Add a requires_dists function.
#1122
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This is needed to support pex-tool#1020 and pex-tool#1108.
| pkg_info = _parse_pkg_info(dist) | ||
| if pkg_info is None: | ||
| return |
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Unsure of the error handling strategy in here, but is a dist not having PKG-INFO something that should be silently ignored like this?
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I think so, yes. If the distribution has no metadata, that means it expresses no opinon on a Python interpreter requirement, which is all we care about (it can have metadata and not an express an opinion on this field as tests exercise). It is true that distributions should always have metadata and that if they do not, a minimal file should be produced by Pip when it installs the distribution, but there is a range of interesting non-compliant package material out on PyPI and banking on Pip to fill in minimal metadata for those seems like a bet we don't need to make.
This is needed to support #1020 and #1108.