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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents c1ecdde32f86
children 44ba1572518f
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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 import warnings
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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=None):
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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 use_statcache -- obsolete argument.
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34
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35 Return value:
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36
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37 True if the files are the same, False otherwise.
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38
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39 This function uses a cache for past comparisons and the results,
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40 with a cache invalidation mechanism relying on stale signatures.
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41
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42 """
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43 if use_statcache is not None:
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44 warnings.warn("use_statcache argument is deprecated",
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45 DeprecationWarning)
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46
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47 s1 = _sig(os.stat(f1))
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48 s2 = _sig(os.stat(f2))
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49 if s1[0] != stat.S_IFREG or s2[0] != stat.S_IFREG:
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50 return False
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51 if shallow and s1 == s2:
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52 return True
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53 if s1[1] != s2[1]:
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54 return False
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55
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56 result = _cache.get((f1, f2))
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57 if result and (s1, s2) == result[:2]:
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58 return result[2]
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59 outcome = _do_cmp(f1, f2)
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60 _cache[f1, f2] = s1, s2, outcome
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61 return outcome
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62
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63 def _sig(st):
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64 return (stat.S_IFMT(st.st_mode),
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65 st.st_size,
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66 st.st_mtime)
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67
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68 def _do_cmp(f1, f2):
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69 bufsize = BUFSIZE
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70 fp1 = open(f1, 'rb')
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71 fp2 = open(f2, 'rb')
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72 while 1:
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73 b1 = fp1.read(bufsize)
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74 b2 = fp2.read(bufsize)
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75 if b1 != b2:
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76 return 0
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77 if not b1:
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78 return 1
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79
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80 # Directory comparison class.
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81 #
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82 class dircmp:
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83 """A class that manages the comparison of 2 directories.
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84
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85 dircmp(a,b,ignore=None,hide=None)
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86 A and B are directories.
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87 IGNORE is a list of names to ignore,
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88 defaults to ['RCS', 'CVS', 'tags'].
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89 HIDE is a list of names to hide,
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90 defaults to [os.curdir, os.pardir].
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91
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92 High level usage:
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93 x = dircmp(dir1, dir2)
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94 x.report() -> prints a report on the differences between dir1 and dir2
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95 or
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96 x.report_partial_closure() -> prints report on differences between dir1
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97 and dir2, and reports on common immediate subdirectories.
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98 x.report_full_closure() -> like report_partial_closure,
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99 but fully recursive.
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100
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101 Attributes:
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102 left_list, right_list: The files in dir1 and dir2,
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103 filtered by hide and ignore.
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104 common: a list of names in both dir1 and dir2.
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105 left_only, right_only: names only in dir1, dir2.
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106 common_dirs: subdirectories in both dir1 and dir2.
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107 common_files: files in both dir1 and dir2.
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108 common_funny: names in both dir1 and dir2 where the type differs between
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109 dir1 and dir2, or the name is not stat-able.
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110 same_files: list of identical files.
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111 diff_files: list of filenames which differ.
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112 funny_files: list of files which could not be compared.
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113 subdirs: a dictionary of dircmp objects, keyed by names in common_dirs.
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114 """
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115
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116 def __init__(self, a, b, ignore=None, hide=None): # Initialize
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117 self.left = a
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118 self.right = b
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119 if hide is None:
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120 self.hide = [os.curdir, os.pardir] # Names never to be shown
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121 else:
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122 self.hide = hide
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123 if ignore is None:
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124 self.ignore = ['RCS', 'CVS', 'tags'] # Names ignored in comparison
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125 else:
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126 self.ignore = ignore
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127
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128 def phase0(self): # Compare everything except common subdirectories
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129 self.left_list = _filter(os.listdir(self.left),
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130 self.hide+self.ignore)
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131 self.right_list = _filter(os.listdir(self.right),
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132 self.hide+self.ignore)
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133 self.left_list.sort()
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134 self.right_list.sort()
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135
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136 __p4_attrs = ('subdirs',)
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137 __p3_attrs = ('same_files', 'diff_files', 'funny_files')
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138 __p2_attrs = ('common_dirs', 'common_files', 'common_funny')
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139 __p1_attrs = ('common', 'left_only', 'right_only')
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140 __p0_attrs = ('left_list', 'right_list')
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141
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142 def __getattr__(self, attr):
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143 if attr in self.__p4_attrs:
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144 self.phase4()
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145 elif attr in self.__p3_attrs:
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146 self.phase3()
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147 elif attr in self.__p2_attrs:
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148 self.phase2()
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149 elif attr in self.__p1_attrs:
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150 self.phase1()
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151 elif attr in self.__p0_attrs:
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152 self.phase0()
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153 else:
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154 raise AttributeError, attr
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155 return getattr(self, attr)
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156
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157 def phase1(self): # Compute common names
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158 a_only, b_only = [], []
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159 common = {}
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160 b = {}
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161 for fnm in self.right_list:
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162 b[fnm] = 1
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163 for x in self.left_list:
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164 if b.get(x, 0):
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165 common[x] = 1
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166 else:
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167 a_only.append(x)
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168 for x in self.right_list:
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169 if common.get(x, 0):
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170 pass
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171 else:
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172 b_only.append(x)
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173 self.common = common.keys()
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174 self.left_only = a_only
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175 self.right_only = b_only
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176
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177 def phase2(self): # Distinguish files, directories, funnies
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178 self.common_dirs = []
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179 self.common_files = []
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180 self.common_funny = []
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181
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182 for x in self.common:
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183 a_path = os.path.join(self.left, x)
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184 b_path = os.path.join(self.right, x)
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185
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186 ok = 1
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187 try:
27724
3982f117679e [Bug #680494] filecmp.py uses obsolete statcache module.
