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92 lines
3.1 KiB
92 lines
3.1 KiB
# The following comment should be removed at some point in the future. |
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# mypy: strict-optional=False |
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import os |
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import sys |
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from typing import Optional, Tuple |
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def glibc_version_string(): |
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# type: () -> 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 glibc_version_string_confstr(): |
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# type: () -> Optional[str] |
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"Primary implementation of glibc_version_string using os.confstr." |
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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/fcf1d003bf4f0100c9d0921ff3d70e1127ca1b71/Lib/platform.py#L175-L183 |
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if sys.platform == "win32": |
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return None |
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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 = os.confstr("CS_GNU_LIBC_VERSION").split() |
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except (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(): |
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# type: () -> Optional[str] |
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"Fallback implementation of glibc_version_string using ctypes." |
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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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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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# 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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# type: () -> Tuple[str, str] |
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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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