85 lines
3.0 KiB
Python
85 lines
3.0 KiB
Python
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from __future__ import absolute_import
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import ctypes
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import re
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import warnings
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def glibc_version_string():
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"Returns glibc version string, or None if not using glibc."
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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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process_namespace = ctypes.CDLL(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 = 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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# Separated out from have_compatible_glibc for easier unit testing
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def check_glibc_version(version_str, required_major, minimum_minor):
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# Parse string and check against requested version.
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#
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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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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("Expected glibc version with 2 components major.minor,"
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" got: %s" % version_str, RuntimeWarning)
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return False
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return (int(m.group("major")) == required_major and
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int(m.group("minor")) >= minimum_minor)
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def have_compatible_glibc(required_major, minimum_minor):
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version_str = glibc_version_string()
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if version_str is None:
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return False
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return check_glibc_version(version_str, required_major, minimum_minor)
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# platform.libc_ver regularly returns completely nonsensical glibc
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# versions. E.g. on my computer, platform says:
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#
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# ~$ python2.7 -c 'import platform; print(platform.libc_ver())'
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# ('glibc', '2.7')
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# ~$ python3.5 -c 'import platform; print(platform.libc_ver())'
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# ('glibc', '2.9')
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#
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# But the truth is:
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#
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# ~$ ldd --version
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# ldd (Debian GLIBC 2.22-11) 2.22
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#
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# This is unfortunate, because it means that the linehaul data on libc
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# versions that was generated by pip 8.1.2 and earlier is useless and
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# misleading. Solution: instead of using platform, use our code that actually
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# works.
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def libc_ver():
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"""Try to determine the glibc version
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Returns a tuple of strings (lib, version) which default to empty strings
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in case the lookup fails.
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"""
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glibc_version = glibc_version_string()
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if glibc_version is None:
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return ("", "")
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else:
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return ("glibc", glibc_version)
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