provider/openstack: Catch error during instance network parsing

This commit catches an error when the instance is parsing and building
its network list. This can happen when a cloud provider responds with
a non-JSON response for the list of networks.

builtin/providers/openstack/resource_openstack_compute_instance_v2.go

@@ -1056,19 +1056,26 @@ func getInstanceNetworks(computeClient *gophercloud.ServiceClient, d *schema.Res
 					log.Printf("[DEBUG] os-tenant-networks disabled.")
 					tenantNetworkExt = false
 				} else {
-					return nil, err
+					log.Printf("[DEBUG] unexpected os-tenant-networks error: %s", err)
+					tenantNetworkExt = false
 				}
 			}
 		}
 
-		networkID := ""
-		networkName := ""
+		// In some cases, a call to os-tenant-networks might work,
+		// but the response is invalid. Catch this during extraction.
+		networkList := []tenantnetworks.Network{}
 		if tenantNetworkExt {
-			networkList, err := tenantnetworks.ExtractNetworks(allPages)
+			networkList, err = tenantnetworks.ExtractNetworks(allPages)
 			if err != nil {
-				return nil, err
+				log.Printf("[DEBUG] error extracting os-tenant-networks results: %s", err)
+				tenantNetworkExt = false
 			}
+		}
 
+		networkID := ""
+		networkName := ""
+		if tenantNetworkExt {
 			for _, network := range networkList {
 				if network.Name == rawMap["name"] {
 					tenantnet = network

builtin/providers/openstack/resource_openstack_compute_instance_v2_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/secgroups"
 	"github.com/gophercloud/gophercloud/openstack/compute/v2/extensions/volumeattach"
 	"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
+	"github.com/gophercloud/gophercloud/openstack/networking/v2/networks"
 	"github.com/gophercloud/gophercloud/pagination"
 )
 
@@ -666,6 +667,27 @@ func TestAccComputeV2Instance_timeout(t *testing.T) {
 	})
 }
 
+func TestAccComputeV2Instance_networkNameToID(t *testing.T) {
+	var instance servers.Server
+	var network networks.Network
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckComputeV2InstanceDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccComputeV2Instance_networkNameToID,
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckComputeV2InstanceExists("openstack_compute_instance_v2.instance_1", &instance),
+					testAccCheckNetworkingV2NetworkExists("openstack_networking_network_v2.network_1", &network),
+					resource.TestCheckResourceAttrPtr(
+						"openstack_compute_instance_v2.instance_1", "network.1.uuid", &network.ID),
+				),
+			},
+		},
+	})
+}
+
 func testAccCheckComputeV2InstanceDestroy(s *terraform.State) error {
 	config := testAccProvider.Meta().(*Config)
 	computeClient, err := config.computeV2Client(OS_REGION_NAME)
@@ -1580,3 +1602,34 @@ resource "openstack_compute_instance_v2" "instance_1" {
   }
 }
 `
+
+var testAccComputeV2Instance_networkNameToID = fmt.Sprintf(`
+resource "openstack_networking_network_v2" "network_1" {
+  name = "network_1"
+}
+
+resource "openstack_networking_subnet_v2" "subnet_1" {
+  name = "subnet_1"
+  network_id = "${openstack_networking_network_v2.network_1.id}"
+  cidr = "192.168.1.0/24"
+  ip_version = 4
+  enable_dhcp = true
+  no_gateway = true
+}
+
+resource "openstack_compute_instance_v2" "instance_1" {
+  depends_on = ["openstack_networking_subnet_v2.subnet_1"]
+
+  name = "instance_1"
+  security_groups = ["default"]
+
+  network {
+    uuid = "%s"
+  }
+
+  network {
+    name = "${openstack_networking_network_v2.network_1.name}"
+  }
+
+}
+`, OS_NETWORK_ID)