Deactivate python2

[hgy59]

Motivation: Python 2 is EOL since 01.01.2020 and should be deactivated
Linked issues: #3633

Deactivate all automated builds for Python2 and related packages.

Tasks

• Develop environment: install pip < 21 as pip 21.0 will drop python2 support
• introduce cross/pip2 for python2
• Deactivate CI (github build action) for python2 and related packages

Related Packages

Packages to deactivate or migrate to python3:

• python2
• deluge (deluge 2 upgrade to python 3.10 fix for DSM 7 #4153)
• duplicity (Update duplicity with oauth and Python 3 #3823)
• ffsync (ffsync: update to 1.8.0 #3849 but still python2)
• mercurial (update mercurial to v5.7.1 and python 3.8 #4591)
• octoprint (update octoprint to v1.7.2 and Python38 #4096)
• tvheadend (tvheadend: Remove native/python dependency #4394)

[ymartin59]

Synology delivers a Python 2.7.18 package with DSM 7... so we may port packages for applications without Python 3 support to use Synology version

[hgy59]

Synology delivers a Python 2.7.18 package with DSM 7... so we may port packages for applications without Python 3 support to use Synology version

Sure we may implement such ports for DSM7 but we will still support DSM6 for models not supporting DSM7.
And January 2021 comes fast and will break all python2 packages due to pip >= 21.

[th0ma7]

I'll look into tvheadend. There where recent changes upstream related to python3 (tvheadend/tvheadend#1372) which might be sufficient to cover it all...

[hgy59]

Synology delivers a Python 2.7.18 package with DSM 7... so we may port packages for applications without Python 3 support to use Synology version

Unfortunately the installable Python2 (2.7.18) that comes from Synology for DSM 7 does not contain neigther pip nor virtualenv, so it is not an option to migrate to the synology version of Python2.
But this will only be required for ffsync package (#3849), as all other packages can be migrated to Python 3 (see #4998).

[hgy59]

Closed as not planned.