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comparison 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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0:d30785e31577 1:56ad4e20f292
1 # This file originally from pip:
2 # https://github.com/pypa/pip/blob/8f4f15a5a95d7d5b511ceaee9ed261176c181970/src/pip/_internal/utils/glibc.py
3 from __future__ import absolute_import
4
5 import ctypes
6 import re
7 import warnings
8
9
10 def glibc_version_string():
11 "Returns glibc version string, or None if not using glibc."
12
13 # ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen
14 # manpage says, "If filename is NULL, then the returned handle is for the
15 # main program". This way we can let the linker do the work to figure out
16 # which libc our process is actually using.
17 process_namespace = ctypes.CDLL(None)
18 try:
19 gnu_get_libc_version = process_namespace.gnu_get_libc_version
20 except AttributeError:
21 # Symbol doesn't exist -> therefore, we are not linked to
22 # glibc.
23 return None
24
25 # Call gnu_get_libc_version, which returns a string like "2.5"
26 gnu_get_libc_version.restype = ctypes.c_char_p
27 version_str = gnu_get_libc_version()
28 # py2 / py3 compatibility:
29 if not isinstance(version_str, str):
30 version_str = version_str.decode("ascii")
31
32 return version_str
33
34
35 # Separated out from have_compatible_glibc for easier unit testing
36 def check_glibc_version(version_str, required_major, minimum_minor):
37 # Parse string and check against requested version.
38 #
39 # We use a regexp instead of str.split because we want to discard any
40 # random junk that might come after the minor version -- this might happen
41 # in patched/forked versions of glibc (e.g. Linaro's version of glibc
42 # uses version strings like "2.20-2014.11"). See gh-3588.
43 m = re.match(r"(?P<major>[0-9]+)\.(?P<minor>[0-9]+)", version_str)
44 if not m:
45 warnings.warn("Expected glibc version with 2 components major.minor,"
46 " got: %s" % version_str, RuntimeWarning)
47 return False
48 return (int(m.group("major")) == required_major and
49 int(m.group("minor")) >= minimum_minor)
50
51
52 def have_compatible_glibc(required_major, minimum_minor):
53 version_str = glibc_version_string()
54 if version_str is None:
55 return False
56 return check_glibc_version(version_str, required_major, minimum_minor)
57
58
59 # platform.libc_ver regularly returns completely nonsensical glibc
60 # versions. E.g. on my computer, platform says:
61 #
62 # ~$ python2.7 -c 'import platform; print(platform.libc_ver())'
63 # ('glibc', '2.7')
64 # ~$ python3.5 -c 'import platform; print(platform.libc_ver())'
65 # ('glibc', '2.9')
66 #
67 # But the truth is:
68 #
69 # ~$ ldd --version
70 # ldd (Debian GLIBC 2.22-11) 2.22
71 #
72 # This is unfortunate, because it means that the linehaul data on libc
73 # versions that was generated by pip 8.1.2 and earlier is useless and
74 # misleading. Solution: instead of using platform, use our code that actually
75 # works.
76 def libc_ver():
77 """Try to determine the glibc version
78
79 Returns a tuple of strings (lib, version) which default to empty strings
80 in case the lookup fails.
81 """
82 glibc_version = glibc_version_string()
83 if glibc_version is None:
84 return ("", "")
85 else:
86 return ("glibc", glibc_version)