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91 lines
2.7 KiB
Python
Executable File
91 lines
2.7 KiB
Python
Executable File
#! /usr/bin/env python
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# Copyright (C) 2008-2009 by Guy Rutenberg
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the
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# Free Software Foundation, Inc.,
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# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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import hashlib
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import tarfile
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def tarsum(input_file, hash, output_file):
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"""
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input_file - A FILE object to read the tar file from.
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hash - The name of the hash to use. Must be supported by hashlib.
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output_file - A FILE to write the computed signatures to.
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"""
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tar = tarfile.open(mode="r|*", fileobj=input_file)
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chunk_size = 100 * 1024
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store_digests = {}
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for member in tar:
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if not member.isfile():
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continue
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f = tar.extractfile(member)
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h = hashlib.new(hash)
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data = f.read(chunk_size)
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while data:
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h.update(data)
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data = f.read(chunk_size)
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output_file.write("%s %s\n" % (h.hexdigest(), member.name))
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def main():
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parser = OptionParser()
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version = (
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"%prog 0.2.1\n"
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"Copyright (C) 2008-2009 Guy Rutenberg <http://www.guyrutenberg.com/contact-me>"
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)
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usage = ("%prog [options] TARFILE\n"
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"Print a checksum signature for every file in TARFILE.\n"
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"With no FILE, or when FILE is -, read standard input.")
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parser = OptionParser(usage=usage, version=version)
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parser.add_option(
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"-c",
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"--checksum",
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dest="checksum",
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type="string",
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help="use HASH as for caclculating the checksums. [default: %default]",
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metavar="HASH",
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default="md5")
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parser.add_option("-o",
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"--output",
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dest="output",
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type="string",
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help="save signatures to FILE.",
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metavar="FILE")
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(option, args) = parser.parse_args()
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output_file = sys.stdout
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if option.output:
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output_file = open(option.output, "w")
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input_file = sys.stdin
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if len(args) == 1 and args[0] != "-":
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input_file = open(args[0], "r")
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tarsum(input_file, option.checksum, output_file)
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if __name__ == "__main__":
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from optparse import OptionParser
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import sys
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main()
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