Cut more ties to k8sdeps

Add tests for all the plugins.

plugin/someteam.example.com/v1/secretsfromdatabase/SecretsFromDatabase.go

@@ -0,0 +1,54 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"sigs.k8s.io/kustomize/pkg/ifc"
+	"sigs.k8s.io/kustomize/pkg/resmap"
+	"sigs.k8s.io/kustomize/pkg/types"
+	"sigs.k8s.io/yaml"
+)
+
+// A secret generator example that gets data
+// from a database (simulated by a hardcoded map).
+type plugin struct {
+	rf        *resmap.Factory
+	ldr       ifc.Loader
+	Name      string `json:"name,omitempty" yaml:"name,omitempty"`
+	Namespace string `json:"namespace,omitempty" yaml:"namespace,omitempty"`
+	// List of keys to use in database lookups
+	Keys []string `json:"keys,omitempty" yaml:"keys,omitempty"`
+}
+
+var KustomizePlugin plugin
+
+var database = map[string]string{
+	"TREE":      "oak",
+	"ROCKET":    "SaturnV",
+	"FRUIT":     "apple",
+	"VEGETABLE": "carrot",
+	"SIMPSON":   "homer",
+}
+
+func (p *plugin) Config(
+	ldr ifc.Loader, rf *resmap.Factory, c []byte) error {
+	p.rf = rf
+	return yaml.Unmarshal(c, p)
+}
+
+// The plan here is to convert the plugin's input
+// into the format used by the builtin secret generator plugin.
+func (p *plugin) Generate() (resmap.ResMap, error) {
+	args := types.SecretArgs{}
+	args.Name = p.Name
+	args.Namespace = p.Namespace
+	for _, k := range p.Keys {
+		if v, ok := database[k]; ok {
+			args.LiteralSources = append(
+				args.LiteralSources, k+"="+v)
+		}
+	}
+	return p.rf.FromSecretArgs(p.ldr, nil, args)
+
+}