update test

* add digest as output variable for kaniko plugin

.drone.yml

@@ -77,14 +77,14 @@ steps:
       exclude:
       - pull_request
 
-- name: docker-kaniko-v1-8
+- name: docker-kaniko-v1-9
   image: plugins/docker
   settings:
     repo: plugins/kaniko
     auto_tag: true
-    auto_tag_suffix: linux-amd64-kaniko1.8.1
+    auto_tag_suffix: linux-amd64-kaniko1.9.1
     daemon_off: false
-    dockerfile: docker/docker/Dockerfile.linux.amd64.kaniko1.8.1
+    dockerfile: docker/docker/Dockerfile.linux.amd64.kaniko1.9.1
     username:
       from_secret: docker_username
     password:
@@ -94,14 +94,14 @@ steps:
       exclude:
       - pull_request
 
-- name: gcr-kaniko-v1-8
+- name: gcr-kaniko-v1-9
   image: plugins/docker
   settings:
     repo: plugins/kaniko-gcr
     auto_tag: true
-    auto_tag_suffix: linux-amd64-kaniko1.8.1
+    auto_tag_suffix: linux-amd64-kaniko1.9.1
     daemon_off: false
-    dockerfile: docker/gcr/Dockerfile.linux.amd64.kaniko1.8.1
+    dockerfile: docker/gcr/Dockerfile.linux.amd64.kaniko1.9.1
     username:
       from_secret: docker_username
     password:
@@ -112,14 +112,14 @@ steps:
       - pull_request
 
 
-- name: ecr-kaniko-v1-8
+- name: ecr-kaniko-v1-9
   image: plugins/docker
   settings:
     repo: plugins/kaniko-ecr
     auto_tag: true
-    auto_tag_suffix: linux-amd64-kaniko1.8.1
+    auto_tag_suffix: linux-amd64-kaniko1.9.1
     daemon_off: false
-    dockerfile: docker/ecr/Dockerfile.linux.amd64.kaniko1.8.1
+    dockerfile: docker/ecr/Dockerfile.linux.amd64.kaniko1.9.1
     username:
       from_secret: docker_username
     password:
@@ -130,12 +130,11 @@ steps:
       - pull_request
 ---
 kind: pipeline
-type: docker
+type: vm
 name: arm
 
-platform:
+pool:
-  os: linux
+  use: ubuntu_arm64
-  arch: arm64
 
 steps:
 - name: build
@@ -212,14 +211,14 @@ steps:
       exclude:
       - pull_request
 
-- name: docker-kaniko-v1-8
+- name: docker-kaniko-v1-9
   image: plugins/docker
   settings:
     repo: plugins/kaniko
     auto_tag: true
-    auto_tag_suffix: linux-arm64-kaniko1.8.1
+    auto_tag_suffix: linux-arm64-kaniko1.9.1
     daemon_off: false
-    dockerfile: docker/docker/Dockerfile.linux.arm64.kaniko1.8.1
+    dockerfile: docker/docker/Dockerfile.linux.arm64.kaniko1.9.1
     username:
       from_secret: docker_username
     password:
@@ -229,14 +228,14 @@ steps:
       exclude:
       - pull_request
 
-- name: gcr-kaniko-v1-8
+- name: gcr-kaniko-v1-9
   image: plugins/docker
   settings:
     repo: plugins/kaniko-gcr
     auto_tag: true
-    auto_tag_suffix: linux-arm64-kaniko1.8.1
+    auto_tag_suffix: linux-arm64-kaniko1.9.1
     daemon_off: false
-    dockerfile: docker/gcr/Dockerfile.linux.arm64.kaniko1.8.1
+    dockerfile: docker/gcr/Dockerfile.linux.arm64.kaniko1.9.1
     username:
       from_secret: docker_username
     password:
@@ -247,14 +246,14 @@ steps:
       - pull_request
 
 
-- name: ecr-kaniko-v1-8
+- name: ecr-kaniko-v1-9
   image: plugins/docker
   settings:
     repo: plugins/kaniko-ecr
     auto_tag: true
-    auto_tag_suffix: linux-arm64-kaniko1.8.1
+    auto_tag_suffix: linux-arm64-kaniko1.9.1
     daemon_off: false
-    dockerfile: docker/ecr/Dockerfile.linux.arm64.kaniko1.8.1
+    dockerfile: docker/ecr/Dockerfile.linux.arm64.kaniko1.9.1
     username:
       from_secret: docker_username
     password:
@@ -348,7 +347,7 @@ steps:
     ignore_missing: true
     password:
       from_secret: docker_password
-    spec: docker/docker/manifest-kaniko1.8.1.tmpl
+    spec: docker/docker/manifest-kaniko1.9.1.tmpl
     username:
       from_secret: docker_username
 
