302 lines
11 KiB
Python
302 lines
11 KiB
Python
import collections
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import functools
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import os
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import re
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import struct
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import sys
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import warnings
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from typing import IO, Dict, Iterator, NamedTuple, Optional, Tuple
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# Python does not provide platform information at sufficient granularity to
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# identify the architecture of the running executable in some cases, so we
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# determine it dynamically by reading the information from the running
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# process. This only applies on Linux, which uses the ELF format.
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class _ELFFileHeader:
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# https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header
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class _InvalidELFFileHeader(ValueError):
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"""
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An invalid ELF file header was found.
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"""
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ELF_MAGIC_NUMBER = 0x7F454C46
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ELFCLASS32 = 1
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ELFCLASS64 = 2
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ELFDATA2LSB = 1
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ELFDATA2MSB = 2
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EM_386 = 3
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EM_S390 = 22
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EM_ARM = 40
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EM_X86_64 = 62
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EF_ARM_ABIMASK = 0xFF000000
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EF_ARM_ABI_VER5 = 0x05000000
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EF_ARM_ABI_FLOAT_HARD = 0x00000400
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def __init__(self, file: IO[bytes]) -> None:
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def unpack(fmt: str) -> int:
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try:
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data = file.read(struct.calcsize(fmt))
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result: Tuple[int, ...] = struct.unpack(fmt, data)
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except struct.error:
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raise _ELFFileHeader._InvalidELFFileHeader()
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return result[0]
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self.e_ident_magic = unpack(">I")
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if self.e_ident_magic != self.ELF_MAGIC_NUMBER:
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raise _ELFFileHeader._InvalidELFFileHeader()
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self.e_ident_class = unpack("B")
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if self.e_ident_class not in {self.ELFCLASS32, self.ELFCLASS64}:
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raise _ELFFileHeader._InvalidELFFileHeader()
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self.e_ident_data = unpack("B")
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if self.e_ident_data not in {self.ELFDATA2LSB, self.ELFDATA2MSB}:
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raise _ELFFileHeader._InvalidELFFileHeader()
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self.e_ident_version = unpack("B")
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self.e_ident_osabi = unpack("B")
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self.e_ident_abiversion = unpack("B")
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self.e_ident_pad = file.read(7)
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format_h = "<H" if self.e_ident_data == self.ELFDATA2LSB else ">H"
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format_i = "<I" if self.e_ident_data == self.ELFDATA2LSB else ">I"
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format_q = "<Q" if self.e_ident_data == self.ELFDATA2LSB else ">Q"
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format_p = format_i if self.e_ident_class == self.ELFCLASS32 else format_q
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self.e_type = unpack(format_h)
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self.e_machine = unpack(format_h)
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self.e_version = unpack(format_i)
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self.e_entry = unpack(format_p)
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self.e_phoff = unpack(format_p)
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self.e_shoff = unpack(format_p)
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self.e_flags = unpack(format_i)
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self.e_ehsize = unpack(format_h)
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self.e_phentsize = unpack(format_h)
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self.e_phnum = unpack(format_h)
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self.e_shentsize = unpack(format_h)
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self.e_shnum = unpack(format_h)
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self.e_shstrndx = unpack(format_h)
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def _get_elf_header() -> Optional[_ELFFileHeader]:
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try:
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with open(sys.executable, "rb") as f:
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elf_header = _ELFFileHeader(f)
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except (OSError, TypeError, _ELFFileHeader._InvalidELFFileHeader):
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return None
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return elf_header
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def _is_linux_armhf() -> bool:
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# hard-float ABI can be detected from the ELF header of the running
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# process
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# https://static.docs.arm.com/ihi0044/g/aaelf32.pdf
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elf_header = _get_elf_header()
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if elf_header is None:
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return False
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result = elf_header.e_ident_class == elf_header.ELFCLASS32
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result &= elf_header.e_ident_data == elf_header.ELFDATA2LSB
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result &= elf_header.e_machine == elf_header.EM_ARM
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result &= (
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elf_header.e_flags & elf_header.EF_ARM_ABIMASK
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) == elf_header.EF_ARM_ABI_VER5
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result &= (
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elf_header.e_flags & elf_header.EF_ARM_ABI_FLOAT_HARD
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) == elf_header.EF_ARM_ABI_FLOAT_HARD
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return result
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def _is_linux_i686() -> bool:
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elf_header = _get_elf_header()
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if elf_header is None:
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return False
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result = elf_header.e_ident_class == elf_header.ELFCLASS32
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result &= elf_header.e_ident_data == elf_header.ELFDATA2LSB
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result &= elf_header.e_machine == elf_header.EM_386
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return result
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def _have_compatible_abi(arch: str) -> bool:
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if arch == "armv7l":
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return _is_linux_armhf()
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if arch == "i686":
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return _is_linux_i686()
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return arch in {"x86_64", "aarch64", "ppc64", "ppc64le", "s390x"}
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# If glibc ever changes its major version, we need to know what the last
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# minor version was, so we can build the complete list of all versions.
