Mercurial > cpython-lru_cache-weakref

annotate Lib/filecmp.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 11568c59d9d4
children 1823cf6e1084
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1 """Utilities for comparing files and directories.
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2
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3 Classes:
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4 dircmp
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5
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6 Functions:
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7 cmp(f1, f2, shallow=1) -> int
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8 cmpfiles(a, b, common) -> ([], [], [])
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9
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10 """
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11
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12 import os
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13 import stat
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14 from itertools import ifilter, ifilterfalse, imap, izip
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15
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16 __all__ = ["cmp","dircmp","cmpfiles"]
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17
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18 _cache = {}
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19 BUFSIZE=8*1024
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20
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21 def cmp(f1, f2, shallow=1):
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22 """Compare two files.
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23
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24 Arguments:
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25
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26 f1 -- First file name
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28 f2 -- Second file name
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29
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30 shallow -- Just check stat signature (do not read the files).
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31 defaults to 1.
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32
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33 Return value:
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34
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35 True if the files are the same, False otherwise.
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36
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37 This function uses a cache for past comparisons and the results,
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38 with a cache invalidation mechanism relying on stale signatures.
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39
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40 """
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41
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42 s1 = _sig(os.stat(f1))
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43 s2 = _sig(os.stat(f2))
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44 if s1[0] != stat.S_IFREG or s2[0] != stat.S_IFREG:
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45 return False
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46 if shallow and s1 == s2:
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47 return True
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48 if s1[1] != s2[1]:
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49 return False
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50
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51 outcome = _cache.get((f1, f2, s1, s2))
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52 if outcome is None:
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53 outcome = _do_cmp(f1, f2)
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54 if len(_cache) > 100: # limit the maximum size of the cache
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55 _cache.clear()
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56 _cache[f1, f2, s1, s2] = outcome
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57 return outcome
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58
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59 def _sig(st):
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60 return (stat.S_IFMT(st.st_mode),
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61 st.st_size,
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62 st.st_mtime)
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63
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64 def _do_cmp(f1, f2):
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65 bufsize = BUFSIZE
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66 with open(f1, 'rb') as fp1, open(f2, 'rb') as fp2:
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67 while True:
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68 b1 = fp1.read(bufsize)
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69 b2 = fp2.read(bufsize)
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70 if b1 != b2:
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71 return False
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72 if not b1:
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73 return True
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74
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75 # Directory comparison class.
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76 #
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77 class dircmp:
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78 """A class that manages the comparison of 2 directories.
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79
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80 dircmp(a,b,ignore=None,hide=None)
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81 A and B are directories.
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82 IGNORE is a list of names to ignore,
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83 defaults to ['RCS', 'CVS', 'tags'].
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84 HIDE is a list of names to hide,
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85 defaults to [os.curdir, os.pardir].
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86
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87 High level usage:
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88 x = dircmp(dir1, dir2)
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89 x.report() -> prints a report on the differences between dir1 and dir2
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90 or
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91 x.report_partial_closure() -> prints report on differences between dir1
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92 and dir2, and reports on common immediate subdirectories.
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93 x.report_full_closure() -> like report_partial_closure,
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94 but fully recursive.
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95
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96 Attributes:
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97 left_list, right_list: The files in dir1 and dir2,
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98 filtered by hide and ignore.
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99 common: a list of names in both dir1 and dir2.
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100 left_only, right_only: names only in dir1, dir2.
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101 common_dirs: subdirectories in both dir1 and dir2.
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102 common_files: files in both dir1 and dir2.
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103 common_funny: names in both dir1 and dir2 where the type differs between
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104 dir1 and dir2, or the name is not stat-able.
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105 same_files: list of identical files.
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106 diff_files: list of filenames which differ.
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107 funny_files: list of files which could not be compared.
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108 subdirs: a dictionary of dircmp objects, keyed by names in common_dirs.
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109 """
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110
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111 def __init__(self, a, b, ignore=None, hide=None): # Initialize
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112 self.left = a
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113 self.right = b
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114 if hide is None:
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115 self.hide = [os.curdir, os.pardir] # Names never to be shown
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116 else:
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117 self.hide = hide
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118 if ignore is None:
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119 self.ignore = ['RCS', 'CVS', 'tags'] # Names ignored in comparison
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120 else:
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121 self.ignore = ignore
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122
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123 def phase0(self): # Compare everything except common subdirectories
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124 self.left_list = _filter(os.listdir(self.left),
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125 self.hide+self.ignore)
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126 self.right_list = _filter(os.listdir(self.right),
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127 self.hide+self.ignore)
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128 self.left_list.sort()
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129 self.right_list.sort()
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130
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131 def phase1(self): # Compute common names
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132 a = dict(izip(imap(os.path.normcase, self.left_list), self.left_list))
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133 b = dict(izip(imap(os.path.normcase, self.right_list), self.right_list))
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134 self.common = map(a.__getitem__, ifilter(b.__contains__, a))
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135 self.left_only = map(a.__getitem__, ifilterfalse(b.__contains__, a))
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136 self.right_only = map(b.__getitem__, ifilterfalse(a.__contains__, b))
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137
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138 def phase2(self): # Distinguish files, directories, funnies
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139 self.common_dirs = []
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140 self.common_files = []
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141 self.common_funny = []
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142
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143 for x in self.common:
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144 a_path = os.path.join(self.left, x)
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145 b_path = os.path.join(self.right, x)
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146
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147 ok = 1
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148 try:
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149 a_stat = os.stat(a_path)
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150 except os.error, why:
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151 # print 'Can\'t stat', a_path, ':', why[1]
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152 ok = 0
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153 try:
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154 b_stat = os.stat(b_path)
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155 except os.error, why:
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156 # print 'Can\'t stat', b_path, ':', why[1]
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157 ok = 0
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158
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159 if ok:
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160 a_type = stat.S_IFMT(a_stat.st_mode)
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161 b_type = stat.S_IFMT(b_stat.st_mode)
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162 if a_type != b_type:
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163 self.common_funny.append(x)
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164 elif stat.S_ISDIR(a_type):
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165 self.common_dirs.append(x)
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166 elif stat.S_ISREG(a_type):
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167 self.common_files.append(x)
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168 else:
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169 self.common_funny.append(x)
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170 else:
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171 self.common_funny.append(x)
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172
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173 def phase3(self): # Find out differences between common files
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174 xx = cmpfiles(self.left, self.right, self.common_files)
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175 self.same_files, self.diff_files, self.funny_files = xx
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176
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177 def phase4(self): # Find out differences between common subdirectories
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178 # A new dircmp object is created for each common subdirectory,
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179 # these are stored in a dictionary indexed by filename.
