Mercurial > cpython-lru_cache-weakref

annotate Lib/filecmp.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents bae889f44cd1
children a9dd5e6d6805
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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, use_statcache=0) -> 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 import statcache
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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, use_statcache=0):
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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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33 use_statcache -- Do not stat() each file directly: go through
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34 the statcache module for more efficiency.
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35
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36 Return value:
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37
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38 integer -- 1 if the files are the same, 0 otherwise.
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39
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40 This function uses a cache for past comparisons and the results,
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41 with a cache invalidation mechanism relying on stale signatures.
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42 Of course, if 'use_statcache' is true, this mechanism is defeated,
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43 and the cache will never grow stale.
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44
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45 """
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46 if use_statcache:
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47 stat_function = statcache.stat
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48 else:
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49 stat_function = os.stat
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50 s1 = _sig(stat_function(f1))
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51 s2 = _sig(stat_function(f2))
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52 if s1[0] != stat.S_IFREG or s2[0] != stat.S_IFREG:
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53 return 0
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54 if shallow and s1 == s2:
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55 return 1
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56 if s1[1] != s2[1]:
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57 return 0
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58
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59 result = _cache.get((f1, f2))
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60 if result and (s1, s2) == result[:2]:
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61 return result[2]
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62 outcome = _do_cmp(f1, f2)
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63 _cache[f1, f2] = s1, s2, outcome
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64 return outcome
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65
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66 def _sig(st):
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67 return (stat.S_IFMT(st[stat.ST_MODE]),
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68 st[stat.ST_SIZE],
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69 st[stat.ST_MTIME])
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70
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71 def _do_cmp(f1, f2):
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72 bufsize = BUFSIZE
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73 fp1 = open(f1, 'rb')
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74 fp2 = open(f2, 'rb')
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75 while 1:
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76 b1 = fp1.read(bufsize)
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77 b2 = fp2.read(bufsize)
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78 if b1 != b2:
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79 return 0
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80 if not b1:
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81 return 1
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82
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83 # Directory comparison class.
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84 #
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85 class dircmp:
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86 """A class that manages the comparison of 2 directories.
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87
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88 dircmp(a,b,ignore=None,hide=None)
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89 A and B are directories.
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90 IGNORE is a list of names to ignore,
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91 defaults to ['RCS', 'CVS', 'tags'].
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92 HIDE is a list of names to hide,
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93 defaults to [os.curdir, os.pardir].
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94
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95 High level usage:
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96 x = dircmp(dir1, dir2)
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97 x.report() -> prints a report on the differences between dir1 and dir2
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98 or
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99 x.report_partial_closure() -> prints report on differences between dir1
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100 and dir2, and reports on common immediate subdirectories.
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101 x.report_full_closure() -> like report_partial_closure,
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102 but fully recursive.
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103
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104 Attributes:
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105 left_list, right_list: The files in dir1 and dir2,
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106 filtered by hide and ignore.
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107 common: a list of names in both dir1 and dir2.
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108 left_only, right_only: names only in dir1, dir2.
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109 common_dirs: subdirectories in both dir1 and dir2.
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110 common_files: files in both dir1 and dir2.
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111 common_funny: names in both dir1 and dir2 where the type differs between
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112 dir1 and dir2, or the name is not stat-able.
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113 same_files: list of identical files.
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114 diff_files: list of filenames which differ.
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115 funny_files: list of files which could not be compared.
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116 subdirs: a dictionary of dircmp objects, keyed by names in common_dirs.
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117 """
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118
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119 def __init__(self, a, b, ignore=None, hide=None): # Initialize
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120 self.left = a
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121 self.right = b
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122 if hide is None:
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123 self.hide = [os.curdir, os.pardir] # Names never to be shown
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124 else:
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125 self.hide = hide
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126 if ignore is None:
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127 self.ignore = ['RCS', 'CVS', 'tags'] # Names ignored in comparison
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128 else:
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129 self.ignore = ignore
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130
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131 def phase0(self): # Compare everything except common subdirectories
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132 self.left_list = _filter(os.listdir(self.left),
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133 self.hide+self.ignore)
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134 self.right_list = _filter(os.listdir(self.right),
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135 self.hide+self.ignore)
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136 self.left_list.sort()
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137 self.right_list.sort()
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138
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139 __p4_attrs = ('subdirs',)
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140 __p3_attrs = ('same_files', 'diff_files', 'funny_files')
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141 __p2_attrs = ('common_dirs', 'common_files', 'common_funny')
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142 __p1_attrs = ('common', 'left_only', 'right_only')
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143 __p0_attrs = ('left_list', 'right_list')
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144
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145 def __getattr__(self, attr):
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146 if attr in self.__p4_attrs:
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147 self.phase4()
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148 elif attr in self.__p3_attrs:
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149 self.phase3()
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150 elif attr in self.__p2_attrs:
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151 self.phase2()
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152 elif attr in self.__p1_attrs:
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153 self.phase1()
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154 elif attr in self.__p0_attrs:
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155 self.phase0()
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156 else:
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157 raise AttributeError, attr
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158 return getattr(self, attr)
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159
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160 def phase1(self): # Compute common names
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161 a_only, b_only = [], []
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162 common = {}
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163 b = {}
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164 for fnm in self.right_list:
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165 b[fnm] = 1
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166 for x in self.left_list:
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167 if b.get(x, 0):
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168 common[x] = 1
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169 else:
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170 a_only.append(x)
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171 for x in self.right_list:
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172 if common.get(x, 0):
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173 pass
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174 else:
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175 b_only.append(x)
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176 self.common = common.keys()
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177 self.left_only = a_only
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178 self.right_only = b_only
