Mercurial > repos > guerler > springsuite
annotate planemo/lib/python3.7/site-packages/virtualenv/discovery/cached_py_info.py @ 1:56ad4e20f292 draft
"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author | guerler |
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date | Fri, 31 Jul 2020 00:32:28 -0400 |
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1 """ |
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2 |
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3 We acquire the python information by running an interrogation script via subprocess trigger. This operation is not |
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4 cheap, especially not on Windows. To not have to pay this hefty cost every time we apply multiple levels of |
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5 caching. |
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6 """ |
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7 from __future__ import absolute_import, unicode_literals |
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8 |
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9 import logging |
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10 import os |
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11 import pipes |
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12 import sys |
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13 from collections import OrderedDict |
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14 |
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15 from virtualenv.app_data import AppDataDisabled |
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16 from virtualenv.discovery.py_info import PythonInfo |
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17 from virtualenv.info import PY2 |
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18 from virtualenv.util.path import Path |
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19 from virtualenv.util.six import ensure_text |
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20 from virtualenv.util.subprocess import Popen, subprocess |
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21 |
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22 _CACHE = OrderedDict() |
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23 _CACHE[Path(sys.executable)] = PythonInfo() |
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24 |
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25 |
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26 def from_exe(cls, app_data, exe, raise_on_error=True, ignore_cache=False): |
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27 """""" |
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28 result = _get_from_cache(cls, app_data, exe, ignore_cache=ignore_cache) |
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29 if isinstance(result, Exception): |
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30 if raise_on_error: |
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31 raise result |
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32 else: |
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33 logging.info("%s", str(result)) |
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34 result = None |
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35 return result |
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36 |
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37 |
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38 def _get_from_cache(cls, app_data, exe, ignore_cache=True): |
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39 # note here we cannot resolve symlinks, as the symlink may trigger different prefix information if there's a |
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40 # pyenv.cfg somewhere alongside on python3.4+ |
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41 exe_path = Path(exe) |
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42 if not ignore_cache and exe_path in _CACHE: # check in the in-memory cache |
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43 result = _CACHE[exe_path] |
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44 else: # otherwise go through the app data cache |
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45 py_info = _get_via_file_cache(cls, app_data, exe_path, exe) |
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46 result = _CACHE[exe_path] = py_info |
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47 # independent if it was from the file or in-memory cache fix the original executable location |
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48 if isinstance(result, PythonInfo): |
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49 result.executable = exe |
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50 return result |
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51 |
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52 |
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53 def _get_via_file_cache(cls, app_data, path, exe): |
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54 path_text = ensure_text(str(path)) |
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55 try: |
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56 path_modified = path.stat().st_mtime |
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57 except OSError: |
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58 path_modified = -1 |
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59 if app_data is None: |
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60 app_data = AppDataDisabled() |
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61 py_info, py_info_store = None, app_data.py_info(path) |
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62 with py_info_store.locked(): |
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63 if py_info_store.exists(): # if exists and matches load |
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64 data = py_info_store.read() |
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65 of_path, of_st_mtime, of_content = data["path"], data["st_mtime"], data["content"] |
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66 if of_path == path_text and of_st_mtime == path_modified: |
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67 py_info = cls._from_dict({k: v for k, v in of_content.items()}) |
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68 else: |
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69 py_info_store.remove() |
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70 if py_info is None: # if not loaded run and save |
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71 failure, py_info = _run_subprocess(cls, exe, app_data) |
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72 if failure is None: |
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73 data = {"st_mtime": path_modified, "path": path_text, "content": py_info._to_dict()} |
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74 py_info_store.write(data) |
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75 else: |
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76 py_info = failure |
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77 return py_info |
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78 |
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79 |
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80 def _run_subprocess(cls, exe, app_data): |
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81 py_info_script = Path(os.path.abspath(__file__)).parent / "py_info.py" |
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82 with app_data.ensure_extracted(py_info_script) as py_info_script: |
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83 cmd = [exe, str(py_info_script)] |
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84 # prevent sys.prefix from leaking into the child process - see https://bugs.python.org/issue22490 |
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85 env = os.environ.copy() |
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86 env.pop("__PYVENV_LAUNCHER__", None) |
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87 logging.debug("get interpreter info via cmd: %s", LogCmd(cmd)) |
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88 try: |
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89 process = Popen( |
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90 cmd, |
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91 universal_newlines=True, |
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92 stdin=subprocess.PIPE, |
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93 stderr=subprocess.PIPE, |
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94 stdout=subprocess.PIPE, |
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95 env=env, |
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96 ) |
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97 out, err = process.communicate() |
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98 code = process.returncode |
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99 except OSError as os_error: |
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100 out, err, code = "", os_error.strerror, os_error.errno |
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101 result, failure = None, None |
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102 if code == 0: |
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103 result = cls._from_json(out) |
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104 result.executable = exe # keep original executable as this may contain initialization code |
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105 else: |
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106 msg = "failed to query {} with code {}{}{}".format( |
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107 exe, code, " out: {!r}".format(out) if out else "", " err: {!r}".format(err) if err else "", |
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108 ) |
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109 failure = RuntimeError(msg) |
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110 return failure, result |
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111 |
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112 |
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113 class LogCmd(object): |
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114 def __init__(self, cmd, env=None): |
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115 self.cmd = cmd |
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116 self.env = env |
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117 |
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118 def __repr__(self): |
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119 def e(v): |
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120 return v.decode("utf-8") if isinstance(v, bytes) else v |
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121 |
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122 cmd_repr = e(" ").join(pipes.quote(e(c)) for c in self.cmd) |
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123 if self.env is not None: |
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124 cmd_repr += e(" env of {!r}").format(self.env) |
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125 if PY2: |
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126 return cmd_repr.encode("utf-8") |
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127 return cmd_repr |
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128 |
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129 def __unicode__(self): |
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130 raw = repr(self) |
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131 if PY2: |
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132 return raw.decode("utf-8") |
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133 return raw |
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134 |
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135 |
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136 def clear(app_data): |
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137 app_data.py_info_clear() |
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138 _CACHE.clear() |
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139 |
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140 |
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141 ___all___ = ( |
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142 "from_exe", |
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143 "clear", |
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144 "LogCmd", |
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145 ) |