tests/md5sum.py

verify: avoid spurious integrity warnings in verbose mode (issue6172)

The issue seems to revolve around renames in filtered commits, and only occurred
in verbose mode.  The problem occurs in the `# check renames` stage, around line
577.  Without using the unfiltered repo, this test would have printed:

    $ hg verify -v
    repository uses revlog format 1
    checking changesets
    checking manifests
    crosschecking files in changesets and manifests
    checking files
     foo@25: checking rename of 71ec0570c325: filtered revision '25'
     foobar@26: checking rename of 1b549296015b: filtered revision '26'
    checked 28 changesets with 16 changes to 11 files
    2 integrity errors encountered!
    (first damaged changeset appears to be 25)
    [1]

Differential Revision: https://phab.mercurial-scm.org/D7950

#!/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.

from __future__ import absolute_import

import hashlib
import os
import sys

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 = hashlib.md5()
    try:
        for data in iter(lambda: fp.read(8192), b''):
            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)