coverage.exceptions.NoSource for temporary files since 4.0.0

[icemac]

Describe the Bug

Updating from version 3.3.1 to 4.0.0 leads to coverage.exceptions.NoSource for temporary Python files created and executed during test runs.

To Reproduce
Steps to reproduce the behavior:

1. Repository: https://github.com/zopefoundation/zope.deprecation
2. The temporary python file is created here: https://github.com/zopefoundation/zope.deprecation/blob/80d6a8f3d8d231af6df69e14bfd1078549f32eff/docs/api.rst?plain=1#L40-L41
3. Running tox -ecoverage followed by coveralls --service=github in GitHub Actions.
4. I get this result:

Submitting coverage to coveralls.io...
Error running coveralls: Got coverage library error: No source for code: '/tmp/tmpr9lzq4ehdeprecation/doctest_ex.py'.
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/reporter.py", line 44, in report
    for (fr, analysis) in get_analysis_to_report(cov, None):
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/report_core.py", line 100, in get_analysis_to_report
    analysis = coverage._analyze(fr)
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/control.py", line 949, in _analyze
    return Analysis(data, self.config.precision, fr, self._file_mapper)
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/results.py", line 35, in __init__
    self.statements = self.file_reporter.lines()
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/python.py", line 193, in lines
    return self.parser.statements
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/python.py", line 184, in parser
    self._parser = PythonParser(
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/parser.py", line [58](https://github.com/zopefoundation/zope.deprecation/actions/runs/9051201049/job/24984861083#step:7:59), in __init__
    self.text = get_python_source(self.filename)
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coverage/python.py", line 63, in get_python_source
    raise NoSource(f"No source for code: '{filename}'.")
coverage.exceptions.NoSource: No source for code: '/tmp/tmpr9lzq4ehdeprecation/doctest_ex.py'.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/cli.py", line 98, in main
    result = coverallz.wear()
  File "/opt/hostedtoolcache/Python/3.9.19/x[64](https://github.com/zopefoundation/zope.deprecation/actions/runs/9051201049/job/24984861083#step:7:65)/lib/python3.9/site-packages/coveralls/api.py", line 272, in wear
    json_string = self.create_report()
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/api.py", line 344, in create_report
    data = self.create_data()
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/api.py", line 403, in create_data
    self._data = {'source_files': self.get_coverage()}
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/api.py", line 425, in get_coverage
    return CoverallReporter(work, base_dir, src_dir).coverage
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/reporter.py", line 32, in __init__
    self.report(cov)
  File "/opt/hostedtoolcache/Python/3.9.19/x64/lib/python3.9/site-packages/coveralls/reporter.py", line 51, in report
    raise CoverallsException(f'Got coverage library error: {e}') from e
coveralls.exception.CoverallsException: Got coverage library error: No source for code: '/tmp/tmpr9lzq4ehdeprecation/doctest_ex.py'.

Expected Behavior
Not existing files should be ignored like in version 3.x

Package Versions

• coveralls [4.0.0], version of last successful run: 3.3.1
• coverage [7.4.4] , version of last successful run: 6.5.0
• Python 3.9

Trace Logs
Provide coverage logs w/ DEBUG logging enabled (run coverage debug ...)

Broken run: https://github.com/zopefoundation/zope.deprecation/actions/runs/9051201049/job/24984861083

Last successful run: https://github.com/zopefoundation/zope.deprecation/actions/runs/8867417029/job/24345951564

[TheKevJames]

This was an intentional breaking change in v4, with the intent being to match coverage-py behaviour. Setting ignore_errors = True in your coverage.py config (docs) should return you to the behaviour you're expecting.

[icemac]

@TheKevJames Thank you for the pointer. Using ignore_errors = True fixed the problem in my end.