Remove error return from constructor.

api/plugins/execplugin/execplugin.go

@@ -44,15 +44,19 @@ type ExecPlugin struct {
 	h *resmap.PluginHelpers
 }
 
-func NewExecPlugin(p string) (*ExecPlugin, error) {
-	f, err := os.Stat(p)
+func NewExecPlugin(p string) *ExecPlugin {
+	return &ExecPlugin{path: p}
+}
+
+func (p *ExecPlugin) ErrIfNotExecutable() error {
+	f, err := os.Stat(p.path)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	if f.Mode()&0111 == 0000 {
-		return nil, fmt.Errorf("unable to execute plugin on path: %s", p)
+		return fmt.Errorf("unexecutable plugin at: %s", p.path)
 	}
-	return &ExecPlugin{path: p}, nil
+	return nil
 }
 
 func (p *ExecPlugin) Path() string {

api/plugins/execplugin/execplugin_test.go

@@ -5,7 +5,6 @@ package execplugin_test
 
 import (
 	"fmt"
-	"os"
 	"strings"
 	"testing"
 
@@ -44,13 +43,15 @@ s/$BAR/bar/g
  \ \ \ 
 `))
 
-	p, err := NewExecPlugin(
+	p := NewExecPlugin(
 		loader.AbsolutePluginPath(
-			pgmconfig.DefaultPluginConfig(),
+			pgmconfig.DisabledPluginConfig(),
 			pluginConfig.OrgId()))
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err.Error())
-	}
+	// Not checking to see if the plugin is executable,
+	// because this test does not run it.
+	// This tests only covers sending configuration
+	// to the plugin wrapper object and confirming
+	// that it's properly prepared for execution.
 
 	yaml, err := pluginConfig.AsYAML()
 	if err != nil {
@@ -58,7 +59,7 @@ s/$BAR/bar/g
 	}
 	p.Config(resmap.NewPluginHelpers(ldr, v, rf), yaml)
 
-	expected := "/kustomize/plugin/someteam.example.com/v1/sedtransformer/SedTransformer"
+	expected := "someteam.example.com/v1/sedtransformer/SedTransformer"
 	if !strings.HasSuffix(p.Path(), expected) {
 		t.Fatalf("expected suffix '%s', got '%s'", expected, p.Path())
 	}
@@ -118,9 +119,9 @@ func strptr(s string) *string {
 }
 
 func TestUpdateResourceOptions(t *testing.T) {
-	p, err := NewExecPlugin("")
-	if !os.IsNotExist(err) {
-		t.Fatalf("unexpected error: %v", err.Error())
+	p := NewExecPlugin("")
+	if err := p.ErrIfNotExecutable(); err == nil {
+		t.Fatalf("expected unexecutable error")
 	}
 	rf := resource.NewFactory(kunstruct.NewKunstructuredFactoryImpl())
 	in := resmap.New()
@@ -166,9 +167,9 @@ func TestUpdateResourceOptions(t *testing.T) {
 }
 
 func TestUpdateResourceOptionsWithInvalidHashAnnotationValues(t *testing.T) {
-	p, err := NewExecPlugin("")
-	if !os.IsNotExist(err) {
-		t.Fatalf("unexpected error: %v", err.Error())
+	p := NewExecPlugin("")
+	if err := p.ErrIfNotExecutable(); err == nil {
+		t.Fatalf("expected unexecutable error")
 	}
 	rf := resource.NewFactory(kunstruct.NewKunstructuredFactoryImpl())
 	cases := []string{