Read more default envvars for GCP

- Closes hashicorp#5874
- Fixes hashicorp#5872

builtin/providers/google/provider.go

@@ -27,20 +27,29 @@ func Provider() terraform.ResourceProvider {
 				DefaultFunc: schema.MultiEnvDefaultFunc([]string{
 					"GOOGLE_CREDENTIALS",
 					"GOOGLE_CLOUD_KEYFILE_JSON",
+					"GCLOUD_KEYFILE_JSON",
 				}, nil),
 				ValidateFunc: validateCredentials,
 			},
 
 			"project": &schema.Schema{
-				Type:        schema.TypeString,
-				Optional:    true,
-				DefaultFunc: schema.EnvDefaultFunc("GOOGLE_PROJECT", ""),
+				Type:     schema.TypeString,
+				Optional: true,
+				DefaultFunc: schema.MultiEnvDefaultFunc([]string{
+					"GOOGLE_PROJECT",
+					"GCLOUD_PROJECT",
+					"CLOUDSDK_CORE_PROJECT",
+				}, nil),
 			},
 
 			"region": &schema.Schema{
-				Type:        schema.TypeString,
-				Required:    true,
-				DefaultFunc: schema.EnvDefaultFunc("GOOGLE_REGION", nil),
+				Type:     schema.TypeString,
+				Required: true,
+				DefaultFunc: schema.MultiEnvDefaultFunc([]string{
+					"GOOGLE_REGION",
+					"GCLOUD_REGION",
+					"CLOUDSDK_COMPUTE_REGION",
+				}, nil),
 			},
 		},
 

builtin/providers/google/provider_test.go

@@ -3,6 +3,7 @@ package google
 import (
 	"io/ioutil"
 	"os"
+	"strings"
 	"testing"
 
 	"github.com/hashicorp/terraform/helper/schema"
@@ -38,18 +39,40 @@ func testAccPreCheck(t *testing.T) {
 		os.Setenv("GOOGLE_CREDENTIALS", string(creds))
 	}
 
-	if v := os.Getenv("GOOGLE_CREDENTIALS"); v == "" {
-		if w := os.Getenv("GOOGLE_CLOUD_KEYFILE_JSON"); w == "" {
-			t.Fatal("GOOGLE_CREDENTIALS or GOOGLE_CLOUD_KEYFILE_JSON must be set for acceptance tests")
+	multiEnvSearch := func(ks []string) string {
+		for _, k := range ks {
+			if v := os.Getenv(k); v != "" {
+				return v
+			}
 		}
+		return ""
 	}
 
-	if v := os.Getenv("GOOGLE_PROJECT"); v == "" {
-		t.Fatal("GOOGLE_PROJECT must be set for acceptance tests")
+	creds := []string{
+		"GOOGLE_CREDENTIALS",
+		"GOOGLE_CLOUD_KEYFILE_JSON",
+		"GCLOUD_KEYFILE_JSON",
+	}
+	if v := multiEnvSearch(creds); v == "" {
+		t.Fatalf("One of %s must be set for acceptance tests", strings.Join(creds, ", "))
 	}
 
-	if v := os.Getenv("GOOGLE_REGION"); v != "us-central1" {
-		t.Fatal("GOOGLE_REGION must be set to us-central1 for acceptance tests")
+	projs := []string{
+		"GOOGLE_PROJECT",
+		"GCLOUD_PROJECT",
+		"CLOUDSDK_CORE_PROJECT",
+	}
+	if v := multiEnvSearch(projs); v == "" {
+		t.Fatalf("One of %s must be set for acceptance tests", strings.Join(creds, ", "))
+	}
+
+	regs := []string{
+		"GOOGLE_REGION",
+		"GCLOUD_REGION",
+		"CLOUDSDK_COMPUTE_REGION",
+	}
+	if v := multiEnvSearch(regs); v != "us-central-1" {
+		t.Fatalf("One of %s must be set to us-central-1 for acceptance tests", strings.Join(creds, ", "))
 	}
 }
 

website/source/docs/providers/google/index.html.markdown

@@ -39,17 +39,28 @@ The following keys can be used to configure the provider.
   retrieving this file are below. Credentials may be blank if you are running
   Terraform from a GCE instance with a properly-configured [Compute Engine
   Service Account](https://cloud.google.com/compute/docs/authentication). This
-  can also be specified with the `GOOGLE_CREDENTIALS` or `GOOGLE_CLOUD_KEYFILE_JSON`
-  shell environment variable, containing the contents of the credentials file.
+  can also be specified using any of the following environment variables
+  (listed in order of precedence):
+
+    * `GOOGLE_CREDENTIALS`
+    * `GOOGLE_CLOUD_KEYFILE_JSON`
+    * `GCLOUD_KEYFILE_JSON`
+
+* `project` - (Required) The ID of the project to apply any resources to.  This
+  can be specified using any of the following environment variables (listed in
+  order of precedence):
+
+    * `GOOGLE_PROJECT`
+    * `GCLOUD_PROJECT`
+    * `CLOUDSDK_CORE_PROJECT`
 
 * `region` - (Required) The region to operate under. This can also be specified
-  with the `GOOGLE_REGION` shell environment variable.
+  using any of the following environment variables (listed in order of
+  precedence):
 
-* `project` - (Optional) The ID of the project to apply resources in. This
-  can also be specified with the `GOOGLE_PROJECT` shell environment variable.
-  If unspecified, users will need to specify the `project` attribute for
-  all resources. If specified, resources which do not depend on a project will
-  ignore this value.
+    * `GOOGLE_REGION`
+    * `GCLOUD_REGION`
+    * `CLOUDSDK_COMPUTE_REGION`
 
 The following keys are supported for backwards compatibility, and may be
 removed in a future version: