Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/treesum.py @ 146:7d8df8311e3b

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Optimize argument parsing for the "version" command
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 03 Jan 2025 16:32:40 +0100
parents 073e0faea599
children ed35f3c9e2b5
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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
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33 def _populate_generate_arguments(gp):
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34 """Use to populate command aliases.
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35
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36 This is because :class:`argparse.ArgumentParser` does not
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37 support them for all supported Python versions.
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38
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39 """
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40 gp.add_argument(
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41 "--algorithm", "-a", action="store", type=util.argv2algo,
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42 help="1 (aka sha1), 224, 256, 384, 512, "
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43 "3 (alias for sha3-512), 3-224, 3-256, 3-384, 3-512, "
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44 "blake2b, blake2b-256 (default), blake2s, "
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45 "blake2 (alias for blake2b), "
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46 "blake2-256 (alias for blake2b-256), "
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47 "md5")
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48 gp.add_argument(
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49 "--append-output", action="store_true", dest="append_output",
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50 help="Append to the output file instead of overwriting it.")
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51 gp.add_argument(
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52 "--base64", action="store_true",
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53 help="Output checksums in base64 notation, not hexadecimal "
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54 "(OpenBSD).")
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55 gp.add_argument(
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56 "--comment", action="append", default=[],
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57 help="Put given comment COMMENT into the output as \"COMMENT\". "
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58 "Can be given more than once.")
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59 gp.add_argument(
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60 "--follow-directory-symlinks", "-l", action="store_true",
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61 dest="follow_directory_symlinks",
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62 help="Follow symbolic links to directories when walking a "
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63 "directory tree. Note that this is different from using "
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64 "\"--logical\" or \"--physical\" for arguments given "
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65 "directly on the command line")
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66 gp.add_argument(
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67 "--logical", "-L", dest="logical", action="store_true",
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68 default=None,
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69 help="Follow symbolic links given on command line arguments."
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70 " Note that this is a different setting as to follow symbolic"
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71 " links to directories when traversing a directory tree.")
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72 gp.add_argument(
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73 "--mmap", action="store_true", dest="mmap", default=None,
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74 help="Use mmap if available. Default is to determine "
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75 "automatically from the filesize.")
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76 gp.add_argument(
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77 "--no-mmap", action="store_false", dest="mmap", default=None,
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78 help="Dont use mmap.")
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79 gp.add_argument(
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80 "--output", "-o", action="store", metavar="OUTPUT",
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81 help="Put the checksum into given file. "
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82 "If not given or if it is given as `-' then stdout is used.")
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83 gp.add_argument(
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84 "--physical", "-P", dest="logical", action="store_false",
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85 default=None,
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86 help="Do not follow symbolic links given on comment line "
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87 "arguments. This is the default.")
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88 gp.add_argument(
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89 "directories", nargs="*", metavar="DIRECTORY")
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90
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91 parser = argparse.ArgumentParser(
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92 description="Generate and verify checksums for directory trees.",
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93 fromfile_prefix_chars='@')
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94
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95 # Global options for all sub-commands
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96 parser.add_argument(
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97 "-v", "--version", action="version",
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98 version="%s (rv:%s)" % (__version__, __revision__))
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99
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100 subparsers = parser.add_subparsers(
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101 dest="subcommand",
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102 title="Commands",
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103 description="This tool uses subcommands. "
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104 "To see detailed help for a specific subcommand use "
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105 "the -h/--help option after the subcommand name. "
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106 "A short list of valid commands are listed below:",
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107 metavar="COMMAND")
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108
142
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109 genparser = subparsers.add_parser(
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110 "generate",
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111 help="Generate checksums for directory trees.",
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112 description="Generate checksums for directory trees")
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113 _populate_generate_arguments(genparser)
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114 # And an alias for "generate"
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115 genparser2 = subparsers.add_parser(
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116 "gen",
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117 help="Alias for \"generate\"",
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118 description="Generate checksums for directory trees. "
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119 "This is an alias to \"generate\".")
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120 _populate_generate_arguments(genparser2)
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121
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122 subparsers.add_parser(
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123 "version",
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124 help="Show the program's version number and exit",
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125 description="Show the program's version number and exit.")
