| # This file originally from pip: |
| # https://github.com/pypa/pip/blob/8f4f15a5a95d7d5b511ceaee9ed261176c181970/src/pip/_internal/utils/glibc.py |
| from __future__ import absolute_import |
| |
| import ctypes |
| import re |
| 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(): |
| """Try to determine the glibc version |
| |
| Returns a tuple of strings (lib, version) which default to empty strings |
| in case the lookup fails. |
| """ |
| glibc_version = glibc_version_string() |
| if glibc_version is None: |
| return ("", "") |
| else: |
| return ("glibc", glibc_version) |