Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/pip/_internal/req/req_tracker.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import contextlib |
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2 import hashlib |
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3 import logging |
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4 import os |
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5 |
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6 from pip._vendor import contextlib2 |
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7 |
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8 from pip._internal.utils.temp_dir import TempDirectory |
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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 types import TracebackType |
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13 from typing import Dict, Iterator, Optional, Set, Type, Union |
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14 |
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15 from pip._internal.models.link import Link |
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16 from pip._internal.req.req_install import InstallRequirement |
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17 |
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18 logger = logging.getLogger(__name__) |
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19 |
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20 |
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21 @contextlib.contextmanager |
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22 def update_env_context_manager(**changes): |
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23 # type: (str) -> Iterator[None] |
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24 target = os.environ |
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25 |
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26 # Save values from the target and change them. |
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27 non_existent_marker = object() |
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28 saved_values = {} # type: Dict[str, Union[object, str]] |
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29 for name, new_value in changes.items(): |
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30 try: |
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31 saved_values[name] = target[name] |
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32 except KeyError: |
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33 saved_values[name] = non_existent_marker |
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34 target[name] = new_value |
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35 |
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36 try: |
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37 yield |
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38 finally: |
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39 # Restore original values in the target. |
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40 for name, original_value in saved_values.items(): |
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41 if original_value is non_existent_marker: |
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42 del target[name] |
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43 else: |
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44 assert isinstance(original_value, str) # for mypy |
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45 target[name] = original_value |
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46 |
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47 |
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48 @contextlib.contextmanager |
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49 def get_requirement_tracker(): |
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50 # type: () -> Iterator[RequirementTracker] |
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51 root = os.environ.get('PIP_REQ_TRACKER') |
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52 with contextlib2.ExitStack() as ctx: |
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53 if root is None: |
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54 root = ctx.enter_context( |
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55 TempDirectory(kind='req-tracker') |
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56 ).path |
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57 ctx.enter_context(update_env_context_manager(PIP_REQ_TRACKER=root)) |
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58 logger.debug("Initialized build tracking at %s", root) |
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59 |
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60 with RequirementTracker(root) as tracker: |
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61 yield tracker |
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62 |
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63 |
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64 class RequirementTracker: |
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65 |
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66 def __init__(self, root): |
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67 # type: (str) -> None |
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68 self._root = root |
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69 self._entries = set() # type: Set[InstallRequirement] |
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70 logger.debug("Created build tracker: %s", self._root) |
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71 |
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72 def __enter__(self): |
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73 # type: () -> RequirementTracker |
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74 logger.debug("Entered build tracker: %s", self._root) |
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75 return self |
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76 |
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77 def __exit__( |
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78 self, |
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79 exc_type, # type: Optional[Type[BaseException]] |
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80 exc_val, # type: Optional[BaseException] |
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81 exc_tb # type: Optional[TracebackType] |
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82 ): |
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83 # type: (...) -> None |
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84 self.cleanup() |
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85 |
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86 def _entry_path(self, link): |
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87 # type: (Link) -> str |
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88 hashed = hashlib.sha224(link.url_without_fragment.encode()).hexdigest() |
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89 return os.path.join(self._root, hashed) |
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90 |
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91 def add(self, req): |
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92 # type: (InstallRequirement) -> None |
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93 """Add an InstallRequirement to build tracking. |
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94 """ |
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95 |
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96 assert req.link |
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97 # Get the file to write information about this requirement. |
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98 entry_path = self._entry_path(req.link) |
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99 |
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100 # Try reading from the file. If it exists and can be read from, a build |
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101 # is already in progress, so a LookupError is raised. |
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102 try: |
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103 with open(entry_path) as fp: |
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104 contents = fp.read() |
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105 except FileNotFoundError: |
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106 pass |
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107 else: |
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108 message = '{} is already being built: {}'.format( |
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109 req.link, contents) |
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110 raise LookupError(message) |
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111 |
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112 # If we're here, req should really not be building already. |
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113 assert req not in self._entries |
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114 |
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115 # Start tracking this requirement. |
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116 with open(entry_path, 'w') as fp: |
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117 fp.write(str(req)) |
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118 self._entries.add(req) |
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119 |
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120 logger.debug('Added %s to build tracker %r', req, self._root) |
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121 |
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122 def remove(self, req): |
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123 # type: (InstallRequirement) -> None |
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124 """Remove an InstallRequirement from build tracking. |
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125 """ |
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126 |
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127 assert req.link |
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128 # Delete the created file and the corresponding entries. |
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129 os.unlink(self._entry_path(req.link)) |
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130 self._entries.remove(req) |
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131 |
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132 logger.debug('Removed %s from build tracker %r', req, self._root) |
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133 |
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134 def cleanup(self): |
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135 # type: () -> None |
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136 for req in set(self._entries): |
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137 self.remove(req) |
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138 |
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139 logger.debug("Removed build tracker: %r", self._root) |
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140 |
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141 @contextlib.contextmanager |
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142 def track(self, req): |
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143 # type: (InstallRequirement) -> Iterator[None] |
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144 self.add(req) |
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145 yield |
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146 self.remove(req) |