Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/pip/req/req_uninstall.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 from __future__ import absolute_import
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2
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3 import imp
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4 import logging
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5 import os
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6 import sys
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7 import tempfile
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8
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9 from pip.compat import uses_pycache, WINDOWS
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10 from pip.exceptions import UninstallationError
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11 from pip.utils import (rmtree, ask, is_local, dist_is_local, renames,
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12 normalize_path)
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13 from pip.utils.logging import indent_log
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14
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15
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16 logger = logging.getLogger(__name__)
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17
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18
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19 class UninstallPathSet(object):
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20 """A set of file paths to be removed in the uninstallation of a
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21 requirement."""
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22 def __init__(self, dist):
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23 self.paths = set()
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24 self._refuse = set()
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25 self.pth = {}
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26 self.dist = dist
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27 self.save_dir = None
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28 self._moved_paths = []
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29
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30 def _permitted(self, path):
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31 """
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32 Return True if the given path is one we are permitted to
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33 remove/modify, False otherwise.
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34
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35 """
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36 return is_local(path)
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37
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38 def _can_uninstall(self):
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39 if not dist_is_local(self.dist):
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40 logger.info(
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41 "Not uninstalling %s at %s, outside environment %s",
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42 self.dist.project_name,
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43 normalize_path(self.dist.location),
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44 sys.prefix,
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45 )
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46 return False
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47 return True
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48
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49 def add(self, path):
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50 path = normalize_path(path, resolve_symlinks=False)
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51 if not os.path.exists(path):
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52 return
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53 if self._permitted(path):
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54 self.paths.add(path)
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55 else:
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56 self._refuse.add(path)
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57
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58 # __pycache__ files can show up after 'installed-files.txt' is created,
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59 # due to imports
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60 if os.path.splitext(path)[1] == '.py' and uses_pycache:
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61 self.add(imp.cache_from_source(path))
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62
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63 def add_pth(self, pth_file, entry):
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64 pth_file = normalize_path(pth_file)
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65 if self._permitted(pth_file):
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66 if pth_file not in self.pth:
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67 self.pth[pth_file] = UninstallPthEntries(pth_file)
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68 self.pth[pth_file].add(entry)
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69 else:
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70 self._refuse.add(pth_file)
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71
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72 def compact(self, paths):
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73 """Compact a path set to contain the minimal number of paths
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74 necessary to contain all paths in the set. If /a/path/ and
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75 /a/path/to/a/file.txt are both in the set, leave only the
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76 shorter path."""
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77 short_paths = set()
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78 for path in sorted(paths, key=len):
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79 if not any([
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80 (path.startswith(shortpath) and
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81 path[len(shortpath.rstrip(os.path.sep))] == os.path.sep)
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82 for shortpath in short_paths]):
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83 short_paths.add(path)
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84 return short_paths
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85
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86 def _stash(self, path):
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87 return os.path.join(
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88 self.save_dir, os.path.splitdrive(path)[1].lstrip(os.path.sep))
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89
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90 def remove(self, auto_confirm=False):
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91 """Remove paths in ``self.paths`` with confirmation (unless
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92 ``auto_confirm`` is True)."""
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93 if not self._can_uninstall():
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94 return
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95 if not self.paths:
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96 logger.info(
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97 "Can't uninstall '%s'. No files were found to uninstall.",
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98 self.dist.project_name,
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99 )
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100 return
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101 logger.info(
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102 'Uninstalling %s-%s:',
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103 self.dist.project_name, self.dist.version
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104 )
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105
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106 with indent_log():
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107 paths = sorted(self.compact(self.paths))
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108
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109 if auto_confirm:
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110 response = 'y'
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111 else:
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112 for path in paths:
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113 logger.info(path)
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114 response = ask('Proceed (y/n)? ', ('y', 'n'))
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115 if self._refuse:
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116 logger.info('Not removing or modifying (outside of prefix):')
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117 for path in self.compact(self._refuse):
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118 logger.info(path)
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119 if response == 'y':
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120 self.save_dir = tempfile.mkdtemp(suffix='-uninstall',
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121 prefix='pip-')
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122 for path in paths:
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123 new_path = self._stash(path)
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124 logger.debug('Removing file or directory %s', path)
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125 self._moved_paths.append(path)
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126 renames(path, new_path)
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127 for pth in self.pth.values():
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128 pth.remove()
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129 logger.info(
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130 'Successfully uninstalled %s-%s',
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131 self.dist.project_name, self.dist.version
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132 )
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133
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134 def rollback(self):
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135 """Rollback the changes previously made by remove()."""
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136 if self.save_dir is None:
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137 logger.error(
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138 "Can't roll back %s; was not uninstalled",
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139 self.dist.project_name,
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140 )
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141 return False
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142 logger.info('Rolling back uninstall of %s', self.dist.project_name)
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143 for path in self._moved_paths:
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144 tmp_path = self._stash(path)
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145 logger.debug('Replacing %s', path)
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146 renames(tmp_path, path)
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147 for pth in self.pth.values():
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148 pth.rollback()
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149
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150 def commit(self):
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151 """Remove temporary save dir: rollback will no longer be possible."""
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152 if self.save_dir is not None:
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153 rmtree(self.save_dir)
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154 self.save_dir = None
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155 self._moved_paths = []
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156
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157
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158 class UninstallPthEntries(object):
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159 def __init__(self, pth_file):
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160 if not os.path.isfile(pth_file):
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161 raise UninstallationError(
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162 "Cannot remove entries from nonexistent file %s" % pth_file
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163 )
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164 self.file = pth_file
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165 self.entries = set()
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166 self._saved_lines = None
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167
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168 def add(self, entry):
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169 entry = os.path.normcase(entry)
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170 # On Windows, os.path.normcase converts the entry to use
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171 # backslashes. This is correct for entries that describe absolute
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172 # paths outside of site-packages, but all the others use forward
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173 # slashes.
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174 if WINDOWS and not os.path.splitdrive(entry)[0]:
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175 entry = entry.replace('\\', '/')
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176 self.entries.add(entry)
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177
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178 def remove(self):
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179 logger.debug('Removing pth entries from %s:', self.file)
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180 with open(self.file, 'rb') as fh:
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181 # windows uses '\r\n' with py3k, but uses '\n' with py2.x
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182 lines = fh.readlines()
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183 self._saved_lines = lines
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184 if any(b'\r\n' in line for line in lines):
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185 endline = '\r\n'
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186 else:
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187 endline = '\n'
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188 for entry in self.entries:
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189 try:
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190 logger.debug('Removing entry: %s', entry)
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191 lines.remove((entry + endline).encode("utf-8"))
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192 except ValueError:
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193 pass
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194 with open(self.file, 'wb') as fh:
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195 fh.writelines(lines)
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196
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197 def rollback(self):
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198 if self._saved_lines is None:
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199 logger.error(
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200 'Cannot roll back changes to %s, none were made', self.file
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201 )
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202 return False
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203 logger.debug('Rolling %s back to previous state', self.file)
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204 with open(self.file, 'wb') as fh:
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205 fh.writelines(self._saved_lines)
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206 return True