FM / packaging

/usr/lib/python3/dist-packages/packaging/

/usr/lib/python3/dist-packages/packaging

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
markers.py	8475	0644	edit dl rm
py.typed	0	0644	edit dl rm
requirements.py	4664	0644	edit dl rm
specifiers.py	30110	0644	edit dl rm
tags.py	15699	0644	edit dl rm
utils.py	4200	0644	edit dl rm
version.py	14665	0644	edit dl rm
_manylinux.py	11488	0644	edit dl rm
_musllinux.py	4378	0644	edit dl rm
_structures.py	1431	0644	edit dl rm
__about__.py	661	0644	edit dl rm
__init__.py	497	0644	edit dl rm

Edit: /usr/lib/python3/dist-packages/packaging/_manylinux.py (11488B)

import collections
import functools
import os
import re
import struct
import sys
import warnings
from typing import IO, Dict, Iterator, NamedTuple, Optional, Tuple

# Python does not provide platform information at sufficient granularity to
# identify the architecture of the running executable in some cases, so we
# determine it dynamically by reading the information from the running
# process. This only applies on Linux, which uses the ELF format.
class _ELFFileHeader:
    # https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header
    class _InvalidELFFileHeader(ValueError):
        """
        An invalid ELF file header was found.
        """

ELF_MAGIC_NUMBER = 0x7F454C46
    ELFCLASS32 = 1
    ELFCLASS64 = 2
    ELFDATA2LSB = 1
    ELFDATA2MSB = 2
    EM_386 = 3
    EM_S390 = 22
    EM_ARM = 40
    EM_X86_64 = 62
    EF_ARM_ABIMASK = 0xFF000000
    EF_ARM_ABI_VER5 = 0x05000000
    EF_ARM_ABI_FLOAT_HARD = 0x00000400

def __init__(self, file: IO[bytes]) -> None:
        def unpack(fmt: str) -> int:
            try:
                data = file.read(struct.calcsize(fmt))
                result: Tuple[int, ...] = struct.unpack(fmt, data)
            except struct.error:
                raise _ELFFileHeader._InvalidELFFileHeader()
            return result[0]

self.e_ident_magic = unpack(">I")
        if self.e_ident_magic != self.ELF_MAGIC_NUMBER:
            raise _ELFFileHeader._InvalidELFFileHeader()
        self.e_ident_class = unpack("B")
        if self.e_ident_class not in {self.ELFCLASS32, self.ELFCLASS64}:
            raise _ELFFileHeader._InvalidELFFileHeader()
        self.e_ident_data = unpack("B")
        if self.e_ident_data not in {self.ELFDATA2LSB, self.ELFDATA2MSB}:
            raise _ELFFileHeader._InvalidELFFileHeader()
        self.e_ident_version = unpack("B")
        self.e_ident_osabi = unpack("B")
        self.e_ident_abiversion = unpack("B")
        self.e_ident_pad = file.read(7)
        format_h = "<H" if self.e_ident_data == self.ELFDATA2LSB else ">H"
        format_i = "<I" if self.e_ident_data == self.ELFDATA2LSB else ">I"
        format_q = "<Q" if self.e_ident_data == self.ELFDATA2LSB else ">Q"
        format_p = format_i if self.e_ident_class == self.ELFCLASS32 else format_q
        self.e_type = unpack(format_h)
        self.e_machine = unpack(format_h)
        self.e_version = unpack(format_i)
        self.e_entry = unpack(format_p)
        self.e_phoff = unpack(format_p)
        self.e_shoff = unpack(format_p)
        self.e_flags = unpack(format_i)
        self.e_ehsize = unpack(format_h)
        self.e_phentsize = unpack(format_h)
        self.e_phnum = unpack(format_h)
        self.e_shentsize = unpack(format_h)
        self.e_shnum = unpack(format_h)
        self.e_shstrndx = unpack(format_h)

def _get_elf_header() -> Optional[_ELFFileHeader]:
    try:
        with open(sys.executable, "rb") as f:
            elf_header = _ELFFileHeader(f)
    except (OSError, TypeError, _ELFFileHeader._InvalidELFFileHeader):
        return None
    return elf_header