@@ -360,7 +359,7 @@ steps:
     ignore_missing: true
     password:
       from_secret: docker_password
-    spec: docker/gcr/manifest-kaniko1.8.1.tmpl
+    spec: docker/gcr/manifest-kaniko1.9.1.tmpl
     username:
       from_secret: docker_username
 
@@ -372,7 +371,7 @@ steps:
     ignore_missing: true
     password:
       from_secret: docker_password
-    spec: docker/ecr/manifest-kaniko1.8.1.tmpl
+    spec: docker/ecr/manifest-kaniko1.9.1.tmpl
     username:
       from_secret: docker_username
 

README.md

@@ -2,7 +2,7 @@
 
 Drone kaniko plugin uses [kaniko](https://github.com/GoogleContainerTools/kaniko) to build and publish Docker images to a container registry.
 
-Plugin images are published with 1.6.0 as well as 1.8.1 kaniko version from 1.5.1 release tag. `plugins/kaniko:<release-tag>` uses 1.6.0 version while `plugins/kaniko:<release-tag>-kaniko1.8.1` uses 1.8.1 version. Similar convention is used for plugins/kaniko-ecr & plugins/kaniko-gcr images as well.
+Plugin images are published with 1.6.0 as well as 1.9.1 kaniko version from 1.5.1 release tag. `plugins/kaniko:<release-tag>` uses 1.6.0 version while `plugins/kaniko:<release-tag>-kaniko1.9.1` uses 1.9.1 version. Similar convention is used for plugins/kaniko-ecr & plugins/kaniko-gcr images as well.
 
