venv/lib/python3.6/site-packages/pip/_vendor/packaging/_manylinux.py - third_party/shuttle/sky130/mpw-008/slot-034 - Git at Google

 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)
	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)