Mercurial > cpython-lru_cache-weakref

annotate Lib/distutils/dir_util.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents a56cebff113a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """distutils.dir_util
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2
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3 Utility functions for manipulating directories and directory trees."""
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4
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5 __revision__ = "$Id$"
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6
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7 import os
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8 import errno
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9 from distutils.errors import DistutilsFileError, DistutilsInternalError
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10 from distutils import log
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11
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12 # cache for by mkpath() -- in addition to cheapening redundant calls,
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13 # eliminates redundant "creating /foo/bar/baz" messages in dry-run mode
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14 _path_created = {}
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15
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16 # I don't use os.makedirs because a) it's new to Python 1.5.2, and
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17 # b) it blows up if the directory already exists (I want to silently
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18 # succeed in that case).
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19 def mkpath(name, mode=0777, verbose=1, dry_run=0):
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20 """Create a directory and any missing ancestor directories.
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21
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22 If the directory already exists (or if 'name' is the empty string, which
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23 means the current directory, which of course exists), then do nothing.
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24 Raise DistutilsFileError if unable to create some directory along the way
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25 (eg. some sub-path exists, but is a file rather than a directory).
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26 If 'verbose' is true, print a one-line summary of each mkdir to stdout.
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27 Return the list of directories actually created.
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28 """
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29
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30 global _path_created
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31
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32 # Detect a common bug -- name is None
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33 if not isinstance(name, basestring):
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34 raise DistutilsInternalError, \
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35 "mkpath: 'name' must be a string (got %r)" % (name,)
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36
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37 # XXX what's the better way to handle verbosity? print as we create
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38 # each directory in the path (the current behaviour), or only announce
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39 # the creation of the whole path? (quite easy to do the latter since
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40 # we're not using a recursive algorithm)
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41
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42 name = os.path.normpath(name)
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43 created_dirs = []
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44 if os.path.isdir(name) or name == '':
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45 return created_dirs
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46 if _path_created.get(os.path.abspath(name)):
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47 return created_dirs
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48
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49 (head, tail) = os.path.split(name)
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50 tails = [tail] # stack of lone dirs to create
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51
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52 while head and tail and not os.path.isdir(head):
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53 (head, tail) = os.path.split(head)
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54 tails.insert(0, tail) # push next higher dir onto stack
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55
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56 # now 'head' contains the deepest directory that already exists
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57 # (that is, the child of 'head' in 'name' is the highest directory
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58 # that does *not* exist)
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59 for d in tails:
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60 #print "head = %s, d = %s: " % (head, d),
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61 head = os.path.join(head, d)
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62 abs_head = os.path.abspath(head)
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63
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64 if _path_created.get(abs_head):
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65 continue
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66
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67 if verbose >= 1:
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68 log.info("creating %s", head)
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69
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70 if not dry_run:
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71 try:
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72 os.mkdir(head, mode)
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73 except OSError, exc:
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74 if not (exc.errno == errno.EEXIST and os.path.isdir(head)):
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75 raise DistutilsFileError(
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76 "could not create '%s': %s" % (head, exc.args[-1]))
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77 created_dirs.append(head)
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78
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79 _path_created[abs_head] = 1
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80 return created_dirs
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81
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82 def create_tree(base_dir, files, mode=0777, verbose=1, dry_run=0):
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83 """Create all the empty directories under 'base_dir' needed to put 'files'
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84 there.
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85
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86 'base_dir' is just the a name of a directory which doesn't necessarily
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87 exist yet; 'files' is a list of filenames to be interpreted relative to
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88 'base_dir'. 'base_dir' + the directory portion of every file in 'files'
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89 will be created if it doesn't already exist. 'mode', 'verbose' and
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90 'dry_run' flags are as for 'mkpath()'.
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91 """
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92 # First get the list of directories to create
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93 need_dir = {}
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94 for file in files:
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95 need_dir[os.path.join(base_dir, os.path.dirname(file))] = 1
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96 need_dirs = need_dir.keys()
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97 need_dirs.sort()
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98
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99 # Now create them
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100 for dir in need_dirs:
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101 mkpath(dir, mode, verbose=verbose, dry_run=dry_run)
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102
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103 def copy_tree(src, dst, preserve_mode=1, preserve_times=1,
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104 preserve_symlinks=0, update=0, verbose=1, dry_run=0):
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105 """Copy an entire directory tree 'src' to a new location 'dst'.
