| #! /usr/bin/env python3 |
| |
| """Python utility to print MD5 checksums of argument files. |
| """ |
| |
| |
| bufsize = 8096 |
| fnfilter = None |
| rmode = 'rb' |
| |
| usage = """ |
| usage: sum5 [-b] [-t] [-l] [-s bufsize] [file ...] |
| -b : read files in binary mode (default) |
| -t : read files in text mode (you almost certainly don't want this!) |
| -l : print last pathname component only |
| -s bufsize: read buffer size (default %d) |
| file ... : files to sum; '-' or no files means stdin |
| """ % bufsize |
| |
| import sys |
| import os |
| import getopt |
| import md5 |
| |
| def sum(*files): |
| sts = 0 |
| if files and isinstance(files[-1], file): |
| out, files = files[-1], files[:-1] |
| else: |
| out = sys.stdout |
| if len(files) == 1 and not isinstance(files[0], str): |
| files = files[0] |
| for f in files: |
| if isinstance(f, str): |
| if f == '-': |
| sts = printsumfp(sys.stdin, '<stdin>', out) or sts |
| else: |
| sts = printsum(f, out) or sts |
| else: |
| sts = sum(f, out) or sts |
| return sts |
| |
| def printsum(filename, out=sys.stdout): |
| try: |
| fp = open(filename, rmode) |
| except IOError as msg: |
| sys.stderr.write('%s: Can\'t open: %s\n' % (filename, msg)) |
| return 1 |
| if fnfilter: |
| filename = fnfilter(filename) |
| sts = printsumfp(fp, filename, out) |
| fp.close() |
| return sts |
| |
| def printsumfp(fp, filename, out=sys.stdout): |
| m = md5.new() |
| try: |
| while 1: |
| data = fp.read(bufsize) |
| if not data: |
| break |
| m.update(data) |
| except IOError as msg: |
| sys.stderr.write('%s: I/O error: %s\n' % (filename, msg)) |
| return 1 |
| out.write('%s %s\n' % (m.hexdigest(), filename)) |
| return 0 |
| |
| def main(args = sys.argv[1:], out=sys.stdout): |
| global fnfilter, rmode, bufsize |
| try: |
| opts, args = getopt.getopt(args, 'blts:') |
| except getopt.error as msg: |
| sys.stderr.write('%s: %s\n%s' % (sys.argv[0], msg, usage)) |
| return 2 |
| for o, a in opts: |
| if o == '-l': |
| fnfilter = os.path.basename |
| elif o == '-b': |
| rmode = 'rb' |
| elif o == '-t': |
| rmode = 'r' |
| elif o == '-s': |
| bufsize = int(a) |
| if not args: |
| args = ['-'] |
| return sum(args, out) |
| |
| if __name__ == '__main__' or __name__ == sys.argv[0]: |
| sys.exit(main(sys.argv[1:], sys.stdout)) |