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180 # The hide and ignore properties are inherited from the parent
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181 self.subdirs = {}
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182 for x in self.common_dirs:
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183 a_x = os.path.join(self.left, x)
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184 b_x = os.path.join(self.right, x)
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185 self.subdirs[x] = dircmp(a_x, b_x, self.ignore, self.hide)
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186
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187 def phase4_closure(self): # Recursively call phase4() on subdirectories
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188 self.phase4()
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189 for sd in self.subdirs.itervalues():
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190 sd.phase4_closure()
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191
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192 def report(self): # Print a report on the differences between a and b
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193 # Output format is purposely lousy
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194 print 'diff', self.left, self.right
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195 if self.left_only:
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196 self.left_only.sort()
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197 print 'Only in', self.left, ':', self.left_only
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198 if self.right_only:
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199 self.right_only.sort()
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200 print 'Only in', self.right, ':', self.right_only
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201 if self.same_files:
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202 self.same_files.sort()
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203 print 'Identical files :', self.same_files
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204 if self.diff_files:
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205 self.diff_files.sort()
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206 print 'Differing files :', self.diff_files
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207 if self.funny_files:
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208 self.funny_files.sort()
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209 print 'Trouble with common files :', self.funny_files
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210 if self.common_dirs:
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211 self.common_dirs.sort()
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212 print 'Common subdirectories :', self.common_dirs
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213 if self.common_funny:
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214 self.common_funny.sort()
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215 print 'Common funny cases :', self.common_funny
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216
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217 def report_partial_closure(self): # Print reports on self and on subdirs
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218 self.report()
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219 for sd in self.subdirs.itervalues():
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220 print
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221 sd.report()
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222
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223 def report_full_closure(self): # Report on self and subdirs recursively
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224 self.report()
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225 for sd in self.subdirs.itervalues():
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226 print
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227 sd.report_full_closure()
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228
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229 methodmap = dict(subdirs=phase4,
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230 same_files=phase3, diff_files=phase3, funny_files=phase3,
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231 common_dirs = phase2, common_files=phase2, common_funny=phase2,
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232 common=phase1, left_only=phase1, right_only=phase1,
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233 left_list=phase0, right_list=phase0)
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234
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235 def __getattr__(self, attr):
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236 if attr not in self.methodmap:
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237 raise AttributeError, attr
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238 self.methodmap[attr](self)
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239 return getattr(self, attr)
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240
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241 def cmpfiles(a, b, common, shallow=1):
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242 """Compare common files in two directories.
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243
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244 a, b -- directory names
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245 common -- list of file names found in both directories
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246 shallow -- if true, do comparison based solely on stat() information
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247
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248 Returns a tuple of three lists:
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249 files that compare equal
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250 files that are different
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251 filenames that aren't regular files.
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252
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253 """
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254 res = ([], [], [])
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255 for x in common:
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256 ax = os.path.join(a, x)
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257 bx = os.path.join(b, x)
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258 res[_cmp(ax, bx, shallow)].append(x)
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259 return res
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260
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261
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262 # Compare two files.
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263 # Return:
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264 # 0 for equal
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265 # 1 for different
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266 # 2 for funny cases (can't stat, etc.)
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267 #
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268 def _cmp(a, b, sh, abs=abs, cmp=cmp):
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269 try:
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270 return not abs(cmp(a, b, sh))
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271 except os.error:
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272 return 2
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273
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274
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275 # Return a copy with items that occur in skip removed.
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276 #
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277 def _filter(flist, skip):
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278 return list(ifilterfalse(skip.__contains__, flist))
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279
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280
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281 # Demonstration and testing.
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282 #
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283 def demo():
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284 import sys
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285 import getopt
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286 options, args = getopt.getopt(sys.argv[1:], 'r')
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287 if len(args) != 2:
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288 raise getopt.GetoptError('need exactly two args', None)
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289 dd = dircmp(args[0], args[1])
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290 if ('-r', '') in options:
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291 dd.report_full_closure()
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292 else:
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293 dd.report()
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294
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295 if __name__ == '__main__':
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296 demo()