Don't fail if docEntryPoint isn't defined for Container exec

Input for this executor could be empty, so we have to handle
ErrDocumentEntrypointNotDefined error more intelligently.

Change-Id: I73e0f770e64cead7dbbbce2af2b7a2ebd323b83b
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>
Relates-To: #485
Closes: #485

manifests/phases/phases.yaml

@@ -278,4 +278,3 @@ config:
     apiVersion: airshipit.org/v1alpha1
     kind: GenericContainer
     name: iso-build-image
-  documentEntryPoint: empty

pkg/phase/executors/container.go

@@ -16,6 +16,7 @@ package executors
 
 import (
 	"bytes"
+	goerrors "errors"
 	"io"
 	"os"
 	"path/filepath"
@@ -27,6 +28,7 @@ import (
 	"opendev.org/airship/airshipctl/pkg/events"
 	"opendev.org/airship/airshipctl/pkg/k8s/kubeconfig"
 	"opendev.org/airship/airshipctl/pkg/log"
+	"opendev.org/airship/airshipctl/pkg/phase/errors"
 	"opendev.org/airship/airshipctl/pkg/phase/ifc"
 )
 
@@ -46,9 +48,12 @@ type ContainerExecutor struct {
 
 // NewContainerExecutor creates instance of phase executor
 func NewContainerExecutor(cfg ifc.ExecutorConfig) (ifc.Executor, error) {
-	// TODO add logic that checks if the path was not defined, and if so, we are fine
-	// and bundle should be either nil or empty, consider ContinueOnEmptyInput option to container client
 	bundle, err := cfg.BundleFactory()
+	// ErrDocumentEntrypointNotDefined error should not cause Container executor to fail, so filter it
+	if err != nil && goerrors.As(err, &errors.ErrDocumentEntrypointNotDefined{}) {
+		// if docEntryPoint isn't defined initialize empty bundle instead to safely use it without nil checks
+		bundle, err = document.NewBundleFromBytes([]byte{})
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -95,7 +100,6 @@ func (c *ContainerExecutor) Run(evtCh chan events.Event, opts ifc.RunOptions) {
 
 	input, err := bundleReader(c.ExecutorBundle)
 	if err != nil {
-		// TODO move bundleFactory here, and make sure that if executorDoc is not defined, we dont fail
 		handleError(evtCh, err)
 		return
 	}

pkg/phase/executors/container_test.go

@@ -26,6 +26,7 @@ import (
 	"opendev.org/airship/airshipctl/pkg/document"
 	"opendev.org/airship/airshipctl/pkg/events"
 	"opendev.org/airship/airshipctl/pkg/k8s/kubeconfig"
+	"opendev.org/airship/airshipctl/pkg/phase/errors"
 	"opendev.org/airship/airshipctl/pkg/phase/executors"
 	"opendev.org/airship/airshipctl/pkg/phase/ifc"
 )
@@ -84,6 +85,18 @@ func TestNewContainerExecutor(t *testing.T) {
 		assert.Error(t, err)
 		assert.Nil(t, e)
 	})
+
+	t.Run("bundle factory - empty documentEntryPoint", func(t *testing.T) {
+		e, err := executors.NewContainerExecutor(ifc.ExecutorConfig{
+			ExecutorDocument: execDoc,
+			BundleFactory: func() (document.Bundle, error) {
+				return nil, errors.ErrDocumentEntrypointNotDefined{}
+			},
+			Helper: makeDefaultHelper(t, "../../container/testdata", "metadata.yaml"),
+		})
+		assert.NoError(t, err)
+		assert.NotNil(t, e)
+	})
 }
 
 func TestGenericContainer(t *testing.T) {