refactor: Cryptsetup subcommands

zfs-backup.py

@@ -416,11 +416,13 @@ class Cryptsetup:
 
     @classmethod
     def encrypt(cls, mapper_entry: str) -> None:
-        CommandRunner.run([cls._CRYPTSETUP, "close", mapper_entry])
+        command = [cls._CRYPTSETUP, cls._Subcommands.close, mapper_entry]
+        CommandRunner.run(command)
 
     @classmethod
     def _status(cls, name: str) -> str:
-        return CommandRunner.get_output([cls._CRYPTSETUP, "status", name])
+        command = [cls._CRYPTSETUP, cls._Subcommands.status, name]
+        return CommandRunner.get_output(command)
 
     @classmethod
     def decrypt(cls, path: Path, mapper_entry: str) -> bool:
@@ -429,7 +431,8 @@ class Cryptsetup:
                 return True
             print(MAPPER_ENTRY_ALREADY_EXISTS)
             exit(EXIT_ERROR)
-        CommandRunner.run([cls._CRYPTSETUP, "open", str(path), mapper_entry])
+        command = [cls._CRYPTSETUP, cls._Subcommands.open, str(path), mapper_entry]
+        CommandRunner.run(command)
         return False
 
     @classmethod