Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/treesum.py @ 137:69f8a3db8fbd

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Change the tag for symlinks given on the command line: no "filename" here
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 02 Jan 2025 23:40:05 +0100
parents db4fd1f64538
children 71747e45b52c
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2020-2025 Franz Glasner
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4 # :License: BSD-3-Clause
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5 # :-
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6 r"""Generate and verify checksums for directory trees.
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7
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8 """
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9
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10 from __future__ import print_function, absolute_import
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11
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12
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13 __all__ = []
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14
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15
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16 import argparse
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17 import base64
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18 import binascii
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19 import datetime
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20 import os
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21 import sys
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22 import time
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23
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24 from . import (__version__, __revision__)
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25 from . import util
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26 from .util import cm
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27 from .util import digest
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28 from .util import walk
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31 def main(argv=None):
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32 aparser = argparse.ArgumentParser(
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33 description="Generate checksums for directory trees",
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34 fromfile_prefix_chars='@')
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35 aparser.add_argument(
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36 "--algorithm", "-a", action="store", type=util.argv2algo,
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37 help="1 (aka sha1), 224, 256, 384, 512, "
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38 "3 (alias for sha3-512), 3-224, 3-256, 3-384, 3-512, "
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39 "blake2b, blake2b-256 (default), blake2s, "
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40 "blake2 (alias for blake2b), blake2-256 (alias for blake2b-256), "
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41 "md5")
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42 aparser.add_argument(
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43 "--append-output", action="store_true", dest="append_output",
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44 help="Append to the output file instead of overwriting it.")
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45 aparser.add_argument(
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46 "--base64", action="store_true",
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47 help="Output checksums in base64 notation, not hexadecimal (OpenBSD).")
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48 aparser.add_argument(
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49 "--comment", action="append", default=[],
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50 help="Put given comment COMMENT into the output as \"COMMENT\"."
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51 " Can be given more than once.")
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52 aparser.add_argument(
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53 "--follow-directory-symlinks", "-l", action="store_true",
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54 dest="follow_directory_symlinks",
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55 help="Follow symbolic links to directories when walking a directory"
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56 " tree. Note that this is different from using \"--logical\" or"
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57 " \"--physical\" for arguments given directly on the command"
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58 " line")
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59 aparser.add_argument(
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60 "--logical", "-L", dest="logical", action="store_true", default=None,
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61 help="Follow symbolic links given on command line arguments."
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62 " Note that this is a different setting as to follow symbolic"
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63 " links to directories when traversing a directory tree.")
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64 aparser.add_argument(
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65 "--mmap", action="store_true", dest="mmap", default=None,
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66 help="Use mmap if available. Default is to determine automatically "
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67 "from the filesize.")
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68 aparser.add_argument(
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69 "--no-mmap", action="store_false", dest="mmap", default=None,
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70 help="Dont use mmap.")
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71 aparser.add_argument(
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72 "--output", "-o", action="store", metavar="OUTPUT",
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73 help="Put the checksum into given file. If not given of if it is given"
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74 " as `-' then stdout is used.")
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75 aparser.add_argument(
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76 "--physical", "-P", dest="logical", action="store_false", default=None,
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77 help="Do not follow symbolic links given on comment line arguments."
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78 " This is the default.")
