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annotate planemo/lib/python3.7/site-packages/setuptools/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 # This file originally from pip:
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2 # https://github.com/pypa/pip/blob/8f4f15a5a95d7d5b511ceaee9ed261176c181970/src/pip/_internal/utils/glibc.py
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3 from __future__ import absolute_import
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4
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5 import ctypes
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6 import re
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7 import warnings
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8
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9
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10 def glibc_version_string():
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11 "Returns glibc version string, or None if not using glibc."
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12
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13 # ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen
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14 # manpage says, "If filename is NULL, then the returned handle is for the
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15 # main program". This way we can let the linker do the work to figure out
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16 # which libc our process is actually using.
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17 process_namespace = ctypes.CDLL(None)
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18 try:
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19 gnu_get_libc_version = process_namespace.gnu_get_libc_version
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20 except AttributeError:
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21 # Symbol doesn't exist -> therefore, we are not linked to
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22 # glibc.
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23 return None
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24
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25 # Call gnu_get_libc_version, which returns a string like "2.5"
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26 gnu_get_libc_version.restype = ctypes.c_char_p
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27 version_str = gnu_get_libc_version()
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28 # py2 / py3 compatibility:
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29 if not isinstance(version_str, str):
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30 version_str = version_str.decode("ascii")
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31
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32 return version_str
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33
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34
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35 # Separated out from have_compatible_glibc for easier unit testing
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36 def check_glibc_version(version_str, required_major, minimum_minor):
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37 # Parse string and check against requested version.
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38 #
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39 # We use a regexp instead of str.split because we want to discard any
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40 # random junk that might come after the minor version -- this might happen
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41 # in patched/forked versions of glibc (e.g. Linaro's version of glibc
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42 # uses version strings like "2.20-2014.11"). See gh-3588.
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43 m = re.match(r"(?P<major>[0-9]+)\.(?P<minor>[0-9]+)", version_str)
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44 if not m:
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45 warnings.warn("Expected glibc version with 2 components major.minor,"
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46 " got: %s" % version_str, RuntimeWarning)
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47 return False
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48 return (int(m.group("major")) == required_major and
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49 int(m.group("minor")) >= minimum_minor)
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50
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51
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52 def have_compatible_glibc(required_major, minimum_minor):
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53 version_str = glibc_version_string()
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54 if version_str is None:
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55 return False
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56 return check_glibc_version(version_str, required_major, minimum_minor)
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57
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58
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59 # platform.libc_ver regularly returns completely nonsensical glibc
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60 # versions. E.g. on my computer, platform says:
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61 #
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62 # ~$ python2.7 -c 'import platform; print(platform.libc_ver())'
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63 # ('glibc', '2.7')
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64 # ~$ python3.5 -c 'import platform; print(platform.libc_ver())'
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65 # ('glibc', '2.9')
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66 #
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67 # But the truth is:
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68 #
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69 # ~$ ldd --version
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70 # ldd (Debian GLIBC 2.22-11) 2.22
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71 #
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72 # This is unfortunate, because it means that the linehaul data on libc
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73 # versions that was generated by pip 8.1.2 and earlier is useless and
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74 # misleading. Solution: instead of using platform, use our code that actually
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75 # works.
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76 def libc_ver():
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77 """Try to determine the glibc version
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78
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79 Returns a tuple of strings (lib, version) which default to empty strings
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80 in case the lookup fails.
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81 """
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82 glibc_version = glibc_version_string()
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83 if glibc_version is None:
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84 return ("", "")
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85 else:
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86 return ("glibc", glibc_version)