 ## Build
 
@@ -135,4 +135,4 @@ docker run --rm \
 ```
 
 Tags to push:
-- latest
+- latest.

cmd/kaniko-docker/main.go

@@ -91,9 +91,9 @@ func main() {
 			EnvVar: "PLUGIN_AUTO_TAG",
 		},
 		cli.StringFlag{
-			Name:   "dockerconfig-override",
+			Name:   "dockerconfig",
-			Usage:  "use provided docker config override for docker auth",
+			Usage:  "docker json dockerconfig",
-			EnvVar: "PLUGIN_DOCKERCONFIG_OVERRIDE",
+			EnvVar: "PLUGIN_CONFIG",
 		},
 		cli.StringFlag{
 			Name:   "auto-tag-suffix",
@@ -176,6 +176,11 @@ func main() {
 			Usage:  "Set this flag if you only want to build the image, without pushing to a registry",
 			EnvVar: "PLUGIN_NO_PUSH",
 		},
+		cli.StringFlag{
+			Name:   "tar-path",
+			Usage:  "Set this flag to save the image as a tarball at path",
+			EnvVar: "PLUGIN_TAR_PATH",
+		},
 		cli.StringFlag{
 			Name:   "verbosity",
 			Usage:  "Set this flag with value as oneof <panic|fatal|error|warn|info|debug|trace> to set the logging level for kaniko. Defaults to info.",
@@ -191,6 +196,11 @@ func main() {
 			Usage:  "build only used stages",
 			EnvVar: "PLUGIN_SKIP_UNUSED_STAGES",
 		},
+		cli.StringFlag{
+			Name:   "output-file",
+			Usage:  "Output file location that will be generated by the plugin. This file will include information of the output that are exported by the plugin.",
+			EnvVar: "DRONE_OUTPUT",
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {
@@ -201,11 +211,11 @@ func main() {
 func run(c *cli.Context) error {
 	username := c.String("username")
 	noPush := c.Bool("no-push")
-	configOverride := c.String("dockerconfig-override")
+	configOverride := c.String("dockerconfig")
 
 	// if configOverride is provided, use this for docker auth
 	if len(configOverride) > 0 {
-		if err := writeDockerCfgFile([]byte(c.String("dockerconfig-override"))); err != nil {
+		if err := writeDockerCfgFile([]byte(configOverride)); err != nil {
 			return err
 		}
 	} else if !noPush || username != "" {
@@ -237,6 +247,7 @@ func run(c *cli.Context) error {
 			CacheTTL:         c.Int("cache-ttl"),
 			DigestFile:       defaultDigestFile,
 			NoPush:           noPush,
+			TarPath:          c.String("tar-path"),
 			Verbosity:        c.String("verbosity"),
 			Platform:         c.String("platform"),
 			SkipUnusedStages: c.Bool("skip-unused-stages"),
@@ -248,6 +259,9 @@ func run(c *cli.Context) error {
 			ArtifactFile: c.String("artifact-file"),
 			RegistryType: artifact.Docker,
 		},
+		Output: kaniko.Output{
+			OutputFile: c.String("output-file"),
+		},
 	}
 	return plugin.Exec()
 }

cmd/kaniko-ecr/main.go

@@ -64,6 +64,11 @@ func main() {
 			Value:  "Dockerfile",
 			EnvVar: "PLUGIN_DOCKERFILE",
 		},
+		cli.StringFlag{
+			Name:   "docker-registry",
+			Usage:  "docker registry",
+			EnvVar: "PLUGIN_DOCKER_REGISTRY,DOCKER_REGISTRY",
+		},
 		cli.StringFlag{
 			Name:   "docker-username",
 			Usage:  "docker username",
@@ -242,6 +247,7 @@ func run(c *cli.Context) error {
 	noPush := c.Bool("no-push")
 
 	dockerConfig, err := createDockerConfig(
+		c.String("docker-registry"),
 		c.String("docker-username"),
 		c.String("docker-password"),
 		c.String("access-key"),
@@ -328,12 +334,16 @@ func run(c *cli.Context) error {
 	return plugin.Exec()
 }
 
-func createDockerConfig(dockerUsername, dockerPassword, accessKey, secretKey,
+func createDockerConfig(dockerRegistry, dockerUsername, dockerPassword, accessKey, secretKey,
 	registry, assumeRole, externalId, region string, noPush bool) (*docker.Config, error) {
 	dockerConfig := docker.NewConfig()
 
 	if dockerUsername != "" {
-		dockerConfig.SetAuth(docker.RegistryV1, dockerUsername, dockerPassword)
+		// if no docker registry provided, use dockerhub by default
+		if len(dockerRegistry) == 0 {
+			dockerRegistry = docker.RegistryV1
+		}
+		dockerConfig.SetAuth(dockerRegistry, dockerUsername, dockerPassword)
 	}
 
 	if assumeRole != "" {
@@ -469,7 +479,7 @@ func getAssumeRoleCreds(region, roleArn, externalId, roleSessionName string) (st
 
 	username, password, registry, err := getAuthInfo(svc)
 	if err != nil {
-		return "", "", "", errors.Wrap(err, "failed to get ECR auth")
+		return "", "", "", errors.Wrap(err, "failed to get ECR auth: no basic auth credentials")
 	}
 	return username, password, registry, nil
 }

cmd/kaniko-ecr/main_test.go

@@ -10,6 +10,7 @@ import (
 
 func TestCreateDockerConfig(t *testing.T) {
 	got, err := createDockerConfig(
+		"",
 		"docker-username",
 		"docker-password",
 		"access-key",
@@ -34,10 +35,37 @@ func TestCreateDockerConfig(t *testing.T) {
 	}
 }
 
+func TestCreateDockerConfigFromGivenRegistry(t *testing.T) {
+	got, err := createDockerConfig(
+		"docker-registry",
+		"docker-username",
+		"docker-password",
+		"access-key",
+		"secret-key",
+		"ecr-registry",
+		"",
+		"",
+		"",
+		false,
+	)
+	if err != nil {
+		t.Error("failed to create docker config")
+	}
+
+	want := docker.NewConfig()
+	want.SetAuth("docker-registry", "docker-username", "docker-password")
+	want.SetCredHelper(docker.RegistryECRPublic, "ecr-login")
+	want.SetCredHelper("ecr-registry", "ecr-login")
+	if !reflect.DeepEqual(want, got) {
