forked from Mirror/pmbootstrap
31cc898dd5
With the new chroot type, we can now write fancy paths in the pythonic way. Convert most of the codebase over, as well as adding various other type hints. Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
33 lines
1 KiB
Python
33 lines
1 KiB
Python
# Copyright 2023 Lary Gibaud
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# SPDX-License-Identifier: GPL-3.0-or-later
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import re
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from typing import Optional
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def arm_big_little_first_group_ncpus() -> Optional[int]:
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"""
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Infer from /proc/cpuinfo on aarch64 if this is a big/little architecture
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(if there is different processor models) and the number of cores in the
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first model group.
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https://en.wikipedia.org/wiki/ARM_big.LITTLE
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:returns: the number of cores of the first model in the order given by
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linux or None if not big/little architecture
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"""
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pattern = re.compile(r"^CPU part\s*: (\w+)$")
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counter = 0
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part = None
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with open('/proc/cpuinfo', 'r') as cpuinfo:
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for line in cpuinfo:
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match = pattern.match(line)
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if match:
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grp = match.group(1)
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if not part:
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part = grp
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counter += 1
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elif part == grp:
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counter += 1
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else:
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return counter
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return None
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