tests/sitecustomize.py

setup: filter out devel-warn messages from system hg

If we're going to use the user's installed and configured hg command
(which we do since 8b20338b989e), we should prevent devel-warn messages
from interfering with locating it.

from __future__ import absolute_import
import os

if os.environ.get('COVERAGE_PROCESS_START'):
    try:
        import coverage
        import uuid

        covpath = os.path.join(os.environ['COVERAGE_DIR'],
                               'cov.%s' % uuid.uuid1())
        cov = coverage.coverage(data_file=covpath, auto_data=True)
        cov._warn_no_data = False
        cov._warn_unimported_source = False
        cov.start()
    except ImportError:
        pass