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annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/glibc.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 from __future__ import absolute_import
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2
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3 import os
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4 import re
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5 import warnings
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6
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7 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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8
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9 if MYPY_CHECK_RUNNING:
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10 from typing import Optional, Tuple
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11
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12
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13 def glibc_version_string():
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14 # type: () -> Optional[str]
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15 "Returns glibc version string, or None if not using glibc."
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16 return glibc_version_string_confstr() or glibc_version_string_ctypes()
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17
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18
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19 def glibc_version_string_confstr():
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20 # type: () -> Optional[str]
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21 "Primary implementation of glibc_version_string using os.confstr."
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22 # os.confstr is quite a bit faster than ctypes.DLL. It's also less likely
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23 # to be broken or missing. This strategy is used in the standard library
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24 # platform module:
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25 # https://github.com/python/cpython/blob/fcf1d003bf4f0100c9d0921ff3d70e1127ca1b71/Lib/platform.py#L175-L183
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26 try:
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27 # os.confstr("CS_GNU_LIBC_VERSION") returns a string like "glibc 2.17":
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28 _, version = os.confstr("CS_GNU_LIBC_VERSION").split()
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29 except (AttributeError, OSError, ValueError):
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30 # os.confstr() or CS_GNU_LIBC_VERSION not available (or a bad value)...
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31 return None
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32 return version
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33
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34
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35 def glibc_version_string_ctypes():
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36 # type: () -> Optional[str]
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37 "Fallback implementation of glibc_version_string using ctypes."
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38
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39 try:
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40 import ctypes
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41 except ImportError:
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42 return None
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43
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44 # ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen
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45 # manpage says, "If filename is NULL, then the returned handle is for the
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46 # main program". This way we can let the linker do the work to figure out
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47 # which libc our process is actually using.
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48 process_namespace = ctypes.CDLL(None)
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49 try:
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50 gnu_get_libc_version = process_namespace.gnu_get_libc_version
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51 except AttributeError:
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52 # Symbol doesn't exist -> therefore, we are not linked to
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53 # glibc.
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54 return None
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55
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56 # Call gnu_get_libc_version, which returns a string like "2.5"
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57 gnu_get_libc_version.restype = ctypes.c_char_p
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58 version_str = gnu_get_libc_version()
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59 # py2 / py3 compatibility:
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60 if not isinstance(version_str, str):
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61 version_str = version_str.decode("ascii")
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62
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63 return version_str
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64
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65
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66 # Separated out from have_compatible_glibc for easier unit testing
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67 def check_glibc_version(version_str, required_major, minimum_minor):
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68 # type: (str, int, int) -> bool
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69 # Parse string and check against requested version.
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70 #
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71 # We use a regexp instead of str.split because we want to discard any
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72 # random junk that might come after the minor version -- this might happen
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73 # in patched/forked versions of glibc (e.g. Linaro's version of glibc
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74 # uses version strings like "2.20-2014.11"). See gh-3588.
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75 m = re.match(r"(?P<major>[0-9]+)\.(?P<minor>[0-9]+)", version_str)
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76 if not m:
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77 warnings.warn("Expected glibc version with 2 components major.minor,"
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78 " got: %s" % version_str, RuntimeWarning)
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79 return False
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80 return (int(m.group("major")) == required_major and
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81 int(m.group("minor")) >= minimum_minor)
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82
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83
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84 def have_compatible_glibc(required_major, minimum_minor):
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85 # type: (int, int) -> bool
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86 version_str = glibc_version_string()
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87 if version_str is None:
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88 return False
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89 return check_glibc_version(version_str, required_major, minimum_minor)
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90
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91
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92 # platform.libc_ver regularly returns completely nonsensical glibc
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93 # versions. E.g. on my computer, platform says:
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94 #
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95 # ~$ python2.7 -c 'import platform; print(platform.libc_ver())'
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96 # ('glibc', '2.7')
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97 # ~$ python3.5 -c 'import platform; print(platform.libc_ver())'
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98 # ('glibc', '2.9')
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99 #
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100 # But the truth is:
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101 #
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102 # ~$ ldd --version
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103 # ldd (Debian GLIBC 2.22-11) 2.22
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104 #
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105 # This is unfortunate, because it means that the linehaul data on libc
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106 # versions that was generated by pip 8.1.2 and earlier is useless and
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107 # misleading. Solution: instead of using platform, use our code that actually
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108 # works.
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109 def libc_ver():
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110 # type: () -> Tuple[str, str]
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111 """Try to determine the glibc version
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112
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113 Returns a tuple of strings (lib, version) which default to empty strings
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114 in case the lookup fails.
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115 """
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116 glibc_version = glibc_version_string()
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117 if glibc_version is None:
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118 return ("", "")
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119 else:
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120 return ("glibc", glibc_version)