+		t.Errorf("not equal:\n  want: %#v\n   got: %#v", want, got)
+	}
+}
+
 func TestCreateDockerConfigKanikoOneDotEight(t *testing.T) {
 	os.Setenv(kanikoVersionEnv, "1.8.1")
 	defer os.Setenv(kanikoVersionEnv, "")
 	got, err := createDockerConfig(
+		"",
 		"docker-username",
 		"docker-password",
 		"access-key",

docker/acr/Dockerfile.linux.amd64

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-acr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-acr"]

docker/acr/Dockerfile.linux.arm64

@@ -1,8 +1,8 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
 ENV HOME /root
 ENV USER root
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/arm64/kaniko-acr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-acr"]

docker/docker/Dockerfile.linux.amd64

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.6.0
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.6.0
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-docker /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-docker"]

docker/docker/Dockerfile.linux.amd64.kaniko1.9.1

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-docker /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-docker"]

docker/docker/Dockerfile.linux.arm64

@@ -1,8 +1,8 @@
-FROM gcr.io/kaniko-project/executor:v1.6.0
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
 ENV HOME /root
 ENV USER root
 
-ENV KANIKO_VERSION=1.6.0
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/arm64/kaniko-docker /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-docker"]

docker/docker/Dockerfile.linux.arm64.kaniko1.9.1

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/arm64/kaniko-docker /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-docker"]

docker/docker/manifest-kaniko1.9.1.tmpl

@@ -1,4 +1,4 @@
-image: plugins/kaniko:{{#if build.tag}}{{trimPrefix "v" build.tag}}-kaniko1.8.1{{else}}latest-kaniko1.8.1{{/if}}
+image: plugins/kaniko:{{#if build.tag}}{{trimPrefix "v" build.tag}}-kaniko1.9.1{{else}}latest-kaniko1.9.1{{/if}}
 {{#if build.tags}}
 tags:
 {{#each build.tags}}
@@ -7,12 +7,12 @@ tags:
 {{/if}}
 manifests:
   -
-    image: plugins/kaniko:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64-kaniko1.8.1
+    image: plugins/kaniko:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64-kaniko1.9.1
     platform:
       architecture: amd64
       os: linux
   -
-    image: plugins/kaniko:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64-kaniko1.8.1
+    image: plugins/kaniko:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64-kaniko1.9.1
     platform:
       architecture: arm64
       os: linux

docker/ecr/Dockerfile.linux.amd64

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.6.0
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.6.0
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-ecr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-ecr"]

docker/ecr/Dockerfile.linux.amd64.kaniko1.9.1

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-ecr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-ecr"]

docker/ecr/Dockerfile.linux.arm64

@@ -1,8 +1,8 @@
-FROM gcr.io/kaniko-project/executor:v1.6.0
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
 ENV HOME /root
 ENV USER root
-ENV KANIKO_VERSION=1.6.0
+ENV KANIKO_VERSION=1.9.1
 
 ADD release/linux/arm64/kaniko-ecr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-ecr"]

docker/ecr/Dockerfile.linux.arm64.kaniko1.9.1

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/arm64/kaniko-ecr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-ecr"]

docker/ecr/manifest-kaniko1.9.1.tmpl

@@ -1,4 +1,4 @@
-image: plugins/kaniko-ecr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-kaniko1.8.1{{else}}latest-kaniko1.8.1{{/if}}
+image: plugins/kaniko-ecr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-kaniko1.9.1{{else}}latest-kaniko1.9.1{{/if}}
 {{#if build.tags}}
 tags:
 {{#each build.tags}}
@@ -7,12 +7,12 @@ tags:
 {{/if}}
 manifests:
   -
-    image: plugins/kaniko-ecr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64-kaniko1.8.1
+    image: plugins/kaniko-ecr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64-kaniko1.9.1
     platform:
       architecture: amd64
       os: linux
   -
-    image: plugins/kaniko-ecr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64-kaniko1.8.1
+    image: plugins/kaniko-ecr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64-kaniko1.9.1
     platform:
       architecture: arm64
       os: linux

docker/gcr/Dockerfile.linux.amd64

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.6.0
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.6.0
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-gcr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-gcr"]

docker/gcr/Dockerfile.linux.amd64.kaniko1.9.1

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/amd64/kaniko-gcr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-gcr"]

docker/gcr/Dockerfile.linux.arm64

@@ -1,8 +1,8 @@
-FROM gcr.io/kaniko-project/executor:v1.6.0
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
 ENV HOME /root
 ENV USER root
-ENV KANIKO_VERSION=1.6.0
+ENV KANIKO_VERSION=1.9.1
 
