Add arn for aws_subnet and data.aws_subnet

aws/data_source_aws_subnet.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"
 )
@@ -74,6 +75,11 @@ func dataSourceAwsSubnet() *schema.Resource {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
+
+			"arn": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
 		},
 	}
 }
@@ -155,5 +161,14 @@ func dataSourceAwsSubnetRead(d *schema.ResourceData, meta interface{}) error {
 		}
 	}
 
+	arn := arn.ARN{
+		Partition: meta.(*AWSClient).partition,
+		Region:    meta.(*AWSClient).region,
+		Service:   "ec2",
+		AccountID: meta.(*AWSClient).accountid,
+		Resource:  fmt.Sprintf("subnet/%s", d.Id()),
+	}
+	d.Set("arn", arn.String())
+
 	return nil
 }

aws/data_source_aws_subnet_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/hashicorp/terraform/helper/acctest"
 	"github.com/hashicorp/terraform/helper/resource"
 	"github.com/hashicorp/terraform/terraform"
+	"regexp"
 )
 
 func TestAccDataSourceAwsSubnet_basic(t *testing.T) {
@@ -117,6 +118,13 @@ func testAccDataSourceAwsSubnetCheck(name string, rInt int) resource.TestCheckFu
 			return fmt.Errorf("bad Name tag %s", attr["tags.Name"])
 		}
 
+		arnformat := `^arn:[^:]+:ec2:[^:]+:\d{12}:subnet/subnet-.+`
+		arnregex := regexp.MustCompile(arnformat)
+
+		if !arnregex.MatchString(attr["arn"]) {
+			return fmt.Errorf("arn doesn't match format %s", attr["arn"])
+		}
+
 		return nil
 	}
 }

aws/resource_aws_subnet.go

@@ -6,6 +6,7 @@ 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/resource"
@@ -68,6 +69,11 @@ func resourceAwsSubnet() *schema.Resource {
 				Computed: true,
 			},
 
+			"arn": {
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
 			"tags": tagsSchema(),
 		},
 	}
@@ -154,6 +160,16 @@ func resourceAwsSubnetRead(d *schema.ResourceData, meta interface{}) error {
 			d.Set("ipv6_cidr_block", "")
 		}
 	}
+
+	arn := arn.ARN{
+		Partition: meta.(*AWSClient).partition,
+		Region:    meta.(*AWSClient).region,
+		Service:   "ec2",
+		AccountID: meta.(*AWSClient).accountid,
+		Resource:  fmt.Sprintf("subnet/%s", d.Id()),
+	}
+	d.Set("arn", arn.String())
+
 	d.Set("tags", tagsToMap(subnet.Tags))
 
 	return nil

aws/resource_aws_subnet_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/aws/aws-sdk-go/service/ec2"
 	"github.com/hashicorp/terraform/helper/resource"
 	"github.com/hashicorp/terraform/terraform"
+	"regexp"
 )
 
 // add sweeper to delete known test subnets
@@ -111,6 +112,10 @@ func TestAccAWSSubnet_basic(t *testing.T) {
 					testAccCheckSubnetExists(
 						"aws_subnet.foo", &v),
 					testCheck,
+					resource.TestMatchResourceAttr(
+						"aws_subnet.foo",
+						"arn",
+						regexp.MustCompile(`^arn:[^:]+:ec2:[^:]+:\d{12}:subnet/subnet-.+`)),
 				),
 			},
 		},

website/docs/d/subnet.html.markdown

@@ -89,3 +89,7 @@ All of the argument attributes except `filter` blocks are also exported as
 result attributes. This data source will complete the data by populating
 any fields that are not included in the configuration with the data for
 the selected subnet.
+
+In addition the following attributes are exported:
+
+* `arn` - The ARN of the subnet.

website/docs/r/subnet.html.markdown

@@ -64,6 +64,7 @@ The following arguments are supported:
 In addition to all arguments above, the following attributes are exported:
 
 * `id` - The ID of the subnet
+* `arn` - The ARN of the subnet.
 * `availability_zone`- The AZ for the subnet.
 * `cidr_block` - The CIDR block for the subnet.
 * `vpc_id` - The VPC ID.