Added image digest file path

cmd/executor/cmd/root.go

@@ -70,6 +70,9 @@ var RootCmd = &cobra.Command{
 			if err := resolveDockerfilePath(); err != nil {
 				return errors.Wrap(err, "error resolving dockerfile path")
 			}
+			if len(opts.Destinations) == 0 && opts.ImageNameDigestFile != "" {
+				return errors.New("You must provide --destination if setting ImageNameDigestFile")
+			}
 		}
 		return nil
 	},
@@ -134,6 +137,7 @@ func addKanikoOptionsFlags(cmd *cobra.Command) {
 	RootCmd.PersistentFlags().StringVarP(&opts.CacheRepo, "cache-repo", "", "", "Specify a repository to use as a cache, otherwise one will be inferred from the destination provided")
 	RootCmd.PersistentFlags().StringVarP(&opts.CacheDir, "cache-dir", "", "/cache", "Specify a local directory to use as a cache.")
 	RootCmd.PersistentFlags().StringVarP(&opts.DigestFile, "digest-file", "", "", "Specify a file to save the digest of the built image to.")
+	RootCmd.PersistentFlags().StringVarP(&opts.ImageNameDigestFile, "image-name-with-digest-file", "", "", "Specify a file to save the image name w/ digest of the built image to.")
 	RootCmd.PersistentFlags().StringVarP(&opts.OCILayoutPath, "oci-layout-path", "", "", "Path to save the OCI image layout of the built image.")
 	RootCmd.PersistentFlags().BoolVarP(&opts.Cache, "cache", "", false, "Use cache when building image")
 	RootCmd.PersistentFlags().BoolVarP(&opts.Cleanup, "cleanup", "", false, "Clean the filesystem at the end")
@@ -240,6 +244,7 @@ func resolveRelativePaths() error {
 		&opts.CacheDir,
 		&opts.TarPath,
 		&opts.DigestFile,
+		&opts.ImageNameDigestFile,
 	}
 
 	for _, p := range optsPaths {

pkg/config/options.go

@@ -37,6 +37,7 @@ type KanikoOptions struct {
 	Target                  string
 	CacheRepo               string
 	DigestFile              string
+	ImageNameDigestFile		string
 	OCILayoutPath           string
 	Destinations            multiArg
 	BuildArgs               multiArg

pkg/executor/push.go

@@ -96,16 +96,27 @@ func CheckPushPermissions(opts *config.KanikoOptions) error {
 	return nil
 }
 
+func getDigest(image v1.Image) ([]byte, error){
+	digest, err := image.Digest()
+	if err != nil {
+		return nil, err
+	}
+	return []byte(digest.String()), nil
+}
+
 // DoPush is responsible for pushing image to the destinations specified in opts
 func DoPush(image v1.Image, opts *config.KanikoOptions) error {
 	t := timing.Start("Total Push Time")
 
 	if opts.DigestFile != "" {
-		digest, err := image.Digest()
+		// digest, err := image.Digest()
+		// if err != nil {
+		// 	return errors.Wrap(err, "error fetching digest")
+		// }
+		digestByteArray, err := getDigest(image)
 		if err != nil {
 			return errors.Wrap(err, "error fetching digest")
 		}
-		digestByteArray := []byte(digest.String())
 		err = ioutil.WriteFile(opts.DigestFile, digestByteArray, 0644)
 		if err != nil {
 			return errors.Wrap(err, "writing digest to file failed")
@@ -128,6 +139,17 @@ func DoPush(image v1.Image, opts *config.KanikoOptions) error {
 		if err != nil {
 			return errors.Wrap(err, "getting tag for destination")
 		}
+		if opts.ImageNameDigestFile != "" {
+			digestByteArray, err := getDigest(image)
+			if err != nil {
+				return errors.Wrap(err, "error fetching digest")
+			}
+			imageName := []byte(destination + "@")
+			err = ioutil.WriteFile(opts.ImageNameDigestFile, append(imageName, digestByteArray...), 0644)
+			if err != nil {
+				return errors.Wrap(err, "writing digest to file failed")
+			}
+		}
 		destRefs = append(destRefs, destRef)
 	}