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# For now, guess what the highest minor version might be, assume it will
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# be 50 for testing. Once this actually happens, update the dictionary
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# with the actual value.
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_LAST_GLIBC_MINOR: Dict[int, int] = collections.defaultdict(lambda: 50)
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class _GLibCVersion(NamedTuple):
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major: int
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minor: int
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def _glibc_version_string_confstr() -> Optional[str]:
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"""
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Primary implementation of glibc_version_string using os.confstr.
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"""
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# os.confstr is quite a bit faster than ctypes.DLL. It's also less likely
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# to be broken or missing. This strategy is used in the standard library
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# platform module.
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# https://github.com/python/cpython/blob/fcf1d003bf4f0100c/Lib/platform.py#L175-L183
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try:
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# os.confstr("CS_GNU_LIBC_VERSION") returns a string like "glibc 2.17".
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version_string = os.confstr("CS_GNU_LIBC_VERSION")
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assert version_string is not None
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_, version = version_string.split()
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except (AssertionError, AttributeError, OSError, ValueError):
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# os.confstr() or CS_GNU_LIBC_VERSION not available (or a bad value)...
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return None
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return version
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def _glibc_version_string_ctypes() -> Optional[str]:
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"""
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Fallback implementation of glibc_version_string using ctypes.
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"""
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try:
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import ctypes
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except ImportError:
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return None
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# ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen
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# manpage says, "If filename is NULL, then the returned handle is for the
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# main program". This way we can let the linker do the work to figure out
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# which libc our process is actually using.
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#
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# We must also handle the special case where the executable is not a
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# dynamically linked executable. This can occur when using musl libc,
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# for example. In this situation, dlopen() will error, leading to an
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# OSError. Interestingly, at least in the case of musl, there is no
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# errno set on the OSError. The single string argument used to construct
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# OSError comes from libc itself and is therefore not portable to
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# hard code here. In any case, failure to call dlopen() means we
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# can proceed, so we bail on our attempt.
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try:
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process_namespace = ctypes.CDLL(None)
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except OSError:
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return None
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try:
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gnu_get_libc_version = process_namespace.gnu_get_libc_version
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except AttributeError:
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# Symbol doesn't exist -> therefore, we are not linked to
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# glibc.
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return None
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# Call gnu_get_libc_version, which returns a string like "2.5"
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gnu_get_libc_version.restype = ctypes.c_char_p
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version_str: str = gnu_get_libc_version()
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# py2 / py3 compatibility:
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if not isinstance(version_str, str):
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version_str = version_str.decode("ascii")
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return version_str
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def _glibc_version_string() -> Optional[str]:
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"""Returns glibc version string, or None if not using glibc."""
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return _glibc_version_string_confstr() or _glibc_version_string_ctypes()
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def _parse_glibc_version(version_str: str) -> Tuple[int, int]:
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"""Parse glibc version.
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We use a regexp instead of str.split because we want to discard any
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random junk that might come after the minor version -- this might happen
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in patched/forked versions of glibc (e.g. Linaro's version of glibc
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uses version strings like "2.20-2014.11"). See gh-3588.
