diff options
Diffstat (limited to 'coverage/control.py')
| -rw-r--r-- | coverage/control.py | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/coverage/control.py b/coverage/control.py index f422d7c..81653d3 100644 --- a/coverage/control.py +++ b/coverage/control.py @@ -1062,11 +1062,30 @@ def process_startup(): """ cps = os.environ.get("COVERAGE_PROCESS_START") - if cps: - cov = Coverage(config_file=cps, auto_data=True) - cov.start() - cov._warn_no_data = False - cov._warn_unimported_source = False + if not cps: + # No request for coverage, nothing to do. + return + + # This function can be called more than once in a process. This happens + # because some virtualenv configurations make the same directory visible + # twice in sys.path. This means that the .pth file will be found twice, + # and executed twice, executing this function twice. We set a global + # flag (an attribute on this function) to indicate that coverage has + # already been started, so we can avoid doing it twice. + # + # https://bitbucket.org/ned/coveragepy/issue/340/keyerror-subpy has more + # details. + + if hasattr(process_startup, "done"): + # We've annotated this function before, so we must have already + # started coverage in this process. Nothing to do. + return + + process_startup.done = True + cov = Coverage(config_file=cps, auto_data=True) + cov.start() + cov._warn_no_data = False + cov._warn_unimported_source = False # A hack for debugging testing in sub-processes. |