Create all directories before creating a new file

Summary: Resolves facebookincubator#506

Differential Revision: D61658174

pkg/blocks/createfile.go

@@ -22,6 +22,7 @@ package blocks
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 
 	"github.com/facebookincubator/ttpforge/pkg/fileutils"
 	"github.com/facebookincubator/ttpforge/pkg/logging"
@@ -94,6 +95,15 @@ func (s *CreateFileStep) Execute(_ TTPExecutionContext) (*ActResult, error) {
 		mode = 0666
 	}
 
+	dir := filepath.Dir(pathToCreate)
+	exists, err = afero.Exists(fsys, dir)
+	if err != nil {
+		return nil, err
+	}
+	if !exists {
+		fsys.MkdirAll(dir, os.ModePerm)
+	}
+
 	// actually write the file
 	f, err := fsys.OpenFile(pathToCreate, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(mode))
 	if err != nil {