Ensure source dirs are absolute #681
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This `COV_CORE_SOURCE` environment variable is key for making sure that child processes continue computing code coverage. However, there's no guarantee that child processes start in the same directory as their parent process, which screws up coverage reporting if you're using relative paths for coverage sources. The fix is to make sure we're dealing with absolute paths. This is a little tricky to get right, because sources can include both dirs and packages. This fixes pytest-dev#465
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ionelmc
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Mar 31, 2025
| # Unfortunately, coverage.py doesn't provide a mechanism | ||
| # for unambiguously specifying source_dirs, so we have to detect if a source is | ||
| # a directory or a package by looking in the filesystem: https://github.com/nedbat/coveragepy/issues/1942. | ||
| os.path.abspath(source) # noqa: PTH100 # see note below for why we're using `os.path.abspath` |
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See https://github.com/pytest-dev/pytest-cov/blob/v6.1.0/src/pytest_cov/engine.py#L120-L121. Happy to remove this if it's no longer applicable.
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@ionelmc, are we willing to depend on the newly released coveragepy 7.8.0? It includes a new |
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Yes, why not, try using source_dirs. There will always be older pytest-cov releases for older coveragepy. |
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This
COV_CORE_SOURCEenvironment variable is key for making sure that child processes continue computing code coverage. However, there's no guarantee that child processes start in the same directory as their parent process, which screws up coverage reporting if you're using relative paths for coverage sources. The fix is to make sure we're dealing with absolute paths.This is a little tricky to get right, because sources can include both dirs and packages.
This fixes #465.