Fix pipeline yaml with auto tag suffix

Log error if dockerfile does not exist at provided path

.drone.yml

@@ -14,30 +14,45 @@ steps:
   settings:
     repo: plugins/kaniko
     auto_tag: true
+    auto_tag_suffix: linux-amd64
     dockerfile: docker/docker/Dockerfile.linux.amd64
     username:
       from_secret: docker_username
     password:
       from_secret: docker_password
+  when:
+    event:
+    - push
+    - tag
 
 - name: gcr
   image: plugins/docker
   settings:
     repo: plugins/kaniko-gcr
     auto_tag: true
+    auto_tag_suffix: linux-amd64
     dockerfile: docker/gcr/Dockerfile.linux.amd64
     username:
       from_secret: docker_username
     password:
       from_secret: docker_password
+  when:
+    event:
+    - push
+    - tag
 
 - name: ecr
   image: plugins/docker
   settings:
     repo: plugins/kaniko-ecr
     auto_tag: true
+    auto_tag_suffix: linux-amd64
     dockerfile: docker/ecr/Dockerfile.linux.amd64
     username:
       from_secret: docker_username
     password:
       from_secret: docker_password
+  when:
+    event:
+    - push
+    - tag

cmd/kaniko-ecr/main.go

@@ -109,7 +109,7 @@ func run(c *cli.Context) error {
 			Tags:       c.StringSlice("tags"),
 			Args:       c.StringSlice("args"),
 			Target:     c.String("target"),
-			Repo:       c.String("repo"),
+			Repo:       fmt.Sprintf("%s/%s", c.String("registry"), c.String("repo")),
 			Labels:     c.StringSlice("custom-labels"),
 		},
 	}
@@ -117,28 +117,25 @@ func run(c *cli.Context) error {
 }
 
 func setupECRAuth(accessKey, secretKey, registry string) error {
-	if accessKey == "" {
-		return fmt.Errorf("Access key must be specified")
-	}
-	if secretKey == "" {
-		return fmt.Errorf("Secret key must be specified")
-	}
 	if registry == "" {
 		return fmt.Errorf("Registry must be specified")
 	}
 
-	err := os.Setenv(accessKeyEnv, accessKey)
-	if err != nil {
-		return errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", accessKeyEnv))
-	}
+	// If IAM role is used, access key & secret key are not required
+	if accessKey != "" && secretKey != "" {
+		err := os.Setenv(accessKeyEnv, accessKey)
+		if err != nil {
+			return errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", accessKeyEnv))
+		}
 
-	err = os.Setenv(secretKeyEnv, secretKey)
-	if err != nil {
-		return errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", secretKeyEnv))
+		err = os.Setenv(secretKeyEnv, secretKey)
+		if err != nil {
+			return errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", secretKeyEnv))
+		}
 	}
 
 	jsonBytes := []byte(fmt.Sprintf(`{"credStore": "ecr-login", "credHelpers": {"%s": "ecr-login"}}`, registry))
-	err = ioutil.WriteFile(dockerConfigPath, jsonBytes, 0644)
+	err := ioutil.WriteFile(dockerConfigPath, jsonBytes, 0644)
 	if err != nil {
 		return errors.Wrap(err, "failed to create docker config file")
 	}

cmd/kaniko-gcr/main.go

@@ -15,7 +15,7 @@ import (
 
 const (
 	// GCR JSON key file path
-	gcrKeyPath     string = "/kaniko/gcr.json"
+	gcrKeyPath     string = "/kaniko/config.json"
 	gcrEnvVariable string = "GOOGLE_APPLICATION_CREDENTIALS"
 )
 

docker/docker/Dockerfile.linux.amd64

@@ -1,7 +1,4 @@
-FROM gcr.io/kaniko-project/executor:amd64-v1.3.0
-
-ENV HOME /root
-ENV USER root
+FROM gcr.io/kaniko-project/executor:v1.3.0
 
 ADD release/linux/amd64/kaniko-docker /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-docker"]

docker/ecr/Dockerfile.linux.amd64

@@ -1,7 +1,4 @@
-FROM gcr.io/kaniko-project/executor:amd64-v1.3.0
-
-ENV HOME /root
-ENV USER root
+FROM gcr.io/kaniko-project/executor:v1.3.0
 
 ADD release/linux/amd64/kaniko-ecr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-ecr"]

docker/gcr/Dockerfile.linux.amd64

@@ -1,7 +1,4 @@
-FROM gcr.io/kaniko-project/executor:amd64-v1.3.0
-
-ENV HOME /root
-ENV USER root
+FROM gcr.io/kaniko-project/executor:v1.3.0
 
 ADD release/linux/amd64/kaniko-gcr /kaniko/
 ENTRYPOINT ["/kaniko/kaniko-gcr"]

kaniko.go

@@ -31,6 +31,10 @@ func (p Plugin) Exec() error {
 		return fmt.Errorf("repository name to publish image must be specified")
 	}
 
+	if _, err := os.Stat(p.Build.Dockerfile); os.IsNotExist(err) {
+		return fmt.Errorf("dockerfile does not exist at path: %s", p.Build.Dockerfile)
+	}
+
 	cmdArgs := []string{
 		fmt.Sprintf("--dockerfile=%s", p.Build.Dockerfile),
 		fmt.Sprintf("--context=dir://%s", p.Build.Context),
@@ -46,7 +50,7 @@ func (p Plugin) Exec() error {
 	}
 	// Set the labels
 	for _, label := range p.Build.Labels {
-		cmdArgs = append(cmdArgs, fmt.Sprintf("--label %s", label))
+		cmdArgs = append(cmdArgs, fmt.Sprintf("--label=%s", label))
 	}
 
 	if p.Build.Target != "" {