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79 aparser.add_argument(
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80 "--version", "-v", action="version",
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81 version="%s (rv:%s)" % (__version__, __revision__))
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82 aparser.add_argument(
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83 "directories", nargs="*", metavar="DIRECTORY")
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84
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85 opts = aparser.parse_args(args=argv)
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86
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87 if not opts.algorithm:
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88 opts.algorithm = util.argv2algo("blake2b-256")
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89
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90 return treesum(opts)
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91
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92
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93 def gen_opts(directories=[],
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94 algorithm="BLAKE2b-256",
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95 append_output=False,
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96 base64=False,
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97 comment=[],
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98 follow_directory_symlinks=False,
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99 logical=None,
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100 mmap=None,
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101 output=None):
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102 opts = argparse.Namespace(
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103 directories=directories,
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104 algorithm=(util.algotag2algotype(algorithm),
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105 algorithm),
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106 append_output=append_output,
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107 base64=base64,
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108 comment=comment,
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109 follow_directory_symlinks=follow_directory_symlinks,
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110 logical=logical,
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111 mmap=mmap,
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112 output=output)
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113 return opts
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114
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115
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116 def treesum(opts):
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117 # XXX TBD: opts.check and opts.checklist (as in shasum.py)
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118 return generate_treesum(opts)
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119
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120
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121 def generate_treesum(opts):
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122 if not opts.directories:
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123 opts.directories.append(".")
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124
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125 if opts.output is None or opts.output == "-":
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126 if hasattr(sys.stdout, "buffer"):
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127 out_cm = cm.nullcontext(sys.stdout.buffer)
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128 else:
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129 out_cm = cm.nullcontext(sys.stdout)
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130 else:
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131 if opts.append_output:
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132 out_cm = open(opts.output, "ab")
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133 else:
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134 out_cm = open(opts.output, "wb")
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135
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136 with out_cm as outfp:
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137 for d in opts.directories:
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138 generate_treesum_for_directory(
131
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139 outfp, d, opts.algorithm, opts.mmap, opts.base64, opts.logical,
135
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140 opts.follow_directory_symlinks,
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141 comment=opts.comment)
124
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142
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143
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144 def generate_treesum_for_directory(
131
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145 outfp, root, algorithm, use_mmap, use_base64, handle_root_logical,
135
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146 follow_directory_symlinks, comment=None):
124
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147 """
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148
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149 :param outfp: a *binary* file with a "write()" and a "flush()" method
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150
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151 """
134
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152 outfp.write(format_bsd_line("VERSION", "1", None, False))
124
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153 outfp.flush()
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154
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155 # Note given non-default flags that are relevant for directory traversal
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156 flags = []
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157 if handle_root_logical:
129
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158 flags.append("logical")
131
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159 if follow_directory_symlinks:
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160 flags.append("follow-directory-symlinks")
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161 if flags:
129
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162 outfp.write(format_bsd_line("FLAGS", ",".join(flags), None, False))
134
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163 outfp.flush()
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164
128
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165 # Write execution timestamps in POSIX epoch and ISO format
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166 ts = time.time()
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167 outfp.write(format_bsd_line("TIMESTAMP", ts, None, False))
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168 ts = (datetime.datetime.utcfromtimestamp(ts)).isoformat("T")
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169 outfp.write(format_bsd_line("ISOTIMESTAMP", ts, None, False))
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170 outfp.flush()
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171
135
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172 if comment:
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173 for line in comment:
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174 outfp.write(format_bsd_line("COMMENT", None, line, False))
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175 outfp.write(format_bsd_line("ROOT", None, root, False))
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176 outfp.flush()
128
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diff changeset
177
124
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178 dir_digests = {}
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179
125
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180 if not handle_root_logical and os.path.islink(root):
