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annotate roundup/install_util.py @ 4982:9ba03348f923

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Remove roundup/anypy/hashlib_.py The hashlib_ module was being used to provide backwards compatibility for python v2.4. Roundup has dropped support for python v2.4 so we can get rid of it.
author John Kristensen <john@jerrykan.com>
date Fri, 09 May 2014 17:32:44 +1000
parents 6e3e4f24c753
children 88cf5614e0f4
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18
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19 """Support module to generate and check fingerprints of installed files.
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20 """
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21 __docformat__ = 'restructuredtext'
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22
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23 import os, shutil
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24 from hashlib import sha1
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25
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26 sgml_file_types = [".xml", ".ent", ".html"]
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27 hash_file_types = [".py", ".sh", ".conf", ".cgi"]
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28 slast_file_types = [".css"]
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29
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30 digested_file_types = sgml_file_types + hash_file_types + slast_file_types
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31
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32 def extractFingerprint(lines):
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33 # get fingerprint from last line
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34 if lines[-1].startswith("#SHA: "):
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35 # handle .py/.sh comment
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36 return lines[-1][6:].strip()
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37 elif lines[-1].startswith("<!-- SHA: "):
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38 # handle xml/html files
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39 fingerprint = lines[-1][10:]
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40 fingerprint = fingerprint.replace('-->', '')
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41 return fingerprint.strip()
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42 elif lines[-1].startswith("/* SHA: "):
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43 # handle css files
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44 fingerprint = lines[-1][8:]
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45 fingerprint = fingerprint.replace('*/', '')
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46 return fingerprint.strip()
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47 return None
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48
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49 def checkDigest(filename):
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50 """Read file, check for valid fingerprint, return TRUE if ok"""
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51 # open and read file
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52 inp = open(filename, "r")
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53 lines = inp.readlines()
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54 inp.close()
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55
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56 fingerprint = extractFingerprint(lines)
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57 if fingerprint is None:
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58 return 0
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59 del lines[-1]
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60
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61 # calculate current digest
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62 digest = sha1()
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63 for line in lines:
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64 digest.update(line)
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65
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66 # compare current to stored digest
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67 return fingerprint == digest.hexdigest()
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69
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70 class DigestFile:
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71 """ A class that you can use like open() and that calculates
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72 and writes a SHA digest to the target file.
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73 """
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74
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75 def __init__(self, filename):
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76 self.filename = filename
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77 self.digest = sha1()
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78 self.file = open(self.filename, "w")
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79
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80 def write(self, data):
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81 lines = data.splitlines()
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82 # if the file is coming from an installed tracker being used as a
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83 # template, then we will want to re-calculate the SHA
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84 fingerprint = extractFingerprint(lines)
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85 if fingerprint is not None:
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86 data = '\n'.join(lines[:-1]) + '\n'
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87 self.file.write(data)
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88 self.digest.update(data)
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89
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90 def close(self):
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91 file, ext = os.path.splitext(self.filename)
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92
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93 if ext in sgml_file_types:
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94 self.file.write("<!-- SHA: %s -->\n" % (self.digest.hexdigest(),))
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95 elif ext in hash_file_types:
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96 self.file.write("#SHA: %s\n" % (self.digest.hexdigest(),))
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97 elif ext in slast_file_types:
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98 self.file.write("/* SHA: %s */\n" % (self.digest.hexdigest(),))
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99
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100 self.file.close()
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101
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102
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103 def copyDigestedFile(src, dst, copystat=1):
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104 """ Copy data from `src` to `dst`, adding a fingerprint to `dst`.
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105 If `copystat` is true, the file status is copied, too
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106 (like shutil.copy2).
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107 """
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108 if os.path.isdir(dst):
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109 dst = os.path.join(dst, os.path.basename(src))
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110
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111 dummy, ext = os.path.splitext(src)
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112 if ext not in digested_file_types:
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113 if copystat:
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114 return shutil.copy2(src, dst)
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115 else:
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116 return shutil.copyfile(src, dst)
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117
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118 fsrc = None
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119 fdst = None
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120 try:
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121 fsrc = open(src, 'r')
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122 fdst = DigestFile(dst)
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123 shutil.copyfileobj(fsrc, fdst)
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124 finally:
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125 if fdst: fdst.close()
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126 if fsrc: fsrc.close()
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127
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128 if copystat: shutil.copystat(src, dst)
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129
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130
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131 def test():
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132 import sys
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133
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134 testdata = open(sys.argv[0], 'r').read()
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135
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136 for ext in digested_file_types:
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137 testfile = "__digest_test" + ext
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139 out = DigestFile(testfile)
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140 out.write(testdata)
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141 out.close()
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143 assert checkDigest(testfile), "digest ok w/o modification"
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145 mod = open(testfile, 'r+')
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146 mod.seek(0)
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147 mod.write('# changed!')
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148 mod.close()
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150 assert not checkDigest(testfile), "digest fails after modification"
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151
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152 os.remove(testfile)
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154
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155 if __name__ == '__main__':
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156 test()
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157
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158 # vim: set filetype=python ts=4 sw=4 et si
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