Re: [dpdk-dev] [PATCH 0/9] python2 deprecation notice

[Robin Jarry <robin.jarry@6wind.com>]

Hi Louise,

2020-07-10, Louise Kilheeney:
> This patchset adds deprecation notices to python scripts,
> warning of the removal of python2 support from the DPDK 20.11 release.

While showing warnings to users about Python 2 support drop in 20.11 is
good, it seems like the shebangs in a lot of these scripts still refer
to "python".

dpdk$ git describe 
v20.05-623-geff30b59cc2e
dpdk$ git grep '#.*!.*python\>'
app/test-bbdev/test-bbdev.py:1:#!/usr/bin/env python
app/test-cmdline/cmdline_test.py:1:#!/usr/bin/env python
app/test/autotest.py:1:#!/usr/bin/env python
buildtools/map_to_win.py:1:#!/usr/bin/env python
config/arm/armv8_machine.py:1:#!/usr/bin/python
devtools/update_version_map_abi.py:1:#!/usr/bin/env python
usertools/cpu_layout.py:1:#!/usr/bin/env python
usertools/dpdk-devbind.py:1:#! /usr/bin/env python
usertools/dpdk-pmdinfo.py:1:#!/usr/bin/env python
usertools/dpdk-telemetry-client.py:1:#! /usr/bin/env python

On many distros, "python" still points (as of today) to python2. You
series will cause warnings that cannot be avoided.

Also, on some distros, "python" does not exist at all (RHEL 8 and CentOS
8 for example). And only "python2" or "python3" are available.

I wonder if it would not be better to find a way to make these shebangs
"dynamic" somehow. It is not trivial and I don't see any other solution
than plain modification of the shebangs at build time.

However, there is no way (to my knowledge) to specify which version of
python is "selected" during the build.

Does anyone have a proper solution?

-- 
Robin