Improve pip/setuptools/wheel installation#1007

Merged

edmorley merged 11 commits intomasterfrom

update-pip-setuptools-wheel

Jul 29, 2020

Commits on Jul 29, 2020

Output the installed version of pip in the build log (#1007)
edmorley
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Move Pip version handling to bin/steps/python (#1007)
edmorley
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Output the installed version of setuptools in the build log (#1007)
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Install setuptools from PyPI rather than a vendored copy (#1007)
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Install pip and setuptools in the same pip invocation (#1007)
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Install an explicit version of wheel rather than latest (#1007)
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Remove redundant site-packages cleanup steps (#1007)
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Always check/adjust the installed versions of setuptools/wheel (#1007)
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Install pip using itself rather than `get-pip.py` (#1007)
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Disable pip's version check + cache when installing pip/setuptools/wheel (#1007)
edmorley
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Correctly handle failed pip/setuptools/wheel installs (#1007)
edmorley
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