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126
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127 # Parse leniently to just check for "version"
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128 opts, _dummy = parser.parse_known_args(args=argv)
124
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129
144
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130 if opts.subcommand == "version":
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131 print("%s (rv:%s)" % (__version__, __revision__),
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132 file=sys.stdout)
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133 sys.exit(0)
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134
146
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135 # Reparse strictly
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136 opts = parser.parse_args(args=argv)
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137
124
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138 if not opts.algorithm:
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139 opts.algorithm = util.argv2algo("blake2b-256")
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140
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141 return treesum(opts)
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142
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143
142
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144 def gen_generate_opts(directories=[],
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145 algorithm="BLAKE2b-256",
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146 append_output=False,
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147 base64=False,
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148 comment=[],
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149 follow_directory_symlinks=False,
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150 logical=None,
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151 mmap=None,
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152 output=None):
131
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153 opts = argparse.Namespace(
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154 directories=directories,
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155 algorithm=(util.algotag2algotype(algorithm),
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156 algorithm),
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157 append_output=append_output,
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158 base64=base64,
135
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159 comment=comment,
131
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160 follow_directory_symlinks=follow_directory_symlinks,
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161 logical=logical,
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162 mmap=mmap,
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163 output=output)
124
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164 return opts
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165
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166
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167 def treesum(opts):
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168 # XXX TBD: opts.check and opts.checklist (as in shasum.py)
142
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169 if opts.subcommand in ("generate", "gen"):
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170 return generate_treesum(opts)
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171 else:
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172 raise RuntimeError(
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173 "command `{}' not yet handled".format(opts.subcommand))
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174
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175
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176 def generate_treesum(opts):
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177 if not opts.directories:
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178 opts.directories.append(".")
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179
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180 if opts.output is None or opts.output == "-":
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181 if hasattr(sys.stdout, "buffer"):
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182 out_cm = cm.nullcontext(sys.stdout.buffer)
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183 else:
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184 out_cm = cm.nullcontext(sys.stdout)
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185 else:
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186 if opts.append_output:
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187 out_cm = open(opts.output, "ab")
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188 else:
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189 out_cm = open(opts.output, "wb")
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190
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191 with out_cm as outfp:
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192 for d in opts.directories:
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193 generate_treesum_for_directory(
131
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194 outfp, d, opts.algorithm, opts.mmap, opts.base64, opts.logical,
135
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195 opts.follow_directory_symlinks,
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196 comment=opts.comment)
124
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197
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198
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199 def generate_treesum_for_directory(
131
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200 outfp, root, algorithm, use_mmap, use_base64, handle_root_logical,
135
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201 follow_directory_symlinks, comment=None):
124
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202 """
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203
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204 :param outfp: a *binary* file with a "write()" and a "flush()" method
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205
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206 """
134
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207 outfp.write(format_bsd_line("VERSION", "1", None, False))
124
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208 outfp.flush()
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209
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210 # Note given non-default flags that are relevant for directory traversal
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211 flags = []
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212 if handle_root_logical:
129
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213 flags.append("logical")
131
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214 if follow_directory_symlinks:
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215 flags.append("follow-directory-symlinks")
125
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216 if flags:
129
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217 outfp.write(format_bsd_line("FLAGS", ",".join(flags), None, False))
134
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218 outfp.flush()
125
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219
128
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220 # Write execution timestamps in POSIX epoch and ISO format
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221 ts = time.time()
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222 outfp.write(format_bsd_line("TIMESTAMP", ts, None, False))
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223 ts = (datetime.datetime.utcfromtimestamp(ts)).isoformat("T")
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224 outfp.write(format_bsd_line("ISOTIMESTAMP", ts, None, False))
134
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225 outfp.flush()
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226
135
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227 if comment:
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228 for line in comment:
