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#! /usr/bin/env python3
"""Python utility to print MD5 checksums of argument files.
"""
bufsize = 8096
fnfilter = None
rmode = 'rb'
usage = """
usage: md5sum.py [-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 io
import sys
import os
import getopt
from hashlib import md5
def sum(*files):
sts = 0
if files and isinstance(files[-1], io.IOBase):
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
with fp:
if fnfilter:
filename = fnfilter(filename)
sts = printsumfp(fp, filename, out)
return sts
def printsumfp(fp, filename, out=sys.stdout):
m = md5()
try:
while 1:
data = fp.read(bufsize)
if not data:
break
if isinstance(data, str):
data = data.encode(fp.encoding)
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))
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