run-tests: make code coverage work on Python 3
This code path was obviously not tested on Python 3 because it
blew up in several places due to str/bytes mismatch.
For internal code, we normalize paths to bytes.
For code calling into `coverage`, we normalize paths to str,
which is what `coverage` seems to expect.
After this, `run-tests.py -H` works on Python 3!
Differential Revision: https://phab.mercurial-scm.org/D7133
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