view mercurial/utils/hashutil.py @ 46626:ee91966aec0f

requirements: add constant for revlog v1 requirement

Since this series is adding a new requirement, we might as well clean up while
we're here.

Differential Revision: https://phab.mercurial-scm.org/D10105

from __future__ import absolute_import

import hashlib

try:
    from ..thirdparty import sha1dc

    sha1 = sha1dc.sha1
except (ImportError, AttributeError):
    sha1 = hashlib.sha1