Add ARN attribute for aws_instance and data.aws_instance (#5425)

aws/data_source_aws_instance.go

@@ -5,6 +5,7 @@ import (
 	"log"
 
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/arn"
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/hashicorp/terraform/helper/schema"
 )
@@ -26,6 +27,10 @@ func dataSourceAwsInstance() *schema.Resource {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
+			"arn": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
 			"instance_type": {
 				Type:     schema.TypeString,
 				Computed: true,
@@ -317,6 +322,16 @@ func dataSourceAwsInstanceRead(d *schema.ResourceData, meta interface{}) error {
 		d.Set("password_data", passwordData)
 	}
 
+	// ARN
+	arn := arn.ARN{
+		Partition: meta.(*AWSClient).partition,
+		Region:    meta.(*AWSClient).region,
+		Service:   "ec2",
+		AccountID: meta.(*AWSClient).accountid,
+		Resource:  fmt.Sprintf("instance/%s", d.Id()),
+	}
+	d.Set("arn", arn.String())
+
 	return nil
 }
 

aws/data_source_aws_instance_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"fmt"
+	"regexp"
 
 	"github.com/hashicorp/terraform/helper/acctest"
 	"github.com/hashicorp/terraform/helper/resource"
@@ -20,6 +21,7 @@ func TestAccAWSInstanceDataSource_basic(t *testing.T) {
 					resource.TestCheckResourceAttr("data.aws_instance.web-instance", "ami", "ami-4fccb37f"),
 					resource.TestCheckResourceAttr("data.aws_instance.web-instance", "tags.%", "1"),
 					resource.TestCheckResourceAttr("data.aws_instance.web-instance", "instance_type", "m1.small"),
+					resource.TestMatchResourceAttr("data.aws_instance.web-instance", "arn", regexp.MustCompile(`^arn:[^:]+:ec2:[^:]+:\d{12}:instance/i-.+`)),
 				),
 			},
 		},

aws/resource_aws_instance.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/arn"
 	"github.com/aws/aws-sdk-go/aws/awserr"
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/hashicorp/terraform/helper/hashcode"
@@ -45,6 +46,11 @@ func resourceAwsInstance() *schema.Resource {
 				ForceNew: true,
 			},
 
+			"arn": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
 			"associate_public_ip_address": {
 				Type:     schema.TypeBool,
 				ForceNew: true,
@@ -802,6 +808,17 @@ func resourceAwsInstanceRead(d *schema.ResourceData, meta interface{}) error {
 		d.Set("ephemeral_block_device", []interface{}{})
 	}
 
+	// ARN
+
+	arn := arn.ARN{
+		Partition: meta.(*AWSClient).partition,
+		Region:    meta.(*AWSClient).region,
+		Service:   "ec2",
+		AccountID: meta.(*AWSClient).accountid,
+		Resource:  fmt.Sprintf("instance/%s", d.Id()),
+	}
+	d.Set("arn", arn.String())
+
 	// Instance attributes
 	{
 		attr, err := conn.DescribeInstanceAttribute(&ec2.DescribeInstanceAttributeInput{

aws/resource_aws_instance_test.go

@@ -130,6 +130,10 @@ func TestAccAWSInstance_basic(t *testing.T) {
 						"3dc39dda39be1205215e776bad998da361a5955d"),
 					resource.TestCheckResourceAttr(
 						"aws_instance.foo", "ebs_block_device.#", "0"),
+					resource.TestMatchResourceAttr(
+						"aws_instance.foo",
+						"arn",
+						regexp.MustCompile(`^arn:[^:]+:ec2:[^:]+:\d{12}:instance/i-.+`)),
 				),
 			},
 

website/docs/d/instance.html.markdown

@@ -57,6 +57,7 @@ are exported:
 interpolation.
 
 * `ami` - The ID of the AMI used to launch the instance.
+* `arn` - The ARN of the instance.
 * `associate_public_ip_address` - Whether or not the Instance is associated with a public IP address or not (Boolean).
 * `availability_zone` - The availability zone of the Instance.
 * `ebs_block_device` - The EBS block device mappings of the Instance.

website/docs/r/instance.html.markdown

@@ -240,6 +240,7 @@ resource "aws_instance" "foo" {
 In addition to all arguments above, the following attributes are exported:
 
 * `id` - The instance ID.
+* `arn` - The ARN of the instance.
 * `availability_zone` - The availability zone of the instance.
 * `placement_group` - The placement group of the instance.
 * `key_name` - The key name of the instance