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"""
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m = re.match(r"(?P<major>[0-9]+)\.(?P<minor>[0-9]+)", version_str)
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if not m:
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warnings.warn(
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"Expected glibc version with 2 components major.minor,"
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" got: %s" % version_str,
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RuntimeWarning,
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)
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return -1, -1
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return int(m.group("major")), int(m.group("minor"))
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@functools.lru_cache()
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def _get_glibc_version() -> Tuple[int, int]:
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version_str = _glibc_version_string()
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if version_str is None:
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return (-1, -1)
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return _parse_glibc_version(version_str)
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# From PEP 513, PEP 600
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def _is_compatible(name: str, arch: str, version: _GLibCVersion) -> bool:
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sys_glibc = _get_glibc_version()
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if sys_glibc < version:
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return False
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# Check for presence of _manylinux module.
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try:
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import _manylinux # noqa
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except ImportError:
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return True
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if hasattr(_manylinux, "manylinux_compatible"):
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result = _manylinux.manylinux_compatible(version[0], version[1], arch)
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if result is not None:
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return bool(result)
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return True
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if version == _GLibCVersion(2, 5):
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if hasattr(_manylinux, "manylinux1_compatible"):
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return bool(_manylinux.manylinux1_compatible)
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if version == _GLibCVersion(2, 12):
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if hasattr(_manylinux, "manylinux2010_compatible"):
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return bool(_manylinux.manylinux2010_compatible)
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if version == _GLibCVersion(2, 17):
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if hasattr(_manylinux, "manylinux2014_compatible"):
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return bool(_manylinux.manylinux2014_compatible)
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return True
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_LEGACY_MANYLINUX_MAP = {
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# CentOS 7 w/ glibc 2.17 (PEP 599)
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(2, 17): "manylinux2014",
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# CentOS 6 w/ glibc 2.12 (PEP 571)
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(2, 12): "manylinux2010",
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# CentOS 5 w/ glibc 2.5 (PEP 513)
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(2, 5): "manylinux1",
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}
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def platform_tags(linux: str, arch: str) -> Iterator[str]:
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if not _have_compatible_abi(arch):
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return
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# Oldest glibc to be supported regardless of architecture is (2, 17).
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too_old_glibc2 = _GLibCVersion(2, 16)
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if arch in {"x86_64", "i686"}:
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# On x86/i686 also oldest glibc to be supported is (2, 5).
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too_old_glibc2 = _GLibCVersion(2, 4)
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current_glibc = _GLibCVersion(*_get_glibc_version())
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glibc_max_list = [current_glibc]
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# We can assume compatibility across glibc major versions.
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# https://sourceware.org/bugzilla/show_bug.cgi?id=24636
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#
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# Build a list of maximum glibc versions so that we can
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# output the canonical list of all glibc from current_glibc
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# down to too_old_glibc2, including all intermediary versions.
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for glibc_major in range(current_glibc.major - 1, 1, -1):
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glibc_minor = _LAST_GLIBC_MINOR[glibc_major]
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glibc_max_list.append(_GLibCVersion(glibc_major, glibc_minor))
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for glibc_max in glibc_max_list:
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if glibc_max.major == too_old_glibc2.major:
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min_minor = too_old_glibc2.minor
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else:
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# For other glibc major versions oldest supported is (x, 0).
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min_minor = -1
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for glibc_minor in range(glibc_max.minor, min_minor, -1):
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glibc_version = _GLibCVersion(glibc_max.major, glibc_minor)
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tag = "manylinux_{}_{}".format(*glibc_version)
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if _is_compatible(tag, arch, glibc_version):
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yield linux.replace("linux", tag)
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# Handle the legacy manylinux1, manylinux2010, manylinux2014 tags.
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if glibc_version in _LEGACY_MANYLINUX_MAP:
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legacy_tag = _LEGACY_MANYLINUX_MAP[glibc_version]
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if _is_compatible(legacy_tag, arch, glibc_version):
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yield linux.replace("linux", legacy_tag)
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