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__pycache__/	dir	-	0755	2026-01-26 04:08:15
__init__.py	file	496 B	0644	2024-04-02 15:20:50	edit
_elffile.py	file	3,266 B	0644	2024-04-02 15:20:50	edit
_manylinux.py	file	9,590 B	0644	2024-04-02 15:20:50	edit
_musllinux.py	file	2,676 B	0644	2024-04-02 15:20:50	edit
_parser.py	file	10,347 B	0644	2024-04-02 15:20:50	edit
_structures.py	file	1,431 B	0644	2024-04-02 15:20:50	edit
_tokenizer.py	file	5,292 B	0644	2024-04-02 15:20:50	edit
markers.py	file	8,208 B	0644	2024-04-02 15:20:50	edit
metadata.py	file	33,036 B	0644	2024-04-02 15:20:50	edit
py.typed	file	0 B	0644	2024-04-02 15:20:50	edit
requirements.py	file	2,933 B	0644	2024-04-02 15:20:50	edit
specifiers.py	file	39,784 B	0644	2024-04-02 15:20:50	edit
tags.py	file	18,950 B	0644	2024-04-02 15:20:50	edit
utils.py	file	5,268 B	0644	2024-04-02 15:20:50	edit
version.py	file	16,236 B	0644	2024-04-02 15:20:50	edit

editing: _musllinux.py

"""PEP 656 support.

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

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

from ._elffile import ELFFile

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

def _parse_musl_version(output: str) -> Optional[_MuslVersion]:
    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) -> Optional[_MuslVersion]:
    """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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