mercurial/utils/hashutil.py

branchcache: gather newly closed head in a dedicated set

This is part of a series to more clearly split the update in two step. This
will allow us to introduce a fast path during update in a future changeset.

import hashlib

try:
    from ..thirdparty import sha1dc  # pytype: disable=import-error

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