Add PrintPluginEnv plugin.

api/krusty/pluginenv_test.go

@@ -0,0 +1,80 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package krusty_test
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"sigs.k8s.io/kustomize/api/filesys"
+	"sigs.k8s.io/kustomize/api/konfig"
+	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+)
+
+// The PrintPluginEnv plugin is a toy plugin that emits
+// its working directory and some environment variables,
+// to add regression protection to plugin loading logic.
+func TestPluginEnvironment(t *testing.T) {
+	tc := kusttest_test.NewPluginTestEnv(t).Set()
+	defer tc.Reset()
+
+	tc.PrepExecPlugin(
+		"someteam.example.com", "v1", "PrintPluginEnv")
+
+	confirmBehavior(
+		makeTestHarnessWithFs(t, filesys.MakeFsInMemory()),
+		filesys.Separator)
+
+	dir := makeTmpDir(t)
+	defer os.RemoveAll(dir)
+	confirmBehavior(
+		makeTestHarnessWithFs(t, filesys.MakeFsOnDisk()),
+		dir)
+}
+
+func confirmBehavior(th testingHarness, dir string) {
+	th.WriteK(dir, `
+generators:
+- config.yaml
+`)
+	th.WriteF(filepath.Join(dir, "config.yaml"), `
+apiVersion: someteam.example.com/v1
+kind: PrintPluginEnv
+metadata:
+  name: irrelevantHere
+`)
+	m := th.Run(dir, th.MakeOptionsPluginsEnabled())
+
+	pHome, ok := os.LookupEnv(konfig.KustomizePluginHomeEnv)
+	if !ok {
+		th.GetT().Fatalf(
+			"expected env var '%s' to be defined",
+			konfig.KustomizePluginHomeEnv)
+	}
+
+	th.AssertActualEqualsExpected(m, `
+apiVersion: v1
+env:
+  kustomize_plugin_config_root: `+dir+`
+  kustomize_plugin_home: `+pHome+`
+  pwd: `+dir+`
+kind: GeneratedEnv
+metadata:
+  name: hello
+`)
+}
+
+func makeTmpDir(t *testing.T) string {
+	base, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("err %v", err)
+	}
+	dir, err := ioutil.TempDir(base, "kustomize-tmp-test-")
+	if err != nil {
+		t.Fatalf("err %v", err)
+	}
+	return dir
+}

api/krusty/testingharness_test.go

@@ -23,12 +23,21 @@ type testingHarness struct {
 }
 
 func makeTestHarness(t *testing.T) testingHarness {
+	return makeTestHarnessWithFs(t, filesys.MakeFsInMemory())
+}
+
+func makeTestHarnessWithFs(
+	t *testing.T, fSys filesys.FileSystem) testingHarness {
 	return testingHarness{
 		t:    t,
-		fSys: filesys.MakeFsInMemory(),
+		fSys: fSys,
 	}
 }
 
+func (th testingHarness) GetT() *testing.T {
+	return th.t
+}
+
 func (th testingHarness) WriteK(path string, content string) {
 	th.fSys.WriteFile(
 		filepath.Join(