Andrew M. Kuchling <amk@amk.ca>
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188 a_stat = os.stat(a_path)
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189 except os.error, why:
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190 # print 'Can\'t stat', a_path, ':', why[1]
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191 ok = 0
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192 try:
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3982f117679e [Bug #680494] filecmp.py uses obsolete statcache module.
Andrew M. Kuchling <amk@amk.ca>
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193 b_stat = os.stat(b_path)
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194 except os.error, why:
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195 # print 'Can\'t stat', b_path, ':', why[1]
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196 ok = 0
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197
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198 if ok:
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65cf478950ff Replaced obsolete stat module constants with equivalent attributes
Raymond Hettinger <python@rcn.com>
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199 a_type = stat.S_IFMT(a_stat.st_mode)
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Raymond Hettinger <python@rcn.com>
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diff changeset
200 b_type = stat.S_IFMT(b_stat.st_mode)
15543
785155e2cfca Update the code to better reflect recommended style:
Fred Drake <fdrake@acm.org>
parents: 15469
diff changeset
201 if a_type != b_type:
13126
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202 self.common_funny.append(x)
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203 elif stat.S_ISDIR(a_type):
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204 self.common_dirs.append(x)
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205 elif stat.S_ISREG(a_type):
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diff changeset
206 self.common_files.append(x)
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diff changeset
207 else:
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diff changeset
208 self.common_funny.append(x)
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diff changeset
209 else:
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diff changeset
210 self.common_funny.append(x)
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diff changeset
211
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diff changeset
212 def phase3(self): # Find out differences between common files
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diff changeset
213 xx = cmpfiles(self.left, self.right, self.common_files)
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diff changeset
214 self.same_files, self.diff_files, self.funny_files = xx
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diff changeset
215
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diff changeset
216 def phase4(self): # Find out differences between common subdirectories
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diff changeset
217 # A new dircmp object is created for each common subdirectory,
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diff changeset
218 # these are stored in a dictionary indexed by filename.
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219 # The hide and ignore properties are inherited from the parent
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diff changeset
220 self.subdirs = {}
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221 for x in self.common_dirs:
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diff changeset
222 a_x = os.path.join(self.left, x)
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223 b_x = os.path.join(self.right, x)
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224 self.subdirs[x] = dircmp(a_x, b_x, self.ignore, self.hide)
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diff changeset
225
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diff changeset
226 def phase4_closure(self): # Recursively call phase4() on subdirectories
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diff changeset
227 self.phase4()
23634
dbee2f628a90 Replaced .keys() with dictionary iterators
Raymond Hettinger <python@rcn.com>
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diff changeset
228 for sd in self.subdirs.itervalues():
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diff changeset
229 sd.phase4_closure()
13126
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230
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231 def report(self): # Print a report on the differences between a and b
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232 # Output format is purposely lousy
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233 print 'diff', self.left, self.right
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diff changeset
234 if self.left_only:
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235 self.left_only.sort()
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236 print 'Only in', self.left, ':', self.left_only
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diff changeset
237 if self.right_only:
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diff changeset
238 self.right_only.sort()
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239 print 'Only in', self.right, ':', self.right_only
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diff changeset
240 if self.same_files:
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241 self.same_files.sort()
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242 print 'Identical files :', self.same_files
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diff changeset
243 if self.diff_files:
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244 self.diff_files.sort()
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245 print 'Differing files :', self.diff_files
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diff changeset
246 if self.funny_files:
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247 self.funny_files.sort()
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248 print 'Trouble with common files :', self.funny_files
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diff changeset
249 if self.common_dirs:
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250 self.common_dirs.sort()
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251 print 'Common subdirectories :', self.common_dirs
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diff changeset
252 if self.common_funny:
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diff changeset
253 self.common_funny.sort()
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diff changeset
254 print 'Common funny cases :', self.common_funny
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diff changeset
255
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diff changeset
256 def report_partial_closure(self): # Print reports on self and on subdirs
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diff changeset
257 self.report()
23634
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258 for sd in self.subdirs.itervalues():
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259 print
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260 sd.report()
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261
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262 def report_full_closure(self): # Report on self and subdirs recursively
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263 self.report()
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264 for sd in self.subdirs.itervalues():
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265 print
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266 sd.report_full_closure()
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267
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268
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269 def cmpfiles(a, b, common, shallow=1, use_statcache=None):
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270 """Compare common files in two directories.
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271
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272 a, b -- directory names
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273 common -- list of file names found in both directories
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274 shallow -- if true, do comparison based solely on stat() information
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275 use_statcache -- obsolete argument
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276
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277 Returns a tuple of three lists:
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278 files that compare equal
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279 files that are different
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280 filenames that aren't regular files.
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281
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282 """
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283 if use_statcache is not None:
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284 warnings.warn("use_statcache argument is deprecated",
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285 DeprecationWarning)
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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)].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):
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301 try:
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302 return not abs(cmp(a, b, sh))
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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.GetoptError('need exactly two args', None)
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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()