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181 linktgt = util.fsencode(os.readlink(root))
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diff changeset
182 linkdgst = algorithm[0]()
132
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183 linkdgst.update(b"%d:%s," % (len(linktgt), linktgt))
125
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184 dir_dgst = algorithm[0]()
137
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185 dir_dgst.update(b"1:L,")
125
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186 dir_dgst.update(linkdgst.digest())
133
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187 outfp.write(
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188 format_bsd_line(
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189 algorithm[1],
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190 dir_dgst.digest(),
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191 "./@",
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diff changeset
192 use_base64))
125
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193 outfp.flush()
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diff changeset
194 return
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diff changeset
195
131
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diff changeset
196 for top, dirs, nondirs in walk.walk(
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diff changeset
197 root,
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diff changeset
198 follow_symlinks=follow_directory_symlinks):
124
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199 dir_dgst = algorithm[0]()
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200 for dn in dirs:
131
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201 if dn.is_symlink and not follow_directory_symlinks:
124
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202 linktgt = util.fsencode(os.readlink(dn.path))
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203 linkdgst = algorithm[0]()
132
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204 linkdgst.update(b"%d:%s," % (len(linktgt), linktgt))
124
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205 dir_dgst.update(b"1:S,%d:%s," % (len(dn.fsname), dn.fsname))
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206 dir_dgst.update(linkdgst.digest())
127
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diff changeset
207 opath = "/".join(top) + "/" + dn.name if top else dn.name
124
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208 outfp.write(
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209 format_bsd_line(
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210 algorithm[1],
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diff changeset
211 linkdgst.digest(),
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212 "%s/./@" % (opath,),
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213 use_base64))
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214 outfp.flush()
131
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diff changeset
215 continue
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216 # fetch from dir_digests
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diff changeset
217 dgst = dir_digests[top + (dn.name,)]
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diff changeset
218 dir_dgst.update(b"1:d,%d:%s," % (len(dn.fsname), dn.fsname))
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diff changeset
219 dir_dgst.update(dgst)
124
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diff changeset
220 for fn in nondirs:
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diff changeset
221 dir_dgst.update(b"1:f,%d:%s," % (len(fn.fsname), fn.fsname))
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diff changeset
222 dgst = digest.compute_digest_file(
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diff changeset
223 algorithm[0], fn.path, use_mmap=use_mmap)
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diff changeset
224 dir_dgst.update(dgst)
127
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diff changeset
225 opath = "/".join(top) + "/" + fn.name if top else fn.name
133
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diff changeset
226 outfp.write(
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diff changeset
227 format_bsd_line(
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diff changeset
228 algorithm[1], dgst, opath, use_base64))
124
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229 outfp.flush()
127
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diff changeset
230 opath = "/".join(top) + "/" if top else ""
124
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231 outfp.write(format_bsd_line(
127
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diff changeset
232 algorithm[1], dir_dgst.digest(), opath, use_base64))
124
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diff changeset
233 outfp.flush()
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diff changeset
234 dir_digests[top] = dir_dgst.digest()
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235
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236
128
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diff changeset
237 def format_bsd_line(digestname, value, filename, use_base64):
124
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diff changeset
238 ls = os.linesep if isinstance(os.linesep, bytes) \
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239 else os.linesep.encode("utf-8")
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240 if not isinstance(digestname, bytes):
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diff changeset
241 digestname = digestname.encode("ascii")
128
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diff changeset
242 if digestname == b"TIMESTAMP":
129
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diff changeset
243 assert filename is None
128
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244 return b"TIMESTAMP = %d%s" % (value, ls)
134
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diff changeset
245 if digestname in (b"ISOTIMESTAMP", b"FLAGS", b"VERSION"):
129
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diff changeset
246 assert filename is None
128
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diff changeset
247 if not isinstance(value, bytes):
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diff changeset
248 value = value.encode("ascii")
129
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diff changeset
249 return b"%s = %s%s" % (digestname, value, ls)
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diff changeset
250 assert filename is not None
135
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251 if digestname == b"COMMENT":
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252 if not isinstance(filename, bytes):
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253 filename = filename.encode("utf-8")
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254 return b"COMMENT (%s)%s" % (filename, ls)
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255 if not isinstance(filename, bytes):
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256 filename = util.fsencode(filename)
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257 if value is None:
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258 return b"%s (%s)%s" % (digestname, filename, ls)
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259 if use_base64:
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260 value = base64.b64encode(value)
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261 else:
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262 value = binascii.hexlify(value)
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263 if filename != b"./@":
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264 filename = util.normalize_filename(filename, True)
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265 return b"%s (%s) = %s%s" % (digestname, filename, value, ls)
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266
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267
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268 if __name__ == "__main__":
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269 sys.exit(main())