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Current File : /opt/alt/python310/lib/python3.10/site-packages/pip/_vendor/packaging/_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 contextlib
import functools
import operator
import os
import re
import struct
import subprocess
import sys
from typing import IO, Iterator, NamedTuple, Optional, Tuple


def _read_unpacked(f: IO[bytes], fmt: str) -> Tuple[int, ...]:
    return struct.unpack(fmt, f.read(struct.calcsize(fmt)))


def _parse_ld_musl_from_elf(f: IO[bytes]) -> Optional[str]:
    """Detect musl libc location by parsing the Python executable.

    Based on: https://gist.github.com/lyssdod/f51579ae8d93c8657a5564aefc2ffbca
    ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html
    """
    f.seek(0)
    try:
        ident = _read_unpacked(f, "16B")
    except struct.error:
        return None
    if ident[:4] != tuple(b"\x7fELF"):  # Invalid magic, not ELF.
        return None
    f.seek(struct.calcsize("HHI"), 1)  # Skip file type, machine, and version.

    try:
        # e_fmt: Format for program header.
        # p_fmt: Format for section header.
        # p_idx: Indexes to find p_type, p_offset, and p_filesz.
        e_fmt, p_fmt, p_idx = {
            1: ("IIIIHHH", "IIIIIIII", (0, 1, 4)),  # 32-bit.
            2: ("QQQIHHH", "IIQQQQQQ", (0, 2, 5)),  # 64-bit.
        }[ident[4]]
    except KeyError:
        return None
    else:
        p_get = operator.itemgetter(*p_idx)

    # Find the interpreter section and return its content.
    try:
        _, e_phoff, _, _, _, e_phentsize, e_phnum = _read_unpacked(f, e_fmt)
    except struct.error:
        return None
    for i in range(e_phnum + 1):
        f.seek(e_phoff + e_phentsize * i)
        try:
            p_type, p_offset, p_filesz = p_get(_read_unpacked(f, p_fmt))
        except struct.error:
            return None
        if p_type != 3:  # Not PT_INTERP.
            continue
        f.seek(p_offset)
        interpreter = os.fsdecode(f.read(p_filesz)).strip("\0")
        if "musl" not in interpreter:
            return None
        return interpreter
    return None


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
    """
    with contextlib.ExitStack() as stack:
        try:
            f = stack.enter_context(open(executable, "rb"))
        except IOError:
            return None
        ld = _parse_ld_musl_from_elf(f)
    if not ld:
        return None
    proc = subprocess.run([ld], stderr=subprocess.PIPE, universal_newlines=True)
    return _parse_musl_version(proc.stderr)


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

    :param arch: Should 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 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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