Simplify some of the plugin testing code.

pkg/plugins/compiler.go

@@ -20,9 +20,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
-	"path"
 	"path/filepath"
-	"runtime"
 	"time"
 
 	"sigs.k8s.io/kustomize/k8sdeps/kv/plugin"
@@ -51,15 +49,7 @@ func DefaultSrcRoot() (string, error) {
 		os.Getenv("GOPATH"), "src",
 		pgmconfig.DomainName,
 		pgmconfig.ProgramName, pgmconfig.PluginRoot)
-	if FileExists(root) {
-		return root, nil
-	}
-	nope = append(nope, root)
 
-	// get the root kustomize source directory when
-	// GOPATH is not set
-	_, filename, _, _ := runtime.Caller(1)
-	root = path.Join(path.Dir(filename), "../..", pgmconfig.PluginRoot)
 	if FileExists(root) {
 		return root, nil
 	}
@@ -93,6 +83,11 @@ func (b *Compiler) ObjRoot() string {
 	return b.objRoot
 }
 
+// SrcRoot is where to find src.
+func (b *Compiler) SrcRoot() string {
+	return b.srcRoot
+}
+
 func goBin() string {
 	return filepath.Join(os.Getenv("GOROOT"), "bin", "go")
 }