Cloud provider should return an error

Not fatal - makes cloud provider useful in methods that
can return error.

pkg/cloudprovider/plugins.go

@@ -17,6 +17,7 @@ limitations under the License.
 package cloudprovider
 
 import (
+	"fmt"
 	"io"
 	"os"
 	"sync"
@@ -62,12 +63,12 @@ func GetCloudProvider(name string, config io.Reader) (Interface, error) {
 }
 
 // InitCloudProvider creates an instance of the named cloud provider.
-func InitCloudProvider(name string, configFilePath string) Interface {
+func InitCloudProvider(name string, configFilePath string) (Interface, error) {
 	var cloud Interface
 
 	if name == "" {
 		glog.Info("No cloud provider specified.")
-		return nil
+		return nil, nil
 	}
 
 	var err error
@@ -87,11 +88,11 @@ func InitCloudProvider(name string, configFilePath string) Interface {
 	}
 
 	if err != nil {
-		glog.Fatalf("Couldn't init cloud provider %q: %v", name, err)
+		return nil, fmt.Errorf("could not init cloud provider %q: %v", name, err)
 	}
 	if cloud == nil {
-		glog.Fatalf("Unknown cloud provider: %s", name)
+		return nil, fmt.Errorf("unknown cloud provider %q", name)
 	}
 
-	return cloud
+	return cloud, nil
 }