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179
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180 def phase2(self): # Distinguish files, directories, funnies
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181 self.common_dirs = []
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182 self.common_files = []
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183 self.common_funny = []
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184
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185 for x in self.common:
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186 a_path = os.path.join(self.left, x)
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187 b_path = os.path.join(self.right, x)
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188
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189 ok = 1
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190 try:
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191 a_stat = statcache.stat(a_path)
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192 except os.error, why:
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193 # print 'Can\'t stat', a_path, ':', why[1]
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194 ok = 0
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195 try:
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196 b_stat = statcache.stat(b_path)
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197 except os.error, why:
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198 # print 'Can\'t stat', b_path, ':', why[1]
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199 ok = 0
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200
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201 if ok:
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202 a_type = stat.S_IFMT(a_stat[stat.ST_MODE])
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203 b_type = stat.S_IFMT(b_stat[stat.ST_MODE])
15543
785155e2cfca Update the code to better reflect recommended style:
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204 if a_type != b_type:
13126
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205 self.common_funny.append(x)
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206 elif stat.S_ISDIR(a_type):
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207 self.common_dirs.append(x)
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208 elif stat.S_ISREG(a_type):
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209 self.common_files.append(x)
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210 else:
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211 self.common_funny.append(x)
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212 else:
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213 self.common_funny.append(x)
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214
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215 def phase3(self): # Find out differences between common files
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216 xx = cmpfiles(self.left, self.right, self.common_files)
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217 self.same_files, self.diff_files, self.funny_files = xx
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218
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219 def phase4(self): # Find out differences between common subdirectories
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220 # A new dircmp object is created for each common subdirectory,
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221 # these are stored in a dictionary indexed by filename.
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222 # The hide and ignore properties are inherited from the parent
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223 self.subdirs = {}
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224 for x in self.common_dirs:
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225 a_x = os.path.join(self.left, x)
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226 b_x = os.path.join(self.right, x)
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227 self.subdirs[x] = dircmp(a_x, b_x, self.ignore, self.hide)
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228
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229 def phase4_closure(self): # Recursively call phase4() on subdirectories
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230 self.phase4()
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231 for x in self.subdirs.keys():
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232 self.subdirs[x].phase4_closure()
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233
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234 def report(self): # Print a report on the differences between a and b
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235 # Output format is purposely lousy
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236 print 'diff', self.left, self.right
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237 if self.left_only:
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238 self.left_only.sort()
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239 print 'Only in', self.left, ':', self.left_only
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240 if self.right_only:
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241 self.right_only.sort()
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242 print 'Only in', self.right, ':', self.right_only
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243 if self.same_files:
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244 self.same_files.sort()
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245 print 'Identical files :', self.same_files
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246 if self.diff_files:
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247 self.diff_files.sort()
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248 print 'Differing files :', self.diff_files
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249 if self.funny_files:
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250 self.funny_files.sort()
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251 print 'Trouble with common files :', self.funny_files
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252 if self.common_dirs:
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253 self.common_dirs.sort()
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254 print 'Common subdirectories :', self.common_dirs
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255 if self.common_funny:
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256 self.common_funny.sort()
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diff changeset
257 print 'Common funny cases :', self.common_funny
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258
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259 def report_partial_closure(self): # Print reports on self and on subdirs
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260 self.report()
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261 for x in self.subdirs.keys():
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262 print
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263 self.subdirs[x].report()
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264
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265 def report_full_closure(self): # Report on self and subdirs recursively
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266 self.report()
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267 for x in self.subdirs.keys():
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268 print
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269 self.subdirs[x].report_full_closure()
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270
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271
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272 def cmpfiles(a, b, common, shallow=1, use_statcache=0):
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273 """Compare common files in two directories.
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274
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275 a, b -- directory names
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276 common -- list of file names found in both directories
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277 shallow -- if true, do comparison based solely on stat() information
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278 use_statcache -- if true, use statcache.stat() instead of os.stat()
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279
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280 Returns a tuple of three lists:
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281 files that compare equal
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282 files that are different
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283 filenames that aren't regular files.
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284
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285 """
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286 res = ([], [], [])
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287 for x in common:
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288 ax = os.path.join(a, x)
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289 bx = os.path.join(b, x)
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290 res[_cmp(ax, bx, shallow, use_statcache)].append(x)
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291 return res
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292
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293
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294 # Compare two files.
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295 # Return:
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296 # 0 for equal
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297 # 1 for different
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298 # 2 for funny cases (can't stat, etc.)
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299 #
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300 def _cmp(a, b, sh, st):
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301 try:
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302 return not abs(cmp(a, b, sh, st))
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303 except os.error:
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304 return 2
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305
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306
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307 # Return a copy with items that occur in skip removed.
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308 #
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309 def _filter(list, skip):
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310 result = []
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311 for item in list:
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312 if item not in skip: result.append(item)
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313 return result
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314
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315
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316 # Demonstration and testing.
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317 #
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318 def demo():
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319 import sys
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320 import getopt
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321 options, args = getopt.getopt(sys.argv[1:], 'r')
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322 if len(args) != 2:
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323 raise getopt.error, 'need exactly two args'
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324 dd = dircmp(args[0], args[1])
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325 if ('-r', '') in options:
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326 dd.report_full_closure()
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327 else:
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328 dd.report()
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329
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330 if __name__ == '__main__':
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331 demo()