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Co-authored-by: Sam Thursfield <sam.thursfield@codethink.co.uk>
Since upstream pip do not want to merge https://github.com/pypa/pip/pull/2371
we should avoid depending on this pull request.
To find runtime dependencies we now run pip install inside a virtual env
then run pip freeze to obtain the dependency set, this has the advantage
that nearly all the work is being done by pip.
Originally the python extensions were designed to look for upstream git
repos, in practice this is unreliable and won't be compatible with obtaining
dependencies using pip install, so the downside of this approach is that
all lorries will be tarballs, the upshot is that we can now automatically
import many packages that we couldn't import before.
Another upshot of this approach is that we may be able to consider the
removal of a lot of the spec processing and validation code if we're willing
to worry less about build dependencies, we're not sure whether we should
be willing to worry less about build dependencies though.
We've had encouraging results using this patch so far, we are now able
to import, without user intervention, packages that failed previously,
such as boto, persistent-pineapple, jmespath, coverage, requests also
almost imported successfully but appears to require a release of pytest
that is uploaded as a zip.
Change-Id: I705c6f6bd722df041d17630287382f851008e97a
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