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Edit File : _musllinux.py \| Size : 2.63 KB
"""PEP 656 support. This module implements logic to detect if the currently running Python is linked against musl, and what musl version is used. """ from __future__ import annotations import functools import re import subprocess import sys from typing import Iterator, NamedTuple, Sequence from ._elffile import ELFFile class _MuslVersion(NamedTuple): major: int minor: int def _parse_musl_version(output: str) -> _MuslVersion \| None: lines = [n for n in (n.strip() for n in output.splitlines()) if n] if len(lines) < 2 or lines[0][:4] != "musl": return None m = re.match(r"Version (\d+)\.(\d+)", lines[1]) if not m: return None return _MuslVersion(major=int(m.group(1)), minor=int(m.group(2))) @functools.lru_cache def _get_musl_version(executable: str) -> _MuslVersion \| None: """Detect currently-running musl runtime version. This is done by checking the specified executable's dynamic linking information, and invoking the loader to parse its output for a version string. If the loader is musl, the output would be something like:: musl libc (x86_64) Version 1.2.2 Dynamic Program Loader """ try: with open(executable, "rb") as f: ld = ELFFile(f).interpreter except (OSError, TypeError, ValueError): return None if ld is None or "musl" not in ld: return None proc = subprocess.run([ld], stderr=subprocess.PIPE, text=True) return _parse_musl_version(proc.stderr) def platform_tags(archs: Sequence[str]) -> Iterator[str]: """Generate musllinux tags compatible to the current platform. :param archs: Sequence of compatible architectures. The first one shall be the closest to the actual architecture and be the part of platform tag after the ``linux_`` prefix, e.g. ``x86_64``. The ``linux_`` prefix is assumed as a prerequisite for the current platform to be musllinux-compatible. :returns: An iterator of compatible musllinux tags. """ sys_musl = _get_musl_version(sys.executable) if sys_musl is None: # Python not dynamically linked against musl. return for arch in archs: for minor in range(sys_musl.minor, -1, -1): yield f"musllinux_{sys_musl.major}_{minor}_{arch}" if __name__ == "__main__": # pragma: no cover import sysconfig plat = sysconfig.get_platform() assert plat.startswith("linux-"), "not linux" print("plat:", plat) print("musl:", _get_musl_version(sys.executable)) print("tags:", end=" ") for t in platform_tags(re.sub(r"[.-]", "_", plat.split("-", 1)[-1])): print(t, end="\n ") Back

Edit File : _musllinux.py | Size : 2.63 KB

"""PEP 656 support.

This module implements logic to detect if the currently running Python is
linked against musl, and what musl version is used.
"""

from __future__ import annotations

import functools
import re
import subprocess
import sys
from typing import Iterator, NamedTuple, Sequence

from ._elffile import ELFFile

class _MuslVersion(NamedTuple):
    major: int
    minor: int

def _parse_musl_version(output: str) -> _MuslVersion | None:
    lines = [n for n in (n.strip() for n in output.splitlines()) if n]
    if len(lines) < 2 or lines[0][:4] != "musl":
        return None
    m = re.match(r"Version (\d+)\.(\d+)", lines[1])
    if not m:
        return None
    return _MuslVersion(major=int(m.group(1)), minor=int(m.group(2)))

@functools.lru_cache
def _get_musl_version(executable: str) -> _MuslVersion | None:
    """Detect currently-running musl runtime version.

This is done by checking the specified executable's dynamic linking
    information, and invoking the loader to parse its output for a version
    string. If the loader is musl, the output would be something like::

musl libc (x86_64)
        Version 1.2.2
        Dynamic Program Loader
    """
    try:
        with open(executable, "rb") as f:
            ld = ELFFile(f).interpreter
    except (OSError, TypeError, ValueError):
        return None
    if ld is None or "musl" not in ld:
        return None
    proc = subprocess.run([ld], stderr=subprocess.PIPE, text=True)
    return _parse_musl_version(proc.stderr)

def platform_tags(archs: Sequence[str]) -> Iterator[str]:
    """Generate musllinux tags compatible to the current platform.

:param archs: Sequence of compatible architectures.
        The first one shall be the closest to the actual architecture and be the part of
        platform tag after the ``linux_`` prefix, e.g. ``x86_64``.
        The ``linux_`` prefix is assumed as a prerequisite for the current platform to
        be musllinux-compatible.

:returns: An iterator of compatible musllinux tags.
    """
    sys_musl = _get_musl_version(sys.executable)
    if sys_musl is None:  # Python not dynamically linked against musl.
        return
    for arch in archs:
        for minor in range(sys_musl.minor, -1, -1):
            yield f"musllinux_{sys_musl.major}_{minor}_{arch}"

if __name__ == "__main__":  # pragma: no cover
    import sysconfig

plat = sysconfig.get_platform()
    assert plat.startswith("linux-"), "not linux"

print("plat:", plat)
    print("musl:", _get_musl_version(sys.executable))
    print("tags:", end=" ")
    for t in platform_tags(re.sub(r"[.-]", "_", plat.split("-", 1)[-1])):
        print(t, end="\n      ")

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