Migrate to cobra CLI

We intend to migrate to the cobra cli from urfave/cli because the
project is more well maintained.  There are also some technical reasons
as well which extend into our remote client work.

Signed-off-by: baude <bbaude@redhat.com>

vendor/github.com/containers/buildah/imagebuildah/build.go

@@ -1311,13 +1311,17 @@ func (b *Executor) Build(ctx context.Context, stages imagebuilder.Stages) (strin
 
 	// Check if we have a one line Dockerfile making layers irrelevant
 	// or the user told us to ignore layers.
-	ignoreLayers := (len(stages) < 2 && len(stages[0].Node.Children) < 2) || (!b.layers && !b.noCache)
+	singleLineDockerfile := (len(stages) < 2 && len(stages[0].Node.Children) < 1)
+	ignoreLayers := singleLineDockerfile || !b.layers && !b.noCache
 
 	if ignoreLayers {
 		imgID, ref, err := stageExecutor.Commit(ctx, stages[len(stages)-1].Builder, "")
 		if err != nil {
 			return "", nil, err
 		}
+		if singleLineDockerfile {
+			b.log("COMMIT %s", ref)
+		}
 		imageID = imgID
 		imageRef = ref
 	}
@@ -1527,6 +1531,17 @@ func (b *Executor) deleteSuccessfulIntermediateCtrs() error {
 	return lastErr
 }
 
+func (b *Executor) EnsureContainerPath(path string) error {
+	_, err := os.Stat(filepath.Join(b.mountPoint, path))
+	if err != nil && os.IsNotExist(err) {
+		err = os.MkdirAll(filepath.Join(b.mountPoint, path), 0755)
+	}
+	if err != nil {
+		return errors.Wrapf(err, "error ensuring container path %q", path)
+	}
+	return nil
+}
+
 // preprocessDockerfileContents runs CPP(1) in preprocess-only mode on the input
 // dockerfile content and will use ctxDir as the base include path.
 //