annotate lib/python3.8/site-packages/pip/_internal/operations/check.py @ 0:9e54283cc701 draft

"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 """Validation of dependencies of packages
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2 """
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3
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4 # The following comment should be removed at some point in the future.
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5 # mypy: strict-optional=False
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6 # mypy: disallow-untyped-defs=False
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7
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8 import logging
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9 from collections import namedtuple
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10
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11 from pip._vendor.packaging.utils import canonicalize_name
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12 from pip._vendor.pkg_resources import RequirementParseError
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13
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14 from pip._internal.distributions import (
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15 make_distribution_for_install_requirement,
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16 )
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17 from pip._internal.utils.misc import get_installed_distributions
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18 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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19
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20 logger = logging.getLogger(__name__)
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21
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22 if MYPY_CHECK_RUNNING:
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23 from pip._internal.req.req_install import InstallRequirement
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24 from typing import (
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25 Any, Callable, Dict, Optional, Set, Tuple, List
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26 )
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27
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28 # Shorthands
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29 PackageSet = Dict[str, 'PackageDetails']
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30 Missing = Tuple[str, Any]
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31 Conflicting = Tuple[str, str, Any]
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32
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33 MissingDict = Dict[str, List[Missing]]
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34 ConflictingDict = Dict[str, List[Conflicting]]
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35 CheckResult = Tuple[MissingDict, ConflictingDict]
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36
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37 PackageDetails = namedtuple('PackageDetails', ['version', 'requires'])
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38
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39
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40 def create_package_set_from_installed(**kwargs):
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41 # type: (**Any) -> Tuple[PackageSet, bool]
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42 """Converts a list of distributions into a PackageSet.
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43 """
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44 # Default to using all packages installed on the system
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45 if kwargs == {}:
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46 kwargs = {"local_only": False, "skip": ()}
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47
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48 package_set = {}
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49 problems = False
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50 for dist in get_installed_distributions(**kwargs):
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51 name = canonicalize_name(dist.project_name)
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52 try:
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53 package_set[name] = PackageDetails(dist.version, dist.requires())
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54 except RequirementParseError as e:
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55 # Don't crash on broken metadata
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56 logger.warning("Error parsing requirements for %s: %s", name, e)
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57 problems = True
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58 return package_set, problems
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59
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60
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61 def check_package_set(package_set, should_ignore=None):
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62 # type: (PackageSet, Optional[Callable[[str], bool]]) -> CheckResult
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63 """Check if a package set is consistent
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64
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65 If should_ignore is passed, it should be a callable that takes a
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66 package name and returns a boolean.
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67 """
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68 if should_ignore is None:
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69 def should_ignore(name):
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70 return False
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71
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72 missing = {}
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73 conflicting = {}
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74
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75 for package_name in package_set:
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76 # Info about dependencies of package_name
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77 missing_deps = set() # type: Set[Missing]
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78 conflicting_deps = set() # type: Set[Conflicting]
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79
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80 if should_ignore(package_name):
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81 continue
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82
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83 for req in package_set[package_name].requires:
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84 name = canonicalize_name(req.project_name) # type: str
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85
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86 # Check if it's missing
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87 if name not in package_set:
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88 missed = True
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89 if req.marker is not None:
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90 missed = req.marker.evaluate()
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91 if missed:
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92 missing_deps.add((name, req))
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93 continue
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94
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95 # Check if there's a conflict
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96 version = package_set[name].version # type: str
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97 if not req.specifier.contains(version, prereleases=True):
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98 conflicting_deps.add((name, version, req))
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99
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100 if missing_deps:
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101 missing[package_name] = sorted(missing_deps, key=str)
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102 if conflicting_deps:
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103 conflicting[package_name] = sorted(conflicting_deps, key=str)
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104
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105 return missing, conflicting
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106
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107
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108 def check_install_conflicts(to_install):
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109 # type: (List[InstallRequirement]) -> Tuple[PackageSet, CheckResult]
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110 """For checking if the dependency graph would be consistent after \
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111 installing given requirements
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112 """
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113 # Start from the current state
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114 package_set, _ = create_package_set_from_installed()
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115 # Install packages
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116 would_be_installed = _simulate_installation_of(to_install, package_set)
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117
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118 # Only warn about directly-dependent packages; create a whitelist of them
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119 whitelist = _create_whitelist(would_be_installed, package_set)
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120
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121 return (
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122 package_set,
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123 check_package_set(
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124 package_set, should_ignore=lambda name: name not in whitelist
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125 )
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126 )
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127
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128
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129 def _simulate_installation_of(to_install, package_set):
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130 # type: (List[InstallRequirement], PackageSet) -> Set[str]
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131 """Computes the version of packages after installing to_install.
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132 """
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133
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134 # Keep track of packages that were installed
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135 installed = set()
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136
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137 # Modify it as installing requirement_set would (assuming no errors)
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138 for inst_req in to_install:
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139 abstract_dist = make_distribution_for_install_requirement(inst_req)
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140 dist = abstract_dist.get_pkg_resources_distribution()
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141
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142 name = canonicalize_name(dist.key)
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143 package_set[name] = PackageDetails(dist.version, dist.requires())
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144
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145 installed.add(name)
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146
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147 return installed
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148
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149
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150 def _create_whitelist(would_be_installed, package_set):
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151 # type: (Set[str], PackageSet) -> Set[str]
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152 packages_affected = set(would_be_installed)
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153
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154 for package_name in package_set:
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155 if package_name in packages_affected:
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156 continue
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157
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158 for req in package_set[package_name].requires:
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159 if canonicalize_name(req.name) in packages_affected:
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160 packages_affected.add(package_name)
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161 break
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162
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163 return packages_affected