Mercurial > p > roundup > code

annotate roundup/install_util.py @ 1780:d2801a2b0a77

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Initial implementation (half-baked) at new Tracker instance. Cleaned up caching API / comments in backends. Fixes to docs.
author Richard Jones <richard@users.sourceforge.net>
date Thu, 04 Sep 2003 00:47:01 +0000
parents 9b910e8d987d
children d19fd344bd1f
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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 # $Id: install_util.py,v 1.8 2002-09-10 00:18:20 richard Exp $
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19
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20 __doc__ = """
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21 Support module to generate and check fingerprints of installed files.
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22 """
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23
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24 import os, sha, shutil
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25
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26 # ".filter", ".index", ".item", ".newitem" are roundup-specific
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27 sgml_file_types = [".xml", ".ent", ".html", ".filter", ".index", ".item", ".newitem"]
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28 hash_file_types = [".py", ".sh", ".conf", ".cgi", '']
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29 slast_file_types = [".css"]
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30
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31 digested_file_types = sgml_file_types + hash_file_types + slast_file_types
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34 def checkDigest(filename):
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35 """Read file, check for valid fingerprint, return TRUE if ok"""
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36 # open and read file
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37 inp = open(filename, "r")
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38 lines = inp.readlines()
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39 inp.close()
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40
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41 # get fingerprint from last line
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42 if lines[-1][:6] == "#SHA: ":
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43 # handle .py/.sh comment
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44 fingerprint = lines[-1][6:].strip()
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45 elif lines[-1][:10] == "<!-- SHA: ":
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46 # handle xml/html files
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47 fingerprint = lines[-1][10:]
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48 fingerprint = fingerprint.replace('-->', '')
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49 fingerprint = fingerprint.strip()
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50 elif lines[-1][:8] == "/* SHA: ":
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51 # handle css files
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52 fingerprint = lines[-1][8:]
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53 fingerprint = fingerprint.replace('*/', '')
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54 fingerprint = fingerprint.strip()
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55 else:
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56 return 0
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57 del lines[-1]
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58
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59 # calculate current digest
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60 digest = sha.new()
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61 for line in lines:
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62 digest.update(line)
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63
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64 # compare current to stored digest
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65 return fingerprint == digest.hexdigest()
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67
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68 class DigestFile:
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69 """ A class that you can use like open() and that calculates
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70 and writes a SHA digest to the target file.
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71 """
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72
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73 def __init__(self, filename):
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74 self.filename = filename
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75 self.digest = sha.new()
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76 self.file = open(self.filename, "w")
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77
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78 def write(self, data):
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79 self.file.write(data)
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80 self.digest.update(data)
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81
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82 def close(self):
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83 file, ext = os.path.splitext(self.filename)
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84
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85 if ext in sgml_file_types:
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86 self.file.write("<!-- SHA: %s -->\n" % (self.digest.hexdigest(),))
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87 elif ext in hash_file_types:
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88 self.file.write("#SHA: %s\n" % (self.digest.hexdigest(),))
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89 elif ext in slast_file_types:
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90 self.file.write("/* SHA: %s */\n" % (self.digest.hexdigest(),))
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91
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92 self.file.close()
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93
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94
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95 def copyDigestedFile(src, dst, copystat=1):
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96 """ Copy data from `src` to `dst`, adding a fingerprint to `dst`.
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97 If `copystat` is true, the file status is copied, too
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98 (like shutil.copy2).
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99 """
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100 if os.path.isdir(dst):
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101 dst = os.path.join(dst, os.path.basename(src))
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102
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103 dummy, ext = os.path.splitext(src)
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104 if ext not in digested_file_types:
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105 if copystat:
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106 return shutil.copy2(src, dst)
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107 else:
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108 return shutil.copyfile(src, dst)
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109
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110 fsrc = None
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111 fdst = None
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112 try:
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113 fsrc = open(src, 'r')
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114 fdst = DigestFile(dst)
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115 shutil.copyfileobj(fsrc, fdst)
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116 finally:
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117 if fdst: fdst.close()
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118 if fsrc: fsrc.close()
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119
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120 if copystat: shutil.copystat(src, dst)
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121
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122
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123 def test():
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124 import sys
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125
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126 testdata = open(sys.argv[0], 'r').read()
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127
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128 for ext in digested_file_types:
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129 testfile = "__digest_test" + ext
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130
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131 out = DigestFile(testfile)
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132 out.write(testdata)
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133 out.close()
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134
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135 assert checkDigest(testfile), "digest ok w/o modification"
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136
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137 mod = open(testfile, 'r+')
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138 mod.seek(0)
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139 mod.write('# changed!')
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140 mod.close()
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142 assert not checkDigest(testfile), "digest fails after modification"
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143
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144 os.remove(testfile)
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145
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146
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147 if __name__ == '__main__':
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148 test()
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149
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150 # vim: set filetype=python ts=4 sw=4 et si
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