I observed that the current set of oldest requirements do not correspond to any environment, except the specific Xenial image in Travis CI (and standard Xenial containers will also fail).
It is because the requirements make cryptography and requests fail against standard libraries available in the typical Linux distributions that are targeted by the oldest requirements approach (Centos 6, Centos 7, Xenial, Jessie).
This PR fixes that, by aligning the minimal version requirements of cryptography and requests to the maximal versions that are available on Centos 6. Centos 7, Jessie and Xenial stay unusable with oldest requirements for other reasons, but at least one old and supported Linux distribution is able to run the tests with oldest requirements out of the box.
A test is also corrected to match the expected error message that old versions of urllib3 will raise.
* Remove unneeded sys import.
Once upon a time we needed this in some of these setup.py files because we were
using sys in the file, but we aren't anymore so let's remove the import.
* use setuptools instead of distutils
* Drop support for EOL Python 2.6
* Use more helpful assertIn/NotIn instead of assertTrue/False
* Drop support for EOL Python 3.3
* Remove redundant Python 3.3 code
* Restore code for RHEL 6 and virtualenv for Py2.7
* Revert pipstrap.py to upstream
* Merge py26_packages and non_py26_packages into all_packages
* Revert changes to *-auto in root
* Update by calling letsencrypt-auto-source/build.py
* Revert permissions for pipstrap.py
* Use pipstrap to install a good version of pip
* Use pytest in cb-auto tests
* Remove nose usage in auto_test.py
* remove nose dev dep
* use pytest in test_tests
* Use pytest in tox
* Update dev dependency pinnings
* remove nose multiprocess lines
* Use pytest for coverage
* Use older py and pytest for old python versions
* Add test for Error.__str__
* pin pytest in oldest test
* Fix tests for DNS-DO plugin on py26
* Work around bug for Python 3.3
* Clarify dockerfile comments
* Pin oldest version of packaged python deps
* Install security extras in oldest tests
* Revert "bump requests requirement to >=2.10 (#4248)"
This reverts commit 402ad8b353.
* Use create=True when patching open on module
