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annotate lib/python3.8/site-packages/pip/_internal/utils/glibc.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 # The following comment should be removed at some point in the future.
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2 # mypy: strict-optional=False
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3
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4 from __future__ import absolute_import
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5
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6 import os
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7 import sys
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8
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9 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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10
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11 if MYPY_CHECK_RUNNING:
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12 from typing import Optional, Tuple
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13
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14
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15 def glibc_version_string():
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16 # type: () -> Optional[str]
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17 "Returns glibc version string, or None if not using glibc."
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18 return glibc_version_string_confstr() or glibc_version_string_ctypes()
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19
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20
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21 def glibc_version_string_confstr():
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22 # type: () -> Optional[str]
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23 "Primary implementation of glibc_version_string using os.confstr."
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24 # os.confstr is quite a bit faster than ctypes.DLL. It's also less likely
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25 # to be broken or missing. This strategy is used in the standard library
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26 # platform module:
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27 # https://github.com/python/cpython/blob/fcf1d003bf4f0100c9d0921ff3d70e1127ca1b71/Lib/platform.py#L175-L183
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28 if sys.platform == "win32":
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29 return None
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30 try:
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31 # os.confstr("CS_GNU_LIBC_VERSION") returns a string like "glibc 2.17":
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32 _, version = os.confstr("CS_GNU_LIBC_VERSION").split()
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33 except (AttributeError, OSError, ValueError):
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34 # os.confstr() or CS_GNU_LIBC_VERSION not available (or a bad value)...
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35 return None
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36 return version
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37
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38
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39 def glibc_version_string_ctypes():
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40 # type: () -> Optional[str]
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41 "Fallback implementation of glibc_version_string using ctypes."
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42
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43 try:
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44 import ctypes
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45 except ImportError:
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46 return None
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47
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48 # ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen
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49 # manpage says, "If filename is NULL, then the returned handle is for the
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50 # main program". This way we can let the linker do the work to figure out
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51 # which libc our process is actually using.
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52 process_namespace = ctypes.CDLL(None)
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53 try:
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54 gnu_get_libc_version = process_namespace.gnu_get_libc_version
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55 except AttributeError:
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56 # Symbol doesn't exist -> therefore, we are not linked to
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57 # glibc.
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58 return None
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59
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60 # Call gnu_get_libc_version, which returns a string like "2.5"
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61 gnu_get_libc_version.restype = ctypes.c_char_p
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62 version_str = gnu_get_libc_version()
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63 # py2 / py3 compatibility:
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64 if not isinstance(version_str, str):
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65 version_str = version_str.decode("ascii")
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66
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67 return version_str
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68
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69
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70 # platform.libc_ver regularly returns completely nonsensical glibc
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71 # versions. E.g. on my computer, platform says:
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72 #
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73 # ~$ python2.7 -c 'import platform; print(platform.libc_ver())'
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74 # ('glibc', '2.7')
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75 # ~$ python3.5 -c 'import platform; print(platform.libc_ver())'
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76 # ('glibc', '2.9')
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77 #
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78 # But the truth is:
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79 #
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80 # ~$ ldd --version
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81 # ldd (Debian GLIBC 2.22-11) 2.22
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82 #
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83 # This is unfortunate, because it means that the linehaul data on libc
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84 # versions that was generated by pip 8.1.2 and earlier is useless and
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85 # misleading. Solution: instead of using platform, use our code that actually
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86 # works.
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87 def libc_ver():
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88 # type: () -> Tuple[str, str]
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89 """Try to determine the glibc version
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90
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91 Returns a tuple of strings (lib, version) which default to empty strings
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92 in case the lookup fails.
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93 """
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94 glibc_version = glibc_version_string()
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95 if glibc_version is None:
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96 return ("", "")
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97 else:
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98 return ("glibc", glibc_version)