Add options for local user data

Now it's possible to use a local userdata folder. This is mostly useful
for development to avoid updating the user data Secrets all the time.

Author: sbueringer

pkg/cloud/openstack/options/options.go

@@ -22,9 +22,13 @@ import (
 )
 
 var (
-	TokenTTL time.Duration
+	TokenTTL              time.Duration
+	UserDataFolder        string
+	UserDataPostprocessor string
 )
 
 func init() {
 	flag.DurationVar(&TokenTTL, "token_ttl", 60*time.Minute, "TTL for kubeadm bootstrap token of the target Kubernetes cluster")
+	flag.StringVar(&UserDataFolder, "user-data-folder", "", "if set, user data files are retrieved from <user-data-folder>/<machine-name>.yaml")
+	flag.StringVar(&UserDataPostprocessor, "user-data-postprocessor", "", "postprocessor to user for the user data")
 }

pkg/cloud/openstack/services/userdata/machinescript.go

@@ -20,9 +20,11 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"io/ioutil"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/clientcmd"
 	"k8s.io/klog"
+	"path"
 	"sigs.k8s.io/cluster-api-provider-openstack/pkg/cloud/openstack/options"
 	"sigs.k8s.io/cluster-api-provider-openstack/pkg/deployer"
 	"sigs.k8s.io/cluster-api/pkg/util"
@@ -108,6 +110,15 @@ func GetUserData(controllerClient client.Client, kubeClient kubernetes.Interface
 		p, postprocess = userDataSecret.Data[PostprocessorKey]
 
 		postprocessor = string(p)
+	} else if options.UserDataFolder != "" {
+		userData, err = ioutil.ReadFile(path.Join(options.UserDataFolder, fmt.Sprintf("%s.yaml", machine.Name)))
+		if err != nil {
+			return "", fmt.Errorf("could not load local userdata files: %v", err)
+		}
+		postprocessor = options.UserDataPostprocessor
+		if postprocessor != "" {
+			postprocess = true
+		}
 	}
 
 	var userDataRendered string