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annotate lib/python3.8/site-packages/pip/_internal/req/req_tracker.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 # The following comment should be removed at some point in the future.
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2 # mypy: strict-optional=False
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3
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4 from __future__ import absolute_import
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5
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6 import contextlib
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7 import errno
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8 import hashlib
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9 import logging
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10 import os
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11
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12 from pip._vendor import contextlib2
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13
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14 from pip._internal.utils.temp_dir import TempDirectory
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15 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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16
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17 if MYPY_CHECK_RUNNING:
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18 from types import TracebackType
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19 from typing import Dict, Iterator, Optional, Set, Type, Union
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20 from pip._internal.req.req_install import InstallRequirement
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21 from pip._internal.models.link import Link
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22
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23 logger = logging.getLogger(__name__)
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24
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25
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26 @contextlib.contextmanager
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27 def update_env_context_manager(**changes):
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28 # type: (str) -> Iterator[None]
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29 target = os.environ
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30
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31 # Save values from the target and change them.
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32 non_existent_marker = object()
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33 saved_values = {} # type: Dict[str, Union[object, str]]
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34 for name, new_value in changes.items():
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35 try:
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36 saved_values[name] = target[name]
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37 except KeyError:
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38 saved_values[name] = non_existent_marker
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39 target[name] = new_value
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40
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41 try:
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42 yield
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43 finally:
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44 # Restore original values in the target.
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45 for name, original_value in saved_values.items():
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46 if original_value is non_existent_marker:
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47 del target[name]
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48 else:
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49 assert isinstance(original_value, str) # for mypy
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50 target[name] = original_value
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51
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52
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53 @contextlib.contextmanager
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54 def get_requirement_tracker():
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55 # type: () -> Iterator[RequirementTracker]
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56 root = os.environ.get('PIP_REQ_TRACKER')
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57 with contextlib2.ExitStack() as ctx:
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58 if root is None:
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59 root = ctx.enter_context(
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60 TempDirectory(kind='req-tracker')
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61 ).path
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62 ctx.enter_context(update_env_context_manager(PIP_REQ_TRACKER=root))
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63 logger.debug("Initialized build tracking at %s", root)
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64
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65 with RequirementTracker(root) as tracker:
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66 yield tracker
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67
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68
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69 class RequirementTracker(object):
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70
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71 def __init__(self, root):
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72 # type: (str) -> None
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73 self._root = root
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74 self._entries = set() # type: Set[InstallRequirement]
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75 logger.debug("Created build tracker: %s", self._root)
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76
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77 def __enter__(self):
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78 # type: () -> RequirementTracker
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79 logger.debug("Entered build tracker: %s", self._root)
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80 return self
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81
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82 def __exit__(
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83 self,
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84 exc_type, # type: Optional[Type[BaseException]]
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85 exc_val, # type: Optional[BaseException]
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86 exc_tb # type: Optional[TracebackType]
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87 ):
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88 # type: (...) -> None
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89 self.cleanup()
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90
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91 def _entry_path(self, link):
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92 # type: (Link) -> str
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93 hashed = hashlib.sha224(link.url_without_fragment.encode()).hexdigest()
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94 return os.path.join(self._root, hashed)
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95
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96 def add(self, req):
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97 # type: (InstallRequirement) -> None
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98 """Add an InstallRequirement to build tracking.
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99 """
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100
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101 # Get the file to write information about this requirement.
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102 entry_path = self._entry_path(req.link)
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103
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104 # Try reading from the file. If it exists and can be read from, a build
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105 # is already in progress, so a LookupError is raised.
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106 try:
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107 with open(entry_path) as fp:
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108 contents = fp.read()
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109 except IOError as e:
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110 # if the error is anything other than "file does not exist", raise.
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111 if e.errno != errno.ENOENT:
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112 raise
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113 else:
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114 message = '%s is already being built: %s' % (req.link, contents)
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115 raise LookupError(message)
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116
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117 # If we're here, req should really not be building already.
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118 assert req not in self._entries
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119
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120 # Start tracking this requirement.
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121 with open(entry_path, 'w') as fp:
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122 fp.write(str(req))
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123 self._entries.add(req)
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124
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125 logger.debug('Added %s to build tracker %r', req, self._root)
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126
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127 def remove(self, req):
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128 # type: (InstallRequirement) -> None
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129 """Remove an InstallRequirement from build tracking.
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130 """
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131
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132 # Delete the created file and the corresponding entries.
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133 os.unlink(self._entry_path(req.link))
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134 self._entries.remove(req)
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135
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136 logger.debug('Removed %s from build tracker %r', req, self._root)
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137
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138 def cleanup(self):
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139 # type: () -> None
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140 for req in set(self._entries):
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141 self.remove(req)
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142
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143 logger.debug("Removed build tracker: %r", self._root)
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144
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145 @contextlib.contextmanager
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146 def track(self, req):
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147 # type: (InstallRequirement) -> Iterator[None]
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148 self.add(req)
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149 yield
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150 self.remove(req)