Fixes#7007
Python 3.4 is [EOL](https://www.python.org/dev/peps/pep-0429/), and only Python 3.x version available for CentOS 6 through EPEL is this version, and so is used by `certbot-auto`, the only official way to install Certbot on this platform.
This unpleasant situation becomes a little more uncomfortable, considering that the newest `pip` version (19.2) [just dropped Python 3.4 support](https://github.com/pypa/pip/issues/6685) and will refuse to start on this Python version. We can expect a lot of dependencies to follow this path now.
One direct result of this situation is that a fix to support correctly the ARM platforms requires to upgrade `pip` to 19.2 for `certbot-auto`. So this is not possible right now.
Then, let's upgrade Certbot instances on CentOS 6 to a supported version of Python 3.
This PR proposes a new bootstrap approach for CentOS 6 platform, `BootstrapRpmPython3Legacy`, that will install Python 3.6 from [SCL](https://www.softwarecollections.org) (the latest one available for now on CentOS 6). In term of Python 3 specific bootstrap methods, I take the occasion here to completely separate the bootstrap of CentOS 6 as a legacy system, from the RPM-based newest systems (like Fedora 29+) that are simply dropping support for Python 2.x. This is in prevision of future migration for all systems on Python 3.x, that is a different problematic than supporting old systems.
* Add logic
* Rebuilt letsencrypt-auto
* Fix logic
* Focus on specific packages
* Maintain PATH for further invocations of letsencrypt-auto after bootstrap.
* Various corrections
* Fix farm test for RHEL6
* Working centos6 letsencrypt-auto self tests
* Fix test_sdist for CentOS 6
* Corrections
* Work in progress
* Working configuration
* Fix typo
* Remove EPEL. Add a test.
* Update letsencrypt-auto-source/letsencrypt-auto.template
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Improvements after review
* Improvements
* Add a comment
* Add a test
* Update a test
* Corrections
* Update function return
* Work in progress
* Correct behavior on oracle linux 6.
* Corrections
* Rebuild script
* Add letsencrypt-auto tests for oraclelinux6
* Update tox.ini
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto.template
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto.template
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Remove specific code for scientific linux
* Change some variables names
* Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Various corrections
* Fix tests
* Add a comment
* Update message
* Fix test message
* Update letsencrypt-auto-source/letsencrypt-auto.template
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update scripts
* More focused assertion
* Add back a test
* Update script
* Update letsencrypt-auto-source/letsencrypt-auto.template
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Update letsencrypt-auto-source/letsencrypt-auto.template
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* Check quiet mode
* Add changelog
* Update letsencrypt-auto-source/tests/oraclelinux6_tests.sh
Co-Authored-By: Brad Warren <bmw@users.noreply.github.com>
* If there's no python or there's only python2.6 on red hat systems, install python3
* Always check for python2.6
* address style, documentation, nits
* factor out all initialization code
* fix up python version return value when no python installed
* add no python error and exit
* document DeterminePythonVersion parameters
* build letsencrypt-auto
* close brace
* build leauto
* fix syntax errors
* set USE_PYTHON_3 for all cases
* rip out NOCRASH
* replace NOCRASH, update LE_PYTHON set logic
* use built-in venv for py3
* switch to LE_PYTHON not affecting bootstrap selection and not overwriting LE_PYTHON
* python3ify fetch.py
* get fetch.py working with python2 and 3
* don't verify server certificates in fetch.py HttpsGetter
* Use SSLContext and an environment variable so that our tests continue to never verify server certificates.
* typo
* build
* remove commented out code
* address review comments
* add documentation for YES_FLAG and QUIET_FLAG
* Add tests to centos6 Dockerfile to make sure we install python3 if and only if appropriate to do so.