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106
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107 Both 'src' and 'dst' must be directory names. If 'src' is not a
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108 directory, raise DistutilsFileError. If 'dst' does not exist, it is
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109 created with 'mkpath()'. The end result of the copy is that every
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110 file in 'src' is copied to 'dst', and directories under 'src' are
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111 recursively copied to 'dst'. Return the list of files that were
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112 copied or might have been copied, using their output name. The
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113 return value is unaffected by 'update' or 'dry_run': it is simply
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114 the list of all files under 'src', with the names changed to be
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115 under 'dst'.
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116
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117 'preserve_mode' and 'preserve_times' are the same as for
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118 'copy_file'; note that they only apply to regular files, not to
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119 directories. If 'preserve_symlinks' is true, symlinks will be
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120 copied as symlinks (on platforms that support them!); otherwise
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121 (the default), the destination of the symlink will be copied.
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122 'update' and 'verbose' are the same as for 'copy_file'.
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123 """
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124 from distutils.file_util import copy_file
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125
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126 if not dry_run and not os.path.isdir(src):
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127 raise DistutilsFileError, \
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128 "cannot copy tree '%s': not a directory" % src
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129 try:
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130 names = os.listdir(src)
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131 except os.error, (errno, errstr):
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132 if dry_run:
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133 names = []
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134 else:
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135 raise DistutilsFileError, \
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136 "error listing files in '%s': %s" % (src, errstr)
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137
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138 if not dry_run:
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139 mkpath(dst, verbose=verbose)
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140
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141 outputs = []
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142
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143 for n in names:
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144 src_name = os.path.join(src, n)
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145 dst_name = os.path.join(dst, n)
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146
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147 if n.startswith('.nfs'):
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148 # skip NFS rename files
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149 continue
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150
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151 if preserve_symlinks and os.path.islink(src_name):
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152 link_dest = os.readlink(src_name)
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153 if verbose >= 1:
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154 log.info("linking %s -> %s", dst_name, link_dest)
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155 if not dry_run:
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156 os.symlink(link_dest, dst_name)
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157 outputs.append(dst_name)
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158
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159 elif os.path.isdir(src_name):
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160 outputs.extend(
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161 copy_tree(src_name, dst_name, preserve_mode,
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162 preserve_times, preserve_symlinks, update,
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163 verbose=verbose, dry_run=dry_run))
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164 else:
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165 copy_file(src_name, dst_name, preserve_mode,
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166 preserve_times, update, verbose=verbose,
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167 dry_run=dry_run)
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168 outputs.append(dst_name)
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169
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170 return outputs
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171
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172 def _build_cmdtuple(path, cmdtuples):
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173 """Helper for remove_tree()."""
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174 for f in os.listdir(path):
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175 real_f = os.path.join(path,f)
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176 if os.path.isdir(real_f) and not os.path.islink(real_f):
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177 _build_cmdtuple(real_f, cmdtuples)
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178 else:
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179 cmdtuples.append((os.remove, real_f))
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180 cmdtuples.append((os.rmdir, path))
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181
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182 def remove_tree(directory, verbose=1, dry_run=0):
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183 """Recursively remove an entire directory tree.
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184
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185 Any errors are ignored (apart from being reported to stdout if 'verbose'
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186 is true).
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187 """
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188 from distutils.util import grok_environment_error
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189 global _path_created
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190
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191 if verbose >= 1:
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192 log.info("removing '%s' (and everything under it)", directory)
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193 if dry_run:
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194 return
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195 cmdtuples = []
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196 _build_cmdtuple(directory, cmdtuples)
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197 for cmd in cmdtuples:
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198 try:
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199 cmd[0](cmd[1])
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200 # remove dir from cache if it's already there
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201 abspath = os.path.abspath(cmd[1])
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202 if abspath in _path_created:
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203 del _path_created[abspath]
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204 except (IOError, OSError), exc:
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205 log.warn(grok_environment_error(
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206 exc, "error removing %s: " % directory))
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207
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208 def ensure_relative(path):
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209 """Take the full path 'path', and make it a relative path.
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210
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211 This is useful to make 'path' the second argument to os.path.join().
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212 """
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213 drive, path = os.path.splitdrive(path)
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214 if path[0:1] == os.sep:
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215 path = drive + path[1:]
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216 return path