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- """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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