 ADD release/linux/arm64/kaniko-gcr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-gcr"]

docker/gcr/Dockerfile.linux.arm64.kaniko1.9.1

@@ -1,5 +1,5 @@
-FROM gcr.io/kaniko-project/executor:v1.8.1
+FROM gcr.io/kaniko-project/executor:v1.9.1
 
-ENV KANIKO_VERSION=1.8.1
+ENV KANIKO_VERSION=1.9.1
 ADD release/linux/arm64/kaniko-gcr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-gcr"]

docker/gcr/manifest-kaniko1.9.1.tmpl

@@ -1,4 +1,4 @@
-image: plugins/kaniko-gcr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-kaniko1.8.1{{else}}latest-kaniko1.8.1{{/if}}
+image: plugins/kaniko-gcr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-kaniko1.9.1{{else}}latest-kaniko1.9.1{{/if}}
 {{#if build.tags}}
 tags:
 {{#each build.tags}}
@@ -7,12 +7,12 @@ tags:
 {{/if}}
 manifests:
   -
-    image: plugins/kaniko-gcr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64-kaniko1.8.1
+    image: plugins/kaniko-gcr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64-kaniko1.9.1
     platform:
       architecture: amd64
       os: linux
   -
-    image: plugins/kaniko-gcr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64-kaniko1.8.1
+    image: plugins/kaniko-gcr:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64-kaniko1.9.1
     platform:
       architecture: arm64
       os: linux

kaniko.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"github.com/drone/drone-kaniko/pkg/artifact"
+	"github.com/drone/drone-kaniko/pkg/output"
 	"github.com/drone/drone-kaniko/pkg/tagger"
 	"golang.org/x/mod/semver"
 )
@@ -38,6 +39,7 @@ type (
 		Verbosity        string   // Log level
 		Platform         string   // Allows to build with another default platform than the host, similarly to docker build --platform
 		SkipUnusedStages bool     // Build only used stages
+		TarPath          string   // Set this flag to save the image as a tarball at path
 	}
 
 	// Artifact defines content of artifact file
@@ -49,10 +51,16 @@ type (
 		ArtifactFile string                    // Artifact file location
 	}
 
+	// Output defines content of output file
+	Output struct {
+		OutputFile string // File where plugin output are saved
+	}
+
 	// Plugin defines the Docker plugin parameters.
 	Plugin struct {
 		Build    Build    // Docker build configuration
 		Artifact Artifact // Artifact file content
+		Output   Output   // Output file content
 	}
 )
 
@@ -148,14 +156,15 @@ func (p Plugin) Exec() error {
 		fmt.Sprintf("--context=dir://%s", p.Build.Context),
 	}
 
-	// Set the destination repository
+	// Set the destination repository only when we push or save to tarball
-	if !p.Build.NoPush {
+	if !p.Build.NoPush || p.Build.TarPath != "" {
 		for _, tag := range tags {
 			for _, label := range p.Build.labelsForTag(tag) {
 				cmdArgs = append(cmdArgs, fmt.Sprintf("--destination=%s:%s", p.Build.Repo, label))
 			}
 		}
 	}
+
 	// Set the build arguments
 	for _, arg := range p.Build.Args {
 		cmdArgs = append(cmdArgs, fmt.Sprintf("--build-arg=%s", arg))
@@ -212,6 +221,10 @@ func (p Plugin) Exec() error {
 		cmdArgs = append(cmdArgs, "--skip-unused-stages")
 	}
 
+	if p.Build.TarPath != "" {
+		cmdArgs = append(cmdArgs, fmt.Sprintf("--tar-path=%s", p.Build.TarPath))
+	}
+	
 	cmd := exec.Command("/kaniko/executor", cmdArgs...)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
@@ -223,19 +236,29 @@ func (p Plugin) Exec() error {
 	}
 
 	if p.Build.DigestFile != "" && p.Artifact.ArtifactFile != "" {
-		content, err := ioutil.ReadFile(p.Build.DigestFile)
+		err = artifact.WritePluginArtifactFile(p.Artifact.RegistryType, p.Artifact.ArtifactFile, p.Artifact.Registry, p.Artifact.Repo, getDigest(p.Build.DigestFile), p.Artifact.Tags)
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "failed to read digest file contents at path: %s with error: %s\n", p.Build.DigestFile, err)
-		}
-		err = artifact.WritePluginArtifactFile(p.Artifact.RegistryType, p.Artifact.ArtifactFile, p.Artifact.Registry, p.Artifact.Repo, string(content), p.Artifact.Tags)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "failed to write plugin artifact file at path: %s with error: %s\n", p.Artifact.ArtifactFile, err)
 		}
 	}
 
+	if p.Output.OutputFile != "" {
+		if err = output.WritePluginOutputFile(p.Output.OutputFile, getDigest(p.Build.DigestFile)); err != nil {
+			fmt.Fprintf(os.Stderr, "failed to write plugin output file at path: %s with error: %s\n", p.Output.OutputFile, err)
+		}
+	}
+
 	return nil
 }
 
+func getDigest(digestFile string) string {
+	content, err := ioutil.ReadFile(digestFile)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to read digest file contents at path: %s with error: %s\n", digestFile, err)
+	}
+	return string(content)
+}
+
 // trace writes each command to stdout with the command wrapped in an xml
 // tag so that it can be extracted and displayed in the logs.
 func trace(cmd *exec.Cmd) {

pkg/output/output.go

@@ -0,0 +1,12 @@
+package output
+
+import (
+	"github.com/joho/godotenv"
+)
+
+func WritePluginOutputFile(outputFilePath, digest string) error {
+	output := map[string]string{
+		"digest": digest,
+	}
+	return godotenv.Write(output, outputFilePath)
+}