func TestRun(t *testing.T) {
 					"-v", cwd + ":/workspace",
 					executorImage,
 					"-f", path.Join(buildContextPath, dockerfilesPath, dockerfile),
-					"-d", kanikoImage,
+					"-d", kanikoImage, reproducibleFlag,
 					contextFlag, contextPath},
 					buildArgs...)...,
 			)

pkg/dockerfile/dockerfile.go

@@ -108,7 +108,7 @@ func Dependencies(index int, stages []instructions.Stage, buildArgs *BuildArgs)
 			if err != nil {
 				return nil, err
 			}
-			sourceImage, err = remote.Image(ref, auth, http.DefaultTransport)
+			sourceImage, err = remote.Image(ref, remote.WithAuth(auth), remote.WithTransport(http.DefaultTransport))
 			if err != nil {
 				return nil, err
 			}

pkg/executor/executor.go

@@ -45,7 +45,7 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-func DoBuild(dockerfilePath, srcContext, snapshotMode string, args []string) (name.Reference, v1.Image, error) {
+func DoBuild(dockerfilePath, srcContext, snapshotMode string, args []string, reproducible bool) (name.Reference, v1.Image, error) {
 	// Parse dockerfile and unpack base image to root
 	d, err := ioutil.ReadFile(dockerfilePath)
 	if err != nil {
@@ -85,7 +85,7 @@ func DoBuild(dockerfilePath, srcContext, snapshotMode string, args []string) (na
 			if err != nil {
 				return nil, nil, err
 			}
-			sourceImage, err = remote.Image(ref, auth, http.DefaultTransport)
+			sourceImage, err = remote.Image(ref, remote.WithAuth(auth), remote.WithTransport(http.DefaultTransport))
 			if err != nil {
 				return nil, nil, err
 			}
@@ -161,6 +161,14 @@ func DoBuild(dockerfilePath, srcContext, snapshotMode string, args []string) (na
 			if err != nil {
 				return nil, nil, err
 			}
+
+			if reproducible {
+				sourceImage, err = mutate.Canonical(sourceImage)
+				if err != nil {
+					return nil, nil, err
+				}
+			}
+
 			return ref, sourceImage, nil
 		}
 		if err := saveStageDependencies(index, stages, buildArgs.Clone()); err != nil {