Datasource for GCE service account (#1119)

* Data source for retrieving GCE service account
* Added project id for service account lookups (#15)
* Renaming attribute project_id -> project

google/data_source_google_compute_default_service_account.go

@@ -0,0 +1,40 @@
+package google
+
+import (
+	"github.com/hashicorp/terraform/helper/schema"
+)
+
+func dataSourceGoogleComputeDefaultServiceAccount() *schema.Resource {
+	return &schema.Resource{
+		Read: dataSourceGoogleComputeDefaultServiceAccountRead,
+		Schema: map[string]*schema.Schema{
+			"email": {
+				Type:     schema.TypeString,
+				Optional: true,
+			},
+			"project": {
+				Type:     schema.TypeString,
+				Optional: true,
+			},
+		},
+	}
+}
+
+func dataSourceGoogleComputeDefaultServiceAccountRead(d *schema.ResourceData, meta interface{}) error {
+	config := meta.(*Config)
+
+	project, err := getProject(d, config)
+	if err != nil {
+		return err
+	}
+
+	projectCompResource, err := config.clientCompute.Projects.Get(project).Do()
+	if err != nil {
+		return handleNotFoundError(err, d, "GCE service account not found")
+	}
+
+	d.SetId(projectCompResource.DefaultServiceAccount)
+	d.Set("email", projectCompResource.DefaultServiceAccount)
+	d.Set("project", project)
+	return nil
+}

google/data_source_google_compute_default_service_account_test.go

@@ -0,0 +1,31 @@
+package google
+
+import (
+	"testing"
+
+	"github.com/hashicorp/terraform/helper/resource"
+)
+
+func TestAccDataSourceGoogleComputeDefaultServiceAccount_basic(t *testing.T) {
+	t.Parallel()
+
+	resourceName := "data.google_compute_default_service_account.default"
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccCheckGoogleComputeDefaultServiceAccount_basic,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttrSet(resourceName, "id"),
+					resource.TestCheckResourceAttrSet(resourceName, "email"),
+				),
+			},
+		},
+	})
+}
+
+const testAccCheckGoogleComputeDefaultServiceAccount_basic = `
+data "google_compute_default_service_account" "default" { }
+`

google/provider.go

@@ -66,6 +66,7 @@ func Provider() terraform.ResourceProvider {
 			"google_client_config":                   dataSourceGoogleClientConfig(),
 			"google_cloudfunctions_function":         dataSourceGoogleCloudFunctionsFunction(),
 			"google_compute_address":                 dataSourceGoogleComputeAddress(),
+			"google_compute_default_service_account": dataSourceGoogleComputeDefaultServiceAccount(),
 			"google_compute_image":                   dataSourceGoogleComputeImage(),
 			"google_compute_global_address":          dataSourceGoogleComputeGlobalAddress(),
 			"google_compute_lb_ip_ranges":            dataSourceGoogleComputeLbIpRanges(),

website/docs/d/google_compute_default_service_account.html.markdown

@@ -0,0 +1,34 @@
+---
+layout: "google"
+page_title: "Google: google_compute_default_service_account"
+sidebar_current: "docs-google-datasource-compute-default-service-account"
+description: |-
+  Retrieve default service account used by VMs running in this project
+---
+
+# google\_compute\_default\_service\_account
+
+Use this data source to retrieve default service account for this project
+
+## Example Usage
+
+```hcl
+data "google_compute_default_service_account" "default" { }
+
+output "default_account" {
+  value = "${google_compute_default_service_account.default.email}"
+} 
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `project` - (Optional) The project ID. If it is not provided, the provider project is used.
+
+
+## Attributes Reference
+
+The following attributes are exported:
+
+* `email` - Email address of the default service account used by VMs running in this project

website/google.erb

@@ -25,6 +25,9 @@
       <li<%= sidebar_current("docs-google-datasource-compute-address") %>>
         <a href="/docs/providers/google/d/datasource_compute_address.html">google_compute_address</a>
       </li>
+      <li<%= sidebar_current("docs-google-datasource-compute-default-service-account") %>>
+        <a href="/docs/providers/google/d/google_compute_default_service_account.html">google_compute_default_service_account</a>
+      </li>
       <li<%= sidebar_current("docs-google-datasource-compute-image") %>>
         <a href="/docs/providers/google/d/datasource_compute_image.html">google_compute_image</a>
       </li>