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annotate lib/python3.8/site-packages/pip/_internal/utils/virtualenv.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 from __future__ import absolute_import
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2
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3 import logging
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4 import os
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5 import re
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6 import site
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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 List, Optional
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13
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14 logger = logging.getLogger(__name__)
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15 _INCLUDE_SYSTEM_SITE_PACKAGES_REGEX = re.compile(
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16 r"include-system-site-packages\s*=\s*(?P<value>true|false)"
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17 )
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19
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20 def _running_under_venv():
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21 # type: () -> bool
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22 """Checks if sys.base_prefix and sys.prefix match.
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23
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24 This handles PEP 405 compliant virtual environments.
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25 """
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26 return sys.prefix != getattr(sys, "base_prefix", sys.prefix)
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28
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29 def _running_under_regular_virtualenv():
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30 # type: () -> bool
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31 """Checks if sys.real_prefix is set.
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32
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33 This handles virtual environments created with pypa's virtualenv.
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34 """
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35 # pypa/virtualenv case
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36 return hasattr(sys, 'real_prefix')
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37
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38
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39 def running_under_virtualenv():
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40 # type: () -> bool
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41 """Return True if we're running inside a virtualenv, False otherwise.
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42 """
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43 return _running_under_venv() or _running_under_regular_virtualenv()
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44
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45
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46 def _get_pyvenv_cfg_lines():
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47 # type: () -> Optional[List[str]]
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48 """Reads {sys.prefix}/pyvenv.cfg and returns its contents as list of lines
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49
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50 Returns None, if it could not read/access the file.
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51 """
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52 pyvenv_cfg_file = os.path.join(sys.prefix, 'pyvenv.cfg')
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53 try:
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54 with open(pyvenv_cfg_file) as f:
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55 return f.read().splitlines() # avoids trailing newlines
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56 except IOError:
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57 return None
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58
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59
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60 def _no_global_under_venv():
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61 # type: () -> bool
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62 """Check `{sys.prefix}/pyvenv.cfg` for system site-packages inclusion
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63
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64 PEP 405 specifies that when system site-packages are not supposed to be
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65 visible from a virtual environment, `pyvenv.cfg` must contain the following
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66 line:
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67
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68 include-system-site-packages = false
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69
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70 Additionally, log a warning if accessing the file fails.
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71 """
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72 cfg_lines = _get_pyvenv_cfg_lines()
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73 if cfg_lines is None:
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74 # We're not in a "sane" venv, so assume there is no system
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75 # site-packages access (since that's PEP 405's default state).
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76 logger.warning(
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77 "Could not access 'pyvenv.cfg' despite a virtual environment "
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78 "being active. Assuming global site-packages is not accessible "
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79 "in this environment."
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80 )
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81 return True
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82
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83 for line in cfg_lines:
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84 match = _INCLUDE_SYSTEM_SITE_PACKAGES_REGEX.match(line)
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85 if match is not None and match.group('value') == 'false':
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86 return True
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87 return False
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88
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89
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90 def _no_global_under_regular_virtualenv():
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91 # type: () -> bool
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92 """Check if "no-global-site-packages.txt" exists beside site.py
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93
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94 This mirrors logic in pypa/virtualenv for determining whether system
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95 site-packages are visible in the virtual environment.
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96 """
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97 site_mod_dir = os.path.dirname(os.path.abspath(site.__file__))
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98 no_global_site_packages_file = os.path.join(
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99 site_mod_dir, 'no-global-site-packages.txt',
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100 )
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101 return os.path.exists(no_global_site_packages_file)
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102
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103
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104 def virtualenv_no_global():
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105 # type: () -> bool
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106 """Returns a boolean, whether running in venv with no system site-packages.
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107 """
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108
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109 if _running_under_regular_virtualenv():
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110 return _no_global_under_regular_virtualenv()
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111
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112 if _running_under_venv():
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113 return _no_global_under_venv()
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114
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115 return False