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annotate planemo/lib/python3.7/site-packages/pip/_internal/pyproject.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 io
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4 import os
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5 import sys
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6
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7 from pip._vendor import pytoml, six
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8
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9 from pip._internal.exceptions import InstallationError
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10 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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11
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12 if MYPY_CHECK_RUNNING:
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13 from typing import Any, Tuple, Optional, List
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14
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15
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16 def _is_list_of_str(obj):
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17 # type: (Any) -> bool
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18 return (
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19 isinstance(obj, list) and
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20 all(isinstance(item, six.string_types) for item in obj)
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21 )
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22
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23
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24 def make_pyproject_path(setup_py_dir):
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25 # type: (str) -> str
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26 path = os.path.join(setup_py_dir, 'pyproject.toml')
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27
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28 # Python2 __file__ should not be unicode
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29 if six.PY2 and isinstance(path, six.text_type):
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30 path = path.encode(sys.getfilesystemencoding())
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31
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32 return path
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33
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34
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35 def load_pyproject_toml(
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36 use_pep517, # type: Optional[bool]
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37 pyproject_toml, # type: str
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38 setup_py, # type: str
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39 req_name # type: str
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40 ):
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41 # type: (...) -> Optional[Tuple[List[str], str, List[str]]]
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42 """Load the pyproject.toml file.
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43
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44 Parameters:
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45 use_pep517 - Has the user requested PEP 517 processing? None
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46 means the user hasn't explicitly specified.
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47 pyproject_toml - Location of the project's pyproject.toml file
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48 setup_py - Location of the project's setup.py file
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49 req_name - The name of the requirement we're processing (for
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50 error reporting)
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51
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52 Returns:
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53 None if we should use the legacy code path, otherwise a tuple
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54 (
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55 requirements from pyproject.toml,
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56 name of PEP 517 backend,
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57 requirements we should check are installed after setting
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58 up the build environment
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59 )
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60 """
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61 has_pyproject = os.path.isfile(pyproject_toml)
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62 has_setup = os.path.isfile(setup_py)
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63
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64 if has_pyproject:
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65 with io.open(pyproject_toml, encoding="utf-8") as f:
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66 pp_toml = pytoml.load(f)
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67 build_system = pp_toml.get("build-system")
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68 else:
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69 build_system = None
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70
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71 # The following cases must use PEP 517
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72 # We check for use_pep517 being non-None and falsey because that means
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73 # the user explicitly requested --no-use-pep517. The value 0 as
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74 # opposed to False can occur when the value is provided via an
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75 # environment variable or config file option (due to the quirk of
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76 # strtobool() returning an integer in pip's configuration code).
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77 if has_pyproject and not has_setup:
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78 if use_pep517 is not None and not use_pep517:
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79 raise InstallationError(
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80 "Disabling PEP 517 processing is invalid: "
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81 "project does not have a setup.py"
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82 )
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83 use_pep517 = True
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84 elif build_system and "build-backend" in build_system:
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85 if use_pep517 is not None and not use_pep517:
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86 raise InstallationError(
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87 "Disabling PEP 517 processing is invalid: "
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88 "project specifies a build backend of {} "
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89 "in pyproject.toml".format(
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90 build_system["build-backend"]
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91 )
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92 )
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93 use_pep517 = True
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94
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95 # If we haven't worked out whether to use PEP 517 yet,
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96 # and the user hasn't explicitly stated a preference,
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97 # we do so if the project has a pyproject.toml file.
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98 elif use_pep517 is None:
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99 use_pep517 = has_pyproject
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100
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101 # At this point, we know whether we're going to use PEP 517.
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102 assert use_pep517 is not None
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103
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104 # If we're using the legacy code path, there is nothing further
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105 # for us to do here.
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106 if not use_pep517:
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107 return None
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108
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109 if build_system is None:
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110 # Either the user has a pyproject.toml with no build-system
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111 # section, or the user has no pyproject.toml, but has opted in
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112 # explicitly via --use-pep517.
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113 # In the absence of any explicit backend specification, we
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114 # assume the setuptools backend that most closely emulates the
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115 # traditional direct setup.py execution, and require wheel and
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116 # a version of setuptools that supports that backend.
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117
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118 build_system = {
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119 "requires": ["setuptools>=40.8.0", "wheel"],
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120 "build-backend": "setuptools.build_meta:__legacy__",
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121 }
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122
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123 # If we're using PEP 517, we have build system information (either
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124 # from pyproject.toml, or defaulted by the code above).
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125 # Note that at this point, we do not know if the user has actually
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126 # specified a backend, though.
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127 assert build_system is not None
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128
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129 # Ensure that the build-system section in pyproject.toml conforms
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130 # to PEP 518.
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131 error_template = (
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132 "{package} has a pyproject.toml file that does not comply "
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133 "with PEP 518: {reason}"
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134 )
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135
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136 # Specifying the build-system table but not the requires key is invalid
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137 if "requires" not in build_system:
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138 raise InstallationError(
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139 error_template.format(package=req_name, reason=(
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140 "it has a 'build-system' table but not "
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141 "'build-system.requires' which is mandatory in the table"
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142 ))
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143 )
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144
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145 # Error out if requires is not a list of strings
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146 requires = build_system["requires"]
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147 if not _is_list_of_str(requires):
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148 raise InstallationError(error_template.format(
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149 package=req_name,
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150 reason="'build-system.requires' is not a list of strings.",
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151 ))
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152
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153 backend = build_system.get("build-backend")
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154 check = [] # type: List[str]
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155 if backend is None:
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156 # If the user didn't specify a backend, we assume they want to use
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157 # the setuptools backend. But we can't be sure they have included
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158 # a version of setuptools which supplies the backend, or wheel
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159 # (which is needed by the backend) in their requirements. So we
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160 # make a note to check that those requirements are present once
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161 # we have set up the environment.
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162 # This is quite a lot of work to check for a very specific case. But
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163 # the problem is, that case is potentially quite common - projects that
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164 # adopted PEP 518 early for the ability to specify requirements to
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165 # execute setup.py, but never considered needing to mention the build
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166 # tools themselves. The original PEP 518 code had a similar check (but
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167 # implemented in a different way).
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168 backend = "setuptools.build_meta:__legacy__"
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169 check = ["setuptools>=40.8.0", "wheel"]
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170
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171 return (requires, backend, check)