install: create file directory before file is created

Fixes #59

cmd/install/utils.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 )
 
 func lineInFile(name string, lookFor string) bool {
@@ -37,11 +38,19 @@ func lineInFile(name string, lookFor string) bool {
 }
 
 func createFile(name string, content string) error {
+	// make sure file directory exists
+	if err := os.MkdirAll(filepath.Dir(name), 0775); err != nil {
+		return err
+	}
+
+	// create the file
 	f, err := os.Create(name)
 	if err != nil {
 		return err
 	}
 	defer f.Close()
+
+	// write file content
 	_, err = f.WriteString(fmt.Sprintf("%s\n", content))
 	return err
 }