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94 lines
2.4 KiB
94 lines
2.4 KiB
6 years ago
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#! /usr/bin/env python3
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"""Python utility to print MD5 checksums of argument files.
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"""
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bufsize = 8096
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fnfilter = None
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rmode = 'rb'
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usage = """
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usage: md5sum.py [-b] [-t] [-l] [-s bufsize] [file ...]
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-b : read files in binary mode (default)
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-t : read files in text mode (you almost certainly don't want this!)
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-l : print last pathname component only
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-s bufsize: read buffer size (default %d)
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file ... : files to sum; '-' or no files means stdin
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""" % bufsize
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import io
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import sys
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import os
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import getopt
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from hashlib import md5
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def sum(*files):
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sts = 0
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if files and isinstance(files[-1], io.IOBase):
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out, files = files[-1], files[:-1]
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else:
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out = sys.stdout
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if len(files) == 1 and not isinstance(files[0], str):
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files = files[0]
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for f in files:
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if isinstance(f, str):
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if f == '-':
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sts = printsumfp(sys.stdin, '<stdin>', out) or sts
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else:
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sts = printsum(f, out) or sts
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else:
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sts = sum(f, out) or sts
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return sts
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def printsum(filename, out=sys.stdout):
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try:
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fp = open(filename, rmode)
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except IOError as msg:
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sys.stderr.write('%s: Can\'t open: %s\n' % (filename, msg))
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return 1
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if fnfilter:
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filename = fnfilter(filename)
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sts = printsumfp(fp, filename, out)
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fp.close()
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return sts
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def printsumfp(fp, filename, out=sys.stdout):
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m = md5()
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try:
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while 1:
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data = fp.read(bufsize)
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if not data:
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break
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if isinstance(data, str):
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data = data.encode(fp.encoding)
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m.update(data)
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except IOError as msg:
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sys.stderr.write('%s: I/O error: %s\n' % (filename, msg))
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return 1
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out.write('%s %s\n' % (m.hexdigest(), filename))
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return 0
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def main(args = sys.argv[1:], out=sys.stdout):
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global fnfilter, rmode, bufsize
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try:
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opts, args = getopt.getopt(args, 'blts:')
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except getopt.error as msg:
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sys.stderr.write('%s: %s\n%s' % (sys.argv[0], msg, usage))
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return 2
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for o, a in opts:
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if o == '-l':
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fnfilter = os.path.basename
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elif o == '-b':
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rmode = 'rb'
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elif o == '-t':
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rmode = 'r'
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elif o == '-s':
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bufsize = int(a)
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if not args:
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args = ['-']
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return sum(args, out)
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if __name__ == '__main__' or __name__ == sys.argv[0]:
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sys.exit(main(sys.argv[1:], sys.stdout))
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