tests/md5sum.py

tests: tolerate differences between Linux and Windows error strings

These are related to differences in how missing files and network connection
failures are displayed.  I opted to combine the strings in one line instead of
using '#if windows' blocks around entire commands in order to avoid future
changes being accidentally missed in the Windows sections.  Globbing away the
entire output seemed wrong, as it could mask other failures.

The raw messages involved are:

      Linux                               Windows

  "* not known"               <-> "getaddrinfo failed"
  "Connection refused"        <-> "No connection could be made because the
                                   target machine actively refused it"
  "No such file or directory" <-> "The system cannot find the file specified"

Issue 4941 indicates that NetBSD has yet another string for "* not known".

Also, the histedit test shows that the missing file is printed first on Windows,
last on Linux.  That is controlled in windows.py:posixfile if we care to change
it.

#!/usr/bin/env python
#
# Based on python's Tools/scripts/md5sum.py
#
# This software may be used and distributed according to the terms
# of the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2, which is
# GPL-compatible.

import sys, os

try:
    from hashlib import md5
except ImportError:
    from md5 import md5

try:
    import msvcrt
    msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
    msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
except ImportError:
    pass

for filename in sys.argv[1:]:
    try:
        fp = open(filename, 'rb')
    except IOError as msg:
        sys.stderr.write('%s: Can\'t open: %s\n' % (filename, msg))
        sys.exit(1)

    m = md5()
    try:
        while True:
            data = fp.read(8192)
            if not data:
                break
            m.update(data)
    except IOError as msg:
        sys.stderr.write('%s: I/O error: %s\n' % (filename, msg))
        sys.exit(1)
    sys.stdout.write('%s  %s\n' % (m.hexdigest(), filename))

sys.exit(0)