def _is_linux_armhf() -> bool:
    # hard-float ABI can be detected from the ELF header of the running
    # process
    # https://static.docs.arm.com/ihi0044/g/aaelf32.pdf
    elf_header = _get_elf_header()
    if elf_header is None:
        return False
    result = elf_header.e_ident_class == elf_header.ELFCLASS32
    result &= elf_header.e_ident_data == elf_header.ELFDATA2LSB
    result &= elf_header.e_machine == elf_header.EM_ARM
    result &= (
        elf_header.e_flags & elf_header.EF_ARM_ABIMASK
    ) == elf_header.EF_ARM_ABI_VER5
    result &= (
        elf_header.e_flags & elf_header.EF_ARM_ABI_FLOAT_HARD
    ) == elf_header.EF_ARM_ABI_FLOAT_HARD
    return result

def _is_linux_i686() -> bool:
    elf_header = _get_elf_header()
    if elf_header is None:
        return False
    result = elf_header.e_ident_class == elf_header.ELFCLASS32
    result &= elf_header.e_ident_data == elf_header.ELFDATA2LSB
    result &= elf_header.e_machine == elf_header.EM_386
    return result

def _have_compatible_abi(arch: str) -> bool:
    if arch == "armv7l":
        return _is_linux_armhf()
    if arch == "i686":
        return _is_linux_i686()
    return arch in {"x86_64", "aarch64", "ppc64", "ppc64le", "s390x"}

# If glibc ever changes its major version, we need to know what the last
# minor version was, so we can build the complete list of all versions.
# For now, guess what the highest minor version might be, assume it will
# be 50 for testing. Once this actually happens, update the dictionary
# with the actual value.
_LAST_GLIBC_MINOR: Dict[int, int] = collections.defaultdict(lambda: 50)

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

def _glibc_version_string_confstr() -> Optional[str]:
    """
    Primary implementation of glibc_version_string using os.confstr.
    """
    # os.confstr is quite a bit faster than ctypes.DLL. It's also less likely
    # to be broken or missing. This strategy is used in the standard library
    # platform module.
    # https://github.com/python/cpython/blob/fcf1d003bf4f0100c/Lib/platform.py#L175-L183
    try:
        # os.confstr("CS_GNU_LIBC_VERSION") returns a string like "glibc 2.17".
        version_string = os.confstr("CS_GNU_LIBC_VERSION")
        assert version_string is not None
        _, version = version_string.split()
    except (AssertionError, AttributeError, OSError, ValueError):
        # os.confstr() or CS_GNU_LIBC_VERSION not available (or a bad value)...
        return None
    return version

def _glibc_version_string_ctypes() -> Optional[str]:
    """
    Fallback implementation of glibc_version_string using ctypes.
    """
    try:
        import ctypes
    except ImportError:
        return None

# ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen
    # manpage says, "If filename is NULL, then the returned handle is for the
    # main program". This way we can let the linker do the work to figure out
    # which libc our process is actually using.
    #
    # We must also handle the special case where the executable is not a
    # dynamically linked executable. This can occur when using musl libc,
    # for example. In this situation, dlopen() will error, leading to an
    # OSError. Interestingly, at least in the case of musl, there is no
    # errno set on the OSError. The single string argument used to construct
    # OSError comes from libc itself and is therefore not portable to
    # hard code here. In any case, failure to call dlopen() means we
    # can proceed, so we bail on our attempt.
    try:
        process_namespace = ctypes.CDLL(None)
    except OSError:
        return None

try:
        gnu_get_libc_version = process_namespace.gnu_get_libc_version
    except AttributeError:
        # Symbol doesn't exist -> therefore, we are not linked to
        # glibc.
        return None

# Call gnu_get_libc_version, which returns a string like "2.5"
    gnu_get_libc_version.restype = ctypes.c_char_p
    version_str: str = gnu_get_libc_version()
    # py2 / py3 compatibility:
    if not isinstance(version_str, str):
        version_str = version_str.decode("ascii")

return version_str

def _glibc_version_string() -> Optional[str]:
    """Returns glibc version string, or None if not using glibc."""
    return _glibc_version_string_confstr() or _glibc_version_string_ctypes()

def _parse_glibc_version(version_str: str) -> Tuple[int, int]:
    """Parse glibc version.

