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annotate roundup/install_util.py @ 383:a213e2a90364

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Added install utils (digest calculation)
author Jürgen Hermann <jhermann@users.sourceforge.net>
date Mon, 12 Nov 2001 22:26:32 +0000
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children a72ad731b2cb
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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 1.1 2001-11-12 22:26:32 jhermann Exp $
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19
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20 import os, sha
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23 def checkDigest(filename):
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24 """Read file, check for valid fingerprint, return TRUE if ok"""
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25 # open and read file
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26 inp = open(filename, "r")
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27 lines = inp.readlines()
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28 inp.close()
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29
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30 # get fingerprint from last line
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31 if lines[-1][:6] == "#SHA: ":
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32 # handle .py/.sh comment
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33 fingerprint = lines[-1][6:].strip()
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34 elif lines[-1][:10] == "<!-- SHA: ":
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35 # handle xml files
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36 fingerprint = lines[-1][10:]
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37 fingerprint = fingerprint.replace('-->', '')
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38 fingerprint = fingerprint.strip()
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39 else:
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40 return 0
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41 del lines[-1]
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42
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43 # calculate current digest
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44 digest = sha.new()
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45 for line in lines:
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46 digest.update(line)
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47
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48 # compare current to stored digest
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49 return fingerprint == digest.hexdigest()
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51
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52 class DigestFile:
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53 """ A class that you can use like open() and that calculates
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54 and writes a SHA digest to the target file.
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55 """
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56
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57 def __init__(self, filename):
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58 self.filename = filename
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59 self.digest = sha.new()
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60 self.file = open(self.filename, "w")
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61
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62 def write(self, data):
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63 self.file.write(data)
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64 self.digest.update(data)
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65
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66 def close(self):
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67 file, ext = os.path.splitext(self.filename)
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68
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69 if ext in [".xml", ".ent"]:
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70 self.file.write("<!-- SHA: %s -->\n" % (self.digest.hexdigest(),))
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71 elif ext in [".py", ".sh", ".conf", '']:
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72 self.file.write("#SHA: %s\n" % (self.digest.hexdigest(),))
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73
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74 self.file.close()
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76
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77 def test():
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78 import sys
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79
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80 testdata = open(sys.argv[0], 'r').read()
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81 testfile = "digest_test.py"
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82
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83 out = DigestFile(testfile)
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84 out.write(testdata)
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85 out.close()
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86
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87 assert checkDigest(testfile), "digest ok w/o modification"
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88
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89 mod = open(testfile, 'r+')
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90 mod.seek(0)
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91 mod.write('# changed!')
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92 mod.close()
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93
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94 assert not checkDigest(testfile), "digest fails after modification"
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95
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96 os.remove(testfile)
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97
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98
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99 if __name__ == '__main__':
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100 test()
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101
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102 #
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103 # $Log: not supported by cvs2svn $
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104
Roundup Issue Tracker: http://roundup-tracker.org/