lib.Distro, ExecContext: Add classes, refactor lib.distro
The code below lib.distro, as left behind by the previous commit, is geared towards being directly used as a command-line API. This commit introduces the abstract base class Distro, a proxy for distribution-specific interactions. The proxy abstracts distro specifics into an API with proper method prototypes, not argparse.Namespace contents, and can thus be more easily driven by arbitrary code.
The Distro class is initialized with a member variable of type ExecContext, another new class introduced by this commit. It is designed to abstract the communication channel to the distribution instance. Currently only one specialization exists, Local, which interacts with the distribution and root file system it is running in, but is planned to be subclassed to support interaction via SSH, serial, chroot, or chains thereof.
Signed-off-by: Jan Lindemann <jan@janware.com>
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@ -1,64 +1,28 @@
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# -*- coding: utf-8 -*-
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from __future__ import annotations
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from typing import TYPE_CHECKING
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import os, importlib
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from ...lib.log import *
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from ...lib.distros.Util import Util
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if TYPE_CHECKING:
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from ...lib.Distro import Distro
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from ..Cmd import Cmd as Base
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from ..CmdDistro import CmdDistro
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class Cmd(Base): # export
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from ...lib.distros.Backend import Backend
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def __init__(self, parent: CmdDistro, name: str, help: str) -> None:
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super().__init__(parent, name, help)
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self.__backend_path: str|None = None
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self.__util: Util|None = None
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self.__backend: Backend|None = None
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@property
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def distro(self) -> Distro:
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return self.parent.distro
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@property
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def distro_id(self) -> str:
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return self.parent.distro_id
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@property
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def interactive(self) -> bool:
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return self.parent.interactive
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@property
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def _backend_path(self):
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if self.__backend_path is None:
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backend_id = self.parent.distro_id.lower().replace('-', '_')
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match backend_id:
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case 'ubuntu' | 'raspbian' | 'kali':
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backend_id = 'debian'
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case 'centos':
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backend_id = 'redhat'
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case 'opensuse' | 'suse':
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backend_id = 'suse'
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self.__backend_path = 'jw.pkg.lib.distros.' + backend_id + '.'
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return self.__backend_path
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def _instantiate(self, name: str, *args, **kwargs):
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module_path = self._backend_path + name
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try:
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module = importlib.import_module(module_path)
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except Exception as e:
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log(ERR, f'Failed to import module {module_path} ({str(e)})')
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raise
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cls = getattr(module, name)
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return cls(self, *args, **kwargs)
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@property
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def util(self) -> Util:
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if self.__util is None:
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self.__util = self._instantiate('Util')
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return self.__util
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@property
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def _backend(self) -> Backend:
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if self.__backend is None:
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name = self.__class__.__name__[3:] # Get rid of "Cmd"
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self.__backend = self._instantiate(name)
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return self.__backend
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