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annotate roundup/install_util.py @ 8513:d7d91e25a1c2

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chore(build): bump anchore/scan-action from 7.2.3 to 7.3.0 pull #80
author John Rouillard <rouilj@ieee.org>
date Tue, 27 Jan 2026 21:41:37 -0500
parents 8e118eb20d86
children
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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
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24 import shutil
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25 from hashlib import sha1
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27 from roundup.anypy.strings import s2b
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28
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29 sgml_file_types = [".xml", ".ent", ".html"]
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30 hash_file_types = [".py", ".sh", ".conf", ".cgi"]
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31 slast_file_types = [".css"]
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32
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33 digested_file_types = sgml_file_types + hash_file_types + slast_file_types
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34
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35
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36 def extractFingerprint(lines):
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37 # get fingerprint from last line
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38 if lines[-1].startswith(b"#SHA: "):
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39 # handle .py/.sh comment
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40 return lines[-1][6:].strip()
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41 elif lines[-1].startswith(b"<!-- SHA: "):
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42 # handle xml/html files
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43 fingerprint = lines[-1][10:]
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44 fingerprint = fingerprint.replace(b'-->', b'')
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45 return fingerprint.strip()
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46 elif lines[-1].startswith(b"/* SHA: "):
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47 # handle css files
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48 fingerprint = lines[-1][8:]
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49 fingerprint = fingerprint.replace(b'*/', b'')
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50 return fingerprint.strip()
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51 return None
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52
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53
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54 def checkDigest(filename):
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55 """Read file, check for valid fingerprint, return TRUE if ok"""
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56 # open and read file
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57 inp = open(filename, "rb")
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58 lines = inp.readlines()
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59 inp.close()
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60
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61 fingerprint = extractFingerprint(lines)
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62 if fingerprint is None:
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63 return 0
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64 del lines[-1]
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66 # calculate current digest
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67 digest = sha1()
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68 for line in lines:
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69 digest.update(line)
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71 # compare current to stored digest
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72 return fingerprint == s2b(digest.hexdigest())
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74
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75 class DigestFile:
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76 """ A class that you can use like open() and that calculates
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77 and writes a SHA digest to the target file.
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78 """
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79
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80 def __init__(self, filename):
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81 self.filename = filename
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82 self.digest = sha1()
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83 self.file = open(self.filename, "wb")
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84
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85 def write(self, data):
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86 lines = data.splitlines()
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87 # if the file is coming from an installed tracker being used as a
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88 # template, then we will want to re-calculate the SHA
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89 fingerprint = extractFingerprint(lines)
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90 if fingerprint is not None:
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91 data = b'\n'.join(lines[:-1]) + b'\n'
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92 self.file.write(data)
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93 self.digest.update(data)
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94
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95 def close(self):
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96 file, ext = os.path.splitext(self.filename)
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97
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98 if ext in sgml_file_types:
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99 self.file.write(s2b("<!-- SHA: %s -->\n" %
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100 (self.digest.hexdigest(),)))
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101 elif ext in hash_file_types:
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102 self.file.write(s2b("#SHA: %s\n" % (self.digest.hexdigest(),)))
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103 elif ext in slast_file_types:
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104 self.file.write(s2b("/* SHA: %s */\n" %
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105 (self.digest.hexdigest(),)))
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106
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107 self.file.close()
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108
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109
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110 def copyDigestedFile(src, dst, copystat=1):
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111 """ Copy data from `src` to `dst`, adding a fingerprint to `dst`.
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112 If `copystat` is true, the file status is copied, too
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113 (like shutil.copy2).
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114 """
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115 if os.path.isdir(dst):
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116 dst = os.path.join(dst, os.path.basename(src))
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117
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118 dummy, ext = os.path.splitext(src)
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119 if ext not in digested_file_types:
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120 if copystat:
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121 return shutil.copy2(src, dst)
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122 else:
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123 return shutil.copyfile(src, dst)
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124
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125 fsrc = None
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126 fdst = None
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127 try:
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128 fsrc = open(src, 'rb')
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129 fdst = DigestFile(dst)
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130 shutil.copyfileobj(fsrc, fdst)
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131 finally:
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132 if fdst: fdst.close()
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133 if fsrc: fsrc.close()
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134
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135 if copystat: shutil.copystat(src, dst)
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137
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138 def test():
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139 import sys
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140
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141 testdata = open(sys.argv[0], 'rb').read()
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142
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143 for ext in digested_file_types:
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144 testfile = "__digest_test" + ext
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145
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146 out = DigestFile(testfile)
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147 out.write(testdata)
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148 out.close()
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149
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150 assert checkDigest(testfile), "digest ok w/o modification"
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151
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152 mod = open(testfile, 'r+b')
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153 mod.seek(0)
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154 mod.write('# changed!')
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155 mod.close()
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156
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157 assert not checkDigest(testfile), "digest fails after modification"
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158
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159 os.remove(testfile)
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161
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162 if __name__ == '__main__':
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163 test()
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164
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165 # vim: set filetype=python ts=4 sw=4 et si
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