[Trigger CI] Move construction of PythonChroot to PythonTask base class. #1303
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Previously each subtask was creating its own. This commit replaces temporary_pex_builder with temporary_chroot. Isolating PythonChroot creation in just one place will make it easier to transition to python-environment-as-a-subsystem.
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SSIA. The user facing parts of this change:
- package resolution happens via requests now -- this is way more reliable
and results in fewer Untranslateable exceptions
- PEX_VERBOSE now controls all pex verbosity, including better messages around Untranslateable (yay!)
- fixes a major pex regression with namespace packages introduced somewhere in 0.5.x
The pex 0.7.0 -> 0.8.0 changelog:
* *API change*: Decouple translation from package iteration. This removes
the Obtainer construct entirely, which likely means if you're using PEX as
a library, you will need to change your code if you were doing anything
nontrivial. This adds a couple new options to ``resolve`` but simplifies
the story around how to cache packages.
[RB pantsbuild#785](https://rbcommons.com/s/twitter/r/785/)
* Refactor http handling in pex to allow for alternate http implementations. Adds support
for [requests](https://github.com/kennethreitz/requests),
improving both performance and security. For more information, read the commit notes at
[91c7f32](pex-tool/pex@91c7f32).
[RB pantsbuild#778](https://rbcommons.com/s/twitter/r/778/)
* Improvements to API documentation throughout.
* Renamed ``Tracer`` to ``TraceLogger`` to prevent nondeterministic isort ordering.
* Refactor tox.ini to increase the number of environment combinations and improve coverage.
* Adds HTTP retry support for the RequestsContext.
[RB pantsbuild#1303](https://rbcommons.com/s/twitter/r/1303/)
* Make pex --version correct.
[Issue #19](pex-tool/pex#19)
* Bug fix: Fix over-aggressive sys.modules scrubbing for namespace packages. Under
certain circumstances, namespace packages in site-packages could conflict with packages
within a PEX, causing them to fail importing.
[RB pantsbuild#1378](https://rbcommons.com/s/twitter/r/1378/)
* Bug fix: Replace uses of ``os.unsetenv(...)`` with ``del os.environ[...]``
[Pull Request #11](pex-tool/pex#11)
* Bug fix: Scrub sys.path and sys.modules based upon both supplied path and
realpath of files and directories. Newer versions of virtualenv on Linux symlink site-packages
which caused those packages to not be removed from sys.path correctly.
[Issue #21](pex-tool/pex#21)
* Bug fix: The pex -s option was not correctly pulling in transitive dependencies.
[Issue #22](pex-tool/pex#22)
* Bug fix: Adds ``content`` method to HTTP contexts that does HTML content decoding, fixing
an encoding issue only experienced when using Python 3.
[Issue #10](pex-tool/pex#10)
Testing Done:
build-support/bin/ci.sh
Reviewed at https://rbcommons.com/s/twitter/r/1421/
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Previously each subtask was creating its own.
This commit replaces temporary_pex_builder with temporary_chroot.
Isolating PythonChroot creation in just one place will make it easier
to transition to python-environment-as-a-subsystem.