We use a regexp instead of str.split because we want to discard any
    random junk that might come after the minor version -- this might happen
    in patched/forked versions of glibc (e.g. Linaro's version of glibc
    uses version strings like "2.20-2014.11"). See gh-3588.
    """
    m = re.match(r"(?P<major>[0-9]+)\.(?P<minor>[0-9]+)", version_str)
    if not m:
        warnings.warn(
            "Expected glibc version with 2 components major.minor,"
            " got: %s" % version_str,
            RuntimeWarning,
        )
        return -1, -1
    return int(m.group("major")), int(m.group("minor"))

@functools.lru_cache()
def _get_glibc_version() -> Tuple[int, int]:
    version_str = _glibc_version_string()
    if version_str is None:
        return (-1, -1)
    return _parse_glibc_version(version_str)

# From PEP 513, PEP 600
def _is_compatible(name: str, arch: str, version: _GLibCVersion) -> bool:
    sys_glibc = _get_glibc_version()
    if sys_glibc < version:
        return False
    # Check for presence of _manylinux module.
    try:
        import _manylinux  # noqa
    except ImportError:
        return True
    if hasattr(_manylinux, "manylinux_compatible"):
        result = _manylinux.manylinux_compatible(version[0], version[1], arch)
        if result is not None:
            return bool(result)
        return True
    if version == _GLibCVersion(2, 5):
        if hasattr(_manylinux, "manylinux1_compatible"):
            return bool(_manylinux.manylinux1_compatible)
    if version == _GLibCVersion(2, 12):
        if hasattr(_manylinux, "manylinux2010_compatible"):
            return bool(_manylinux.manylinux2010_compatible)
    if version == _GLibCVersion(2, 17):
        if hasattr(_manylinux, "manylinux2014_compatible"):
            return bool(_manylinux.manylinux2014_compatible)
    return True

_LEGACY_MANYLINUX_MAP = {
    # CentOS 7 w/ glibc 2.17 (PEP 599)
    (2, 17): "manylinux2014",
    # CentOS 6 w/ glibc 2.12 (PEP 571)
    (2, 12): "manylinux2010",
    # CentOS 5 w/ glibc 2.5 (PEP 513)
    (2, 5): "manylinux1",
}

def platform_tags(linux: str, arch: str) -> Iterator[str]:
    if not _have_compatible_abi(arch):
        return
    # Oldest glibc to be supported regardless of architecture is (2, 17).
    too_old_glibc2 = _GLibCVersion(2, 16)
    if arch in {"x86_64", "i686"}:
        # On x86/i686 also oldest glibc to be supported is (2, 5).
        too_old_glibc2 = _GLibCVersion(2, 4)
    current_glibc = _GLibCVersion(*_get_glibc_version())
    glibc_max_list = [current_glibc]
    # We can assume compatibility across glibc major versions.
    # https://sourceware.org/bugzilla/show_bug.cgi?id=24636
    #
    # Build a list of maximum glibc versions so that we can
    # output the canonical list of all glibc from current_glibc
    # down to too_old_glibc2, including all intermediary versions.
    for glibc_major in range(current_glibc.major - 1, 1, -1):
        glibc_minor = _LAST_GLIBC_MINOR[glibc_major]
        glibc_max_list.append(_GLibCVersion(glibc_major, glibc_minor))
    for glibc_max in glibc_max_list:
        if glibc_max.major == too_old_glibc2.major:
            min_minor = too_old_glibc2.minor
        else:
            # For other glibc major versions oldest supported is (x, 0).
            min_minor = -1
        for glibc_minor in range(glibc_max.minor, min_minor, -1):
            glibc_version = _GLibCVersion(glibc_max.major, glibc_minor)
            tag = "manylinux_{}_{}".format(*glibc_version)
            if _is_compatible(tag, arch, glibc_version):
                yield linux.replace("linux", tag)
            # Handle the legacy manylinux1, manylinux2010, manylinux2014 tags.
            if glibc_version in _LEGACY_MANYLINUX_MAP:
                legacy_tag = _LEGACY_MANYLINUX_MAP[glibc_version]
                if _is_compatible(legacy_tag, arch, glibc_version):
                    yield linux.replace("linux", legacy_tag)

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