refactor: Use explicit reader/writer instead of filepath for drive

pkg/config/config.go

@@ -1,7 +1,26 @@
 package config
 
-type StateConfig struct {
-	Drive    string
+import (
+	"io"
+	"os"
+)
+
+type DriveReaderConfig struct {
+	Drive          io.ReadSeeker
+	DriveIsRegular bool
+}
+
+type DriveWriterConfig struct {
+	Drive          io.Writer
+	DriveIsRegular bool
+}
+
+type DriveConfig struct {
+	Drive          *os.File
+	DriveIsRegular bool
+}
+
+type MetadataConfig struct {
 	Metadata string
 }
 
@@ -16,3 +35,7 @@ type CryptoConfig struct {
 	Identity  interface{}
 	Password  string
 }
+
+type PasswordConfig struct {
+	Password string
+}