Richie
b252b0bf6e
Replace old_installer.py with a curses TUI installer packaged as a one-file PyInstaller binary (python/installer/build.py, wrapped by python/installer/package.nix). The default .#installer is patched to run on foreign Linux live media; the new .#installer-nixos variant keeps its Nix store interpreter so it runs on NixOS. Add systems/iso, a minimal NixOS install CD with kernel 6.18 and ZFS 2.4 matching the deployed systems and the installer on PATH; build it with nix build .#iso. Shared logging and subprocess helpers move out of common.py into python/logging_config.py and python/process.py.
53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
"""Small subprocess helpers."""
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from __future__ import annotations
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import logging
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import shutil
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from subprocess import run
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from collections.abc import Iterable, Sequence
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logger = logging.getLogger(__name__)
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class CommandError(RuntimeError):
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"""Raised when an external command fails."""
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def __init__(self, command: Sequence[str], returncode: int, stderr: str) -> None:
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"""Store command failure details."""
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command_text = " ".join(command)
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super().__init__(f"Failed to run command {command_text!r}: exit {returncode}\n{stderr}")
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self.command = command
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self.returncode = returncode
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self.stderr = stderr
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class MissingCommandsError(RuntimeError):
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"""Raised when required external commands are not available."""
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def __init__(self, commands: Sequence[str]) -> None:
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"""Store missing command details."""
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missing = ", ".join(commands)
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super().__init__(f"Missing required installer commands: {missing}")
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self.commands = commands
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def require_commands(commands: Iterable[str]) -> None:
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"""Raise when one or more executables are missing from PATH."""
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missing_commands = sorted({command for command in commands if shutil.which(command) is None})
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if missing_commands:
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raise MissingCommandsError(missing_commands)
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def run_output(command: Sequence[str]) -> str:
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"""Run a command and return stdout."""
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logger.debug("running command=%s", command)
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result = run(command, capture_output=True, text=True, check=False)
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if result.returncode != 0:
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raise CommandError(command, result.returncode, result.stderr)
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return result.stdout
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