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229 outfp.write(format_bsd_line("COMMENT", None, line, False))
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230 outfp.write(format_bsd_line("ROOT", None, root, False))
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231 outfp.flush()
128
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diff changeset
232
124
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233 dir_digests = {}
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234
125
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235 if not handle_root_logical and os.path.islink(root):
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236 linktgt = util.fsencode(os.readlink(root))
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237 linkdgst = algorithm[0]()
132
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238 linkdgst.update(b"%d:%s," % (len(linktgt), linktgt))
125
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diff changeset
239 dir_dgst = algorithm[0]()
137
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240 dir_dgst.update(b"1:L,")
125
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241 dir_dgst.update(linkdgst.digest())
133
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242 outfp.write(
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243 format_bsd_line(
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244 algorithm[1],
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245 dir_dgst.digest(),
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246 "./@",
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247 use_base64))
125
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diff changeset
248 outfp.flush()
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diff changeset
249 return
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diff changeset
250
131
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251 for top, dirs, nondirs in walk.walk(
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diff changeset
252 root,
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diff changeset
253 follow_symlinks=follow_directory_symlinks):
124
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254 dir_dgst = algorithm[0]()
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255 for dn in dirs:
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256 if dn.is_symlink and not follow_directory_symlinks:
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257 linktgt = util.fsencode(os.readlink(dn.path))
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258 linkdgst = algorithm[0]()
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259 linkdgst.update(b"%d:%s," % (len(linktgt), linktgt))
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260 dir_dgst.update(b"1:S,%d:%s," % (len(dn.fsname), dn.fsname))
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261 dir_dgst.update(linkdgst.digest())
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262 opath = "/".join(top) + "/" + dn.name if top else dn.name
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263 outfp.write(
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264 format_bsd_line(
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265 algorithm[1],
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266 linkdgst.digest(),
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267 "%s/./@" % (opath,),
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268 use_base64))
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269 outfp.flush()
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270 continue
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271 # fetch from dir_digests
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272 dgst = dir_digests[top + (dn.name,)]
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273 dir_dgst.update(b"1:d,%d:%s," % (len(dn.fsname), dn.fsname))
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274 dir_dgst.update(dgst)
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275 for fn in nondirs:
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276 dir_dgst.update(b"1:f,%d:%s," % (len(fn.fsname), fn.fsname))
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277 dgst = digest.compute_digest_file(
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278 algorithm[0], fn.path, use_mmap=use_mmap)
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279 dir_dgst.update(dgst)
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280 opath = "/".join(top) + "/" + fn.name if top else fn.name
133
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281 outfp.write(
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282 format_bsd_line(
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283 algorithm[1], dgst, opath, use_base64))
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284 outfp.flush()
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285 opath = "/".join(top) + "/" if top else ""
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286 outfp.write(format_bsd_line(
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287 algorithm[1], dir_dgst.digest(), opath, use_base64))
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288 outfp.flush()
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289 dir_digests[top] = dir_dgst.digest()
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290
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291
128
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292 def format_bsd_line(digestname, value, filename, use_base64):
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293 ls = os.linesep if isinstance(os.linesep, bytes) \
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294 else os.linesep.encode("utf-8")
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295 if not isinstance(digestname, bytes):
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296 digestname = digestname.encode("ascii")
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297 if digestname == b"TIMESTAMP":
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298 assert filename is None
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299 return b"TIMESTAMP = %d%s" % (value, ls)
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300 if digestname in (b"ISOTIMESTAMP", b"FLAGS", b"VERSION"):
129
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301 assert filename is None
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302 if not isinstance(value, bytes):
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303 value = value.encode("ascii")
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304 return b"%s = %s%s" % (digestname, value, ls)
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305 assert filename is not None
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306 if digestname == b"COMMENT":
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307 if not isinstance(filename, bytes):
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308 filename = filename.encode("utf-8")
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309 return b"COMMENT (%s)%s" % (filename, ls)
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310 if not isinstance(filename, bytes):
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311 filename = util.fsencode(filename)
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312 if value is None:
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313 return b"%s (%s)%s" % (digestname, filename, ls)
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314 if use_base64:
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315 value = base64.b64encode(value)
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316 else:
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317 value = binascii.hexlify(value)
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318 if filename != b"./@":
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319 filename = util.normalize_filename(filename, True)
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320 return b"%s (%s) = %s%s" % (digestname, filename, value, ls)
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321
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322
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323 if __name__ == "__main__":
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324 sys.exit(main())