add secret and configmap generator plugins

k8sdeps/kv/plugin/goplugin.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package plugin
+
+import (
+	"fmt"
+	"os"
+	"plugin"
+)
+
+var _ Factory = &goFactory{}
+
+const (
+	dir = "$HOME/.config/kustomize/plugins/kvsource"
+)
+
+func newGoFactory() *goFactory {
+	return &goFactory{
+		plugins: make(map[string]KVSource),
+	}
+}
+
+type goFactory struct {
+	plugins map[string]KVSource
+}
+
+func (p *goFactory) load(name string) (KVSource, error) {
+	if plug, ok := p.plugins[name]; ok {
+		return plug, nil
+	}
+
+	goPlugin, err := plugin.Open(fmt.Sprintf("%s/kustomize-%s.so", os.ExpandEnv(dir), name))
+	if err != nil {
+		return nil, err
+	}
+
+	symbol, err := goPlugin.Lookup("Plugin")
+	if err != nil {
+		return nil, err
+	}
+
+	plug, ok := symbol.(KVSource)
+	if !ok {
+		return nil, fmt.Errorf("plugin %s not found", name)
+	}
+
+	p.plugins[name] = plug
+	return plug, nil
+}