forked from s434596/CatOrNot
82 lines
2.9 KiB
Python
82 lines
2.9 KiB
Python
from __future__ import absolute_import
|
|
|
|
import re
|
|
import ctypes
|
|
import platform
|
|
import warnings
|
|
|
|
|
|
def glibc_version_string():
|
|
"Returns glibc version string, or None if not using glibc."
|
|
|
|
# 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.
|
|
process_namespace = ctypes.CDLL(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 = gnu_get_libc_version()
|
|
# py2 / py3 compatibility:
|
|
if not isinstance(version_str, str):
|
|
version_str = version_str.decode("ascii")
|
|
|
|
return version_str
|
|
|
|
|
|
# Separated out from have_compatible_glibc for easier unit testing
|
|
def check_glibc_version(version_str, required_major, minimum_minor):
|
|
# Parse string and check against requested 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 False
|
|
return (int(m.group("major")) == required_major and
|
|
int(m.group("minor")) >= minimum_minor)
|
|
|
|
|
|
def have_compatible_glibc(required_major, minimum_minor):
|
|
version_str = glibc_version_string()
|
|
if version_str is None:
|
|
return False
|
|
return check_glibc_version(version_str, required_major, minimum_minor)
|
|
|
|
|
|
# platform.libc_ver regularly returns completely nonsensical glibc
|
|
# versions. E.g. on my computer, platform says:
|
|
#
|
|
# ~$ python2.7 -c 'import platform; print(platform.libc_ver())'
|
|
# ('glibc', '2.7')
|
|
# ~$ python3.5 -c 'import platform; print(platform.libc_ver())'
|
|
# ('glibc', '2.9')
|
|
#
|
|
# But the truth is:
|
|
#
|
|
# ~$ ldd --version
|
|
# ldd (Debian GLIBC 2.22-11) 2.22
|
|
#
|
|
# This is unfortunate, because it means that the linehaul data on libc
|
|
# versions that was generated by pip 8.1.2 and earlier is useless and
|
|
# misleading. Solution: instead of using platform, use our code that actually
|
|
# works.
|
|
def libc_ver():
|
|
glibc_version = glibc_version_string()
|
|
if glibc_version is None:
|
|
# For non-glibc platforms, fall back on platform.libc_ver
|
|
return platform.libc_ver()
|
|
else:
|
|
return ("glibc", glibc_version)
|