36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
# Copyright 2023 Anjandev Momi
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# SPDX-License-Identifier: GPL-3.0-or-later
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import os
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import shutil
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from functools import lru_cache
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@lru_cache()
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def which_sudo() -> str | None:
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"""Returns a command required to run commands as root, if any.
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Find whether sudo or doas is installed for commands that require root.
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Allows user to override preferred sudo with PMB_SUDO env variable.
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"""
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if os.getuid() == 0:
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return None
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supported_sudos = ['doas', 'sudo']
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user_set_sudo = os.getenv("PMB_SUDO")
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if user_set_sudo is not None:
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if shutil.which(user_set_sudo) is None:
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raise RuntimeError("PMB_SUDO environmental variable is set to"
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f" {user_set_sudo} but pmbootstrap cannot find"
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" this command on your system.")
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return user_set_sudo
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for sudo in supported_sudos:
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if shutil.which(sudo) is not None:
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return sudo
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raise RuntimeError("Can't find sudo or doas required to run pmbootstrap."
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" Please install sudo, doas, or specify your own sudo"
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" with the PMB_SUDO environmental variable.")
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