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8b264f8823
drgn was originally my side project, but for awhile now it's also been my work project. Update the copyright headers to reflect this, and add a copyright header to various files that were missing it.
110 lines
3.1 KiB
Python
110 lines
3.1 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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# SPDX-License-Identifier: GPL-3.0+
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from functools import total_ordering
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import os
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import re
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def nproc() -> int:
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return len(os.sched_getaffinity(0))
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def out_of_date(path: str, *deps: str) -> bool:
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try:
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mtime = os.stat(path).st_mtime
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except FileNotFoundError:
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return True
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return any(os.stat(dep).st_mtime > mtime for dep in deps)
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def _c_isdigit(c: int) -> bool:
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# '0' <= c <= '9'
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return 0x30 <= c <= 0x39
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def _c_isalpha(c: int) -> bool:
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# ('A' <= c <= 'Z') or ('a' <= c <= 'z')
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return (0x41 <= c <= 0x5A) or (0x61 <= c <= 0x7A)
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def _order(c: int) -> int:
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if _c_isdigit(c):
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return 0
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elif _c_isalpha(c):
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return c
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elif c == 0x7E: # '~'
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return -1
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else:
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return c + 0x100
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def verrevcmp(v1: str, v2: str) -> int:
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"""
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Compare two versions according to the coreutils version sort rules
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(https://www.gnu.org/software/coreutils/manual/html_node/Version_002dsort-ordering-rules.html).
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Returns 0 if v1 == v2 by this definition, < 0 if v1 < v2, and > 0 if v1 >
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v2.
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Adapted from
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https://git.savannah.gnu.org/cgit/gnulib.git/tree/lib/filevercmp.c.
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"""
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# By definition, version sort compares ASCII, not Unicode:
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# https://www.gnu.org/software/coreutils/manual/html_node/Version-sort-ignores-locale.html.
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s1 = bytearray(v1, "utf-8")
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s2 = bytearray(v2, "utf-8")
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s1_len = len(s1)
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s2_len = len(s2)
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# Add sentinels to avoid some length checks.
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s1.append(0)
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s2.append(0)
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s1_pos = s2_pos = 0
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while s1_pos < s1_len or s2_pos < s2_len:
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while (s1_pos < s1_len and not _c_isdigit(s1[s1_pos])) or (
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s2_pos < s2_len and not _c_isdigit(s2[s2_pos])
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):
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s1_c = _order(s1[s1_pos]) if s1_pos < s1_len else 0
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s2_c = _order(s2[s2_pos]) if s2_pos < s2_len else 0
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if s1_c != s2_c:
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return s1_c - s2_c
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s1_pos += 1
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s2_pos += 1
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while s1[s1_pos] == 0x30: # '0'
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s1_pos += 1
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while s2[s2_pos] == 0x30: # '0'
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s2_pos += 1
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first_diff = 0
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while _c_isdigit(s1[s1_pos]) and _c_isdigit(s2[s2_pos]):
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if not first_diff:
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first_diff = s1[s1_pos] - s2[s2_pos]
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s1_pos += 1
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s2_pos += 1
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if _c_isdigit(s1[s1_pos]):
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return 1
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if _c_isdigit(s2[s2_pos]):
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return -1
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if first_diff:
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return first_diff
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return 0
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@total_ordering
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class KernelVersion:
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"""
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Version ordered by verrevcmp(), with -rc releases before the final release.
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"""
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def __init__(self, release: str) -> None:
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# ~ sorts before anything, including the end of the version.
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self._key = re.sub(r"-(rc[0-9])", r"~\1", release)
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, KernelVersion):
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return NotImplemented
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return self._key == other._key
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def __lt__(self, other: object) -> bool:
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if not isinstance(other, KernelVersion):
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return NotImplemented
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return verrevcmp(self._key, other._key) < 0
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