84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
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"""PEP 656 support.
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This module implements logic to detect if the currently running Python is
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linked against musl, and what musl version is used.
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"""
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import functools
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import re
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import subprocess
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import sys
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from typing import Iterator, NamedTuple, Optional, Sequence
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from ._elffile import ELFFile
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class _MuslVersion(NamedTuple):
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major: int
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minor: int
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def _parse_musl_version(output: str) -> Optional[_MuslVersion]:
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lines = [n for n in (n.strip() for n in output.splitlines()) if n]
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if len(lines) < 2 or lines[0][:4] != "musl":
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return None
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m = re.match(r"Version (\d+)\.(\d+)", lines[1])
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if not m:
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return None
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return _MuslVersion(major=int(m.group(1)), minor=int(m.group(2)))
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@functools.lru_cache()
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def _get_musl_version(executable: str) -> Optional[_MuslVersion]:
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"""Detect currently-running musl runtime version.
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This is done by checking the specified executable's dynamic linking
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information, and invoking the loader to parse its output for a version
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string. If the loader is musl, the output would be something like::
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musl libc (x86_64)
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Version 1.2.2
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Dynamic Program Loader
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"""
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try:
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with open(executable, "rb") as f:
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ld = ELFFile(f).interpreter
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except (OSError, TypeError, ValueError):
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return None
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if ld is None or "musl" not in ld:
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return None
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proc = subprocess.run([ld], stderr=subprocess.PIPE, text=True)
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return _parse_musl_version(proc.stderr)
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def platform_tags(archs: Sequence[str]) -> Iterator[str]:
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"""Generate musllinux tags compatible to the current platform.
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:param archs: Sequence of compatible architectures.
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The first one shall be the closest to the actual architecture and be the part of
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platform tag after the ``linux_`` prefix, e.g. ``x86_64``.
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The ``linux_`` prefix is assumed as a prerequisite for the current platform to
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be musllinux-compatible.
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:returns: An iterator of compatible musllinux tags.
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"""
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sys_musl = _get_musl_version(sys.executable)
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if sys_musl is None: # Python not dynamically linked against musl.
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return
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for arch in archs:
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for minor in range(sys_musl.minor, -1, -1):
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yield f"musllinux_{sys_musl.major}_{minor}_{arch}"
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if __name__ == "__main__": # pragma: no cover
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import sysconfig
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plat = sysconfig.get_platform()
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assert plat.startswith("linux-"), "not linux"
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print("plat:", plat)
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print("musl:", _get_musl_version(sys.executable))
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print("tags:", end=" ")
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for t in platform_tags(re.sub(r"[.-]", "_", plat.split("-", 1)[-1])):
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print(t, end="\n ")
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